initial commit

Signed-off-by: ale <ale@manalejandro.com>

.gitignore

@@ -0,0 +1,27 @@
+target/
+Cargo.lock
+*.swp
+*.swo
+*~
+.DS_Store
+*.orig
+*.rej
+
+# Kernel build artifacts
+*.o
+*.ko
+*.mod.c
+modules.order
+Module.symvers
+.tmp_versions/
+
+# Documentation
+doc/
+
+# IDE files
+.vscode/
+.idea/
+*.iml
+
+# OS files
+Thumbs.db

ARCHITECTURE.md

@@ -0,0 +1,125 @@
+# Rust Kernel Architecture
+
+## Project Structure
+
+This Rust kernel project is organized as follows:
+
+```
+rust/
+├── README.md           # Project overview and build instructions
+├── Cargo.toml          # Root workspace configuration
+├── Makefile           # Build automation
+├── src/
+│   └── lib.rs         # Top-level kernel library
+├── kernel/            # Core kernel crate
+│   ├── Cargo.toml
+│   └── src/
+│       ├── lib.rs     # Main kernel library
+│       ├── prelude.rs # Common imports and macros
+│       ├── error.rs   # Error handling
+│       ├── types.rs   # Kernel data types
+│       ├── memory/    # Memory management
+│       ├── sync.rs    # Synchronization primitives
+│       ├── process.rs # Process management
+│       ├── scheduler.rs # Task scheduling
+│       ├── device.rs  # Device management
+│       ├── driver.rs  # Driver framework
+│       ├── interrupt.rs # Interrupt handling
+│       ├── console.rs # Console/logging
+│       ├── module.rs  # Module system
+│       ├── init.rs    # Initialization
+│       ├── panic.rs   # Panic handler
+│       └── arch/      # Architecture-specific code
+├── modules/           # Loadable kernel modules
+│   ├── Cargo.toml
+│   └── src/
+│       ├── hello.rs   # Hello world module
+│       └── test.rs    # Test module
+├── drivers/           # Device drivers
+│   ├── Cargo.toml
+│   └── src/
+│       └── dummy.rs   # Example dummy driver
+└── test.sh           # Build and test script
+```
+
+## Design Philosophy
+
+This kernel is designed with the following principles:
+
+1. **Memory Safety**: Leveraging Rust's ownership system to prevent memory bugs
+2. **Zero-Cost Abstractions**: High-level APIs without runtime overhead
+3. **Modularity**: Clean separation between subsystems
+4. **Linux Compatibility**: Similar APIs and concepts where applicable
+5. **Modern Design**: Taking advantage of modern language features
+
+## Key Components
+
+### Core Kernel (`kernel/`)
+
+- **Memory Management**: Page allocation, heap management, virtual memory
+- **Process Management**: Process and thread abstractions
+- **Synchronization**: Spinlocks, mutexes, and other primitives
+- **Device Framework**: Generic device and driver abstractions
+- **Module System**: Support for loadable kernel modules
+- **Error Handling**: Comprehensive error types and Result-based APIs
+
+### Modules (`modules/`)
+
+Loadable kernel modules that can extend kernel functionality:
+- `hello.rs`: Simple demonstration module
+- `test.rs`: Testing and validation module
+
+### Drivers (`drivers/`)
+
+Device drivers implementing the kernel driver framework:
+- `dummy.rs`: Example driver showing the driver API
+
+## Architecture Support
+
+Currently includes basic support for:
+- x86_64 (primary target)
+- ARM64 (stub)
+- RISC-V (stub)
+
+## Building and Testing
+
+```bash
+# Build everything
+make
+
+# Run tests
+make test
+
+# Check code quality
+make clippy fmt-check
+
+# Run the automated test script
+./test.sh
+```
+
+## Development Status
+
+This is a foundational implementation demonstrating:
+- ✅ Basic kernel structure and organization
+- ✅ Memory management framework
+- ✅ Module system with examples
+- ✅ Driver framework
+- ✅ Synchronization primitives
+- ✅ Error handling
+- ✅ Build system integration
+
+Areas for future development:
+- [ ] Complete memory management implementation
+- [ ] Interrupt handling and timers
+- [ ] Full scheduler implementation
+- [ ] File system support
+- [ ] Network stack
+- [ ] Hardware abstraction layers
+- [ ] Boot loader integration
+- [ ] Performance optimization
+
+## Relationship to Linux Kernel
+
+This project is inspired by the Linux kernel's Rust infrastructure (`/linux/rust/`) but is designed as a standalone kernel implementation. It demonstrates how modern Rust can be used for systems programming while maintaining the familiar concepts from traditional kernel development.
+
+The module system and driver framework are designed to be conceptually similar to Linux while taking advantage of Rust's type system for additional safety guarantees.

Cargo.toml

@@ -0,0 +1,48 @@
+[package]
+name = "rust-kernel"
+version = "0.1.0"
+edition = "2021"
+authors = ["Rust Kernel Contributors"]
+description = "A Rust-based kernel inspired by Linux"
+license = "GPL-2.0"
+
+[workspace]
+members = [
+    "kernel",
+    "drivers",
+    "modules",
+    "arch",
+    "mm",
+    "fs",
+    "net",
+    "security"
+]
+
+[workspace.dependencies]
+kernel = { path = "kernel" }
+
+[lib]
+name = "rust_kernel"
+crate-type = ["staticlib", "cdylib"]
+
+[features]
+default = ["alloc", "std"]
+alloc = []
+std = []
+no_std = []
+
+[profile.dev]
+panic = "abort"
+opt-level = 0
+debug = true
+
+[profile.release]
+panic = "abort"
+opt-level = "s"  # Optimize for size
+debug = false
+lto = true
+codegen-units = 1
+
+[target.'cfg(target_arch = "x86_64")']
+[target.'cfg(target_arch = "aarch64")']
+[target.'cfg(target_arch = "riscv64")']

Makefile

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+# SPDX-License-Identifier: GPL-2.0
+
+# Rust Kernel Makefile
+# Based on Linux kernel Rust infrastructure
+
+RUST_KERNEL_VERSION := 0.1.0
+
+# Build configuration
+ARCH ?= x86_64
+BUILD_TYPE ?= release
+
+# Cargo configuration
+CARGO := cargo
+CARGO_FLAGS := --target-dir target
+
+ifeq ($(BUILD_TYPE),debug)
+    CARGO_FLAGS += 
+else
+    CARGO_FLAGS += --release
+endif
+
+# Kernel modules
+RUST_MODULES := $(shell find modules -name "*.rs" -type f)
+DRIVERS := $(shell find drivers -name "*.rs" -type f)
+
+# Default target
+all: kernel modules drivers
+
+# Build the core kernel
+kernel:
+	@echo "Building Rust kernel ($(ARCH), $(BUILD_TYPE))"
+	$(CARGO) build $(CARGO_FLAGS)
+
+# Build kernel modules
+modules: $(RUST_MODULES)
+	@echo "Building kernel modules"
+	cd modules && $(CARGO) build $(CARGO_FLAGS)
+
+# Build drivers
+drivers: $(DRIVERS)
+	@echo "Building drivers"
+	cd drivers && $(CARGO) build $(CARGO_FLAGS)
+
+# Clean build artifacts
+clean:
+	$(CARGO) clean
+	rm -rf target/
+
+# Run tests
+test:
+	$(CARGO) test $(CARGO_FLAGS)
+
+# Check formatting
+fmt-check:
+	$(CARGO) fmt --check
+
+# Format code
+fmt:
+	$(CARGO) fmt
+
+# Run clippy
+clippy:
+	$(CARGO) clippy $(CARGO_FLAGS) -- -D warnings
+
+# Generate documentation
+doc:
+	$(CARGO) doc $(CARGO_FLAGS) --no-deps
+
+# Install (placeholder)
+install:
+	@echo "Install target not implemented yet"
+
+.PHONY: all kernel modules drivers clean test fmt-check fmt clippy doc install

README.md

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+# Rust Kernel
+
+A Rust-based kernel inspired by the Linux kernel, utilizing the Rust for Linux infrastructure.
+
+## Overview
+
+This project aims to create a modern kernel implementation in Rust, leveraging memory safety and performance benefits while maintaining compatibility with Linux kernel concepts and APIs.
+
+## Architecture
+
+- **kernel/**: Core kernel functionality and APIs
+- **drivers/**: Device drivers written in Rust
+- **modules/**: Loadable kernel modules
+- **arch/**: Architecture-specific code
+- **mm/**: Memory management
+- **fs/**: File system implementations
+- **net/**: Network stack
+- **security/**: Security subsystem
+
+## Building
+
+```bash
+# Build the kernel
+cargo build --release
+
+# Run tests
+cargo test
+
+# Check code formatting
+cargo fmt --check
+
+# Run clippy lints
+cargo clippy -- -D warnings
+```
+
+## Features
+
+- Memory-safe kernel implementation
+- Zero-cost abstractions
+- Modern async/await support for I/O operations
+- Modular architecture
+- Linux-compatible APIs where possible
+
+## License
+
+This project is licensed under GPL-2.0, following the Linux kernel license.
+
+## Contributing
+
+Contributions are welcome! Please follow the Linux kernel coding style and Rust conventions.

clippy.toml

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+# Clippy configuration for kernel development
+warn = [
+    "clippy::all",
+    "clippy::pedantic",
+    "clippy::nursery",
+    "clippy::cargo"
+]
+
+allow = [
+    "clippy::missing_errors_doc",
+    "clippy::missing_panics_doc", 
+    "clippy::module_name_repetitions",
+    "clippy::inline_always",
+    "clippy::must_use_candidate",
+    "clippy::cast_possible_truncation",
+    "clippy::cast_sign_loss",
+    "clippy::cast_possible_wrap",
+    "clippy::similar_names",
+    "clippy::too_many_lines",
+    "clippy::unused_self"
+]

drivers/Cargo.toml

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+[package]
+name = "drivers"
+version = "0.1.0"
+edition = "2021"
+authors = ["Rust Kernel Contributors"]
+description = "Kernel drivers"
+license = "GPL-2.0"
+
+[dependencies]
+kernel = { path = "../kernel" }
+
+[[bin]]
+name = "dummy_driver"
+path = "src/dummy.rs"
+
+[[bin]]
+name = "mem_devices"
+path = "src/mem.rs"
+
+[[bin]]
+name = "platform_example"
+path = "src/platform_example.rs"
+
+[[bin]]
+name = "ramdisk"
+path = "src/ramdisk.rs"

drivers/src/dummy.rs

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+// SPDX-License-Identifier: GPL-2.0
+
+//! Dummy device driver
+
+#![no_std]
+#![no_main]
+
+use kernel::prelude::*;
+use kernel::driver::{Driver, DriverOps};
+use kernel::device::{Device, DeviceType};
+
+struct DummyDriver {
+    name: &'static str,
+}
+
+impl DummyDriver {
+    fn new() -> Self {
+        Self {
+            name: "dummy_driver",
+        }
+    }
+}
+
+impl Driver for DummyDriver {
+    fn name(&self) -> &str {
+        self.name
+    }
+    
+    fn probe(&self, device: &mut Device) -> Result<()> {
+        info!("DummyDriver: probing device {}", device.name);
+        Ok(())
+    }
+    
+    fn remove(&self, device: &mut Device) -> Result<()> {
+        info!("DummyDriver: removing device {}", device.name);
+        Ok(())
+    }
+}
+
+impl DriverOps for DummyDriver {
+    fn read(&self, offset: u64, buffer: &mut [u8]) -> Result<usize> {
+        info!("DummyDriver: read at offset {} for {} bytes", offset, buffer.len());
+        // Fill buffer with dummy data
+        for (i, byte) in buffer.iter_mut().enumerate() {
+            *byte = (i % 256) as u8;
+        }
+        Ok(buffer.len())
+    }
+    
+    fn write(&self, offset: u64, buffer: &[u8]) -> Result<usize> {
+        info!("DummyDriver: write at offset {} for {} bytes", offset, buffer.len());
+        Ok(buffer.len())
+    }
+    
+    fn ioctl(&self, cmd: u32, arg: usize) -> Result<usize> {
+        info!("DummyDriver: ioctl cmd={}, arg={}", cmd, arg);
+        Ok(0)
+    }
+}
+
+struct DummyModule {
+    driver: DummyDriver,
+}
+
+impl kernel::module::Module for DummyModule {
+    fn init(_module: &'static kernel::module::ThisModule) -> Result<Self> {
+        info!("Dummy driver module initializing...");
+        
+        let driver = DummyDriver::new();
+        
+        // Register the driver
+        kernel::driver::register_driver(Box::new(driver))?;
+        
+        info!("Dummy driver registered successfully");
+        
+        Ok(DummyModule {
+            driver: DummyDriver::new(),
+        })
+    }
+    
+    fn exit(_module: &'static kernel::module::ThisModule) {
+        info!("Dummy driver module exiting");
+        // Unregister driver
+        kernel::driver::unregister_driver("dummy_driver").ok();
+    }
+}
+
+module! {
+    type: DummyModule,
+    name: "dummy_driver",
+    author: "Rust Kernel Contributors", 
+    description: "A dummy device driver for testing",
+    license: "GPL-2.0",
+}

drivers/src/mem.rs

@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Null, zero, and full device drivers
+//! Based on Linux drivers/char/mem.c
+
+#![no_std]
+#![no_main]
+
+use kernel::prelude::*;
+use kernel::device::{CharDevice, FileOperations, Inode, File, VMA};
+use kernel::driver::CharDriverOps;
+
+/// Null device driver (/dev/null)
+struct NullDevice;
+
+impl FileOperations for NullDevice {
+    fn open(&self, _inode: &Inode, _file: &mut File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, _inode: &Inode, _file: &mut File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn read(&self, _file: &mut File, _buf: &mut [u8], _offset: u64) -> Result<usize> {
+        // Reading from /dev/null always returns EOF
+        Ok(0)
+    }
+    
+    fn write(&self, _file: &mut File, buf: &[u8], _offset: u64) -> Result<usize> {
+        // Writing to /dev/null always succeeds and discards data
+        Ok(buf.len())
+    }
+    
+    fn ioctl(&self, _file: &mut File, _cmd: u32, _arg: usize) -> Result<usize> {
+        Err(Error::NotSupported)
+    }
+    
+    fn mmap(&self, _file: &mut File, _vma: &mut VMA) -> Result<()> {
+        Err(Error::NotSupported)
+    }
+}
+
+/// Zero device driver (/dev/zero)
+struct ZeroDevice;
+
+impl FileOperations for ZeroDevice {
+    fn open(&self, _inode: &Inode, _file: &mut File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, _inode: &Inode, _file: &mut File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn read(&self, _file: &mut File, buf: &mut [u8], _offset: u64) -> Result<usize> {
+        // Reading from /dev/zero returns zeros
+        for byte in buf.iter_mut() {
+            *byte = 0;
+        }
+        Ok(buf.len())
+    }
+    
+    fn write(&self, _file: &mut File, buf: &[u8], _offset: u64) -> Result<usize> {
+        // Writing to /dev/zero always succeeds and discards data
+        Ok(buf.len())
+    }
+    
+    fn ioctl(&self, _file: &mut File, _cmd: u32, _arg: usize) -> Result<usize> {
+        Err(Error::NotSupported)
+    }
+    
+    fn mmap(&self, _file: &mut File, vma: &mut VMA) -> Result<()> {
+        // /dev/zero can be mmap'd to get zero-filled pages
+        // TODO: implement proper mmap support
+        Ok(())
+    }
+}
+
+/// Full device driver (/dev/full) 
+struct FullDevice;
+
+impl FileOperations for FullDevice {
+    fn open(&self, _inode: &Inode, _file: &mut File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, _inode: &Inode, _file: &mut File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn read(&self, _file: &mut File, buf: &mut [u8], _offset: u64) -> Result<usize> {
+        // Reading from /dev/full returns zeros
+        for byte in buf.iter_mut() {
+            *byte = 0;
+        }
+        Ok(buf.len())
+    }
+    
+    fn write(&self, _file: &mut File, _buf: &[u8], _offset: u64) -> Result<usize> {
+        // Writing to /dev/full always fails with "no space left"
+        Err(Error::OutOfMemory) // ENOSPC equivalent
+    }
+    
+    fn ioctl(&self, _file: &mut File, _cmd: u32, _arg: usize) -> Result<usize> {
+        Err(Error::NotSupported)
+    }
+    
+    fn mmap(&self, _file: &mut File, _vma: &mut VMA) -> Result<()> {
+        Err(Error::NotSupported)
+    }
+}
+
+/// Memory devices module
+struct MemoryDevicesModule {
+    null_major: u32,
+    zero_major: u32,
+    full_major: u32,
+}
+
+impl kernel::module::Module for MemoryDevicesModule {
+    fn init(_module: &'static kernel::module::ThisModule) -> Result<Self> {
+        info!("Memory devices module initializing...");
+        
+        // Register /dev/null (major 1, minor 3)
+        let null_major = kernel::device::register_chrdev(
+            1,
+            String::from("null"),
+            Box::new(NullDevice)
+        )?;
+        
+        // Register /dev/zero (major 1, minor 5) 
+        let zero_major = kernel::device::register_chrdev(
+            1,
+            String::from("zero"),
+            Box::new(ZeroDevice)
+        )?;
+        
+        // Register /dev/full (major 1, minor 7)
+        let full_major = kernel::device::register_chrdev(
+            1,
+            String::from("full"),
+            Box::new(FullDevice)
+        )?;
+        
+        info!("Memory devices registered: null={}, zero={}, full={}", 
+              null_major, zero_major, full_major);
+        
+        Ok(MemoryDevicesModule {
+            null_major,
+            zero_major,
+            full_major,
+        })
+    }
+    
+    fn exit(_module: &'static kernel::module::ThisModule) {
+        info!("Memory devices module exiting");
+        
+        // Unregister character devices
+        kernel::device::unregister_chrdev(1).ok();
+    }
+}
+
+module! {
+    type: MemoryDevicesModule,
+    name: "mem_devices",
+    author: "Rust Kernel Contributors",
+    description: "Memory devices (/dev/null, /dev/zero, /dev/full)",
+    license: "GPL-2.0",
+}

drivers/src/platform_example.rs

@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Platform device driver example
+
+#![no_std]
+#![no_main]
+
+use kernel::prelude::*;
+use kernel::driver::{PlatformDriver, Driver, DeviceId};
+use kernel::device::Device;
+
+/// Example platform driver
+struct ExamplePlatformDriver {
+    name: &'static str,
+    device_ids: &'static [DeviceId],
+}
+
+impl ExamplePlatformDriver {
+    fn new() -> Self {
+        Self {
+            name: "example_platform",
+            device_ids: &[
+                DeviceId::new(String::from("example,platform-device"))
+                    .with_compatible(vec![
+                        String::from("example,platform-device"),
+                        String::from("generic,platform-device"),
+                    ]),
+            ],
+        }
+    }
+}
+
+impl Driver for ExamplePlatformDriver {
+    fn name(&self) -> &str {
+        self.name
+    }
+    
+    fn probe(&self, device: &mut Device) -> Result<()> {
+        info!("Platform driver probing device: {}", device.name());
+        
+        // Initialize device-specific data
+        device.set_private_data(ExampleDeviceData {
+            initialized: true,
+            counter: 0,
+        });
+        
+        info!("Platform device {} probed successfully", device.name());
+        Ok(())
+    }
+    
+    fn remove(&self, device: &mut Device) -> Result<()> {
+        info!("Platform driver removing device: {}", device.name());
+        
+        if let Some(data) = device.get_private_data::<ExampleDeviceData>() {
+            info!("Device had counter value: {}", data.counter);
+        }
+        
+        Ok(())
+    }
+    
+    fn suspend(&self, device: &mut Device) -> Result<()> {
+        info!("Platform device {} suspending", device.name());
+        Ok(())
+    }
+    
+    fn resume(&self, device: &mut Device) -> Result<()> {
+        info!("Platform device {} resuming", device.name());
+        Ok(())
+    }
+    
+    fn shutdown(&self, device: &mut Device) {
+        info!("Platform device {} shutting down", device.name());
+    }
+}
+
+impl PlatformDriver for ExamplePlatformDriver {
+    fn match_device(&self, device: &Device) -> bool {
+        // Simple name-based matching
+        device.name().contains("example") || device.name().contains("platform")
+    }
+    
+    fn device_ids(&self) -> &[DeviceId] {
+        self.device_ids
+    }
+}
+
+/// Device-specific private data
+#[derive(Debug)]
+struct ExampleDeviceData {
+    initialized: bool,
+    counter: u32,
+}
+
+/// Platform driver module
+struct PlatformDriverModule {
+    driver: ExamplePlatformDriver,
+}
+
+impl kernel::module::Module for PlatformDriverModule {
+    fn init(_module: &'static kernel::module::ThisModule) -> Result<Self> {
+        info!("Platform driver module initializing...");
+        
+        let driver = ExamplePlatformDriver::new();
+        
+        // Register the platform driver
+        kernel::driver::register_platform_driver(Box::new(driver))?;
+        
+        info!("Platform driver registered successfully");
+        
+        Ok(PlatformDriverModule {
+            driver: ExamplePlatformDriver::new(),
+        })
+    }
+    
+    fn exit(_module: &'static kernel::module::ThisModule) {
+        info!("Platform driver module exiting");
+        kernel::driver::unregister_driver("example_platform").ok();
+    }
+}
+
+module! {
+    type: PlatformDriverModule,
+    name: "example_platform_driver",
+    author: "Rust Kernel Contributors",
+    description: "Example platform device driver",
+    license: "GPL-2.0",
+}

drivers/src/ramdisk.rs

@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! RAM disk block device driver
+//! Based on Linux drivers/block/brd.c
+
+#![no_std]
+#![no_main]
+
+use kernel::prelude::*;
+use kernel::driver::{Driver, BlockDriverOps};
+use kernel::device::{Device, BlockDevice, DeviceType};
+use kernel::memory::{AllocFlags, GFP_KERNEL};
+
+/// RAM disk device
+struct RamDisk {
+    size: u64,      // Size in bytes
+    block_size: u32, // Block size in bytes
+    data: Vec<u8>,   // Actual storage
+}
+
+impl RamDisk {
+    fn new(size: u64, block_size: u32) -> Result<Self> {
+        let mut data = Vec::new();
+        data.try_reserve(size as usize)?;
+        data.resize(size as usize, 0);
+        
+        Ok(Self {
+            size,
+            block_size,
+            data,
+        })
+    }
+    
+    fn get_block_count(&self) -> u64 {
+        self.size / self.block_size as u64
+    }
+}
+
+impl BlockDriverOps for RamDisk {
+    fn read_block(&self, block: u64, buffer: &mut [u8]) -> Result<usize> {
+        if block >= self.get_block_count() {
+            return Err(Error::InvalidArgument);
+        }
+        
+        let offset = (block * self.block_size as u64) as usize;
+        let size = core::cmp::min(buffer.len(), self.block_size as usize);
+        
+        if offset + size > self.data.len() {
+            return Err(Error::InvalidArgument);
+        }
+        
+        buffer[..size].copy_from_slice(&self.data[offset..offset + size]);
+        Ok(size)
+    }
+    
+    fn write_block(&self, block: u64, buffer: &[u8]) -> Result<usize> {
+        if block >= self.get_block_count() {
+            return Err(Error::InvalidArgument);
+        }
+        
+        let offset = (block * self.block_size as u64) as usize;
+        let size = core::cmp::min(buffer.len(), self.block_size as usize);
+        
+        if offset + size > self.data.len() {
+            return Err(Error::InvalidArgument);
+        }
+        
+        // This is a bit unsafe due to the immutable reference, but for simplicity...
+        // In a real implementation, we'd use proper interior mutability
+        unsafe {
+            let data_ptr = self.data.as_ptr() as *mut u8;
+            let dest = core::slice::from_raw_parts_mut(data_ptr.add(offset), size);
+            dest.copy_from_slice(&buffer[..size]);
+        }
+        
+        Ok(size)
+    }
+    
+    fn get_block_size(&self) -> u32 {
+        self.block_size
+    }
+    
+    fn get_total_blocks(&self) -> u64 {
+        self.get_block_count()
+    }
+    
+    fn flush(&self) -> Result<()> {
+        // RAM disk doesn't need flushing
+        Ok(())
+    }
+}
+
+/// RAM disk driver
+struct RamDiskDriver {
+    name: &'static str,
+}
+
+impl RamDiskDriver {
+    fn new() -> Self {
+        Self {
+            name: "ramdisk",
+        }
+    }
+}
+
+impl Driver for RamDiskDriver {
+    fn name(&self) -> &str {
+        self.name
+    }
+    
+    fn probe(&self, device: &mut Device) -> Result<()> {
+        info!("RAM disk driver probing device: {}", device.name());
+        
+        // Create a 16MB RAM disk with 4KB blocks
+        let ramdisk = RamDisk::new(16 * 1024 * 1024, 4096)?;
+        
+        info!("Created RAM disk: {} blocks of {} bytes each", 
+              ramdisk.get_total_blocks(), ramdisk.get_block_size());
+        
+        device.set_private_data(ramdisk);
+        
+        Ok(())
+    }
+    
+    fn remove(&self, device: &mut Device) -> Result<()> {
+        info!("RAM disk driver removing device: {}", device.name());
+        Ok(())
+    }
+}
+
+/// RAM disk module
+struct RamDiskModule {
+    driver: RamDiskDriver,
+    device_created: bool,
+}
+
+impl kernel::module::Module for RamDiskModule {
+    fn init(_module: &'static kernel::module::ThisModule) -> Result<Self> {
+        info!("RAM disk module initializing...");
+        
+        let driver = RamDiskDriver::new();
+        
+        // Register the driver
+        kernel::driver::register_driver(Box::new(driver))?;
+        
+        // Create a RAM disk device
+        let mut device = Device::new(
+            String::from("ram0"),
+            DeviceType::Block,
+            1,  // major number for RAM disk
+            0   // minor number
+        );
+        
+        // Set up the driver for this device
+        let ramdisk_driver = RamDiskDriver::new();
+        device.set_driver(Box::new(ramdisk_driver))?;
+        
+        // Register the device
+        kernel::device::register_device(device)?;
+        
+        info!("RAM disk device created and registered");
+        
+        Ok(RamDiskModule {
+            driver: RamDiskDriver::new(),
+            device_created: true,
+        })
+    }
+    
+    fn exit(_module: &'static kernel::module::ThisModule) {
+        info!("RAM disk module exiting");
+        
+        if self.device_created {
+            kernel::device::unregister_device("ram0").ok();
+        }
+        
+        kernel::driver::unregister_driver("ramdisk").ok();
+    }
+}
+
+module! {
+    type: RamDiskModule,
+    name: "ramdisk",
+    author: "Rust Kernel Contributors",
+    description: "RAM disk block device driver",
+    license: "GPL-2.0",
+}

kernel/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "kernel"
+version = "0.1.0"
+edition = "2021"
+authors = ["Rust Kernel Contributors"]
+description = "Core kernel APIs and functionality"
+license = "GPL-2.0"
+
+[lib]
+name = "kernel"
+crate-type = ["rlib"]
+
+[dependencies]
+spin = "0.9"
+bitflags = "2.4"
+linked_list_allocator = "0.10"
+once_cell = { version = "1.19", default-features = false, features = ["critical-section"] }
+
+[features]
+default = []
+alloc = []
+smp = []  # Symmetric Multi-Processing
+debug = []

kernel/src/arch/mod.rs

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Architecture-specific code
+
+#[cfg(target_arch = "x86_64")]
+pub mod x86_64;
+
+#[cfg(target_arch = "aarch64")]
+pub mod aarch64;
+
+#[cfg(target_arch = "riscv64")]
+pub mod riscv64;

kernel/src/arch/x86_64/gdt.rs

@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! GDT stub
+pub fn init() {}

kernel/src/arch/x86_64/idt.rs

@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! IDT stub
+pub fn init() {}

kernel/src/arch/x86_64/mod.rs

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! x86_64 architecture support
+
+pub mod port;
+pub mod gdt;
+pub mod idt;
+pub mod paging;
+pub mod pic;

kernel/src/arch/x86_64/paging.rs

@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Paging stub
+pub fn init() {}

kernel/src/arch/x86_64/pic.rs

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Programmable Interrupt Controller (8259 PIC) support
+
+use crate::arch::x86_64::port::Port;
+
+/// Primary PIC ports
+const PIC1_COMMAND: u16 = 0x20;
+const PIC1_DATA: u16 = 0x21;
+
+/// Secondary PIC ports  
+const PIC2_COMMAND: u16 = 0xA0;
+const PIC2_DATA: u16 = 0xA1;
+
+/// PIC commands
+const PIC_EOI: u8 = 0x20; // End of Interrupt
+
+/// Initialize the PIC
+pub unsafe fn init_pic() {
+    let mut pic1_command = Port::new(PIC1_COMMAND);
+    let mut pic1_data = Port::new(PIC1_DATA);
+    let mut pic2_command = Port::new(PIC2_COMMAND);
+    let mut pic2_data = Port::new(PIC2_DATA);
+    
+    // Save masks
+    let mask1 = pic1_data.read() as u8;
+    let mask2 = pic2_data.read() as u8;
+    
+    // Initialize PIC1
+    pic1_command.write(0x11); // ICW1: Initialize + expect ICW4
+    io_wait();
+    pic1_data.write(0x20); // ICW2: PIC1 offset (32)
+    io_wait();
+    pic1_data.write(0x04); // ICW3: Tell PIC1 there's a PIC2 at IRQ2
+    io_wait();
+    pic1_data.write(0x01); // ICW4: 8086 mode
+    io_wait();
+    
+    // Initialize PIC2
+    pic2_command.write(0x11); // ICW1: Initialize + expect ICW4
+    io_wait();
+    pic2_data.write(0x28); // ICW2: PIC2 offset (40)
+    io_wait();
+    pic2_data.write(0x02); // ICW3: Tell PIC2 it's at IRQ2 of PIC1
+    io_wait();
+    pic2_data.write(0x01); // ICW4: 8086 mode
+    io_wait();
+    
+    // Restore masks
+    pic1_data.write(mask1 as u32);
+    pic2_data.write(mask2 as u32);
+}
+
+/// Send End of Interrupt signal
+pub unsafe fn send_eoi(irq: u8) {
+    let mut pic1_command = Port::new(PIC1_COMMAND);
+    let mut pic2_command = Port::new(PIC2_COMMAND);
+    
+    if irq >= 8 {
+        pic2_command.write(PIC_EOI as u32);
+    }
+    pic1_command.write(PIC_EOI as u32);
+}
+
+/// Mask (disable) an IRQ
+pub unsafe fn mask_irq(irq: u8) {
+    let port = if irq < 8 {
+        PIC1_DATA
+    } else {
+        PIC2_DATA
+    };
+    
+    let mut data_port = Port::new(port);
+    let value = data_port.read() as u8;
+    let mask = 1 << (irq % 8);
+    data_port.write((value | mask) as u32);
+}
+
+/// Unmask (enable) an IRQ
+pub unsafe fn unmask_irq(irq: u8) {
+    let port = if irq < 8 {
+        PIC1_DATA
+    } else {
+        PIC2_DATA
+    };
+    
+    let mut data_port = Port::new(port);
+    let value = data_port.read() as u8;
+    let mask = 1 << (irq % 8);
+    data_port.write((value & !mask) as u32);
+}
+
+/// I/O wait - small delay for old hardware
+unsafe fn io_wait() {
+    let mut port = Port::new(0x80);
+    port.write(0);
+}

kernel/src/arch/x86_64/port.rs

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Port I/O operations
+
+/// Port I/O wrapper
+pub struct Port {
+    port: u16,
+}
+
+impl Port {
+    pub const fn new(port: u16) -> Self {
+        Self { port }
+    }
+    
+    pub unsafe fn write(&mut self, value: u32) {
+        core::arch::asm!(
+            "out dx, eax",
+            in("dx") self.port,
+            in("eax") value,
+        );
+    }
+    
+    pub unsafe fn read(&mut self) -> u32 {
+        let value: u32;
+        core::arch::asm!(
+            "in eax, dx",
+            out("eax") value,
+            in("dx") self.port,
+        );
+        value
+    }
+}

kernel/src/boot.rs

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Boot initialization
+use crate::error::Result;
+
+pub fn init() -> Result<()> {
+    Ok(())
+}

kernel/src/console.rs

@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Console and kernel output
+
+use core::fmt::{self, Write};
+use crate::sync::Spinlock;
+use crate::error::Result;
+
+/// Console writer
+static CONSOLE: Spinlock<Console> = Spinlock::new(Console::new());
+
+struct Console {
+    initialized: bool,
+}
+
+impl Console {
+    const fn new() -> Self {
+        Self {
+            initialized: false,
+        }
+    }
+    
+    fn init(&mut self) -> Result<()> {
+        // TODO: Initialize actual console hardware
+        self.initialized = true;
+        Ok(())
+    }
+    
+    fn write_str(&self, s: &str) {
+        if !self.initialized {
+            return;
+        }
+        
+        for byte in s.bytes() {
+            self.write_byte(byte);
+        }
+    }
+    
+    fn write_byte(&self, byte: u8) {
+        #[cfg(target_arch = "x86_64")]
+        unsafe {
+            // Write to serial port (COM1)
+            core::arch::asm!(
+                "out dx, al",
+                in("dx") 0x3f8u16,
+                in("al") byte,
+            );
+        }
+    }
+}
+
+/// Initialize console
+pub fn init() -> Result<()> {
+    let mut console = CONSOLE.lock();
+    console.init()
+}
+
+/// Print function for kernel output
+pub fn _print(args: fmt::Arguments) {
+    let console = CONSOLE.lock();
+    let mut writer = ConsoleWriter(&*console);
+    writer.write_fmt(args).unwrap();
+}
+
+/// Print function for kernel messages with prefix
+pub fn _kprint(args: fmt::Arguments) {
+    let console = CONSOLE.lock();
+    let mut writer = ConsoleWriter(&*console);
+    writer.write_fmt(args).unwrap();
+}
+
+struct ConsoleWriter<'a>(&'a Console);
+
+impl Write for ConsoleWriter<'_> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        self.0.write_str(s);
+        Ok(())
+    }
+}

kernel/src/cpu.rs

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! CPU management
+use crate::error::Result;
+
+pub fn init() -> Result<()> {
+    Ok(())
+}

kernel/src/device.rs

@@ -0,0 +1,383 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Device management compatible with Linux kernel
+
+use crate::error::{Error, Result};
+use crate::driver::Driver;
+use crate::sync::Spinlock;
+use alloc::{vec::Vec, string::String, collections::BTreeMap, boxed::Box};
+use core::any::Any;
+
+/// Device types - Linux compatible
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum DeviceType {
+    Character,
+    Block,
+    Network,
+    Input,
+    Sound,
+    Video,
+    Misc,
+    Platform,
+    Pci,
+    Usb,
+}
+
+/// Device structure - similar to Linux struct device
+#[derive(Debug)]
+pub struct Device {
+    pub name: String,
+    pub device_type: DeviceType,
+    pub major: u32,
+    pub minor: u32,
+    pub driver: Option<Box<dyn Driver>>,
+    pub parent: Option<String>,
+    pub private_data: Option<Box<dyn Any + Send + Sync>>,
+    pub power_state: PowerState,
+    pub dma_coherent: bool,
+    pub numa_node: i32,
+}
+
+/// Device power states
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum PowerState {
+    On,
+    Suspend,
+    Hibernate,
+    Off,
+}
+
+impl Device {
+    pub fn new(name: String, device_type: DeviceType, major: u32, minor: u32) -> Self {
+        Self {
+            name,
+            device_type,
+            major,
+            minor,
+            driver: None,
+            parent: None,
+            private_data: None,
+            power_state: PowerState::On,
+            dma_coherent: false,
+            numa_node: -1,
+        }
+    }
+    
+    /// Set device driver
+    pub fn set_driver(&mut self, driver: Box<dyn Driver>) -> Result<()> {
+        // Probe the device with the driver
+        driver.probe(self)?;
+        self.driver = Some(driver);
+        Ok(())
+    }
+    
+    /// Remove device driver
+    pub fn remove_driver(&mut self) -> Result<()> {
+        if let Some(ref driver) = self.driver {
+            driver.remove(self)?;
+        }
+        self.driver = None;
+        Ok(())
+    }
+    
+    /// Get device name
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+    
+    /// Check if device has driver
+    pub fn has_driver(&self) -> bool {
+        self.driver.is_some()
+    }
+    
+    /// Set private data
+    pub fn set_private_data<T: Any + Send + Sync>(&mut self, data: T) {
+        self.private_data = Some(Box::new(data));
+    }
+    
+    /// Get private data
+    pub fn get_private_data<T: Any + Send + Sync>(&self) -> Option<&T> {
+        self.private_data.as_ref()?.downcast_ref::<T>()
+    }
+    
+    /// Power management
+    pub fn suspend(&mut self) -> Result<()> {
+        if let Some(ref driver) = self.driver {
+            driver.suspend(self)?;
+        }
+        self.power_state = PowerState::Suspend;
+        Ok(())
+    }
+    
+    pub fn resume(&mut self) -> Result<()> {
+        if let Some(ref driver) = self.driver {
+            driver.resume(self)?;
+        }
+        self.power_state = PowerState::On;
+        Ok(())
+    }
+}
+
+/// Character device structure - Linux compatible
+#[derive(Debug)]
+pub struct CharDevice {
+    pub major: u32,
+    pub minor_start: u32,
+    pub minor_count: u32,
+    pub name: String,
+    pub fops: Option<Box<dyn FileOperations>>,
+}
+
+impl CharDevice {
+    pub fn new(major: u32, minor_start: u32, minor_count: u32, name: String) -> Self {
+        Self {
+            major,
+            minor_start,
+            minor_count,
+            name,
+            fops: None,
+        }
+    }
+}
+
+/// Block device structure - Linux compatible  
+#[derive(Debug)]
+pub struct BlockDevice {
+    pub major: u32,
+    pub minor: u32,
+    pub name: String,
+    pub size: u64, // Size in bytes
+    pub block_size: u32,
+}
+
+impl BlockDevice {
+    pub fn new(major: u32, minor: u32, name: String, size: u64, block_size: u32) -> Self {
+        Self {
+            major,
+            minor,
+            name,
+            size,
+            block_size,
+        }
+    }
+}
+
+/// File operations structure - Linux compatible
+pub trait FileOperations: Send + Sync {
+    fn open(&self, inode: &Inode, file: &mut File) -> Result<()>;
+    fn release(&self, inode: &Inode, file: &mut File) -> Result<()>;
+    fn read(&self, file: &mut File, buf: &mut [u8], offset: u64) -> Result<usize>;
+    fn write(&self, file: &mut File, buf: &[u8], offset: u64) -> Result<usize>;
+    fn ioctl(&self, file: &mut File, cmd: u32, arg: usize) -> Result<usize>;
+    fn mmap(&self, file: &mut File, vma: &mut VMA) -> Result<()>;
+}
+
+/// Inode structure - simplified Linux compatible
+#[derive(Debug)]
+pub struct Inode {
+    pub ino: u64,
+    pub mode: u32,
+    pub uid: u32,
+    pub gid: u32,
+    pub size: u64,
+    pub blocks: u64,
+    pub rdev: u32, // Device number for device files
+}
+
+/// File structure - simplified Linux compatible
+#[derive(Debug)]
+pub struct File {
+    pub inode: Option<Box<Inode>>,
+    pub position: u64,
+    pub flags: u32,
+    pub private_data: Option<Box<dyn Any + Send + Sync>>,
+}
+
+impl File {
+    pub fn new() -> Self {
+        Self {
+            inode: None,
+            position: 0,
+            flags: 0,
+            private_data: None,
+        }
+    }
+}
+
+/// Virtual Memory Area - simplified
+#[derive(Debug)]
+pub struct VMA {
+    pub start: u64,
+    pub end: u64,
+    pub flags: u32,
+}
+
+/// Global device subsystem
+static DEVICE_SUBSYSTEM: Spinlock<DeviceSubsystem> = Spinlock::new(DeviceSubsystem::new());
+
+/// Device subsystem state
+struct DeviceSubsystem {
+    devices: BTreeMap<String, Device>,
+    char_devices: BTreeMap<u32, CharDevice>, // major -> CharDevice
+    block_devices: BTreeMap<u32, BlockDevice>, // major -> BlockDevice
+    next_major: u32,
+}
+
+impl DeviceSubsystem {
+    const fn new() -> Self {
+        Self {
+            devices: BTreeMap::new(),
+            char_devices: BTreeMap::new(),
+            block_devices: BTreeMap::new(),
+            next_major: 240, // Start with dynamic major numbers
+        }
+    }
+    
+    fn register_device(&mut self, device: Device) -> Result<()> {
+        let name = device.name.clone();
+        if self.devices.contains_key(&name) {
+            return Err(Error::Busy);
+        }
+        self.devices.insert(name, device);
+        Ok(())
+    }
+    
+    fn unregister_device(&mut self, name: &str) -> Result<Device> {
+        self.devices.remove(name).ok_or(Error::NotFound)
+    }
+    
+    fn find_device(&self, name: &str) -> Option<&Device> {
+        self.devices.get(name)
+    }
+    
+    fn find_device_mut(&mut self, name: &str) -> Option<&mut Device> {
+        self.devices.get_mut(name)
+    }
+    
+    fn allocate_major(&mut self) -> u32 {
+        let major = self.next_major;
+        self.next_major += 1;
+        major
+    }
+}
+
+/// Initialize device subsystem
+pub fn init() -> Result<()> {
+    let mut subsystem = DEVICE_SUBSYSTEM.lock();
+    
+    // Register standard character devices
+    register_std_char_devices(&mut subsystem)?;
+    
+    // Register standard block devices  
+    register_std_block_devices(&mut subsystem)?;
+    
+    crate::info!("Device subsystem initialized");
+    Ok(())
+}
+
+/// Register standard character devices
+fn register_std_char_devices(subsystem: &mut DeviceSubsystem) -> Result<()> {
+    // /dev/null (major 1, minor 3)
+    let null_dev = CharDevice::new(1, 3, 1, String::from("null"));
+    subsystem.char_devices.insert(1, null_dev);
+    
+    // /dev/zero (major 1, minor 5)
+    let zero_dev = CharDevice::new(1, 5, 1, String::from("zero"));
+    // Note: This would overwrite the previous entry, so we need a better structure
+    // For now, simplified
+    
+    // /dev/random (major 1, minor 8)
+    let random_dev = CharDevice::new(1, 8, 1, String::from("random"));
+    
+    // /dev/urandom (major 1, minor 9)
+    let urandom_dev = CharDevice::new(1, 9, 1, String::from("urandom"));
+    
+    Ok(())
+}
+
+/// Register standard block devices
+fn register_std_block_devices(subsystem: &mut DeviceSubsystem) -> Result<()> {
+    // RAM disk (major 1)
+    let ramdisk = BlockDevice::new(1, 0, String::from("ram0"), 16 * 1024 * 1024, 4096);
+    subsystem.block_devices.insert(1, ramdisk);
+    
+    Ok(())
+}
+
+/// Register a device
+pub fn register_device(device: Device) -> Result<()> {
+    let mut subsystem = DEVICE_SUBSYSTEM.lock();
+    subsystem.register_device(device)
+}
+
+/// Unregister a device
+pub fn unregister_device(name: &str) -> Result<Device> {
+    let mut subsystem = DEVICE_SUBSYSTEM.lock();
+    subsystem.unregister_device(name)
+}
+
+/// Find a device by name
+pub fn find_device(name: &str) -> Option<Device> {
+    let subsystem = DEVICE_SUBSYSTEM.lock();
+    subsystem.find_device(name).cloned()
+}
+
+/// Register a character device
+pub fn register_chrdev(major: u32, name: String, fops: Box<dyn FileOperations>) -> Result<u32> {
+    let mut subsystem = DEVICE_SUBSYSTEM.lock();
+    
+    let actual_major = if major == 0 {
+        subsystem.allocate_major()
+    } else {
+        major
+    };
+    
+    let mut char_dev = CharDevice::new(actual_major, 0, 256, name);
+    char_dev.fops = Some(fops);
+    
+    if subsystem.char_devices.contains_key(&actual_major) {
+        return Err(Error::Busy);
+    }
+    
+    subsystem.char_devices.insert(actual_major, char_dev);
+    Ok(actual_major)
+}
+
+/// Unregister a character device
+pub fn unregister_chrdev(major: u32) -> Result<()> {
+    let mut subsystem = DEVICE_SUBSYSTEM.lock();
+    
+    if subsystem.char_devices.remove(&major).is_some() {
+        Ok(())
+    } else {
+        Err(Error::NotFound)
+    }
+}
+
+/// List all devices
+pub fn list_devices() -> Vec<String> {
+    let subsystem = DEVICE_SUBSYSTEM.lock();
+    subsystem.devices.keys().cloned().collect()
+}
+
+/// Device tree node - for device tree support
+#[derive(Debug)]
+pub struct DeviceTreeNode {
+    pub name: String,
+    pub compatible: Vec<String>,
+    pub reg: Vec<u64>,
+    pub interrupts: Vec<u32>,
+    pub properties: BTreeMap<String, Vec<u8>>,
+}
+
+impl DeviceTreeNode {
+    pub fn new(name: String) -> Self {
+        Self {
+            name,
+            compatible: Vec::new(),
+            reg: Vec::new(),
+            interrupts: Vec::new(),
+            properties: BTreeMap::new(),
+        }
+    }
+}

kernel/src/driver.rs

@@ -0,0 +1,384 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Driver framework compatible with Linux kernel
+
+use crate::error::{Error, Result};
+use crate::device::Device;
+use crate::sync::Spinlock;
+use alloc::{vec::Vec, string::String, collections::BTreeMap, boxed::Box};
+
+/// Driver trait - Linux compatible
+pub trait Driver: Send + Sync {
+    /// Driver name
+    fn name(&self) -> &str;
+    
+    /// Probe function - called when device is found
+    fn probe(&self, device: &mut Device) -> Result<()>;
+    
+    /// Remove function - called when device is removed
+    fn remove(&self, device: &mut Device) -> Result<()>;
+    
+    /// Suspend function - power management
+    fn suspend(&self, device: &mut Device) -> Result<()> {
+        // Default implementation does nothing
+        Ok(())
+    }
+    
+    /// Resume function - power management
+    fn resume(&self, device: &mut Device) -> Result<()> {
+        // Default implementation does nothing
+        Ok(())
+    }
+    
+    /// Shutdown function - system shutdown
+    fn shutdown(&self, device: &mut Device) {
+        // Default implementation does nothing
+    }
+}
+
+/// Driver operations for character devices
+pub trait CharDriverOps: Send + Sync {
+    fn open(&self, inode: &crate::device::Inode, file: &mut crate::device::File) -> Result<()>;
+    fn release(&self, inode: &crate::device::Inode, file: &mut crate::device::File) -> Result<()>;
+    fn read(&self, file: &mut crate::device::File, buf: &mut [u8], offset: u64) -> Result<usize>;
+    fn write(&self, file: &mut crate::device::File, buf: &[u8], offset: u64) -> Result<usize>;
+    fn ioctl(&self, file: &mut crate::device::File, cmd: u32, arg: usize) -> Result<usize>;
+}
+
+/// Driver operations for block devices
+pub trait BlockDriverOps: Send + Sync {
+    fn read_block(&self, block: u64, buffer: &mut [u8]) -> Result<usize>;
+    fn write_block(&self, block: u64, buffer: &[u8]) -> Result<usize>;
+    fn get_block_size(&self) -> u32;
+    fn get_total_blocks(&self) -> u64;
+    fn flush(&self) -> Result<()>;
+}
+
+/// Platform driver - for platform devices
+pub trait PlatformDriver: Driver {
+    /// Match function - check if driver supports device
+    fn match_device(&self, device: &Device) -> bool;
+    
+    /// Get supported device IDs
+    fn device_ids(&self) -> &[DeviceId];
+}
+
+/// Device ID structure - for driver matching
+#[derive(Debug, Clone)]
+pub struct DeviceId {
+    pub name: String,
+    pub vendor_id: Option<u32>,
+    pub device_id: Option<u32>,
+    pub class: Option<u32>,
+    pub compatible: Vec<String>, // Device tree compatible strings
+}
+
+impl DeviceId {
+    pub fn new(name: String) -> Self {
+        Self {
+            name,
+            vendor_id: None,
+            device_id: None,
+            class: None,
+            compatible: Vec::new(),
+        }
+    }
+    
+    pub fn with_vendor_device(mut self, vendor_id: u32, device_id: u32) -> Self {
+        self.vendor_id = Some(vendor_id);
+        self.device_id = Some(device_id);
+        self
+    }
+    
+    pub fn with_compatible(mut self, compatible: Vec<String>) -> Self {
+        self.compatible = compatible;
+        self
+    }
+}
+
+/// PCI driver - for PCI devices  
+pub trait PciDriver: Driver {
+    /// PCI device IDs supported by this driver
+    fn pci_ids(&self) -> &[PciDeviceId];
+    
+    /// PCI-specific probe
+    fn pci_probe(&self, pci_dev: &mut PciDevice) -> Result<()>;
+    
+    /// PCI-specific remove
+    fn pci_remove(&self, pci_dev: &mut PciDevice) -> Result<()>;
+}
+
+/// PCI device ID
+#[derive(Debug, Clone, Copy)]
+pub struct PciDeviceId {
+    pub vendor: u16,
+    pub device: u16,
+    pub subvendor: u16,
+    pub subdevice: u16,
+    pub class: u32,
+    pub class_mask: u32,
+}
+
+impl PciDeviceId {
+    pub const fn new(vendor: u16, device: u16) -> Self {
+        Self {
+            vendor,
+            device,
+            subvendor: 0xFFFF, // PCI_ANY_ID
+            subdevice: 0xFFFF,
+            class: 0,
+            class_mask: 0,
+        }
+    }
+}
+
+/// PCI device structure
+#[derive(Debug)]
+pub struct PciDevice {
+    pub vendor: u16,
+    pub device: u16,
+    pub subsystem_vendor: u16,
+    pub subsystem_device: u16,
+    pub class: u32,
+    pub revision: u8,
+    pub bus: u8,
+    pub slot: u8,
+    pub function: u8,
+    pub irq: u32,
+    pub bars: [PciBar; 6],
+}
+
+/// PCI Base Address Register
+#[derive(Debug, Clone, Copy)]
+pub struct PciBar {
+    pub address: u64,
+    pub size: u64,
+    pub flags: u32,
+}
+
+impl PciBar {
+    pub fn new() -> Self {
+        Self {
+            address: 0,
+            size: 0,
+            flags: 0,
+        }
+    }
+    
+    pub fn is_io(&self) -> bool {
+        self.flags & 1 != 0
+    }
+    
+    pub fn is_memory(&self) -> bool {
+        !self.is_io()
+    }
+    
+    pub fn is_64bit(&self) -> bool {
+        self.is_memory() && (self.flags & 0x6) == 0x4
+    }
+}
+
+/// USB driver - for USB devices
+pub trait UsbDriver: Driver {
+    /// USB device IDs supported by this driver
+    fn usb_ids(&self) -> &[UsbDeviceId];
+    
+    /// USB-specific probe
+    fn usb_probe(&self, usb_dev: &mut UsbDevice) -> Result<()>;
+    
+    /// USB-specific disconnect
+    fn usb_disconnect(&self, usb_dev: &mut UsbDevice) -> Result<()>;
+}
+
+/// USB device ID
+#[derive(Debug, Clone, Copy)]
+pub struct UsbDeviceId {
+    pub vendor: u16,
+    pub product: u16,
+    pub device_class: u8,
+    pub device_subclass: u8,
+    pub device_protocol: u8,
+    pub interface_class: u8,
+    pub interface_subclass: u8,
+    pub interface_protocol: u8,
+}
+
+/// USB device structure
+#[derive(Debug)]
+pub struct UsbDevice {
+    pub vendor: u16,
+    pub product: u16,
+    pub device_class: u8,
+    pub device_subclass: u8,
+    pub device_protocol: u8,
+    pub speed: UsbSpeed,
+    pub address: u8,
+    pub configuration: u8,
+}
+
+/// USB speeds
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum UsbSpeed {
+    Low,    // 1.5 Mbps
+    Full,   // 12 Mbps
+    High,   // 480 Mbps
+    Super,  // 5 Gbps
+    SuperPlus, // 10 Gbps
+}
+
+/// Global driver subsystem
+static DRIVER_SUBSYSTEM: Spinlock<DriverSubsystem> = Spinlock::new(DriverSubsystem::new());
+
+/// Driver subsystem state
+struct DriverSubsystem {
+    drivers: BTreeMap<String, Box<dyn Driver>>,
+    platform_drivers: Vec<Box<dyn PlatformDriver>>,
+    pci_drivers: Vec<Box<dyn PciDriver>>,
+    usb_drivers: Vec<Box<dyn UsbDriver>>,
+}
+
+impl DriverSubsystem {
+    const fn new() -> Self {
+        Self {
+            drivers: BTreeMap::new(),
+            platform_drivers: Vec::new(),
+            pci_drivers: Vec::new(),
+            usb_drivers: Vec::new(),
+        }
+    }
+    
+    fn register_driver(&mut self, driver: Box<dyn Driver>) -> Result<()> {
+        let name = driver.name().to_string();
+        if self.drivers.contains_key(&name) {
+            return Err(Error::Busy);
+        }
+        self.drivers.insert(name, driver);
+        Ok(())
+    }
+    
+    fn unregister_driver(&mut self, name: &str) -> Result<()> {
+        if self.drivers.remove(name).is_some() {
+            Ok(())
+        } else {
+            Err(Error::NotFound)
+        }
+    }
+    
+    fn find_driver(&self, name: &str) -> Option<&dyn Driver> {
+        self.drivers.get(name).map(|d| d.as_ref())
+    }
+}
+
+/// Register a driver
+pub fn register_driver(driver: Box<dyn Driver>) -> Result<()> {
+    let mut subsystem = DRIVER_SUBSYSTEM.lock();
+    let name = driver.name().to_string();
+    subsystem.register_driver(driver)?;
+    crate::info!("Registered driver: {}", name);
+    Ok(())
+}
+
+/// Unregister a driver
+pub fn unregister_driver(name: &str) -> Result<()> {
+    let mut subsystem = DRIVER_SUBSYSTEM.lock();
+    subsystem.unregister_driver(name)?;
+    crate::info!("Unregistered driver: {}", name);
+    Ok(())
+}
+
+/// Register a platform driver
+pub fn register_platform_driver(driver: Box<dyn PlatformDriver>) -> Result<()> {
+    let mut subsystem = DRIVER_SUBSYSTEM.lock();
+    let name = driver.name().to_string();
+    
+    // Also register as a regular driver
+    let driver_copy = unsafe {
+        // This is a bit of a hack - we need to clone the driver
+        // In a real implementation, we'd use Arc or similar
+        core::mem::transmute::<*const dyn PlatformDriver, Box<dyn Driver>>(
+            driver.as_ref() as *const dyn PlatformDriver
+        )
+    };
+    subsystem.register_driver(driver_copy)?;
+    subsystem.platform_drivers.push(driver);
+    
+    crate::info!("Registered platform driver: {}", name);
+    Ok(())
+}
+
+/// Register a PCI driver
+pub fn register_pci_driver(driver: Box<dyn PciDriver>) -> Result<()> {
+    let mut subsystem = DRIVER_SUBSYSTEM.lock();
+    let name = driver.name().to_string();
+    subsystem.pci_drivers.push(driver);
+    crate::info!("Registered PCI driver: {}", name);
+    Ok(())
+}
+
+/// Register a USB driver
+pub fn register_usb_driver(driver: Box<dyn UsbDriver>) -> Result<()> {
+    let mut subsystem = DRIVER_SUBSYSTEM.lock();
+    let name = driver.name().to_string();
+    subsystem.usb_drivers.push(driver);
+    crate::info!("Registered USB driver: {}", name);
+    Ok(())
+}
+
+/// Find and match a driver for a device
+pub fn match_driver(device: &Device) -> Option<String> {
+    let subsystem = DRIVER_SUBSYSTEM.lock();
+    
+    // Try platform drivers first
+    for driver in &subsystem.platform_drivers {
+        if driver.match_device(device) {
+            return Some(driver.name().to_string());
+        }
+    }
+    
+    // TODO: Try PCI, USB, etc. drivers based on device type
+    
+    None
+}
+
+/// Get list of registered drivers
+pub fn list_drivers() -> Vec<String> {
+    let subsystem = DRIVER_SUBSYSTEM.lock();
+    subsystem.drivers.keys().cloned().collect()
+}
+
+/// Module macros for easier driver registration
+#[macro_export]
+macro_rules! platform_driver {
+    ($driver:ident) => {
+        #[no_mangle]
+        pub extern "C" fn init_module() -> core::ffi::c_int {
+            match $crate::driver::register_platform_driver(Box::new($driver)) {
+                Ok(()) => 0,
+                Err(e) => e.to_errno(),
+            }
+        }
+        
+        #[no_mangle]
+        pub extern "C" fn cleanup_module() {
+            $crate::driver::unregister_driver(stringify!($driver)).ok();
+        }
+    };
+}
+
+#[macro_export]
+macro_rules! pci_driver {
+    ($driver:ident) => {
+        #[no_mangle]
+        pub extern "C" fn init_module() -> core::ffi::c_int {
+            match $crate::driver::register_pci_driver(Box::new($driver)) {
+                Ok(()) => 0,
+                Err(e) => e.to_errno(),
+            }
+        }
+        
+        #[no_mangle]
+        pub extern "C" fn cleanup_module() {
+            $crate::driver::unregister_driver(stringify!($driver)).ok();
+        }
+    };
+}

kernel/src/error.rs

@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Error handling types and utilities
+
+use core::fmt;
+
+/// Kernel error type
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Error {
+    /// Out of memory
+    OutOfMemory,
+    /// Invalid argument
+    InvalidArgument,
+    /// Permission denied
+    PermissionDenied,
+    /// Resource busy
+    Busy,
+    /// Resource not found
+    NotFound,
+    /// Operation not supported
+    NotSupported,
+    /// I/O error
+    Io,
+    /// Interrupted operation
+    Interrupted,
+    /// Resource temporarily unavailable
+    WouldBlock,
+    /// Device error
+    Device,
+    /// Generic error
+    Generic,
+}
+
+impl Error {
+    /// Convert error to errno value
+    pub fn to_errno(self) -> i32 {
+        match self {
+            Error::OutOfMemory => -12,        // ENOMEM
+            Error::InvalidArgument => -22,    // EINVAL
+            Error::PermissionDenied => -1,    // EPERM
+            Error::Busy => -16,               // EBUSY
+            Error::NotFound => -2,            // ENOENT
+            Error::NotSupported => -38,       // ENOSYS
+            Error::Io => -5,                  // EIO
+            Error::Interrupted => -4,         // EINTR
+            Error::WouldBlock => -11,         // EAGAIN
+            Error::Device => -19,             // ENODEV
+            Error::Generic => -1,             // EPERM
+        }
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::OutOfMemory => write!(f, "Out of memory"),
+            Error::InvalidArgument => write!(f, "Invalid argument"),
+            Error::PermissionDenied => write!(f, "Permission denied"),
+            Error::Busy => write!(f, "Resource busy"),
+            Error::NotFound => write!(f, "Resource not found"),
+            Error::NotSupported => write!(f, "Operation not supported"),
+            Error::Io => write!(f, "I/O error"),
+            Error::Interrupted => write!(f, "Interrupted operation"),
+            Error::WouldBlock => write!(f, "Resource temporarily unavailable"),
+            Error::Device => write!(f, "Device error"),
+            Error::Generic => write!(f, "Generic error"),
+        }
+    }
+}
+
+/// Kernel result type
+pub type Result<T> = core::result::Result<T, Error>;
+
+/// Convert from various error types
+impl From<()> for Error {
+    fn from(_: ()) -> Self {
+        Error::Generic
+    }
+}
+
+impl From<core::alloc::AllocError> for Error {
+    fn from(_: core::alloc::AllocError) -> Self {
+        Error::OutOfMemory
+    }
+}

kernel/src/fs/dentry.rs

@@ -0,0 +1,283 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Directory entry (dentry) abstraction - Linux compatible
+
+use crate::error::{Error, Result};
+use crate::sync::{Arc, Mutex, RwLock};
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::sync::atomic::{AtomicU32, Ordering};
+
+/// Dentry structure - similar to Linux struct dentry
+pub struct Dentry {
+    /// Entry name
+    pub d_name: String,
+    /// Associated inode
+    pub d_inode: Option<Arc<super::Inode>>,
+    /// Parent dentry
+    pub d_parent: Option<Arc<Dentry>>,
+    /// Child entries (for directories)
+    pub d_subdirs: Mutex<Vec<Arc<Dentry>>>,
+    /// Dentry operations
+    pub d_op: Option<Arc<dyn DentryOperations>>,
+    /// Superblock
+    pub d_sb: Option<Arc<super::SuperBlock>>,
+    /// Reference count
+    pub d_count: AtomicU32,
+    /// Dentry flags
+    pub d_flags: AtomicU32,
+    /// Hash for dcache
+    pub d_hash: u32,
+}
+
+impl Dentry {
+    /// Create a new dentry
+    pub fn new(name: String, inode: Option<Arc<super::Inode>>) -> Self {
+        Self {
+            d_name: name,
+            d_inode: inode,
+            d_parent: None,
+            d_subdirs: Mutex::new(Vec::new()),
+            d_op: None,
+            d_sb: None,
+            d_count: AtomicU32::new(1),
+            d_flags: AtomicU32::new(0),
+            d_hash: 0, // TODO: Calculate hash
+        }
+    }
+    
+    /// Set parent dentry
+    pub fn set_parent(&mut self, parent: Arc<Dentry>) {
+        self.d_parent = Some(parent);
+    }
+    
+    /// Add child dentry
+    pub fn add_child(&self, child: Arc<Dentry>) {
+        let mut subdirs = self.d_subdirs.lock();
+        subdirs.push(child);
+    }
+    
+    /// Find child dentry by name
+    pub fn find_child(&self, name: &str) -> Option<Arc<Dentry>> {
+        let subdirs = self.d_subdirs.lock();
+        for child in subdirs.iter() {
+            if child.d_name == name {
+                return Some(child.clone());
+            }
+        }
+        None
+    }
+    
+    /// Get full path of this dentry
+    pub fn get_path(&self) -> String {
+        if let Some(ref parent) = self.d_parent {
+            if parent.d_name == "/" {
+                format!("/{}", self.d_name)
+            } else {
+                format!("{}/{}", parent.get_path(), self.d_name)
+            }
+        } else {
+            self.d_name.clone()
+        }
+    }
+    
+    /// Check if dentry is root
+    pub fn is_root(&self) -> bool {
+        self.d_parent.is_none() || self.d_name == "/"
+    }
+    
+    /// Increment reference count
+    pub fn dget(&self) {
+        self.d_count.fetch_add(1, Ordering::Relaxed);
+    }
+    
+    /// Decrement reference count
+    pub fn dput(&self) {
+        let old_count = self.d_count.fetch_sub(1, Ordering::Relaxed);
+        if old_count == 1 {
+            // Last reference, dentry should be cleaned up
+            // TODO: Call d_delete operation if present
+        }
+    }
+    
+    /// Revalidate dentry
+    pub fn revalidate(&self) -> Result<bool> {
+        if let Some(ref ops) = self.d_op {
+            ops.revalidate(self)
+        } else {
+            Ok(true) // Always valid by default
+        }
+    }
+    
+    /// Delete dentry
+    pub fn delete(&self) -> Result<()> {
+        if let Some(ref ops) = self.d_op {
+            ops.delete(self)
+        } else {
+            Ok(())
+        }
+    }
+    
+    /// Compare two dentries
+    pub fn compare(&self, other: &Dentry) -> Result<bool> {
+        if let Some(ref ops) = self.d_op {
+            ops.compare(self, other)
+        } else {
+            Ok(self.d_name == other.d_name)
+        }
+    }
+    
+    /// Hash dentry name
+    pub fn hash(&self) -> Result<u32> {
+        if let Some(ref ops) = self.d_op {
+            ops.hash(self)
+        } else {
+            // Simple hash function
+            let mut hash = 0u32;
+            for byte in self.d_name.bytes() {
+                hash = hash.wrapping_mul(31).wrapping_add(byte as u32);
+            }
+            Ok(hash)
+        }
+    }
+}
+
+unsafe impl Send for Dentry {}
+unsafe impl Sync for Dentry {}
+
+/// Dentry operations trait - similar to Linux dentry_operations
+pub trait DentryOperations: Send + Sync {
+    /// Revalidate dentry
+    fn revalidate(&self, dentry: &Dentry) -> Result<bool>;
+    
+    /// Hash dentry name
+    fn hash(&self, dentry: &Dentry) -> Result<u32>;
+    
+    /// Compare two dentries
+    fn compare(&self, d1: &Dentry, d2: &Dentry) -> Result<bool>;
+    
+    /// Delete dentry
+    fn delete(&self, dentry: &Dentry) -> Result<()>;
+    
+    /// Release dentry
+    fn release(&self, dentry: &Dentry) -> Result<()>;
+    
+    /// Canonicalize path
+    fn canonical_path(&self, dentry: &Dentry) -> Result<String>;
+}
+
+/// Generic dentry operations
+pub struct GenericDentryOps;
+
+impl DentryOperations for GenericDentryOps {
+    fn revalidate(&self, dentry: &Dentry) -> Result<bool> {
+        Ok(true)
+    }
+    
+    fn hash(&self, dentry: &Dentry) -> Result<u32> {
+        dentry.hash()
+    }
+    
+    fn compare(&self, d1: &Dentry, d2: &Dentry) -> Result<bool> {
+        Ok(d1.d_name == d2.d_name)
+    }
+    
+    fn delete(&self, dentry: &Dentry) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, dentry: &Dentry) -> Result<()> {
+        Ok(())
+    }
+    
+    fn canonical_path(&self, dentry: &Dentry) -> Result<String> {
+        Ok(dentry.get_path())
+    }
+}
+
+/// Dentry cache (dcache) - simplified version
+pub struct DentryCache {
+    /// Cached dentries
+    cache: Mutex<alloc::collections::BTreeMap<String, Arc<Dentry>>>,
+    /// Hash buckets for faster lookup
+    hash_table: Vec<Mutex<Vec<Arc<Dentry>>>>,
+}
+
+impl DentryCache {
+    /// Create a new dentry cache
+    pub fn new() -> Self {
+        const HASH_BUCKETS: usize = 256;
+        let mut hash_table = Vec::with_capacity(HASH_BUCKETS);
+        for _ in 0..HASH_BUCKETS {
+            hash_table.push(Mutex::new(Vec::new()));
+        }
+        
+        Self {
+            cache: Mutex::new(alloc::collections::BTreeMap::new()),
+            hash_table,
+        }
+    }
+    
+    /// Look up dentry by path
+    pub fn lookup(&self, path: &str) -> Option<Arc<Dentry>> {
+        let cache = self.cache.lock();
+        cache.get(path).cloned()
+    }
+    
+    /// Insert dentry into cache
+    pub fn insert(&self, path: String, dentry: Arc<Dentry>) {
+        let mut cache = self.cache.lock();
+        cache.insert(path, dentry.clone());
+        
+        // Also insert into hash table
+        let hash = dentry.d_hash as usize % self.hash_table.len();
+        let mut bucket = self.hash_table[hash].lock();
+        bucket.push(dentry);
+    }
+    
+    /// Remove dentry from cache
+    pub fn remove(&self, path: &str) -> Option<Arc<Dentry>> {
+        let mut cache = self.cache.lock();
+        cache.remove(path)
+    }
+    
+    /// Prune unused dentries
+    pub fn prune(&self) {
+        let mut cache = self.cache.lock();
+        cache.retain(|_, dentry| {
+            dentry.d_count.load(Ordering::Relaxed) > 1
+        });
+        
+        // Also prune hash table
+        for bucket in &self.hash_table {
+            let mut bucket = bucket.lock();
+            bucket.retain(|dentry| {
+                dentry.d_count.load(Ordering::Relaxed) > 1
+            });
+        }
+    }
+}
+
+/// Global dentry cache
+static DCACHE: once_cell::sync::Lazy<DentryCache> = 
+    once_cell::sync::Lazy::new(|| DentryCache::new());
+
+/// Look up dentry in cache
+pub fn dcache_lookup(path: &str) -> Option<Arc<Dentry>> {
+    DCACHE.lookup(path)
+}
+
+/// Insert dentry into cache
+pub fn dcache_insert(path: String, dentry: Arc<Dentry>) {
+    DCACHE.insert(path, dentry);
+}
+
+/// Remove dentry from cache
+pub fn dcache_remove(path: &str) -> Option<Arc<Dentry>> {
+    DCACHE.remove(path)
+}
+
+/// Prune dentry cache
+pub fn dcache_prune() {
+    DCACHE.prune();
+}

kernel/src/fs/devfs.rs

@@ -0,0 +1,441 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Character device filesystem integration
+//!
+//! This driver provides VFS integration for character devices
+//! like /dev/null, /dev/zero, /dev/random, etc.
+
+use crate::error::{Error, Result};
+use crate::fs::*;
+use crate::memory::UserSlicePtr;
+use crate::sync::Arc;
+use alloc::string::String;
+
+/// Character device file operations
+pub struct CharDevFileOps {
+    /// Device operations
+    dev_ops: Option<Arc<dyn CharDevOperations>>,
+}
+
+impl CharDevFileOps {
+    pub fn new(dev_ops: Option<Arc<dyn CharDevOperations>>) -> Self {
+        Self { dev_ops }
+    }
+}
+
+impl FileOperations for CharDevFileOps {
+    fn read(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        if let Some(ref ops) = self.dev_ops {
+            ops.read(file, buf, count)
+        } else {
+            Err(Error::ENODEV)
+        }
+    }
+    
+    fn write(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        if let Some(ref ops) = self.dev_ops {
+            ops.write(file, buf, count)
+        } else {
+            Err(Error::ENODEV)
+        }
+    }
+    
+    fn seek(&self, file: &File, offset: i64, whence: i32) -> Result<i64> {
+        // Most character devices don't support seeking
+        Err(Error::ESPIPE)
+    }
+    
+    fn ioctl(&self, file: &File, cmd: u32, arg: usize) -> Result<isize> {
+        if let Some(ref ops) = self.dev_ops {
+            ops.ioctl(file, cmd, arg)
+        } else {
+            Err(Error::ENOTTY)
+        }
+    }
+    
+    fn mmap(&self, file: &File, vma: &mut crate::memory::VmaArea) -> Result<()> {
+        if let Some(ref ops) = self.dev_ops {
+            ops.mmap(file, vma)
+        } else {
+            Err(Error::ENODEV)
+        }
+    }
+    
+    fn fsync(&self, file: &File, datasync: bool) -> Result<()> {
+        // Character devices don't need syncing
+        Ok(())
+    }
+    
+    fn poll(&self, file: &File, wait: &mut PollWait) -> Result<u32> {
+        if let Some(ref ops) = self.dev_ops {
+            ops.poll(file, wait)
+        } else {
+            Ok(POLLIN | POLLOUT)
+        }
+    }
+    
+    fn open(&self, inode: &Inode, file: &File) -> Result<()> {
+        if let Some(ref ops) = self.dev_ops {
+            ops.open(inode, file)
+        } else {
+            Ok(())
+        }
+    }
+    
+    fn release(&self, inode: &Inode, file: &File) -> Result<()> {
+        if let Some(ref ops) = self.dev_ops {
+            ops.release(inode, file)
+        } else {
+            Ok(())
+        }
+    }
+}
+
+/// Character device operations trait
+pub trait CharDevOperations: Send + Sync {
+    fn read(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize>;
+    fn write(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize>;
+    fn ioctl(&self, file: &File, cmd: u32, arg: usize) -> Result<isize>;
+    fn mmap(&self, file: &File, vma: &mut crate::memory::VmaArea) -> Result<()>;
+    fn poll(&self, file: &File, wait: &mut PollWait) -> Result<u32>;
+    fn open(&self, inode: &Inode, file: &File) -> Result<()>;
+    fn release(&self, inode: &Inode, file: &File) -> Result<()>;
+}
+
+/// /dev/null device operations
+pub struct NullDevOps;
+
+impl CharDevOperations for NullDevOps {
+    fn read(&self, _file: &File, _buf: UserSlicePtr, _count: usize) -> Result<isize> {
+        Ok(0) // EOF
+    }
+    
+    fn write(&self, _file: &File, _buf: UserSlicePtr, count: usize) -> Result<isize> {
+        Ok(count as isize) // Discard all data
+    }
+    
+    fn ioctl(&self, _file: &File, _cmd: u32, _arg: usize) -> Result<isize> {
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, _file: &File, _vma: &mut crate::memory::VmaArea) -> Result<()> {
+        Err(Error::ENODEV)
+    }
+    
+    fn poll(&self, _file: &File, _wait: &mut PollWait) -> Result<u32> {
+        Ok(POLLIN | POLLOUT) // Always ready
+    }
+    
+    fn open(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+}
+
+/// /dev/zero device operations
+pub struct ZeroDevOps;
+
+impl CharDevOperations for ZeroDevOps {
+    fn read(&self, _file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Fill buffer with zeros
+        let zeros = vec![0u8; count];
+        buf.copy_from_slice(&zeros)?;
+        Ok(count as isize)
+    }
+    
+    fn write(&self, _file: &File, _buf: UserSlicePtr, count: usize) -> Result<isize> {
+        Ok(count as isize) // Discard all data
+    }
+    
+    fn ioctl(&self, _file: &File, _cmd: u32, _arg: usize) -> Result<isize> {
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, _file: &File, _vma: &mut crate::memory::VmaArea) -> Result<()> {
+        // TODO: Map zero page
+        Err(Error::ENODEV)
+    }
+    
+    fn poll(&self, _file: &File, _wait: &mut PollWait) -> Result<u32> {
+        Ok(POLLIN | POLLOUT) // Always ready
+    }
+    
+    fn open(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+}
+
+/// /dev/full device operations
+pub struct FullDevOps;
+
+impl CharDevOperations for FullDevOps {
+    fn read(&self, _file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Fill buffer with zeros (like /dev/zero)
+        let zeros = vec![0u8; count];
+        buf.copy_from_slice(&zeros)?;
+        Ok(count as isize)
+    }
+    
+    fn write(&self, _file: &File, _buf: UserSlicePtr, _count: usize) -> Result<isize> {
+        Err(Error::ENOSPC) // No space left on device
+    }
+    
+    fn ioctl(&self, _file: &File, _cmd: u32, _arg: usize) -> Result<isize> {
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, _file: &File, _vma: &mut crate::memory::VmaArea) -> Result<()> {
+        Err(Error::ENODEV)
+    }
+    
+    fn poll(&self, _file: &File, _wait: &mut PollWait) -> Result<u32> {
+        Ok(POLLIN) // Only readable
+    }
+    
+    fn open(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+}
+
+/// /dev/random device operations (simplified)
+pub struct RandomDevOps;
+
+impl CharDevOperations for RandomDevOps {
+    fn read(&self, _file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Generate pseudo-random data
+        // TODO: Use proper random number generator
+        let mut random_data = vec![0u8; count];
+        for i in 0..count {
+            random_data[i] = (i * 37 + 13) as u8; // Very simple PRNG
+        }
+        buf.copy_from_slice(&random_data)?;
+        Ok(count as isize)
+    }
+    
+    fn write(&self, _file: &File, _buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // TODO: Add entropy to random pool
+        Ok(count as isize)
+    }
+    
+    fn ioctl(&self, _file: &File, _cmd: u32, _arg: usize) -> Result<isize> {
+        // TODO: Implement random device ioctls
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, _file: &File, _vma: &mut crate::memory::VmaArea) -> Result<()> {
+        Err(Error::ENODEV)
+    }
+    
+    fn poll(&self, _file: &File, _wait: &mut PollWait) -> Result<u32> {
+        Ok(POLLIN | POLLOUT) // Always ready
+    }
+    
+    fn open(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+    
+    fn release(&self, _inode: &Inode, _file: &File) -> Result<()> {
+        Ok(())
+    }
+}
+
+/// Create a character device inode
+pub fn create_char_device_inode(
+    major: u32,
+    minor: u32,
+    mode: u32,
+    ops: Arc<dyn CharDevOperations>,
+) -> Arc<Inode> {
+    let mut inode = Inode::new(0, mode::S_IFCHR | mode);
+    inode.i_rdev = crate::device::DeviceNumber::new(major, minor);
+    inode.set_file_operations(Arc::new(CharDevFileOps::new(Some(ops))));
+    
+    Arc::new(inode)
+}
+
+/// DevFS - device filesystem for /dev
+pub struct DevFs {
+    /// Device entries
+    devices: crate::sync::Mutex<alloc::collections::BTreeMap<String, Arc<Inode>>>,
+}
+
+impl DevFs {
+    pub fn new() -> Self {
+        let mut devfs = Self {
+            devices: crate::sync::Mutex::new(alloc::collections::BTreeMap::new()),
+        };
+        
+        devfs.create_standard_devices();
+        devfs
+    }
+    
+    fn create_standard_devices(&mut self) {
+        // Create /dev/null
+        let null_inode = create_char_device_inode(1, 3, 0o666, Arc::new(NullDevOps));
+        self.add_device("null", null_inode);
+        
+        // Create /dev/zero
+        let zero_inode = create_char_device_inode(1, 5, 0o666, Arc::new(ZeroDevOps));
+        self.add_device("zero", zero_inode);
+        
+        // Create /dev/full
+        let full_inode = create_char_device_inode(1, 7, 0o666, Arc::new(FullDevOps));
+        self.add_device("full", full_inode);
+        
+        // Create /dev/random
+        let random_inode = create_char_device_inode(1, 8, 0o666, Arc::new(RandomDevOps));
+        self.add_device("random", random_inode);
+        
+        // Create /dev/urandom (same as random for now)
+        let urandom_inode = create_char_device_inode(1, 9, 0o666, Arc::new(RandomDevOps));
+        self.add_device("urandom", urandom_inode);
+    }
+    
+    pub fn add_device(&mut self, name: &str, inode: Arc<Inode>) {
+        let mut devices = self.devices.lock();
+        devices.insert(String::from(name), inode);
+    }
+    
+    pub fn get_device(&self, name: &str) -> Option<Arc<Inode>> {
+        let devices = self.devices.lock();
+        devices.get(name).cloned()
+    }
+    
+    pub fn list_devices(&self) -> alloc::vec::Vec<String> {
+        let devices = self.devices.lock();
+        devices.keys().cloned().collect()
+    }
+}
+
+/// DevFS inode operations
+pub struct DevFsInodeOps {
+    devfs: *const DevFs,
+}
+
+impl DevFsInodeOps {
+    pub fn new(devfs: &DevFs) -> Self {
+        Self {
+            devfs: devfs as *const DevFs,
+        }
+    }
+    
+    fn get_devfs(&self) -> &DevFs {
+        unsafe { &*self.devfs }
+    }
+}
+
+unsafe impl Send for DevFsInodeOps {}
+unsafe impl Sync for DevFsInodeOps {}
+
+impl InodeOperations for DevFsInodeOps {
+    fn lookup(&self, dir: &Inode, name: &str) -> Result<Arc<Inode>> {
+        let devfs = self.get_devfs();
+        devfs.get_device(name).ok_or(Error::ENOENT)
+    }
+    
+    fn create(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        Err(Error::EPERM) // Can't create devices in /dev directly
+    }
+    
+    fn mkdir(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        Err(Error::EPERM)
+    }
+    
+    fn unlink(&self, dir: &Inode, name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn rmdir(&self, dir: &Inode, name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn symlink(&self, dir: &Inode, name: &str, target: &str) -> Result<Arc<Inode>> {
+        Err(Error::EPERM)
+    }
+    
+    fn rename(&self, old_dir: &Inode, old_name: &str, new_dir: &Inode, new_name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn setattr(&self, inode: &Inode, attr: &InodeAttr) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn getattr(&self, inode: &Inode) -> Result<InodeAttr> {
+        let generic_ops = GenericInodeOps;
+        generic_ops.getattr(inode)
+    }
+    
+    fn readlink(&self, inode: &Inode) -> Result<String> {
+        Err(Error::EINVAL)
+    }
+    
+    fn follow_link(&self, inode: &Inode) -> Result<Arc<Inode>> {
+        Err(Error::EINVAL)
+    }
+    
+    fn truncate(&self, inode: &Inode, size: u64) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn getxattr(&self, inode: &Inode, name: &str) -> Result<alloc::vec::Vec<u8>> {
+        Err(Error::ENODATA)
+    }
+    
+    fn setxattr(&self, inode: &Inode, name: &str, value: &[u8], flags: u32) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn listxattr(&self, inode: &Inode) -> Result<alloc::vec::Vec<String>> {
+        Ok(alloc::vec::Vec::new())
+    }
+    
+    fn removexattr(&self, inode: &Inode, name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+}
+
+/// Mount devfs
+pub fn mount_devfs(_dev_name: &str, _flags: u32, _data: Option<&str>) -> Result<Arc<SuperBlock>> {
+    let mut sb = SuperBlock::new("devfs")?;
+    sb.s_magic = 0x1373; // DEVFS magic
+    
+    let devfs = Box::leak(Box::new(DevFs::new()));
+    sb.s_fs_info = Some(devfs as *mut DevFs as *mut u8);
+    
+    // Create root inode
+    let root_inode = Arc::new({
+        let mut inode = Inode::new(1, mode::S_IFDIR | 0o755);
+        inode.set_operations(Arc::new(DevFsInodeOps::new(devfs)));
+        inode
+    });
+    
+    let root_dentry = Arc::new(Dentry::new(String::from("/"), Some(root_inode)));
+    sb.s_root = Some(root_dentry);
+    
+    Ok(Arc::new(sb))
+}
+
+/// Register devfs filesystem
+pub fn register_devfs() -> Result<()> {
+    let devfs_type = FileSystemType::new(
+        String::from("devfs"),
+        |_fstype, flags, _dev_name, data| mount_devfs(_dev_name, flags, data),
+        |_sb| Ok(()),
+    );
+    
+    // TODO: Register with VFS
+    crate::console::print_info("Registered devfs filesystem\n");
+    Ok(())
+}

kernel/src/fs/file.rs

@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! File abstraction - Linux compatible
+
+use crate::error::{Error, Result};
+use crate::types::*;
+use crate::memory::{UserPtr, UserSlicePtr};
+use crate::sync::{Arc, Mutex, RwLock};
+use alloc::string::String;
+use core::sync::atomic::{AtomicI64, AtomicU32, Ordering};
+
+/// File structure - similar to Linux struct file
+pub struct File {
+    /// File operations
+    pub f_op: Option<Arc<dyn FileOperations>>,
+    /// Current file position
+    pub pos: AtomicI64,
+    /// File flags
+    pub flags: AtomicU32,
+    /// File mode
+    pub mode: u32,
+    /// Associated inode
+    pub inode: Option<Arc<super::Inode>>,
+    /// Associated dentry
+    pub dentry: Option<Arc<super::Dentry>>,
+    /// Private data for file operations
+    pub private_data: Option<*mut u8>,
+    /// File path (for debugging/proc)
+    pub path: String,
+    /// Reference count
+    pub refcount: AtomicU32,
+}
+
+impl File {
+    /// Create a new file
+    pub fn new(path: &str, flags: u32, mode: u32) -> Result<Self> {
+        Ok(Self {
+            f_op: None,
+            pos: AtomicI64::new(0),
+            flags: AtomicU32::new(flags),
+            mode,
+            inode: None,
+            dentry: None,
+            private_data: None,
+            path: String::from(path),
+            refcount: AtomicU32::new(1),
+        })
+    }
+    
+    /// Set file operations
+    pub fn set_operations(&mut self, ops: Arc<dyn FileOperations>) {
+        self.f_op = Some(ops);
+    }
+    
+    /// Read from file
+    pub fn read(&self, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        if let Some(ref ops) = self.f_op {
+            ops.read(self, buf, count)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+    
+    /// Write to file
+    pub fn write(&self, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        if let Some(ref ops) = self.f_op {
+            ops.write(self, buf, count)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+    
+    /// Seek within file
+    pub fn seek(&self, offset: i64, whence: i32) -> Result<i64> {
+        if let Some(ref ops) = self.f_op {
+            let new_pos = ops.seek(self, offset, whence)?;
+            self.pos.store(new_pos, Ordering::Relaxed);
+            Ok(new_pos)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+    
+    /// Get file status
+    pub fn stat(&self) -> Result<super::KStat> {
+        if let Some(ref inode) = self.inode {
+            inode.stat()
+        } else {
+            // Create a basic stat structure
+            Ok(super::KStat {
+                st_dev: 0,
+                st_ino: 0,
+                st_nlink: 1,
+                st_mode: self.mode,
+                st_uid: 0,
+                st_gid: 0,
+                st_rdev: 0,
+                st_size: 0,
+                st_blksize: 4096,
+                st_blocks: 0,
+                st_atime: 0,
+                st_atime_nsec: 0,
+                st_mtime: 0,
+                st_mtime_nsec: 0,
+                st_ctime: 0,
+                st_ctime_nsec: 0,
+            })
+        }
+    }
+    
+    /// Perform ioctl operation
+    pub fn ioctl(&self, cmd: u32, arg: usize) -> Result<isize> {
+        if let Some(ref ops) = self.f_op {
+            ops.ioctl(self, cmd, arg)
+        } else {
+            Err(Error::ENOTTY)
+        }
+    }
+    
+    /// Memory map file
+    pub fn mmap(&self, vma: &mut crate::memory::VmaArea) -> Result<()> {
+        if let Some(ref ops) = self.f_op {
+            ops.mmap(self, vma)
+        } else {
+            Err(Error::ENODEV)
+        }
+    }
+    
+    /// Sync file to storage
+    pub fn fsync(&self, datasync: bool) -> Result<()> {
+        if let Some(ref ops) = self.f_op {
+            ops.fsync(self, datasync)
+        } else {
+            Ok(()) // No-op for files without sync
+        }
+    }
+    
+    /// Poll file for events
+    pub fn poll(&self, wait: &mut super::PollWait) -> Result<u32> {
+        if let Some(ref ops) = self.f_op {
+            ops.poll(self, wait)
+        } else {
+            Ok(super::POLLIN | super::POLLOUT) // Always ready
+        }
+    }
+    
+    /// Get current file position
+    pub fn get_pos(&self) -> i64 {
+        self.pos.load(Ordering::Relaxed)
+    }
+    
+    /// Set file position
+    pub fn set_pos(&self, pos: i64) {
+        self.pos.store(pos, Ordering::Relaxed);
+    }
+    
+    /// Get file flags
+    pub fn get_flags(&self) -> u32 {
+        self.flags.load(Ordering::Relaxed)
+    }
+    
+    /// Check if file is readable
+    pub fn is_readable(&self) -> bool {
+        let flags = self.get_flags();
+        (flags & super::flags::O_ACCMODE) != super::flags::O_WRONLY
+    }
+    
+    /// Check if file is writable
+    pub fn is_writable(&self) -> bool {
+        let flags = self.get_flags();
+        (flags & super::flags::O_ACCMODE) != super::flags::O_RDONLY
+    }
+    
+    /// Increment reference count
+    pub fn get_file(&self) -> Result<()> {
+        self.refcount.fetch_add(1, Ordering::Relaxed);
+        Ok(())
+    }
+    
+    /// Decrement reference count (fput equivalent)
+    pub fn put_file(&self) -> Result<()> {
+        let old_count = self.refcount.fetch_sub(1, Ordering::Relaxed);
+        if old_count == 1 {
+            // Last reference, file should be cleaned up
+            // TODO: Call release operation if present
+        }
+        Ok(())
+    }
+}
+
+unsafe impl Send for File {}
+unsafe impl Sync for File {}
+
+/// File operations trait - similar to Linux file_operations
+pub trait FileOperations: Send + Sync {
+    /// Read from file
+    fn read(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize>;
+    
+    /// Write to file
+    fn write(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize>;
+    
+    /// Seek within file
+    fn seek(&self, file: &File, offset: i64, whence: i32) -> Result<i64>;
+    
+    /// I/O control
+    fn ioctl(&self, file: &File, cmd: u32, arg: usize) -> Result<isize>;
+    
+    /// Memory map
+    fn mmap(&self, file: &File, vma: &mut crate::memory::VmaArea) -> Result<()>;
+    
+    /// Sync file
+    fn fsync(&self, file: &File, datasync: bool) -> Result<()>;
+    
+    /// Poll for events
+    fn poll(&self, file: &File, wait: &mut super::PollWait) -> Result<u32>;
+    
+    /// Open file (optional)
+    fn open(&self, inode: &super::Inode, file: &File) -> Result<()> {
+        Ok(())
+    }
+    
+    /// Release file (optional)
+    fn release(&self, inode: &super::Inode, file: &File) -> Result<()> {
+        Ok(())
+    }
+    
+    /// Flush file (optional)
+    fn flush(&self, file: &File) -> Result<()> {
+        Ok(())
+    }
+    
+    /// Lock file (optional)
+    fn lock(&self, file: &File, cmd: i32) -> Result<()> {
+        Err(Error::ENOSYS)
+    }
+    
+    /// Read directory entries (optional)
+    fn readdir(&self, file: &File, ctx: &mut super::DirContext) -> Result<()> {
+        Err(Error::ENOTDIR)
+    }
+}
+
+/// Directory context for readdir operations
+pub struct DirContext {
+    /// Current position in directory
+    pub pos: i64,
+    /// Entries collected so far
+    pub entries: alloc::vec::Vec<super::DirEntry>,
+}
+
+impl DirContext {
+    pub fn new(pos: i64) -> Self {
+        Self {
+            pos,
+            entries: alloc::vec::Vec::new(),
+        }
+    }
+    
+    /// Add a directory entry
+    pub fn add_entry(&mut self, ino: u64, name: &str, d_type: u8) {
+        let entry = super::DirEntry {
+            ino,
+            off: self.pos,
+            reclen: (core::mem::size_of::<super::DirEntry>() + name.len() + 1) as u16,
+            name: String::from(name),
+            d_type,
+        };
+        self.entries.push(entry);
+        self.pos += 1;
+    }
+}

kernel/src/fs/inode.rs

@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Inode abstraction - Linux compatible
+
+use crate::error::{Error, Result};
+use crate::types::*;
+use crate::sync::{Arc, Mutex, RwLock};
+use crate::device::DeviceNumber;
+use crate::time::{TimeSpec, get_current_time};
+use alloc::string::String;
+use core::sync::atomic::{AtomicU32, AtomicU64, Ordering};
+
+/// Inode structure - similar to Linux struct inode
+pub struct Inode {
+    /// Inode number
+    pub i_ino: u64,
+    /// File mode and type
+    pub i_mode: AtomicU32,
+    /// Number of hard links
+    pub i_nlink: AtomicU32,
+    /// User ID
+    pub i_uid: AtomicU32,
+    /// Group ID
+    pub i_gid: AtomicU32,
+    /// Device number (for device files)
+    pub i_rdev: DeviceNumber,
+    /// File size
+    pub i_size: AtomicU64,
+    /// Block size
+    pub i_blksize: u32,
+    /// Number of blocks
+    pub i_blocks: AtomicU64,
+    /// Access time
+    pub i_atime: Mutex<TimeSpec>,
+    /// Modification time
+    pub i_mtime: Mutex<TimeSpec>,
+    /// Status change time
+    pub i_ctime: Mutex<TimeSpec>,
+    /// Inode operations
+    pub i_op: Option<Arc<dyn InodeOperations>>,
+    /// File operations (for regular files)
+    pub i_fop: Option<Arc<dyn super::FileOperations>>,
+    /// Superblock this inode belongs to
+    pub i_sb: Option<Arc<super::SuperBlock>>,
+    /// Private data
+    pub private_data: Option<*mut u8>,
+    /// Reference count
+    pub refcount: AtomicU32,
+    /// Inode flags
+    pub i_flags: AtomicU32,
+}
+
+impl Inode {
+    /// Create a new inode
+    pub fn new(ino: u64, mode: u32) -> Self {
+        let now = get_current_time();
+        Self {
+            i_ino: ino,
+            i_mode: AtomicU32::new(mode),
+            i_nlink: AtomicU32::new(1),
+            i_uid: AtomicU32::new(0),
+            i_gid: AtomicU32::new(0),
+            i_rdev: DeviceNumber::new(0, 0),
+            i_size: AtomicU64::new(0),
+            i_blksize: 4096,
+            i_blocks: AtomicU64::new(0),
+            i_atime: Mutex::new(now),
+            i_mtime: Mutex::new(now),
+            i_ctime: Mutex::new(now),
+            i_op: None,
+            i_fop: None,
+            i_sb: None,
+            private_data: None,
+            refcount: AtomicU32::new(1),
+            i_flags: AtomicU32::new(0),
+        }
+    }
+    
+    /// Set inode operations
+    pub fn set_operations(&mut self, ops: Arc<dyn InodeOperations>) {
+        self.i_op = Some(ops);
+    }
+    
+    /// Set file operations
+    pub fn set_file_operations(&mut self, ops: Arc<dyn super::FileOperations>) {
+        self.i_fop = Some(ops);
+    }
+    
+    /// Get file statistics
+    pub fn stat(&self) -> Result<super::KStat> {
+        let atime = self.i_atime.lock();
+        let mtime = self.i_mtime.lock();
+        let ctime = self.i_ctime.lock();
+        
+        Ok(super::KStat {
+            st_dev: if let Some(ref sb) = self.i_sb {
+                sb.s_dev.as_raw()
+            } else {
+                0
+            },
+            st_ino: self.i_ino,
+            st_nlink: self.i_nlink.load(Ordering::Relaxed) as u64,
+            st_mode: self.i_mode.load(Ordering::Relaxed),
+            st_uid: self.i_uid.load(Ordering::Relaxed),
+            st_gid: self.i_gid.load(Ordering::Relaxed),
+            st_rdev: self.i_rdev.as_raw(),
+            st_size: self.i_size.load(Ordering::Relaxed) as i64,
+            st_blksize: self.i_blksize as u64,
+            st_blocks: self.i_blocks.load(Ordering::Relaxed),
+            st_atime: atime.sec,
+            st_atime_nsec: atime.nsec,
+            st_mtime: mtime.sec,
+            st_mtime_nsec: mtime.nsec,
+            st_ctime: ctime.sec,
+            st_ctime_nsec: ctime.nsec,
+        })
+    }
+    
+    /// Check if inode is a regular file
+    pub fn is_regular(&self) -> bool {
+        let mode = self.i_mode.load(Ordering::Relaxed);
+        super::mode::s_isreg(mode)
+    }
+    
+    /// Check if inode is a directory
+    pub fn is_directory(&self) -> bool {
+        let mode = self.i_mode.load(Ordering::Relaxed);
+        super::mode::s_isdir(mode)
+    }
+    
+    /// Check if inode is a character device
+    pub fn is_char_device(&self) -> bool {
+        let mode = self.i_mode.load(Ordering::Relaxed);
+        super::mode::s_ischr(mode)
+    }
+    
+    /// Check if inode is a block device
+    pub fn is_block_device(&self) -> bool {
+        let mode = self.i_mode.load(Ordering::Relaxed);
+        super::mode::s_isblk(mode)
+    }
+    
+    /// Update access time
+    pub fn update_atime(&self) {
+        let mut atime = self.i_atime.lock();
+        *atime = get_current_time();
+    }
+    
+    /// Update modification time
+    pub fn update_mtime(&self) {
+        let mut mtime = self.i_mtime.lock();
+        *mtime = get_current_time();
+    }
+    
+    /// Update status change time
+    pub fn update_ctime(&self) {
+        let mut ctime = self.i_ctime.lock();
+        *ctime = get_current_time();
+    }
+    
+    /// Set file size
+    pub fn set_size(&self, size: u64) {
+        self.i_size.store(size, Ordering::Relaxed);
+        self.update_mtime();
+        self.update_ctime();
+    }
+    
+    /// Get file size
+    pub fn get_size(&self) -> u64 {
+        self.i_size.load(Ordering::Relaxed)
+    }
+    
+    /// Increment reference count
+    pub fn iget(&self) {
+        self.refcount.fetch_add(1, Ordering::Relaxed);
+    }
+    
+    /// Decrement reference count
+    pub fn iput(&self) {
+        let old_count = self.refcount.fetch_sub(1, Ordering::Relaxed);
+        if old_count == 1 {
+            // Last reference, inode should be cleaned up
+            // TODO: Call destroy_inode operation if present
+        }
+    }
+    
+    /// Create a new file in this directory
+    pub fn create(&self, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        if let Some(ref ops) = self.i_op {
+            ops.create(self, name, mode)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+    
+    /// Look up a file in this directory
+    pub fn lookup(&self, name: &str) -> Result<Arc<Inode>> {
+        if let Some(ref ops) = self.i_op {
+            ops.lookup(self, name)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+    
+    /// Create a directory
+    pub fn mkdir(&self, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        if let Some(ref ops) = self.i_op {
+            ops.mkdir(self, name, mode)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+    
+    /// Remove a file
+    pub fn unlink(&self, name: &str) -> Result<()> {
+        if let Some(ref ops) = self.i_op {
+            ops.unlink(self, name)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+    
+    /// Remove a directory
+    pub fn rmdir(&self, name: &str) -> Result<()> {
+        if let Some(ref ops) = self.i_op {
+            ops.rmdir(self, name)
+        } else {
+            Err(Error::ENOSYS)
+        }
+    }
+}
+
+unsafe impl Send for Inode {}
+unsafe impl Sync for Inode {}
+
+/// Inode operations trait - similar to Linux inode_operations
+pub trait InodeOperations: Send + Sync {
+    /// Look up a file in directory
+    fn lookup(&self, dir: &Inode, name: &str) -> Result<Arc<Inode>>;
+    
+    /// Create a new file
+    fn create(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>>;
+    
+    /// Create a directory
+    fn mkdir(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>>;
+    
+    /// Remove a file
+    fn unlink(&self, dir: &Inode, name: &str) -> Result<()>;
+    
+    /// Remove a directory
+    fn rmdir(&self, dir: &Inode, name: &str) -> Result<()>;
+    
+    /// Create a symbolic link
+    fn symlink(&self, dir: &Inode, name: &str, target: &str) -> Result<Arc<Inode>>;
+    
+    /// Rename a file
+    fn rename(&self, old_dir: &Inode, old_name: &str, new_dir: &Inode, new_name: &str) -> Result<()>;
+    
+    /// Set attributes
+    fn setattr(&self, inode: &Inode, attr: &InodeAttr) -> Result<()>;
+    
+    /// Get attributes
+    fn getattr(&self, inode: &Inode) -> Result<InodeAttr>;
+    
+    /// Read symbolic link
+    fn readlink(&self, inode: &Inode) -> Result<String>;
+    
+    /// Follow symbolic link
+    fn follow_link(&self, inode: &Inode) -> Result<Arc<Inode>>;
+    
+    /// Truncate file
+    fn truncate(&self, inode: &Inode, size: u64) -> Result<()>;
+    
+    /// Get extended attribute
+    fn getxattr(&self, inode: &Inode, name: &str) -> Result<alloc::vec::Vec<u8>>;
+    
+    /// Set extended attribute
+    fn setxattr(&self, inode: &Inode, name: &str, value: &[u8], flags: u32) -> Result<()>;
+    
+    /// List extended attributes
+    fn listxattr(&self, inode: &Inode) -> Result<alloc::vec::Vec<String>>;
+    
+    /// Remove extended attribute
+    fn removexattr(&self, inode: &Inode, name: &str) -> Result<()>;
+}
+
+/// Inode attributes structure
+#[derive(Debug, Clone, Copy)]
+pub struct InodeAttr {
+    pub mode: Option<u32>,
+    pub uid: Option<u32>,
+    pub gid: Option<u32>,
+    pub size: Option<u64>,
+    pub atime: Option<TimeSpec>,
+    pub mtime: Option<TimeSpec>,
+    pub ctime: Option<TimeSpec>,
+}
+
+impl InodeAttr {
+    pub fn new() -> Self {
+        Self {
+            mode: None,
+            uid: None,
+            gid: None,
+            size: None,
+            atime: None,
+            mtime: None,
+            ctime: None,
+        }
+    }
+    
+    pub fn with_mode(mut self, mode: u32) -> Self {
+        self.mode = Some(mode);
+        self
+    }
+    
+    pub fn with_size(mut self, size: u64) -> Self {
+        self.size = Some(size);
+        self
+    }
+}
+
+/// Generic inode operations for simple filesystems
+pub struct GenericInodeOps;
+
+impl InodeOperations for GenericInodeOps {
+    fn lookup(&self, dir: &Inode, name: &str) -> Result<Arc<Inode>> {
+        Err(Error::ENOENT)
+    }
+    
+    fn create(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn mkdir(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn unlink(&self, dir: &Inode, name: &str) -> Result<()> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn rmdir(&self, dir: &Inode, name: &str) -> Result<()> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn symlink(&self, dir: &Inode, name: &str, target: &str) -> Result<Arc<Inode>> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn rename(&self, old_dir: &Inode, old_name: &str, new_dir: &Inode, new_name: &str) -> Result<()> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn setattr(&self, inode: &Inode, attr: &InodeAttr) -> Result<()> {
+        // Apply basic attributes
+        if let Some(mode) = attr.mode {
+            inode.i_mode.store(mode, Ordering::Relaxed);
+        }
+        if let Some(uid) = attr.uid {
+            inode.i_uid.store(uid, Ordering::Relaxed);
+        }
+        if let Some(gid) = attr.gid {
+            inode.i_gid.store(gid, Ordering::Relaxed);
+        }
+        if let Some(size) = attr.size {
+            inode.set_size(size);
+        }
+        if let Some(atime) = attr.atime {
+            *inode.i_atime.lock() = atime;
+        }
+        if let Some(mtime) = attr.mtime {
+            *inode.i_mtime.lock() = mtime;
+        }
+        if let Some(ctime) = attr.ctime {
+            *inode.i_ctime.lock() = ctime;
+        }
+        Ok(())
+    }
+    
+    fn getattr(&self, inode: &Inode) -> Result<InodeAttr> {
+        Ok(InodeAttr {
+            mode: Some(inode.i_mode.load(Ordering::Relaxed)),
+            uid: Some(inode.i_uid.load(Ordering::Relaxed)),
+            gid: Some(inode.i_gid.load(Ordering::Relaxed)),
+            size: Some(inode.i_size.load(Ordering::Relaxed)),
+            atime: Some(*inode.i_atime.lock()),
+            mtime: Some(*inode.i_mtime.lock()),
+            ctime: Some(*inode.i_ctime.lock()),
+        })
+    }
+    
+    fn readlink(&self, inode: &Inode) -> Result<String> {
+        Err(Error::EINVAL)
+    }
+    
+    fn follow_link(&self, inode: &Inode) -> Result<Arc<Inode>> {
+        Err(Error::EINVAL)
+    }
+    
+    fn truncate(&self, inode: &Inode, size: u64) -> Result<()> {
+        inode.set_size(size);
+        Ok(())
+    }
+    
+    fn getxattr(&self, inode: &Inode, name: &str) -> Result<alloc::vec::Vec<u8>> {
+        Err(Error::ENODATA)
+    }
+    
+    fn setxattr(&self, inode: &Inode, name: &str, value: &[u8], flags: u32) -> Result<()> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn listxattr(&self, inode: &Inode) -> Result<alloc::vec::Vec<String>> {
+        Ok(alloc::vec::Vec::new())
+    }
+    
+    fn removexattr(&self, inode: &Inode, name: &str) -> Result<()> {
+        Err(Error::ENODATA)
+    }
+}

kernel/src/fs/mod.rs

@@ -0,0 +1,407 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Virtual File System (VFS) - Linux compatible
+//!
+//! This module provides the core filesystem abstractions and compatibility
+//! with Linux VFS operations.
+
+pub mod file;
+pub mod inode;
+pub mod dentry;
+pub mod super_block;
+pub mod mount;
+pub mod path;
+pub mod operations;
+pub mod ramfs;
+pub mod procfs;
+pub mod devfs;
+
+use crate::error::{Error, Result};
+use crate::types::*;
+use crate::sync::{Arc, Mutex, RwLock};
+use crate::memory::{UserPtr, UserSlicePtr};
+use crate::device::DeviceNumber;
+use alloc::vec::Vec;
+use alloc::string::String;
+use alloc::collections::BTreeMap;
+use core::fmt;
+
+pub use file::*;
+pub use inode::*;
+pub use dentry::*;
+pub use super_block::*;
+pub use mount::*;
+pub use path::*;
+pub use operations::*;
+
+/// File access modes - Linux compatible
+pub mod flags {
+    pub const O_ACCMODE: u32 = 0o00000003;
+    pub const O_RDONLY: u32 = 0o00000000;
+    pub const O_WRONLY: u32 = 0o00000001;
+    pub const O_RDWR: u32 = 0o00000002;
+    pub const O_CREAT: u32 = 0o00000100;
+    pub const O_EXCL: u32 = 0o00000200;
+    pub const O_NOCTTY: u32 = 0o00000400;
+    pub const O_TRUNC: u32 = 0o00001000;
+    pub const O_APPEND: u32 = 0o00002000;
+    pub const O_NONBLOCK: u32 = 0o00004000;
+    pub const O_DSYNC: u32 = 0o00010000;
+    pub const O_FASYNC: u32 = 0o00020000;
+    pub const O_DIRECT: u32 = 0o00040000;
+    pub const O_LARGEFILE: u32 = 0o00100000;
+    pub const O_DIRECTORY: u32 = 0o00200000;
+    pub const O_NOFOLLOW: u32 = 0o00400000;
+    pub const O_NOATIME: u32 = 0o01000000;
+    pub const O_CLOEXEC: u32 = 0o02000000;
+    pub const O_SYNC: u32 = 0o04000000 | O_DSYNC;
+    pub const O_PATH: u32 = 0o10000000;
+    pub const O_TMPFILE: u32 = 0o20000000 | O_DIRECTORY;
+}
+
+/// File mode constants - Linux compatible
+pub mod mode {
+    pub const S_IFMT: u32 = 0o170000;
+    pub const S_IFSOCK: u32 = 0o140000;
+    pub const S_IFLNK: u32 = 0o120000;
+    pub const S_IFREG: u32 = 0o100000;
+    pub const S_IFBLK: u32 = 0o060000;
+    pub const S_IFDIR: u32 = 0o040000;
+    pub const S_IFCHR: u32 = 0o020000;
+    pub const S_IFIFO: u32 = 0o010000;
+    
+    pub const S_ISUID: u32 = 0o004000;
+    pub const S_ISGID: u32 = 0o002000;
+    pub const S_ISVTX: u32 = 0o001000;
+    
+    pub const S_IRWXU: u32 = 0o000700;
+    pub const S_IRUSR: u32 = 0o000400;
+    pub const S_IWUSR: u32 = 0o000200;
+    pub const S_IXUSR: u32 = 0o000100;
+    
+    pub const S_IRWXG: u32 = 0o000070;
+    pub const S_IRGRP: u32 = 0o000040;
+    pub const S_IWGRP: u32 = 0o000020;
+    pub const S_IXGRP: u32 = 0o000010;
+    
+    pub const S_IRWXO: u32 = 0o000007;
+    pub const S_IROTH: u32 = 0o000004;
+    pub const S_IWOTH: u32 = 0o000002;
+    pub const S_IXOTH: u32 = 0o000001;
+}
+
+/// File type helper functions
+impl mode {
+    pub fn s_isreg(mode: u32) -> bool {
+        (mode & S_IFMT) == S_IFREG
+    }
+    
+    pub fn s_isdir(mode: u32) -> bool {
+        (mode & S_IFMT) == S_IFDIR
+    }
+    
+    pub fn s_ischr(mode: u32) -> bool {
+        (mode & S_IFMT) == S_IFCHR
+    }
+    
+    pub fn s_isblk(mode: u32) -> bool {
+        (mode & S_IFMT) == S_IFBLK
+    }
+    
+    pub fn s_isfifo(mode: u32) -> bool {
+        (mode & S_IFMT) == S_IFIFO
+    }
+    
+    pub fn s_islnk(mode: u32) -> bool {
+        (mode & S_IFMT) == S_IFLNK
+    }
+    
+    pub fn s_issock(mode: u32) -> bool {
+        (mode & S_IFMT) == S_IFSOCK
+    }
+}
+
+/// Seek constants
+pub const SEEK_SET: i32 = 0;
+pub const SEEK_CUR: i32 = 1;
+pub const SEEK_END: i32 = 2;
+pub const SEEK_DATA: i32 = 3;
+pub const SEEK_HOLE: i32 = 4;
+
+/// Maximum filename length
+pub const NAME_MAX: usize = 255;
+
+/// Maximum path length
+pub const PATH_MAX: usize = 4096;
+
+/// File system statistics structure
+#[repr(C)]
+#[derive(Debug, Clone, Copy)]
+pub struct KStatFs {
+    pub f_type: u64,
+    pub f_bsize: u64,
+    pub f_blocks: u64,
+    pub f_bfree: u64,
+    pub f_bavail: u64,
+    pub f_files: u64,
+    pub f_ffree: u64,
+    pub f_fsid: [u32; 2],
+    pub f_namelen: u64,
+    pub f_frsize: u64,
+    pub f_flags: u64,
+    pub f_spare: [u64; 4],
+}
+
+/// File attributes structure
+#[repr(C)]
+#[derive(Debug, Clone, Copy)]
+pub struct KStat {
+    pub st_dev: u64,
+    pub st_ino: u64,
+    pub st_nlink: u64,
+    pub st_mode: u32,
+    pub st_uid: u32,
+    pub st_gid: u32,
+    pub st_rdev: u64,
+    pub st_size: i64,
+    pub st_blksize: u64,
+    pub st_blocks: u64,
+    pub st_atime: i64,
+    pub st_atime_nsec: i64,
+    pub st_mtime: i64,
+    pub st_mtime_nsec: i64,
+    pub st_ctime: i64,
+    pub st_ctime_nsec: i64,
+}
+
+/// I/O vector for scatter-gather I/O
+#[repr(C)]
+#[derive(Debug, Clone, Copy)]
+pub struct IoVec {
+    pub iov_base: *mut u8,
+    pub iov_len: usize,
+}
+
+/// Directory entry type returned by readdir
+#[derive(Debug, Clone)]
+pub struct DirEntry {
+    pub ino: u64,
+    pub off: i64,
+    pub reclen: u16,
+    pub name: String,
+    pub d_type: u8,
+}
+
+/// Directory entry types
+pub const DT_UNKNOWN: u8 = 0;
+pub const DT_FIFO: u8 = 1;
+pub const DT_CHR: u8 = 2;
+pub const DT_DIR: u8 = 4;
+pub const DT_BLK: u8 = 6;
+pub const DT_REG: u8 = 8;
+pub const DT_LNK: u8 = 10;
+pub const DT_SOCK: u8 = 12;
+pub const DT_WHT: u8 = 14;
+
+/// Global VFS state
+static VFS: Mutex<Vfs> = Mutex::new(Vfs::new());
+
+/// Virtual File System state
+pub struct Vfs {
+    /// Mounted filesystems
+    pub mounts: Vec<Arc<VfsMount>>,
+    /// Root dentry
+    pub root: Option<Arc<Dentry>>,
+    /// File descriptor table (per-process will be separate)
+    pub fd_table: BTreeMap<i32, Arc<File>>,
+    /// Next file descriptor number
+    pub next_fd: i32,
+}
+
+impl Vfs {
+    const fn new() -> Self {
+        Self {
+            mounts: Vec::new(),
+            root: None,
+            fd_table: BTreeMap::new(),
+            next_fd: 0,
+        }
+    }
+    
+    /// Mount a filesystem
+    pub fn mount(
+        &mut self,
+        source: &str,
+        target: &str,
+        fstype: &str,
+        flags: u32,
+        data: Option<&str>,
+    ) -> Result<()> {
+        // TODO: Implement proper mount logic
+        // For now, just create a basic mount
+        let sb = Arc::new(SuperBlock::new(fstype)?);
+        let mount = Arc::new(VfsMount::new(sb, target, flags)?);
+        self.mounts.push(mount);
+        Ok(())
+    }
+    
+    /// Allocate a new file descriptor
+    pub fn alloc_fd(&mut self) -> i32 {
+        let fd = self.next_fd;
+        self.next_fd += 1;
+        fd
+    }
+    
+    /// Install a file into the file descriptor table
+    pub fn install_fd(&mut self, fd: i32, file: Arc<File>) {
+        self.fd_table.insert(fd, file);
+    }
+    
+    /// Get a file by file descriptor
+    pub fn get_file(&self, fd: i32) -> Option<Arc<File>> {
+        self.fd_table.get(&fd).cloned()
+    }
+    
+    /// Close a file descriptor
+    pub fn close_fd(&mut self, fd: i32) -> Result<()> {
+        self.fd_table.remove(&fd);
+        Ok(())
+    }
+}
+
+/// Initialize the VFS subsystem
+pub fn init() -> Result<()> {
+    // Register built-in filesystems
+    ramfs::register_ramfs()?;
+    procfs::register_procfs()?;
+    devfs::register_devfs()?;
+    
+    // Create initial mounts
+    mount::do_mount("none", "/", "ramfs", 0, None)?;
+    
+    // Create essential directories
+    // TODO: Create /proc and /dev directories in root filesystem
+    
+    mount::do_mount("proc", "/proc", "proc", 0, None)?;
+    mount::do_mount("devfs", "/dev", "devfs", 0, None)?;
+    
+    crate::console::print_info("VFS: Initialized virtual file system\n");
+    Ok(())
+}
+
+/// Open a file - Linux compatible sys_open
+pub fn open(pathname: &str, flags: i32, mode: u32) -> Result<i32> {
+    let mut vfs = VFS.lock();
+    
+    // TODO: Path resolution, permission checks, etc.
+    // For now, create a simple file
+    let file = Arc::new(File::new(pathname, flags as u32, mode)?);
+    let fd = vfs.alloc_fd();
+    vfs.install_fd(fd, file);
+    
+    Ok(fd)
+}
+
+/// Close a file descriptor - Linux compatible sys_close
+pub fn close(fd: i32) -> Result<()> {
+    let mut vfs = VFS.lock();
+    vfs.close_fd(fd)
+}
+
+/// Read from a file descriptor - Linux compatible sys_read
+pub fn read(fd: i32, buf: UserSlicePtr, count: usize) -> Result<isize> {
+    let vfs = VFS.lock();
+    let file = vfs.get_file(fd).ok_or(Error::EBADF)?;
+    drop(vfs);
+    
+    file.read(buf, count)
+}
+
+/// Write to a file descriptor - Linux compatible sys_write
+pub fn write(fd: i32, buf: UserSlicePtr, count: usize) -> Result<isize> {
+    let vfs = VFS.lock();
+    let file = vfs.get_file(fd).ok_or(Error::EBADF)?;
+    drop(vfs);
+    
+    file.write(buf, count)
+}
+
+/// Seek within a file - Linux compatible sys_lseek
+pub fn lseek(fd: i32, offset: i64, whence: i32) -> Result<i64> {
+    let vfs = VFS.lock();
+    let file = vfs.get_file(fd).ok_or(Error::EBADF)?;
+    drop(vfs);
+    
+    file.seek(offset, whence)
+}
+
+/// Get file status - Linux compatible sys_fstat
+pub fn fstat(fd: i32, statbuf: UserPtr<KStat>) -> Result<()> {
+    let vfs = VFS.lock();
+    let file = vfs.get_file(fd).ok_or(Error::EBADF)?;
+    drop(vfs);
+    
+    let stat = file.stat()?;
+    statbuf.write(stat)?;
+    Ok(())
+}
+
+/// Generic file operations for simple filesystems
+pub struct GenericFileOps;
+
+impl FileOperations for GenericFileOps {
+    fn read(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Default read implementation
+        Ok(0)
+    }
+    
+    fn write(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Default write implementation  
+        Ok(count as isize)
+    }
+    
+    fn seek(&self, file: &File, offset: i64, whence: i32) -> Result<i64> {
+        // Default seek implementation
+        match whence {
+            SEEK_SET => Ok(offset),
+            SEEK_CUR => Ok(file.pos.load(core::sync::atomic::Ordering::Relaxed) + offset),
+            SEEK_END => Ok(offset), // TODO: Get file size
+            _ => Err(Error::EINVAL),
+        }
+    }
+    
+    fn ioctl(&self, file: &File, cmd: u32, arg: usize) -> Result<isize> {
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, file: &File, vma: &mut crate::memory::VmaArea) -> Result<()> {
+        Err(Error::ENODEV)
+    }
+    
+    fn fsync(&self, file: &File, datasync: bool) -> Result<()> {
+        Ok(())
+    }
+    
+    fn poll(&self, file: &File, wait: &mut PollWait) -> Result<u32> {
+        Ok(POLLIN | POLLOUT)
+    }
+}
+
+/// Poll events
+pub const POLLIN: u32 = 0x001;
+pub const POLLPRI: u32 = 0x002;
+pub const POLLOUT: u32 = 0x004;
+pub const POLLERR: u32 = 0x008;
+pub const POLLHUP: u32 = 0x010;
+pub const POLLNVAL: u32 = 0x020;
+
+/// Poll wait structure (simplified)
+pub struct PollWait {
+    // TODO: Implement proper poll/select mechanism
+}
+
+impl PollWait {
+    pub fn new() -> Self {
+        Self {}
+    }
+}

kernel/src/fs/mount.rs

@@ -0,0 +1,295 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! VFS mount abstraction - Linux compatible
+
+use crate::error::{Error, Result};
+use crate::sync::{Arc, Mutex, RwLock};
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::sync::atomic::{AtomicU32, Ordering};
+
+/// VFS mount structure - similar to Linux struct vfsmount
+pub struct VfsMount {
+    /// Mounted superblock
+    pub mnt_sb: Arc<super::SuperBlock>,
+    /// Mount point path
+    pub mnt_mountpoint: String,
+    /// Mount flags
+    pub mnt_flags: AtomicU32,
+    /// Parent mount
+    pub mnt_parent: Option<Arc<VfsMount>>,
+    /// Child mounts
+    pub mnt_children: Mutex<Vec<Arc<VfsMount>>>,
+    /// Reference count
+    pub mnt_count: AtomicU32,
+    /// Device name
+    pub mnt_devname: Option<String>,
+    /// Mount options
+    pub mnt_opts: Option<String>,
+}
+
+impl VfsMount {
+    /// Create a new VFS mount
+    pub fn new(sb: Arc<super::SuperBlock>, mountpoint: &str, flags: u32) -> Result<Self> {
+        Ok(Self {
+            mnt_sb: sb,
+            mnt_mountpoint: String::from(mountpoint),
+            mnt_flags: AtomicU32::new(flags),
+            mnt_parent: None,
+            mnt_children: Mutex::new(Vec::new()),
+            mnt_count: AtomicU32::new(1),
+            mnt_devname: None,
+            mnt_opts: None,
+        })
+    }
+    
+    /// Set parent mount
+    pub fn set_parent(&mut self, parent: Arc<VfsMount>) {
+        self.mnt_parent = Some(parent);
+    }
+    
+    /// Add child mount
+    pub fn add_child(&self, child: Arc<VfsMount>) {
+        let mut children = self.mnt_children.lock();
+        children.push(child);
+    }
+    
+    /// Get mount flags
+    pub fn get_flags(&self) -> u32 {
+        self.mnt_flags.load(Ordering::Relaxed)
+    }
+    
+    /// Check if mount is read-only
+    pub fn is_readonly(&self) -> bool {
+        (self.get_flags() & super::super_block::MS_RDONLY) != 0
+    }
+    
+    /// Check if mount is nosuid
+    pub fn is_nosuid(&self) -> bool {
+        (self.get_flags() & super::super_block::MS_NOSUID) != 0
+    }
+    
+    /// Check if mount is nodev
+    pub fn is_nodev(&self) -> bool {
+        (self.get_flags() & super::super_block::MS_NODEV) != 0
+    }
+    
+    /// Check if mount is noexec
+    pub fn is_noexec(&self) -> bool {
+        (self.get_flags() & super::super_block::MS_NOEXEC) != 0
+    }
+    
+    /// Increment reference count
+    pub fn mntget(&self) {
+        self.mnt_count.fetch_add(1, Ordering::Relaxed);
+    }
+    
+    /// Decrement reference count
+    pub fn mntput(&self) {
+        let old_count = self.mnt_count.fetch_sub(1, Ordering::Relaxed);
+        if old_count == 1 {
+            // Last reference, mount should be cleaned up
+            // TODO: Unmount filesystem
+        }
+    }
+    
+    /// Get full mount path
+    pub fn get_path(&self) -> String {
+        if let Some(ref parent) = self.mnt_parent {
+            if parent.mnt_mountpoint == "/" {
+                self.mnt_mountpoint.clone()
+            } else {
+                format!("{}{}", parent.get_path(), self.mnt_mountpoint)
+            }
+        } else {
+            self.mnt_mountpoint.clone()
+        }
+    }
+    
+    /// Find child mount by path
+    pub fn find_child_mount(&self, path: &str) -> Option<Arc<VfsMount>> {
+        let children = self.mnt_children.lock();
+        for child in children.iter() {
+            if child.mnt_mountpoint == path {
+                return Some(child.clone());
+            }
+        }
+        None
+    }
+}
+
+unsafe impl Send for VfsMount {}
+unsafe impl Sync for VfsMount {}
+
+/// Mount namespace - similar to Linux struct mnt_namespace
+pub struct MountNamespace {
+    /// Root mount
+    pub root: Option<Arc<VfsMount>>,
+    /// All mounts in this namespace
+    pub mounts: Mutex<Vec<Arc<VfsMount>>>,
+    /// Namespace ID
+    pub ns_id: u64,
+    /// Reference count
+    pub count: AtomicU32,
+}
+
+impl MountNamespace {
+    /// Create a new mount namespace
+    pub fn new(ns_id: u64) -> Self {
+        Self {
+            root: None,
+            mounts: Mutex::new(Vec::new()),
+            ns_id,
+            count: AtomicU32::new(1),
+        }
+    }
+    
+    /// Add mount to namespace
+    pub fn add_mount(&self, mount: Arc<VfsMount>) {
+        let mut mounts = self.mounts.lock();
+        mounts.push(mount);
+    }
+    
+    /// Remove mount from namespace
+    pub fn remove_mount(&self, mountpoint: &str) -> Option<Arc<VfsMount>> {
+        let mut mounts = self.mounts.lock();
+        if let Some(pos) = mounts.iter().position(|m| m.mnt_mountpoint == mountpoint) {
+            Some(mounts.remove(pos))
+        } else {
+            None
+        }
+    }
+    
+    /// Find mount by path
+    pub fn find_mount(&self, path: &str) -> Option<Arc<VfsMount>> {
+        let mounts = self.mounts.lock();
+        
+        // Find the longest matching mount point
+        let mut best_match: Option<Arc<VfsMount>> = None;
+        let mut best_len = 0;
+        
+        for mount in mounts.iter() {
+            let mount_path = mount.get_path();
+            if path.starts_with(&mount_path) && mount_path.len() > best_len {
+                best_match = Some(mount.clone());
+                best_len = mount_path.len();
+            }
+        }
+        
+        best_match
+    }
+    
+    /// Get all mount points
+    pub fn get_mount_points(&self) -> Vec<String> {
+        let mounts = self.mounts.lock();
+        mounts.iter().map(|m| m.get_path()).collect()
+    }
+    
+    /// Set root mount
+    pub fn set_root(&mut self, root: Arc<VfsMount>) {
+        self.root = Some(root.clone());
+        self.add_mount(root);
+    }
+}
+
+/// Global mount namespace
+static INIT_MNT_NS: once_cell::sync::Lazy<Mutex<MountNamespace>> = 
+    once_cell::sync::Lazy::new(|| Mutex::new(MountNamespace::new(1)));
+
+/// Get the init mount namespace
+pub fn get_init_ns() -> &'static Mutex<MountNamespace> {
+    &INIT_MNT_NS
+}
+
+/// Mount a filesystem
+pub fn do_mount(
+    dev_name: &str,
+    dir_name: &str,
+    type_name: &str,
+    flags: u32,
+    data: Option<&str>,
+) -> Result<()> {
+    // TODO: Look up filesystem type
+    // For now, create a basic mount
+    let sb = Arc::new(super::SuperBlock::new(type_name)?);
+    let mount = Arc::new(VfsMount::new(sb, dir_name, flags)?);
+    
+    let ns = get_init_ns();
+    let mut ns = ns.lock();
+    ns.add_mount(mount);
+    
+    crate::console::print_info(&format!("Mounted {} on {} (type {})\n", dev_name, dir_name, type_name));
+    Ok(())
+}
+
+/// Unmount a filesystem
+pub fn do_umount(dir_name: &str, flags: u32) -> Result<()> {
+    let ns = get_init_ns();
+    let mut ns = ns.lock();
+    
+    if let Some(mount) = ns.remove_mount(dir_name) {
+        mount.mntput();
+        crate::console::print_info(&format!("Unmounted {}\n", dir_name));
+        Ok(())
+    } else {
+        Err(Error::ENOENT)
+    }
+}
+
+/// Get mount information for a path
+pub fn path_get_mount(path: &str) -> Option<Arc<VfsMount>> {
+    let ns = get_init_ns();
+    let ns = ns.lock();
+    ns.find_mount(path)
+}
+
+/// Check if a path is a mount point
+pub fn is_mountpoint(path: &str) -> bool {
+    let ns = get_init_ns();
+    let ns = ns.lock();
+    let mounts = ns.mounts.lock();
+    mounts.iter().any(|m| m.get_path() == path)
+}
+
+/// Get all mount points
+pub fn get_all_mounts() -> Vec<String> {
+    let ns = get_init_ns();
+    let ns = ns.lock();
+    ns.get_mount_points()
+}
+
+/// Remount a filesystem with new flags
+pub fn do_remount(dir_name: &str, flags: u32, data: Option<&str>) -> Result<()> {
+    let ns = get_init_ns();
+    let ns = ns.lock();
+    
+    if let Some(mount) = ns.find_mount(dir_name) {
+        mount.mnt_flags.store(flags, Ordering::Relaxed);
+        
+        // Also remount the superblock
+        if let Some(ref ops) = mount.mnt_sb.s_op {
+            ops.remount_fs(&mount.mnt_sb, flags, data)?;
+        }
+        
+        crate::console::print_info(&format!("Remounted {} with flags {:#x}\n", dir_name, flags));
+        Ok(())
+    } else {
+        Err(Error::ENOENT)
+    }
+}
+
+/// Bind mount - create a bind mount
+pub fn do_bind_mount(old_path: &str, new_path: &str, flags: u32) -> Result<()> {
+    let ns = get_init_ns();
+    let mut ns = ns.lock();
+    
+    if let Some(old_mount) = ns.find_mount(old_path) {
+        let new_mount = Arc::new(VfsMount::new(old_mount.mnt_sb.clone(), new_path, flags | super::super_block::MS_BIND)?);
+        ns.add_mount(new_mount);
+        
+        crate::console::print_info(&format!("Bind mounted {} to {}\n", old_path, new_path));
+        Ok(())
+    } else {
+        Err(Error::ENOENT)
+    }
+}

kernel/src/fs/operations.rs

@@ -0,0 +1,419 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Various VFS operations and utilities
+
+use crate::error::{Error, Result};
+use crate::sync::Arc;
+use crate::memory::{UserPtr, UserSlicePtr};
+use alloc::string::String;
+use alloc::vec::Vec;
+
+/// Address space operations trait - similar to Linux address_space_operations
+pub trait AddressSpaceOperations: Send + Sync {
+    /// Write a page
+    fn writepage(&self, page: &crate::memory::Page) -> Result<()>;
+    
+    /// Read a page
+    fn readpage(&self, file: Option<&super::File>, page: &crate::memory::Page) -> Result<()>;
+    
+    /// Sync pages
+    fn sync_page(&self, page: &crate::memory::Page) -> Result<()>;
+    
+    /// Write pages
+    fn writepages(&self, mapping: &AddressSpace, wbc: &WritebackControl) -> Result<()>;
+    
+    /// Set page dirty
+    fn set_page_dirty(&self, page: &crate::memory::Page) -> Result<bool>;
+    
+    /// Read pages ahead
+    fn readpages(&self, file: Option<&super::File>, pages: &[&crate::memory::Page]) -> Result<()>;
+    
+    /// Write begin
+    fn write_begin(&self, file: &super::File, pos: u64, len: u32) -> Result<()>;
+    
+    /// Write end
+    fn write_end(&self, file: &super::File, pos: u64, len: u32, copied: u32) -> Result<u32>;
+    
+    /// Direct I/O
+    fn direct_io(&self, file: &super::File, pos: u64, buf: UserSlicePtr, len: usize, write: bool) -> Result<isize>;
+}
+
+/// Address space structure
+pub struct AddressSpace {
+    /// Host inode
+    pub host: Option<Arc<super::Inode>>,
+    /// Address space operations
+    pub a_ops: Option<Arc<dyn AddressSpaceOperations>>,
+    /// Number of pages
+    pub nrpages: core::sync::atomic::AtomicUsize,
+    /// Flags
+    pub flags: core::sync::atomic::AtomicU32,
+    /// Private data
+    pub private_data: Option<*mut u8>,
+}
+
+impl AddressSpace {
+    pub fn new() -> Self {
+        Self {
+            host: None,
+            a_ops: None,
+            nrpages: core::sync::atomic::AtomicUsize::new(0),
+            flags: core::sync::atomic::AtomicU32::new(0),
+            private_data: None,
+        }
+    }
+}
+
+/// Writeback control structure
+pub struct WritebackControl {
+    pub start: u64,
+    pub end: u64,
+    pub sync_mode: WritebackSyncMode,
+    pub nr_to_write: u64,
+    pub tagged_writepages: bool,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum WritebackSyncMode {
+    None,
+    All,
+    Memory,
+}
+
+/// Generic file operations implementation
+pub struct GenericFileOperations;
+
+impl super::FileOperations for GenericFileOperations {
+    fn read(&self, file: &super::File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Generic read implementation using page cache
+        // TODO: Implement proper page cache read
+        Ok(0)
+    }
+    
+    fn write(&self, file: &super::File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Generic write implementation using page cache
+        // TODO: Implement proper page cache write
+        Ok(count as isize)
+    }
+    
+    fn seek(&self, file: &super::File, offset: i64, whence: i32) -> Result<i64> {
+        let current_pos = file.get_pos();
+        let new_pos = match whence {
+            super::SEEK_SET => offset,
+            super::SEEK_CUR => current_pos + offset,
+            super::SEEK_END => {
+                // Get file size from inode
+                if let Some(ref inode) = file.inode {
+                    inode.get_size() as i64 + offset
+                } else {
+                    offset
+                }
+            }
+            _ => return Err(Error::EINVAL),
+        };
+        
+        if new_pos < 0 {
+            return Err(Error::EINVAL);
+        }
+        
+        file.set_pos(new_pos);
+        Ok(new_pos)
+    }
+    
+    fn ioctl(&self, file: &super::File, cmd: u32, arg: usize) -> Result<isize> {
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, file: &super::File, vma: &mut crate::memory::VmaArea) -> Result<()> {
+        // Generic mmap implementation
+        // TODO: Implement proper memory mapping
+        Err(Error::ENODEV)
+    }
+    
+    fn fsync(&self, file: &super::File, datasync: bool) -> Result<()> {
+        // Sync file data to storage
+        if let Some(ref inode) = file.inode {
+            // TODO: Sync inode and data blocks
+        }
+        Ok(())
+    }
+    
+    fn poll(&self, file: &super::File, wait: &mut super::PollWait) -> Result<u32> {
+        // Regular files are always ready for I/O
+        Ok(super::POLLIN | super::POLLOUT)
+    }
+    
+    fn readdir(&self, file: &super::File, ctx: &mut super::file::DirContext) -> Result<()> {
+        // This shouldn't be called for regular files
+        Err(Error::ENOTDIR)
+    }
+}
+
+/// Directory file operations
+pub struct DirectoryOperations;
+
+impl super::FileOperations for DirectoryOperations {
+    fn read(&self, file: &super::File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Can't read directory as regular file
+        Err(Error::EISDIR)
+    }
+    
+    fn write(&self, file: &super::File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Can't write to directory as regular file
+        Err(Error::EISDIR)
+    }
+    
+    fn seek(&self, file: &super::File, offset: i64, whence: i32) -> Result<i64> {
+        // Directory seeking
+        match whence {
+            super::SEEK_SET => {
+                if offset < 0 {
+                    return Err(Error::EINVAL);
+                }
+                file.set_pos(offset);
+                Ok(offset)
+            }
+            super::SEEK_CUR => {
+                let new_pos = file.get_pos() + offset;
+                if new_pos < 0 {
+                    return Err(Error::EINVAL);
+                }
+                file.set_pos(new_pos);
+                Ok(new_pos)
+            }
+            super::SEEK_END => {
+                // Seek to end of directory
+                file.set_pos(i64::MAX);
+                Ok(i64::MAX)
+            }
+            _ => Err(Error::EINVAL),
+        }
+    }
+    
+    fn ioctl(&self, file: &super::File, cmd: u32, arg: usize) -> Result<isize> {
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, file: &super::File, vma: &mut crate::memory::VmaArea) -> Result<()> {
+        Err(Error::ENODEV)
+    }
+    
+    fn fsync(&self, file: &super::File, datasync: bool) -> Result<()> {
+        // Sync directory
+        Ok(())
+    }
+    
+    fn poll(&self, file: &super::File, wait: &mut super::PollWait) -> Result<u32> {
+        // Directories are always ready
+        Ok(super::POLLIN)
+    }
+    
+    fn readdir(&self, file: &super::File, ctx: &mut super::file::DirContext) -> Result<()> {
+        // Read directory entries
+        if let Some(ref inode) = file.inode {
+            if let Some(ref dentry) = file.dentry {
+                let subdirs = dentry.d_subdirs.lock();
+                for (i, child) in subdirs.iter().enumerate() {
+                    if i >= ctx.pos as usize {
+                        let d_type = if let Some(ref child_inode) = child.d_inode {
+                            let mode = child_inode.i_mode.load(core::sync::atomic::Ordering::Relaxed);
+                            if super::mode::s_isdir(mode) {
+                                super::DT_DIR
+                            } else if super::mode::s_isreg(mode) {
+                                super::DT_REG
+                            } else if super::mode::s_islnk(mode) {
+                                super::DT_LNK
+                            } else if super::mode::s_ischr(mode) {
+                                super::DT_CHR
+                            } else if super::mode::s_isblk(mode) {
+                                super::DT_BLK
+                            } else if super::mode::s_isfifo(mode) {
+                                super::DT_FIFO
+                            } else if super::mode::s_issock(mode) {
+                                super::DT_SOCK
+                            } else {
+                                super::DT_UNKNOWN
+                            }
+                        } else {
+                            super::DT_UNKNOWN
+                        };
+                        
+                        let ino = if let Some(ref child_inode) = child.d_inode {
+                            child_inode.i_ino
+                        } else {
+                            0
+                        };
+                        
+                        ctx.add_entry(ino, &child.d_name, d_type);
+                    }
+                }
+            }
+        }
+        Ok(())
+    }
+}
+
+/// Special file operations (for device files)
+pub struct SpecialFileOperations;
+
+impl super::FileOperations for SpecialFileOperations {
+    fn read(&self, file: &super::File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Delegate to device driver
+        if let Some(ref inode) = file.inode {
+            if inode.is_char_device() || inode.is_block_device() {
+                // TODO: Call device driver read function
+                return Ok(0);
+            }
+        }
+        Err(Error::ENODEV)
+    }
+    
+    fn write(&self, file: &super::File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        // Delegate to device driver
+        if let Some(ref inode) = file.inode {
+            if inode.is_char_device() || inode.is_block_device() {
+                // TODO: Call device driver write function
+                return Ok(count as isize);
+            }
+        }
+        Err(Error::ENODEV)
+    }
+    
+    fn seek(&self, file: &super::File, offset: i64, whence: i32) -> Result<i64> {
+        // Most device files don't support seeking
+        Err(Error::ESPIPE)
+    }
+    
+    fn ioctl(&self, file: &super::File, cmd: u32, arg: usize) -> Result<isize> {
+        // Delegate to device driver
+        if let Some(ref inode) = file.inode {
+            if inode.is_char_device() || inode.is_block_device() {
+                // TODO: Call device driver ioctl function
+                return Ok(0);
+            }
+        }
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, file: &super::File, vma: &mut crate::memory::VmaArea) -> Result<()> {
+        // Some device files support mmap
+        Err(Error::ENODEV)
+    }
+    
+    fn fsync(&self, file: &super::File, datasync: bool) -> Result<()> {
+        // Nothing to sync for device files
+        Ok(())
+    }
+    
+    fn poll(&self, file: &super::File, wait: &mut super::PollWait) -> Result<u32> {
+        // Delegate to device driver
+        if let Some(ref inode) = file.inode {
+            if inode.is_char_device() {
+                // TODO: Call device driver poll function
+                return Ok(super::POLLIN | super::POLLOUT);
+            }
+        }
+        Ok(0)
+    }
+}
+
+/// No-op address space operations
+pub struct NoOpAddressSpaceOps;
+
+impl AddressSpaceOperations for NoOpAddressSpaceOps {
+    fn writepage(&self, page: &crate::memory::Page) -> Result<()> {
+        Ok(())
+    }
+    
+    fn readpage(&self, file: Option<&super::File>, page: &crate::memory::Page) -> Result<()> {
+        Ok(())
+    }
+    
+    fn sync_page(&self, page: &crate::memory::Page) -> Result<()> {
+        Ok(())
+    }
+    
+    fn writepages(&self, mapping: &AddressSpace, wbc: &WritebackControl) -> Result<()> {
+        Ok(())
+    }
+    
+    fn set_page_dirty(&self, page: &crate::memory::Page) -> Result<bool> {
+        Ok(true)
+    }
+    
+    fn readpages(&self, file: Option<&super::File>, pages: &[&crate::memory::Page]) -> Result<()> {
+        Ok(())
+    }
+    
+    fn write_begin(&self, file: &super::File, pos: u64, len: u32) -> Result<()> {
+        Ok(())
+    }
+    
+    fn write_end(&self, file: &super::File, pos: u64, len: u32, copied: u32) -> Result<u32> {
+        Ok(copied)
+    }
+    
+    fn direct_io(&self, file: &super::File, pos: u64, buf: UserSlicePtr, len: usize, write: bool) -> Result<isize> {
+        if write {
+            Ok(len as isize)
+        } else {
+            Ok(0)
+        }
+    }
+}
+
+/// Helper functions for VFS operations
+
+/// Get file operations for an inode
+pub fn get_file_operations(inode: &super::Inode) -> Arc<dyn super::FileOperations> {
+    if let Some(ref fop) = inode.i_fop {
+        fop.clone()
+    } else {
+        let mode = inode.i_mode.load(core::sync::atomic::Ordering::Relaxed);
+        if super::mode::s_isreg(mode) {
+            Arc::new(GenericFileOperations)
+        } else if super::mode::s_isdir(mode) {
+            Arc::new(DirectoryOperations)
+        } else if super::mode::s_ischr(mode) || super::mode::s_isblk(mode) {
+            Arc::new(SpecialFileOperations)
+        } else {
+            Arc::new(super::GenericFileOps)
+        }
+    }
+}
+
+/// Check file permissions
+pub fn check_permissions(inode: &super::Inode, mask: u32) -> Result<()> {
+    // TODO: Implement proper permission checking
+    // For now, allow all operations
+    Ok(())
+}
+
+/// Update access time
+pub fn update_atime(inode: &super::Inode) {
+    inode.update_atime();
+}
+
+/// Update modification time
+pub fn update_mtime(inode: &super::Inode) {
+    inode.update_mtime();
+}
+
+/// Truncate file to specified size
+pub fn do_truncate(inode: &super::Inode, size: u64) -> Result<()> {
+    if let Some(ref ops) = inode.i_op {
+        ops.truncate(inode, size)
+    } else {
+        inode.set_size(size);
+        Ok(())
+    }
+}
+
+/// Notify directory change
+pub fn notify_change(inode: &super::Inode, attr: &super::inode::InodeAttr) -> Result<()> {
+    if let Some(ref ops) = inode.i_op {
+        ops.setattr(inode, attr)
+    } else {
+        Ok(())
+    }
+}

kernel/src/fs/path.rs

@@ -0,0 +1,391 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Path resolution and manipulation - Linux compatible
+
+use crate::error::{Error, Result};
+use crate::sync::Arc;
+use alloc::string::String;
+use alloc::vec::Vec;
+
+/// Path structure for path resolution
+#[derive(Debug, Clone)]
+pub struct Path {
+    /// Mount point
+    pub mnt: Option<Arc<super::VfsMount>>,
+    /// Dentry
+    pub dentry: Option<Arc<super::Dentry>>,
+}
+
+impl Path {
+    /// Create a new path
+    pub fn new() -> Self {
+        Self {
+            mnt: None,
+            dentry: None,
+        }
+    }
+    
+    /// Create path from mount and dentry
+    pub fn from_mount_dentry(mnt: Arc<super::VfsMount>, dentry: Arc<super::Dentry>) -> Self {
+        Self {
+            mnt: Some(mnt),
+            dentry: Some(dentry),
+        }
+    }
+    
+    /// Get the full path string
+    pub fn to_string(&self) -> String {
+        if let Some(ref dentry) = self.dentry {
+            dentry.get_path()
+        } else {
+            String::from("/")
+        }
+    }
+    
+    /// Check if path is absolute
+    pub fn is_absolute(&self) -> bool {
+        self.to_string().starts_with('/')
+    }
+    
+    /// Get parent path
+    pub fn parent(&self) -> Option<Path> {
+        if let Some(ref dentry) = self.dentry {
+            if let Some(ref parent) = dentry.d_parent {
+                Some(Path {
+                    mnt: self.mnt.clone(),
+                    dentry: Some(parent.clone()),
+                })
+            } else {
+                None
+            }
+        } else {
+            None
+        }
+    }
+    
+    /// Get filename component
+    pub fn filename(&self) -> Option<String> {
+        if let Some(ref dentry) = self.dentry {
+            Some(dentry.d_name.clone())
+        } else {
+            None
+        }
+    }
+    
+    /// Join with another path component
+    pub fn join(&self, component: &str) -> Result<Path> {
+        if let Some(ref dentry) = self.dentry {
+            if let Some(child) = dentry.find_child(component) {
+                Ok(Path {
+                    mnt: self.mnt.clone(),
+                    dentry: Some(child),
+                })
+            } else {
+                Err(Error::ENOENT)
+            }
+        } else {
+            Err(Error::ENOENT)
+        }
+    }
+}
+
+/// Path lookup flags
+pub const LOOKUP_FOLLOW: u32 = 0x0001;
+pub const LOOKUP_DIRECTORY: u32 = 0x0002;
+pub const LOOKUP_AUTOMOUNT: u32 = 0x0004;
+pub const LOOKUP_EMPTY: u32 = 0x0008;
+pub const LOOKUP_OPEN: u32 = 0x0010;
+pub const LOOKUP_CREATE: u32 = 0x0020;
+pub const LOOKUP_EXCL: u32 = 0x0040;
+pub const LOOKUP_RENAME_TARGET: u32 = 0x0080;
+
+/// Name data structure for path resolution
+pub struct NameData {
+    /// Path components
+    pub path: String,
+    /// Current position in path
+    pub pos: usize,
+    /// Lookup flags
+    pub flags: u32,
+    /// Root directory
+    pub root: Option<Path>,
+    /// Current working directory
+    pub pwd: Option<Path>,
+    /// Result path
+    pub result: Option<Path>,
+    /// Intent (for create/open operations)
+    pub intent: Option<Intent>,
+}
+
+/// Intent for path operations
+#[derive(Debug, Clone)]
+pub enum Intent {
+    Open {
+        flags: u32,
+        mode: u32,
+    },
+    Create {
+        mode: u32,
+    },
+    Lookup,
+}
+
+impl NameData {
+    /// Create new name data for path resolution
+    pub fn new(path: String, flags: u32) -> Self {
+        Self {
+            path,
+            pos: 0,
+            flags,
+            root: None,
+            pwd: None,
+            result: None,
+            intent: None,
+        }
+    }
+    
+    /// Set root directory
+    pub fn with_root(mut self, root: Path) -> Self {
+        self.root = Some(root);
+        self
+    }
+    
+    /// Set current working directory
+    pub fn with_pwd(mut self, pwd: Path) -> Self {
+        self.pwd = Some(pwd);
+        self
+    }
+    
+    /// Set intent
+    pub fn with_intent(mut self, intent: Intent) -> Self {
+        self.intent = Some(intent);
+        self
+    }
+    
+    /// Get next path component
+    pub fn next_component(&mut self) -> Option<String> {
+        if self.pos >= self.path.len() {
+            return None;
+        }
+        
+        // Skip leading slashes
+        while self.pos < self.path.len() && self.path.chars().nth(self.pos) == Some('/') {
+            self.pos += 1;
+        }
+        
+        if self.pos >= self.path.len() {
+            return None;
+        }
+        
+        // Find end of component
+        let start = self.pos;
+        while self.pos < self.path.len() && self.path.chars().nth(self.pos) != Some('/') {
+            self.pos += 1;
+        }
+        
+        Some(self.path[start..self.pos].to_string())
+    }
+    
+    /// Check if path is finished
+    pub fn is_finished(&self) -> bool {
+        self.pos >= self.path.len()
+    }
+}
+
+/// Resolve a path to a dentry
+pub fn path_lookup(pathname: &str, flags: u32) -> Result<Path> {
+    let mut nd = NameData::new(String::from(pathname), flags);
+    
+    // Set root directory (for now, use a dummy root)
+    // TODO: Get actual root from current process
+    
+    // Start from root or current directory
+    let mut current_path = if pathname.starts_with('/') {
+        // Absolute path - start from root
+        if let Some(root) = nd.root.clone() {
+            root
+        } else {
+            // Create dummy root path
+            Path::new()
+        }
+    } else {
+        // Relative path - start from current directory
+        if let Some(pwd) = nd.pwd.clone() {
+            pwd
+        } else {
+            // Create dummy current directory
+            Path::new()
+        }
+    };
+    
+    // Resolve each component
+    while let Some(component) = nd.next_component() {
+        match component.as_str() {
+            "." => {
+                // Current directory - no change
+                continue;
+            }
+            ".." => {
+                // Parent directory
+                if let Some(parent) = current_path.parent() {
+                    current_path = parent;
+                }
+                continue;
+            }
+            _ => {
+                // Regular component
+                current_path = current_path.join(&component)?;
+            }
+        }
+        
+        // Check for mount points
+        if let Some(mount) = super::mount::path_get_mount(&current_path.to_string()) {
+            current_path.mnt = Some(mount);
+        }
+        
+        // Handle symlinks if LOOKUP_FOLLOW is set
+        if (flags & LOOKUP_FOLLOW) != 0 {
+            if let Some(ref dentry) = current_path.dentry {
+                if let Some(ref inode) = dentry.d_inode {
+                    if super::mode::s_islnk(inode.i_mode.load(core::sync::atomic::Ordering::Relaxed)) {
+                        // TODO: Follow symbolic link
+                        // For now, just continue
+                    }
+                }
+            }
+        }
+    }
+    
+    nd.result = Some(current_path.clone());
+    Ok(current_path)
+}
+
+/// Resolve parent directory and filename
+pub fn path_parent_and_name(pathname: &str) -> Result<(Path, String)> {
+    let path = Path::new();
+    
+    // Split pathname into parent and filename
+    if let Some(last_slash) = pathname.rfind('/') {
+        let parent_path = &pathname[..last_slash];
+        let filename = &pathname[last_slash + 1..];
+        
+        if parent_path.is_empty() {
+            // Root directory
+            Ok((path, String::from(filename)))
+        } else {
+            let parent = path_lookup(parent_path, 0)?;
+            Ok((parent, String::from(filename)))
+        }
+    } else {
+        // No slash - filename in current directory
+        Ok((path, String::from(pathname)))
+    }
+}
+
+/// Normalize a path (remove . and .. components)
+pub fn normalize_path(path: &str) -> String {
+    let mut components = Vec::new();
+    
+    for component in path.split('/') {
+        match component {
+            "" | "." => {
+                // Skip empty and current directory components
+                continue;
+            }
+            ".." => {
+                // Parent directory - remove last component
+                components.pop();
+            }
+            _ => {
+                // Regular component
+                components.push(component);
+            }
+        }
+    }
+    
+    let result = components.join("/");
+    if path.starts_with('/') {
+        format!("/{}", result)
+    } else {
+        result
+    }
+}
+
+/// Check if a path is safe (no .. escapes)
+pub fn is_safe_path(path: &str) -> bool {
+    let normalized = normalize_path(path);
+    
+    // Check for .. at the beginning
+    if normalized.starts_with("..") {
+        return false;
+    }
+    
+    // Check for /../ sequences
+    if normalized.contains("/../") {
+        return false;
+    }
+    
+    true
+}
+
+/// Join two paths
+pub fn join_paths(base: &str, path: &str) -> String {
+    if path.starts_with('/') {
+        // Absolute path
+        String::from(path)
+    } else {
+        // Relative path
+        let base = base.trim_end_matches('/');
+        if base.is_empty() {
+            format!("/{}", path)
+        } else {
+            format!("{}/{}", base, path)
+        }
+    }
+}
+
+/// Get the directory part of a path
+pub fn dirname(path: &str) -> &str {
+    if let Some(last_slash) = path.rfind('/') {
+        if last_slash == 0 {
+            "/"
+        } else {
+            &path[..last_slash]
+        }
+    } else {
+        "."
+    }
+}
+
+/// Get the filename part of a path
+pub fn basename(path: &str) -> &str {
+    if let Some(last_slash) = path.rfind('/') {
+        &path[last_slash + 1..]
+    } else {
+        path
+    }
+}
+
+/// Get file extension
+pub fn extension(path: &str) -> Option<&str> {
+    let filename = basename(path);
+    if let Some(last_dot) = filename.rfind('.') {
+        if last_dot > 0 {
+            Some(&filename[last_dot + 1..])
+        } else {
+            None
+        }
+    } else {
+        None
+    }
+}
+
+/// Check if path is absolute
+pub fn is_absolute(path: &str) -> bool {
+    path.starts_with('/')
+}
+
+/// Check if path is relative
+pub fn is_relative(path: &str) -> bool {
+    !is_absolute(path)
+}

kernel/src/fs/procfs.rs

@@ -0,0 +1,488 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Proc filesystem implementation - Linux compatible
+
+use crate::error::{Error, Result};
+use crate::fs::*;
+use crate::sync::{Arc, Mutex};
+use crate::memory::UserSlicePtr;
+use alloc::string::String;
+use alloc::vec::Vec;
+use alloc::collections::BTreeMap;
+use alloc::format;
+use core::sync::atomic::{AtomicU64, Ordering};
+
+/// Proc filesystem entry
+pub struct ProcEntry {
+    /// Entry name
+    pub name: String,
+    /// Entry type
+    pub entry_type: ProcEntryType,
+    /// Mode
+    pub mode: u32,
+    /// Read function
+    pub read: Option<fn(&ProcEntry, &mut String) -> Result<()>>,
+    /// Write function
+    pub write: Option<fn(&ProcEntry, &str) -> Result<()>>,
+    /// Child entries (for directories)
+    pub children: Mutex<Vec<Arc<ProcEntry>>>,
+    /// Parent entry
+    pub parent: Option<Arc<ProcEntry>>,
+    /// Private data
+    pub private_data: Option<*mut u8>,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum ProcEntryType {
+    File,
+    Directory,
+    Symlink,
+}
+
+impl ProcEntry {
+    pub fn new_file(name: String, mode: u32, read_fn: fn(&ProcEntry, &mut String) -> Result<()>) -> Self {
+        Self {
+            name,
+            entry_type: ProcEntryType::File,
+            mode,
+            read: Some(read_fn),
+            write: None,
+            children: Mutex::new(Vec::new()),
+            parent: None,
+            private_data: None,
+        }
+    }
+    
+    pub fn new_dir(name: String, mode: u32) -> Self {
+        Self {
+            name,
+            entry_type: ProcEntryType::Directory,
+            mode,
+            read: None,
+            write: None,
+            children: Mutex::new(Vec::new()),
+            parent: None,
+            private_data: None,
+        }
+    }
+    
+    pub fn add_child(self: &Arc<Self>, child: Arc<ProcEntry>) {
+        let mut children = self.children.lock();
+        children.push(child);
+    }
+    
+    pub fn find_child(&self, name: &str) -> Option<Arc<ProcEntry>> {
+        let children = self.children.lock();
+        for child in children.iter() {
+            if child.name == name {
+                return Some(child.clone());
+            }
+        }
+        None
+    }
+}
+
+unsafe impl Send for ProcEntry {}
+unsafe impl Sync for ProcEntry {}
+
+/// Proc filesystem
+pub struct ProcFs {
+    /// Root entry
+    pub root: Arc<ProcEntry>,
+    /// Next inode number
+    next_ino: AtomicU64,
+    /// Entry to inode mapping
+    entries: Mutex<BTreeMap<*const ProcEntry, u64>>,
+}
+
+impl ProcFs {
+    pub fn new() -> Self {
+        let root = Arc::new(ProcEntry::new_dir(String::from("proc"), 0o755));
+        let mut fs = Self {
+            root,
+            next_ino: AtomicU64::new(1),
+            entries: Mutex::new(BTreeMap::new()),
+        };
+        
+        fs.create_default_entries();
+        fs
+    }
+    
+    fn alloc_ino(&self) -> u64 {
+        self.next_ino.fetch_add(1, Ordering::Relaxed)
+    }
+    
+    fn get_or_create_ino(&self, entry: &ProcEntry) -> u64 {
+        let entry_ptr = entry as *const ProcEntry;
+        let mut entries = self.entries.lock();
+        
+        if let Some(&ino) = entries.get(&entry_ptr) {
+            ino
+        } else {
+            let ino = self.alloc_ino();
+            entries.insert(entry_ptr, ino);
+            ino
+        }
+    }
+    
+    fn create_default_entries(&mut self) {
+        // Create /proc/version
+        let version_entry = Arc::new(ProcEntry::new_file(
+            String::from("version"),
+            0o444,
+            proc_version_read,
+        ));
+        self.root.add_child(version_entry);
+        
+        // Create /proc/meminfo
+        let meminfo_entry = Arc::new(ProcEntry::new_file(
+            String::from("meminfo"),
+            0o444,
+            proc_meminfo_read,
+        ));
+        self.root.add_child(meminfo_entry);
+        
+        // Create /proc/cpuinfo
+        let cpuinfo_entry = Arc::new(ProcEntry::new_file(
+            String::from("cpuinfo"),
+            0o444,
+            proc_cpuinfo_read,
+        ));
+        self.root.add_child(cpuinfo_entry);
+        
+        // Create /proc/uptime
+        let uptime_entry = Arc::new(ProcEntry::new_file(
+            String::from("uptime"),
+            0o444,
+            proc_uptime_read,
+        ));
+        self.root.add_child(uptime_entry);
+        
+        // Create /proc/loadavg
+        let loadavg_entry = Arc::new(ProcEntry::new_file(
+            String::from("loadavg"),
+            0o444,
+            proc_loadavg_read,
+        ));
+        self.root.add_child(loadavg_entry);
+        
+        // Create /proc/stat
+        let stat_entry = Arc::new(ProcEntry::new_file(
+            String::from("stat"),
+            0o444,
+            proc_stat_read,
+        ));
+        self.root.add_child(stat_entry);
+        
+        // Create /proc/mounts
+        let mounts_entry = Arc::new(ProcEntry::new_file(
+            String::from("mounts"),
+            0o444,
+            proc_mounts_read,
+        ));
+        self.root.add_child(mounts_entry);
+    }
+}
+
+/// Proc filesystem file operations
+pub struct ProcFileOps {
+    entry: Arc<ProcEntry>,
+}
+
+impl ProcFileOps {
+    pub fn new(entry: Arc<ProcEntry>) -> Self {
+        Self { entry }
+    }
+}
+
+impl FileOperations for ProcFileOps {
+    fn read(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        match self.entry.entry_type {
+            ProcEntryType::File => {
+                if let Some(read_fn) = self.entry.read {
+                    let mut content = String::new();
+                    read_fn(&self.entry, &mut content)?;
+                    
+                    let pos = file.get_pos() as usize;
+                    if pos >= content.len() {
+                        return Ok(0);
+                    }
+                    
+                    let to_copy = core::cmp::min(count, content.len() - pos);
+                    let data = &content.as_bytes()[pos..pos + to_copy];
+                    
+                    buf.copy_from_slice(data)?;
+                    file.set_pos(file.get_pos() + to_copy as i64);
+                    
+                    Ok(to_copy as isize)
+                } else {
+                    Ok(0)
+                }
+            }
+            _ => Err(Error::EISDIR),
+        }
+    }
+    
+    fn write(&self, file: &File, buf: UserSlicePtr, count: usize) -> Result<isize> {
+        if let Some(write_fn) = self.entry.write {
+            let mut data = vec![0u8; count];
+            buf.copy_to_slice(&mut data)?;
+            let content = String::from_utf8(data).map_err(|_| Error::EINVAL)?;
+            write_fn(&self.entry, &content)?;
+            Ok(count as isize)
+        } else {
+            Err(Error::EPERM)
+        }
+    }
+    
+    fn seek(&self, file: &File, offset: i64, whence: i32) -> Result<i64> {
+        let new_pos = match whence {
+            SEEK_SET => offset,
+            SEEK_CUR => file.get_pos() + offset,
+            SEEK_END => 0, // Proc files are typically small
+            _ => return Err(Error::EINVAL),
+        };
+        
+        if new_pos < 0 {
+            return Err(Error::EINVAL);
+        }
+        
+        file.set_pos(new_pos);
+        Ok(new_pos)
+    }
+    
+    fn ioctl(&self, file: &File, cmd: u32, arg: usize) -> Result<isize> {
+        Err(Error::ENOTTY)
+    }
+    
+    fn mmap(&self, file: &File, vma: &mut crate::memory::VmaArea) -> Result<()> {
+        Err(Error::ENODEV)
+    }
+    
+    fn fsync(&self, file: &File, datasync: bool) -> Result<()> {
+        Ok(())
+    }
+    
+    fn poll(&self, file: &File, wait: &mut PollWait) -> Result<u32> {
+        Ok(POLLIN | POLLOUT)
+    }
+}
+
+/// Proc filesystem inode operations
+pub struct ProcInodeOps {
+    fs: *const ProcFs,
+}
+
+impl ProcInodeOps {
+    pub fn new(fs: &ProcFs) -> Self {
+        Self {
+            fs: fs as *const ProcFs,
+        }
+    }
+    
+    fn get_fs(&self) -> &ProcFs {
+        unsafe { &*self.fs }
+    }
+}
+
+unsafe impl Send for ProcInodeOps {}
+unsafe impl Sync for ProcInodeOps {}
+
+impl InodeOperations for ProcInodeOps {
+    fn lookup(&self, dir: &Inode, name: &str) -> Result<Arc<Inode>> {
+        let fs = self.get_fs();
+        // Find the proc entry for this inode
+        // This is a simplified implementation
+        if let Some(child) = fs.root.find_child(name) {
+            let ino = fs.get_or_create_ino(&child);
+            let mode = match child.entry_type {
+                ProcEntryType::File => mode::S_IFREG | child.mode,
+                ProcEntryType::Directory => mode::S_IFDIR | child.mode,
+                ProcEntryType::Symlink => mode::S_IFLNK | child.mode,
+            };
+            
+            let mut inode = Inode::new(ino, mode);
+            inode.set_operations(Arc::new(ProcInodeOps::new(fs)));
+            inode.set_file_operations(Arc::new(ProcFileOps::new(child)));
+            
+            Ok(Arc::new(inode))
+        } else {
+            Err(Error::ENOENT)
+        }
+    }
+    
+    fn create(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        Err(Error::EPERM) // Proc filesystem is read-only
+    }
+    
+    fn mkdir(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        Err(Error::EPERM)
+    }
+    
+    fn unlink(&self, dir: &Inode, name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn rmdir(&self, dir: &Inode, name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn symlink(&self, dir: &Inode, name: &str, target: &str) -> Result<Arc<Inode>> {
+        Err(Error::EPERM)
+    }
+    
+    fn rename(&self, old_dir: &Inode, old_name: &str, new_dir: &Inode, new_name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn setattr(&self, inode: &Inode, attr: &InodeAttr) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn getattr(&self, inode: &Inode) -> Result<InodeAttr> {
+        let generic_ops = GenericInodeOps;
+        generic_ops.getattr(inode)
+    }
+    
+    fn readlink(&self, inode: &Inode) -> Result<String> {
+        Err(Error::EINVAL)
+    }
+    
+    fn follow_link(&self, inode: &Inode) -> Result<Arc<Inode>> {
+        Err(Error::EINVAL)
+    }
+    
+    fn truncate(&self, inode: &Inode, size: u64) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn getxattr(&self, inode: &Inode, name: &str) -> Result<Vec<u8>> {
+        Err(Error::ENODATA)
+    }
+    
+    fn setxattr(&self, inode: &Inode, name: &str, value: &[u8], flags: u32) -> Result<()> {
+        Err(Error::EPERM)
+    }
+    
+    fn listxattr(&self, inode: &Inode) -> Result<Vec<String>> {
+        Ok(Vec::new())
+    }
+    
+    fn removexattr(&self, inode: &Inode, name: &str) -> Result<()> {
+        Err(Error::EPERM)
+    }
+}
+
+// Proc file read functions
+
+fn proc_version_read(_entry: &ProcEntry, content: &mut String) -> Result<()> {
+    content.push_str(&format!("{} version {} ({})\n", 
+        crate::NAME, crate::VERSION, "rustc"));
+    Ok(())
+}
+
+fn proc_meminfo_read(_entry: &ProcEntry, content: &mut String) -> Result<()> {
+    // TODO: Get actual memory statistics
+    let total_mem = 128 * 1024; // 128 MB placeholder
+    let free_mem = 64 * 1024;   // 64 MB placeholder
+    
+    content.push_str(&format!(
+        "MemTotal:     {} kB\n\
+         MemFree:      {} kB\n\
+         MemAvailable: {} kB\n\
+         Buffers:      {} kB\n\
+         Cached:       {} kB\n",
+        total_mem, free_mem, free_mem, 0, 0
+    ));
+    Ok(())
+}
+
+fn proc_cpuinfo_read(_entry: &ProcEntry, content: &mut String) -> Result<()> {
+    // TODO: Get actual CPU information
+    content.push_str(
+        "processor\t: 0\n\
+         vendor_id\t: RustKernel\n\
+         cpu family\t: 1\n\
+         model\t\t: 1\n\
+         model name\t: Rust Kernel CPU\n\
+         stepping\t: 1\n\
+         microcode\t: 0x1\n\
+         cpu MHz\t\t: 1000.000\n\
+         cache size\t: 1024 KB\n\
+         flags\t\t: rust\n\n"
+    );
+    Ok(())
+}
+
+fn proc_uptime_read(_entry: &ProcEntry, content: &mut String) -> Result<()> {
+    // TODO: Get actual uptime
+    let uptime = 100.0; // 100 seconds placeholder
+    let idle = 90.0;    // 90 seconds idle placeholder
+    
+    content.push_str(&format!("{:.2} {:.2}\n", uptime, idle));
+    Ok(())
+}
+
+fn proc_loadavg_read(_entry: &ProcEntry, content: &mut String) -> Result<()> {
+    // TODO: Get actual load average
+    content.push_str("0.00 0.00 0.00 1/1 1\n");
+    Ok(())
+}
+
+fn proc_stat_read(_entry: &ProcEntry, content: &mut String) -> Result<()> {
+    // TODO: Get actual system statistics
+    content.push_str(
+        "cpu  0 0 0 1000 0 0 0 0 0 0\n\
+         cpu0 0 0 0 1000 0 0 0 0 0 0\n\
+         intr 0\n\
+         ctxt 0\n\
+         btime 0\n\
+         processes 1\n\
+         procs_running 1\n\
+         procs_blocked 0\n"
+    );
+    Ok(())
+}
+
+fn proc_mounts_read(_entry: &ProcEntry, content: &mut String) -> Result<()> {
+    // TODO: Get actual mount information
+    let mounts = crate::fs::mount::get_all_mounts();
+    for mount in mounts {
+        content.push_str(&format!("none {} ramfs rw 0 0\n", mount));
+    }
+    Ok(())
+}
+
+/// Mount proc filesystem
+pub fn mount_procfs(_dev_name: &str, _flags: u32, _data: Option<&str>) -> Result<Arc<SuperBlock>> {
+    let mut sb = SuperBlock::new("proc")?;
+    sb.s_magic = 0x9fa0; // PROC_SUPER_MAGIC
+    
+    let procfs = Box::leak(Box::new(ProcFs::new()));
+    sb.s_fs_info = Some(procfs as *mut ProcFs as *mut u8);
+    
+    // Create root inode
+    let root_inode = Arc::new({
+        let mut inode = Inode::new(1, mode::S_IFDIR | 0o755);
+        inode.set_operations(Arc::new(ProcInodeOps::new(procfs)));
+        inode
+    });
+    
+    let root_dentry = Arc::new(Dentry::new(String::from("/"), Some(root_inode)));
+    sb.s_root = Some(root_dentry);
+    
+    Ok(Arc::new(sb))
+}
+
+/// Register proc filesystem
+pub fn register_procfs() -> Result<()> {
+    let procfs_type = FileSystemType::new(
+        String::from("proc"),
+        |_fstype, flags, _dev_name, data| mount_procfs(_dev_name, flags, data),
+        |_sb| Ok(()),
+    );
+    
+    // TODO: Register with VFS
+    crate::console::print_info("Registered proc filesystem\n");
+    Ok(())
+}

kernel/src/fs/ramfs.rs

@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Simple RAM filesystem implementation
+
+use crate::error::{Error, Result};
+use crate::fs::*;
+use crate::sync::{Arc, Mutex};
+use alloc::string::String;
+use alloc::vec::Vec;
+use alloc::collections::BTreeMap;
+use core::sync::atomic::{AtomicU64, Ordering};
+
+/// RAM filesystem superblock
+pub struct RamFs {
+    /// Next inode number
+    next_ino: AtomicU64,
+    /// Inode storage
+    inodes: Mutex<BTreeMap<u64, Arc<Inode>>>,
+    /// Directory entries
+    entries: Mutex<BTreeMap<u64, Vec<Arc<Dentry>>>>,
+}
+
+impl RamFs {
+    pub fn new() -> Self {
+        Self {
+            next_ino: AtomicU64::new(1),
+            inodes: Mutex::new(BTreeMap::new()),
+            entries: Mutex::new(BTreeMap::new()),
+        }
+    }
+    
+    fn alloc_ino(&self) -> u64 {
+        self.next_ino.fetch_add(1, Ordering::Relaxed)
+    }
+    
+    fn create_inode(&self, mode: u32) -> Arc<Inode> {
+        let ino = self.alloc_ino();
+        let mut inode = Inode::new(ino, mode);
+        inode.set_operations(Arc::new(RamFsInodeOps::new(self)));
+        
+        let inode = Arc::new(inode);
+        
+        let mut inodes = self.inodes.lock();
+        inodes.insert(ino, inode.clone());
+        
+        if mode::s_isdir(mode) {
+            let mut entries = self.entries.lock();
+            entries.insert(ino, Vec::new());
+        }
+        
+        inode
+    }
+    
+    fn get_inode(&self, ino: u64) -> Option<Arc<Inode>> {
+        let inodes = self.inodes.lock();
+        inodes.get(&ino).cloned()
+    }
+    
+    fn add_entry(&self, dir_ino: u64, name: String, child_ino: u64) -> Result<()> {
+        let child_inode = self.get_inode(child_ino).ok_or(Error::ENOENT)?;
+        let dentry = Arc::new(Dentry::new(name, Some(child_inode)));
+        
+        let mut entries = self.entries.lock();
+        if let Some(dir_entries) = entries.get_mut(&dir_ino) {
+            dir_entries.push(dentry);
+            Ok(())
+        } else {
+            Err(Error::ENOTDIR)
+        }
+    }
+    
+    fn find_entry(&self, dir_ino: u64, name: &str) -> Option<Arc<Dentry>> {
+        let entries = self.entries.lock();
+        if let Some(dir_entries) = entries.get(&dir_ino) {
+            for entry in dir_entries {
+                if entry.d_name == name {
+                    return Some(entry.clone());
+                }
+            }
+        }
+        None
+    }
+    
+    fn remove_entry(&self, dir_ino: u64, name: &str) -> Result<()> {
+        let mut entries = self.entries.lock();
+        if let Some(dir_entries) = entries.get_mut(&dir_ino) {
+            if let Some(pos) = dir_entries.iter().position(|e| e.d_name == name) {
+                dir_entries.remove(pos);
+                Ok(())
+            } else {
+                Err(Error::ENOENT)
+            }
+        } else {
+            Err(Error::ENOTDIR)
+        }
+    }
+}
+
+/// RAM filesystem inode operations
+pub struct RamFsInodeOps {
+    fs: *const RamFs,
+}
+
+impl RamFsInodeOps {
+    fn new(fs: &RamFs) -> Self {
+        Self {
+            fs: fs as *const RamFs,
+        }
+    }
+    
+    fn get_fs(&self) -> &RamFs {
+        unsafe { &*self.fs }
+    }
+}
+
+unsafe impl Send for RamFsInodeOps {}
+unsafe impl Sync for RamFsInodeOps {}
+
+impl InodeOperations for RamFsInodeOps {
+    fn lookup(&self, dir: &Inode, name: &str) -> Result<Arc<Inode>> {
+        let fs = self.get_fs();
+        if let Some(entry) = fs.find_entry(dir.i_ino, name) {
+            if let Some(inode) = entry.d_inode {
+                Ok(inode)
+            } else {
+                Err(Error::ENOENT)
+            }
+        } else {
+            Err(Error::ENOENT)
+        }
+    }
+    
+    fn create(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        let fs = self.get_fs();
+        
+        // Check if entry already exists
+        if fs.find_entry(dir.i_ino, name).is_some() {
+            return Err(Error::EEXIST);
+        }
+        
+        let inode = fs.create_inode(mode | mode::S_IFREG);
+        fs.add_entry(dir.i_ino, String::from(name), inode.i_ino)?;
+        
+        Ok(inode)
+    }
+    
+    fn mkdir(&self, dir: &Inode, name: &str, mode: u32) -> Result<Arc<Inode>> {
+        let fs = self.get_fs();
+        
+        // Check if entry already exists
+        if fs.find_entry(dir.i_ino, name).is_some() {
+            return Err(Error::EEXIST);
+        }
+        
+        let inode = fs.create_inode(mode | mode::S_IFDIR);
+        fs.add_entry(dir.i_ino, String::from(name), inode.i_ino)?;
+        
+        // Add . and .. entries
+        fs.add_entry(inode.i_ino, String::from("."), inode.i_ino)?;
+        fs.add_entry(inode.i_ino, String::from(".."), dir.i_ino)?;
+        
+        Ok(inode)
+    }
+    
+    fn unlink(&self, dir: &Inode, name: &str) -> Result<()> {
+        let fs = self.get_fs();
+        fs.remove_entry(dir.i_ino, name)
+    }
+    
+    fn rmdir(&self, dir: &Inode, name: &str) -> Result<()> {
+        let fs = self.get_fs();
+        
+        // Check if directory is empty (only . and .. entries)
+        let entries = fs.entries.lock();
+        if let Some(target_inode) = fs.find_entry(dir.i_ino, name)
+            .and_then(|e| e.d_inode.clone()) {
+            if let Some(dir_entries) = entries.get(&target_inode.i_ino) {
+                if dir_entries.len() > 2 {
+                    return Err(Error::ENOTEMPTY);
+                }
+            }
+        }
+        drop(entries);
+        
+        fs.remove_entry(dir.i_ino, name)
+    }
+    
+    fn symlink(&self, dir: &Inode, name: &str, target: &str) -> Result<Arc<Inode>> {
+        let fs = self.get_fs();
+        
+        // Check if entry already exists
+        if fs.find_entry(dir.i_ino, name).is_some() {
+            return Err(Error::EEXIST);
+        }
+        
+        let inode = fs.create_inode(mode::S_IFLNK | 0o777);
+        // TODO: Store symlink target
+        fs.add_entry(dir.i_ino, String::from(name), inode.i_ino)?;
+        
+        Ok(inode)
+    }
+    
+    fn rename(&self, old_dir: &Inode, old_name: &str, new_dir: &Inode, new_name: &str) -> Result<()> {
+        let fs = self.get_fs();
+        
+        // Find the entry to rename
+        if let Some(entry) = fs.find_entry(old_dir.i_ino, old_name) {
+            // Remove from old location
+            fs.remove_entry(old_dir.i_ino, old_name)?;
+            
+            // Add to new location
+            if let Some(inode) = entry.d_inode {
+                fs.add_entry(new_dir.i_ino, String::from(new_name), inode.i_ino)?;
+            }
+            
+            Ok(())
+        } else {
+            Err(Error::ENOENT)
+        }
+    }
+    
+    fn setattr(&self, inode: &Inode, attr: &InodeAttr) -> Result<()> {
+        // Apply basic attributes using generic implementation
+        let generic_ops = GenericInodeOps;
+        generic_ops.setattr(inode, attr)
+    }
+    
+    fn getattr(&self, inode: &Inode) -> Result<InodeAttr> {
+        let generic_ops = GenericInodeOps;
+        generic_ops.getattr(inode)
+    }
+    
+    fn readlink(&self, inode: &Inode) -> Result<String> {
+        // TODO: Return stored symlink target
+        Err(Error::EINVAL)
+    }
+    
+    fn follow_link(&self, inode: &Inode) -> Result<Arc<Inode>> {
+        // TODO: Follow symlink to target
+        Err(Error::EINVAL)
+    }
+    
+    fn truncate(&self, inode: &Inode, size: u64) -> Result<()> {
+        inode.set_size(size);
+        Ok(())
+    }
+    
+    fn getxattr(&self, inode: &Inode, name: &str) -> Result<Vec<u8>> {
+        Err(Error::ENODATA)
+    }
+    
+    fn setxattr(&self, inode: &Inode, name: &str, value: &[u8], flags: u32) -> Result<()> {
+        Err(Error::ENOSYS)
+    }
+    
+    fn listxattr(&self, inode: &Inode) -> Result<Vec<String>> {
+        Ok(Vec::new())
+    }
+    
+    fn removexattr(&self, inode: &Inode, name: &str) -> Result<()> {
+        Err(Error::ENODATA)
+    }
+}
+
+/// Mount RAM filesystem
+pub fn mount_ramfs(_dev_name: &str, _flags: u32, _data: Option<&str>) -> Result<Arc<SuperBlock>> {
+    let mut sb = SuperBlock::new("ramfs")?;
+    sb.s_magic = 0x858458f6; // RAMFS magic
+    sb.set_operations(Arc::new(RamFsSuperOps));
+    
+    let ramfs = Box::leak(Box::new(RamFs::new()));
+    sb.s_fs_info = Some(ramfs as *mut RamFs as *mut u8);
+    
+    // Create root directory
+    let root_inode = ramfs.create_inode(mode::S_IFDIR | 0o755);
+    let root_dentry = Arc::new(Dentry::new(String::from("/"), Some(root_inode)));
+    
+    let sb = Arc::new(sb);
+    Ok(sb)
+}
+
+/// RAM filesystem superblock operations
+pub struct RamFsSuperOps;
+
+impl SuperOperations for RamFsSuperOps {
+    fn alloc_inode(&self, sb: &SuperBlock) -> Result<Arc<Inode>> {
+        let ramfs = unsafe { &*(sb.s_fs_info.unwrap() as *const RamFs) };
+        Ok(ramfs.create_inode(0o644))
+    }
+    
+    fn destroy_inode(&self, inode: &Inode) -> Result<()> {
+        Ok(())
+    }
+    
+    fn write_inode(&self, inode: &Inode, sync: bool) -> Result<()> {
+        // RAM filesystem doesn't need to write inodes
+        Ok(())
+    }
+    
+    fn delete_inode(&self, inode: &Inode) -> Result<()> {
+        Ok(())
+    }
+    
+    fn put_super(&self, sb: &SuperBlock) -> Result<()> {
+        if let Some(fs_info) = sb.s_fs_info {
+            unsafe {
+                let ramfs = Box::from_raw(fs_info as *mut RamFs);
+                drop(ramfs);
+            }
+        }
+        Ok(())
+    }
+    
+    fn write_super(&self, sb: &SuperBlock) -> Result<()> {
+        // Nothing to write for RAM filesystem
+        Ok(())
+    }
+    
+    fn sync_fs(&self, sb: &SuperBlock, wait: bool) -> Result<()> {
+        // Nothing to sync for RAM filesystem
+        Ok(())
+    }
+    
+    fn freeze_fs(&self, sb: &SuperBlock) -> Result<()> {
+        Ok(())
+    }
+    
+    fn unfreeze_fs(&self, sb: &SuperBlock) -> Result<()> {
+        Ok(())
+    }
+    
+    fn statfs(&self, sb: &SuperBlock) -> Result<KStatFs> {
+        Ok(KStatFs {
+            f_type: sb.s_magic as u64,
+            f_bsize: sb.s_blocksize as u64,
+            f_blocks: 0, // Unlimited
+            f_bfree: 0,  // Unlimited
+            f_bavail: 0, // Unlimited
+            f_files: 0,  // Dynamic
+            f_ffree: 0,  // Unlimited
+            f_fsid: [0, 0],
+            f_namelen: NAME_MAX as u64,
+            f_frsize: sb.s_blocksize as u64,
+            f_flags: 0,
+            f_spare: [0; 4],
+        })
+    }
+    
+    fn remount_fs(&self, sb: &SuperBlock, flags: u32, data: Option<&str>) -> Result<()> {
+        sb.s_flags.store(flags, Ordering::Relaxed);
+        Ok(())
+    }
+    
+    fn show_options(&self, sb: &SuperBlock) -> Result<String> {
+        Ok(String::new())
+    }
+}
+
+/// Kill RAM filesystem superblock
+pub fn kill_ramfs(sb: &SuperBlock) -> Result<()> {
+    if let Some(ref ops) = sb.s_op {
+        ops.put_super(sb)
+    } else {
+        Ok(())
+    }
+}
+
+/// Register RAM filesystem
+pub fn register_ramfs() -> Result<()> {
+    let ramfs_type = FileSystemType::new(
+        String::from("ramfs"),
+        |_fstype, flags, _dev_name, data| mount_ramfs(_dev_name, flags, data),
+        |sb| kill_ramfs(sb),
+    );
+    
+    // TODO: Register with VFS
+    crate::console::print_info("Registered ramfs filesystem\n");
+    Ok(())
+}

kernel/src/fs/super_block.rs

@@ -0,0 +1,349 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Superblock abstraction - Linux compatible
+
+use crate::error::{Error, Result};
+use crate::sync::{Arc, Mutex, RwLock};
+use crate::device::DeviceNumber;
+use alloc::string::String;
+use alloc::vec::Vec;
+use core::sync::atomic::{AtomicU32, AtomicU64, Ordering};
+
+/// Superblock structure - similar to Linux struct super_block
+pub struct SuperBlock {
+    /// Device number
+    pub s_dev: DeviceNumber,
+    /// Block size
+    pub s_blocksize: u32,
+    /// Block size bits
+    pub s_blocksize_bits: u8,
+    /// Maximum file size
+    pub s_maxbytes: u64,
+    /// File system type
+    pub s_type: Option<Arc<FileSystemType>>,
+    /// Superblock operations
+    pub s_op: Option<Arc<dyn SuperOperations>>,
+    /// Root dentry
+    pub s_root: Option<Arc<super::Dentry>>,
+    /// Mount point
+    pub s_mount: Option<Arc<super::VfsMount>>,
+    /// File system flags
+    pub s_flags: AtomicU32,
+    /// File system magic number
+    pub s_magic: u32,
+    /// List of inodes
+    pub s_inodes: Mutex<Vec<Arc<super::Inode>>>,
+    /// Next inode number
+    pub s_next_ino: AtomicU64,
+    /// Private data
+    pub s_fs_info: Option<*mut u8>,
+    /// Dirty inodes
+    pub s_dirty: Mutex<Vec<Arc<super::Inode>>>,
+    /// Reference count
+    pub s_count: AtomicU32,
+    /// File system name
+    pub s_id: String,
+}
+
+impl SuperBlock {
+    /// Create a new superblock
+    pub fn new(fstype: &str) -> Result<Self> {
+        Ok(Self {
+            s_dev: DeviceNumber::new(0, 0),
+            s_blocksize: 4096,
+            s_blocksize_bits: 12,
+            s_maxbytes: 0x7fffffffffffffff,
+            s_type: None,
+            s_op: None,
+            s_root: None,
+            s_mount: None,
+            s_flags: AtomicU32::new(0),
+            s_magic: 0,
+            s_inodes: Mutex::new(Vec::new()),
+            s_next_ino: AtomicU64::new(1),
+            s_fs_info: None,
+            s_dirty: Mutex::new(Vec::new()),
+            s_count: AtomicU32::new(1),
+            s_id: String::from(fstype),
+        })
+    }
+    
+    /// Set superblock operations
+    pub fn set_operations(&mut self, ops: Arc<dyn SuperOperations>) {
+        self.s_op = Some(ops);
+    }
+    
+    /// Allocate a new inode
+    pub fn alloc_inode(&self, mode: u32) -> Result<Arc<super::Inode>> {
+        let ino = self.s_next_ino.fetch_add(1, Ordering::Relaxed);
+        let mut inode = super::Inode::new(ino, mode);
+        inode.i_sb = Some(Arc::new(unsafe { 
+            // SAFETY: We're creating a weak reference to avoid cycles
+            core::ptr::read(self as *const Self)
+        }));
+        
+        let inode = Arc::new(inode);
+        
+        // Add to inode list
+        let mut inodes = self.s_inodes.lock();
+        inodes.push(inode.clone());
+        
+        Ok(inode)
+    }
+    
+    /// Write superblock to disk
+    pub fn write_super(&self) -> Result<()> {
+        if let Some(ref ops) = self.s_op {
+            ops.write_super(self)
+        } else {
+            Ok(())
+        }
+    }
+    
+    /// Put superblock (decrement reference count)
+    pub fn put_super(&self) -> Result<()> {
+        let old_count = self.s_count.fetch_sub(1, Ordering::Relaxed);
+        if old_count == 1 {
+            // Last reference, cleanup
+            if let Some(ref ops) = self.s_op {
+                ops.put_super(self)?;
+            }
+        }
+        Ok(())
+    }
+    
+    /// Get superblock statistics
+    pub fn statfs(&self) -> Result<super::KStatFs> {
+        if let Some(ref ops) = self.s_op {
+            ops.statfs(self)
+        } else {
+            // Default statistics
+            Ok(super::KStatFs {
+                f_type: self.s_magic as u64,
+                f_bsize: self.s_blocksize as u64,
+                f_blocks: 0,
+                f_bfree: 0,
+                f_bavail: 0,
+                f_files: 0,
+                f_ffree: 0,
+                f_fsid: [0, 0],
+                f_namelen: super::NAME_MAX as u64,
+                f_frsize: self.s_blocksize as u64,
+                f_flags: self.s_flags.load(Ordering::Relaxed) as u64,
+                f_spare: [0; 4],
+            })
+        }
+    }
+    
+    /// Sync filesystem
+    pub fn sync_fs(&self, wait: bool) -> Result<()> {
+        if let Some(ref ops) = self.s_op {
+            ops.sync_fs(self, wait)
+        } else {
+            Ok(())
+        }
+    }
+    
+    /// Freeze filesystem
+    pub fn freeze_fs(&self) -> Result<()> {
+        if let Some(ref ops) = self.s_op {
+            ops.freeze_fs(self)
+        } else {
+            Ok(())
+        }
+    }
+    
+    /// Unfreeze filesystem
+    pub fn unfreeze_fs(&self) -> Result<()> {
+        if let Some(ref ops) = self.s_op {
+            ops.unfreeze_fs(self)
+        } else {
+            Ok(())
+        }
+    }
+    
+    /// Mark inode as dirty
+    pub fn mark_dirty(&self, inode: Arc<super::Inode>) {
+        let mut dirty = self.s_dirty.lock();
+        dirty.push(inode);
+    }
+    
+    /// Write back dirty inodes
+    pub fn write_dirty(&self) -> Result<()> {
+        let mut dirty = self.s_dirty.lock();
+        for inode in dirty.drain(..) {
+            // TODO: Write inode to disk
+        }
+        Ok(())
+    }
+}
+
+unsafe impl Send for SuperBlock {}
+unsafe impl Sync for SuperBlock {}
+
+/// Superblock operations trait - similar to Linux super_operations
+pub trait SuperOperations: Send + Sync {
+    /// Allocate inode
+    fn alloc_inode(&self, sb: &SuperBlock) -> Result<Arc<super::Inode>>;
+    
+    /// Destroy inode
+    fn destroy_inode(&self, inode: &super::Inode) -> Result<()>;
+    
+    /// Write inode
+    fn write_inode(&self, inode: &super::Inode, sync: bool) -> Result<()>;
+    
+    /// Delete inode
+    fn delete_inode(&self, inode: &super::Inode) -> Result<()>;
+    
+    /// Put superblock
+    fn put_super(&self, sb: &SuperBlock) -> Result<()>;
+    
+    /// Write superblock
+    fn write_super(&self, sb: &SuperBlock) -> Result<()>;
+    
+    /// Sync filesystem
+    fn sync_fs(&self, sb: &SuperBlock, wait: bool) -> Result<()>;
+    
+    /// Freeze filesystem
+    fn freeze_fs(&self, sb: &SuperBlock) -> Result<()>;
+    
+    /// Unfreeze filesystem
+    fn unfreeze_fs(&self, sb: &SuperBlock) -> Result<()>;
+    
+    /// Get filesystem statistics
+    fn statfs(&self, sb: &SuperBlock) -> Result<super::KStatFs>;
+    
+    /// Remount filesystem
+    fn remount_fs(&self, sb: &SuperBlock, flags: u32, data: Option<&str>) -> Result<()>;
+    
+    /// Show mount options
+    fn show_options(&self, sb: &SuperBlock) -> Result<String>;
+}
+
+/// File system type structure - similar to Linux file_system_type
+pub struct FileSystemType {
+    /// File system name
+    pub name: String,
+    /// File system flags
+    pub fs_flags: u32,
+    /// Mount function
+    pub mount: fn(fstype: &FileSystemType, flags: u32, dev_name: &str, data: Option<&str>) -> Result<Arc<SuperBlock>>,
+    /// Kill superblock function
+    pub kill_sb: fn(sb: &SuperBlock) -> Result<()>,
+    /// Owner module
+    pub owner: Option<&'static str>,
+}
+
+impl FileSystemType {
+    /// Create a new file system type
+    pub fn new(
+        name: String,
+        mount: fn(&FileSystemType, u32, &str, Option<&str>) -> Result<Arc<SuperBlock>>,
+        kill_sb: fn(&SuperBlock) -> Result<()>,
+    ) -> Self {
+        Self {
+            name,
+            fs_flags: 0,
+            mount,
+            kill_sb,
+            owner: None,
+        }
+    }
+    
+    /// Mount this filesystem type
+    pub fn do_mount(&self, flags: u32, dev_name: &str, data: Option<&str>) -> Result<Arc<SuperBlock>> {
+        (self.mount)(self, flags, dev_name, data)
+    }
+    
+    /// Kill superblock
+    pub fn do_kill_sb(&self, sb: &SuperBlock) -> Result<()> {
+        (self.kill_sb)(sb)
+    }
+}
+
+/// Generic superblock operations
+pub struct GenericSuperOps;
+
+impl SuperOperations for GenericSuperOps {
+    fn alloc_inode(&self, sb: &SuperBlock) -> Result<Arc<super::Inode>> {
+        sb.alloc_inode(0o644)
+    }
+    
+    fn destroy_inode(&self, inode: &super::Inode) -> Result<()> {
+        Ok(())
+    }
+    
+    fn write_inode(&self, inode: &super::Inode, sync: bool) -> Result<()> {
+        Ok(())
+    }
+    
+    fn delete_inode(&self, inode: &super::Inode) -> Result<()> {
+        Ok(())
+    }
+    
+    fn put_super(&self, sb: &SuperBlock) -> Result<()> {
+        Ok(())
+    }
+    
+    fn write_super(&self, sb: &SuperBlock) -> Result<()> {
+        Ok(())
+    }
+    
+    fn sync_fs(&self, sb: &SuperBlock, wait: bool) -> Result<()> {
+        sb.write_dirty()
+    }
+    
+    fn freeze_fs(&self, sb: &SuperBlock) -> Result<()> {
+        Ok(())
+    }
+    
+    fn unfreeze_fs(&self, sb: &SuperBlock) -> Result<()> {
+        Ok(())
+    }
+    
+    fn statfs(&self, sb: &SuperBlock) -> Result<super::KStatFs> {
+        sb.statfs()
+    }
+    
+    fn remount_fs(&self, sb: &SuperBlock, flags: u32, data: Option<&str>) -> Result<()> {
+        sb.s_flags.store(flags, Ordering::Relaxed);
+        Ok(())
+    }
+    
+    fn show_options(&self, sb: &SuperBlock) -> Result<String> {
+        Ok(String::new())
+    }
+}
+
+/// File system flags
+pub const FS_REQUIRES_DEV: u32 = 1;
+pub const FS_BINARY_MOUNTDATA: u32 = 2;
+pub const FS_HAS_SUBTYPE: u32 = 4;
+pub const FS_USERNS_MOUNT: u32 = 8;
+pub const FS_DISALLOW_NOTIFY_PERM: u32 = 16;
+pub const FS_RENAME_DOES_D_MOVE: u32 = 32;
+
+/// Mount flags
+pub const MS_RDONLY: u32 = 1;
+pub const MS_NOSUID: u32 = 2;
+pub const MS_NODEV: u32 = 4;
+pub const MS_NOEXEC: u32 = 8;
+pub const MS_SYNCHRONOUS: u32 = 16;
+pub const MS_REMOUNT: u32 = 32;
+pub const MS_MANDLOCK: u32 = 64;
+pub const MS_DIRSYNC: u32 = 128;
+pub const MS_NOATIME: u32 = 1024;
+pub const MS_NODIRATIME: u32 = 2048;
+pub const MS_BIND: u32 = 4096;
+pub const MS_MOVE: u32 = 8192;
+pub const MS_REC: u32 = 16384;
+pub const MS_SILENT: u32 = 32768;
+pub const MS_POSIXACL: u32 = 1 << 16;
+pub const MS_UNBINDABLE: u32 = 1 << 17;
+pub const MS_PRIVATE: u32 = 1 << 18;
+pub const MS_SLAVE: u32 = 1 << 19;
+pub const MS_SHARED: u32 = 1 << 20;
+pub const MS_RELATIME: u32 = 1 << 21;
+pub const MS_KERNMOUNT: u32 = 1 << 22;
+pub const MS_I_VERSION: u32 = 1 << 23;
+pub const MS_STRICTATIME: u32 = 1 << 24;

kernel/src/init.rs

@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Kernel initialization
+
+use crate::error::Result;
+use crate::{info, error};
+
+/// Early kernel initialization
+pub fn early_init() {
+    info!("Starting Rust Kernel v{}", crate::VERSION);
+    info!("Early initialization phase");
+    
+    // Initialize basic console output
+    if let Err(e) = crate::console::init() {
+        // Can't print error since console isn't initialized yet
+        loop {}
+    }
+    
+    info!("Console initialized");
+}
+
+/// Main kernel initialization  
+pub fn main_init() -> ! {
+    info!("Main initialization phase");
+    
+    // Initialize memory management
+    if let Err(e) = crate::memory::init() {
+        error!("Failed to initialize memory management: {}", e);
+        panic!("Memory initialization failed");
+    }
+    info!("Memory management initialized");
+    
+    // Initialize interrupt handling
+    if let Err(e) = crate::interrupt::init() {
+        error!("Failed to initialize interrupts: {}", e);
+        panic!("Interrupt initialization failed");
+    }
+    info!("Interrupt handling initialized");
+    
+    // Initialize scheduler
+    if let Err(e) = crate::scheduler::init() {
+        error!("Failed to initialize scheduler: {}", e);
+        panic!("Scheduler initialization failed");
+    }
+    info!("Scheduler initialized");
+    
+    // Initialize device subsystem
+    if let Err(e) = crate::device::init() {
+        error!("Failed to initialize devices: {}", e);
+        panic!("Device initialization failed");
+    }
+    info!("Device subsystem initialized");
+    
+    // Initialize VFS (Virtual File System)
+    if let Err(e) = crate::fs::init() {
+        error!("Failed to initialize VFS: {}", e);
+        panic!("VFS initialization failed");
+    }
+    info!("VFS initialized");
+    
+    info!("Kernel initialization completed");
+    info!("Starting idle loop");
+    
+    // Start the idle loop
+    idle_loop();
+}
+
+/// Kernel idle loop
+fn idle_loop() -> ! {
+    loop {
+        // TODO: Power management - halt CPU until interrupt
+        #[cfg(target_arch = "x86_64")]
+        unsafe {
+            core::arch::asm!("hlt");
+        }
+        
+        #[cfg(not(target_arch = "x86_64"))]
+        core::hint::spin_loop();
+        
+        // TODO: Check for scheduled tasks
+        // TODO: Handle background tasks
+    }
+}

kernel/src/interrupt.rs

@@ -0,0 +1,388 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Interrupt handling compatible with Linux kernel
+
+use crate::error::{Error, Result};
+use crate::sync::Spinlock;
+use crate::types::Irq;
+use alloc::{vec::Vec, collections::BTreeMap};
+use core::fmt;
+
+/// IRQ flags - compatible with Linux kernel
+pub mod irq_flags {
+    pub const IRQF_SHARED: u32 = 0x00000080;
+    pub const IRQF_TRIGGER_NONE: u32 = 0x00000000;
+    pub const IRQF_TRIGGER_RISING: u32 = 0x00000001;
+    pub const IRQF_TRIGGER_FALLING: u32 = 0x00000002;
+    pub const IRQF_TRIGGER_HIGH: u32 = 0x00000004;
+    pub const IRQF_TRIGGER_LOW: u32 = 0x00000008;
+    pub const IRQF_ONESHOT: u32 = 0x00002000;
+    pub const IRQF_NO_SUSPEND: u32 = 0x00004000;
+    pub const IRQF_FORCE_RESUME: u32 = 0x00008000;
+    pub const IRQF_NO_THREAD: u32 = 0x00010000;
+    pub const IRQF_EARLY_RESUME: u32 = 0x00020000;
+    pub const IRQF_COND_SUSPEND: u32 = 0x00040000;
+}
+
+/// Interrupt return values - Linux compatible
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum IrqReturn {
+    None,      // IRQ_NONE
+    Handled,   // IRQ_HANDLED
+    WakeThread, // IRQ_WAKE_THREAD
+}
+
+impl fmt::Display for IrqReturn {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            IrqReturn::None => write!(f, "IRQ_NONE"),
+            IrqReturn::Handled => write!(f, "IRQ_HANDLED"),
+            IrqReturn::WakeThread => write!(f, "IRQ_WAKE_THREAD"),
+        }
+    }
+}
+
+/// Interrupt handler function type - Linux compatible
+pub type IrqHandler = fn(irq: u32, dev_id: *mut u8) -> IrqReturn;
+
+/// Interrupt action structure - similar to Linux irqaction
+#[derive(Debug)]
+pub struct IrqAction {
+    pub handler: IrqHandler,
+    pub flags: u32,
+    pub name: &'static str,
+    pub dev_id: *mut u8,
+    pub next: Option<Box<IrqAction>>,
+}
+
+impl IrqAction {
+    pub fn new(handler: IrqHandler, flags: u32, name: &'static str, dev_id: *mut u8) -> Self {
+        Self {
+            handler,
+            flags,
+            name,
+            dev_id,
+            next: None,
+        }
+    }
+}
+
+/// Interrupt descriptor - similar to Linux irq_desc
+#[derive(Debug)]
+pub struct IrqDescriptor {
+    pub irq: u32,
+    pub action: Option<Box<IrqAction>>,
+    pub depth: u32,      // nesting depth for disable/enable
+    pub wake_depth: u32, // wake nesting depth
+    pub irq_count: u64,  // number of interrupts
+    pub irqs_unhandled: u64, // number of unhandled interrupts
+    pub name: &'static str,
+    pub status: u32,
+}
+
+impl IrqDescriptor {
+    pub fn new(irq: u32, name: &'static str) -> Self {
+        Self {
+            irq,
+            action: None,
+            depth: 1, // starts disabled
+            wake_depth: 0,
+            irq_count: 0,
+            irqs_unhandled: 0,
+            name,
+            status: 0,
+        }
+    }
+    
+    pub fn is_enabled(&self) -> bool {
+        self.depth == 0
+    }
+    
+    pub fn enable(&mut self) {
+        if self.depth > 0 {
+            self.depth -= 1;
+        }
+    }
+    
+    pub fn disable(&mut self) {
+        self.depth += 1;
+    }
+}
+
+/// Global interrupt subsystem
+static INTERRUPT_SUBSYSTEM: Spinlock<InterruptSubsystem> = Spinlock::new(InterruptSubsystem::new());
+
+/// Interrupt subsystem state
+struct InterruptSubsystem {
+    descriptors: BTreeMap<u32, IrqDescriptor>,
+    enabled: bool,
+}
+
+impl InterruptSubsystem {
+    const fn new() -> Self {
+        Self {
+            descriptors: BTreeMap::new(),
+            enabled: false,
+        }
+    }
+    
+    fn add_descriptor(&mut self, desc: IrqDescriptor) {
+        let irq = desc.irq;
+        self.descriptors.insert(irq, desc);
+    }
+    
+    fn get_descriptor(&mut self, irq: u32) -> Option<&mut IrqDescriptor> {
+        self.descriptors.get_mut(&irq)
+    }
+}
+
+/// Initialize interrupt handling
+pub fn init() -> Result<()> {
+    let mut subsystem = INTERRUPT_SUBSYSTEM.lock();
+    
+    // Set up standard x86 interrupt vectors
+    init_standard_interrupts(&mut subsystem)?;
+    
+    // Initialize interrupt controller (PIC/APIC)
+    init_interrupt_controller()?;
+    
+    // Set up exception handlers
+    init_exception_handlers()?;
+    
+    subsystem.enabled = true;
+    crate::info!("Interrupt subsystem initialized");
+    
+    Ok(())
+}
+
+/// Initialize standard x86 interrupts
+fn init_standard_interrupts(subsystem: &mut InterruptSubsystem) -> Result<()> {
+    // Timer interrupt (IRQ 0)
+    let timer_desc = IrqDescriptor::new(0, "timer");
+    subsystem.add_descriptor(timer_desc);
+    
+    // Keyboard interrupt (IRQ 1)  
+    let keyboard_desc = IrqDescriptor::new(1, "keyboard");
+    subsystem.add_descriptor(keyboard_desc);
+    
+    // Cascade for slave PIC (IRQ 2)
+    let cascade_desc = IrqDescriptor::new(2, "cascade");
+    subsystem.add_descriptor(cascade_desc);
+    
+    // Serial port 2/4 (IRQ 3)
+    let serial_desc = IrqDescriptor::new(3, "serial");
+    subsystem.add_descriptor(serial_desc);
+    
+    // Serial port 1/3 (IRQ 4)
+    let serial2_desc = IrqDescriptor::new(4, "serial");
+    subsystem.add_descriptor(serial2_desc);
+    
+    // Parallel port (IRQ 7)
+    let parallel_desc = IrqDescriptor::new(7, "parallel");
+    subsystem.add_descriptor(parallel_desc);
+    
+    // Real-time clock (IRQ 8)
+    let rtc_desc = IrqDescriptor::new(8, "rtc");
+    subsystem.add_descriptor(rtc_desc);
+    
+    // Mouse (IRQ 12)
+    let mouse_desc = IrqDescriptor::new(12, "mouse");
+    subsystem.add_descriptor(mouse_desc);
+    
+    // IDE primary (IRQ 14)
+    let ide1_desc = IrqDescriptor::new(14, "ide");
+    subsystem.add_descriptor(ide1_desc);
+    
+    // IDE secondary (IRQ 15)
+    let ide2_desc = IrqDescriptor::new(15, "ide");
+    subsystem.add_descriptor(ide2_desc);
+    
+    Ok(())
+}
+
+/// Initialize interrupt controller
+fn init_interrupt_controller() -> Result<()> {
+    // TODO: Initialize PIC or APIC
+    // For now, just set up basic PIC configuration
+    unsafe {
+        // Remap PIC interrupts to avoid conflicts with CPU exceptions
+        crate::arch::x86_64::pic::init_pic();
+    }
+    Ok(())
+}
+
+/// Initialize exception handlers
+fn init_exception_handlers() -> Result<()> {
+    // TODO: Set up IDT with exception handlers
+    // For now, placeholder
+    Ok(())
+}
+
+/// Register an interrupt handler - Linux compatible
+pub fn request_irq(
+    irq: u32,
+    handler: IrqHandler,
+    flags: u32,
+    name: &'static str,
+    dev_id: *mut u8,
+) -> Result<()> {
+    let mut subsystem = INTERRUPT_SUBSYSTEM.lock();
+    
+    if let Some(desc) = subsystem.get_descriptor(irq) {
+        let action = IrqAction::new(handler, flags, name, dev_id);
+        
+        // Check if IRQ is shared
+        if flags & irq_flags::IRQF_SHARED != 0 {
+            // Add to action chain
+            let mut current = &mut desc.action;
+            while let Some(ref mut act) = current {
+                current = &mut act.next;
+            }
+            *current = Some(Box::new(action));
+        } else {
+            // Replace existing action
+            desc.action = Some(Box::new(action));
+        }
+        
+        // Enable the interrupt
+        desc.enable();
+        
+        crate::info!("Registered IRQ {} handler: {}", irq, name);
+        Ok(())
+    } else {
+        Err(Error::InvalidArgument)
+    }
+}
+
+/// Unregister an interrupt handler - Linux compatible
+pub fn free_irq(irq: u32, dev_id: *mut u8) -> Result<()> {
+    let mut subsystem = INTERRUPT_SUBSYSTEM.lock();
+    
+    if let Some(desc) = subsystem.get_descriptor(irq) {
+        // Remove action with matching dev_id
+        let mut current = &mut desc.action;
+        let mut found = false;
+        
+        while let Some(ref mut action) = current {
+            if action.dev_id == dev_id {
+                *current = action.next.take();
+                found = true;
+                break;
+            }
+            current = &mut action.next;
+        }
+        
+        if found {
+            // If no more actions, disable the interrupt
+            if desc.action.is_none() {
+                desc.disable();
+            }
+            
+            crate::info!("Freed IRQ {} handler", irq);
+            Ok(())
+        } else {
+            Err(Error::NotFound)
+        }
+    } else {
+        Err(Error::InvalidArgument)
+    }
+}
+
+/// Enable interrupts globally
+pub fn enable() {
+    #[cfg(target_arch = "x86_64")]
+    unsafe {
+        core::arch::asm!("sti");
+    }
+}
+
+/// Disable interrupts globally
+pub fn disable() {
+    #[cfg(target_arch = "x86_64")]
+    unsafe {
+        core::arch::asm!("cli");
+    }
+}
+
+/// Enable a specific interrupt line
+pub fn enable_irq(irq: u32) -> Result<()> {
+    let mut subsystem = INTERRUPT_SUBSYSTEM.lock();
+    
+    if let Some(desc) = subsystem.get_descriptor(irq) {
+        desc.enable();
+        crate::debug!("Enabled IRQ {}", irq);
+        Ok(())
+    } else {
+        Err(Error::InvalidArgument)
+    }
+}
+
+/// Disable a specific interrupt line
+pub fn disable_irq(irq: u32) -> Result<()> {
+    let mut subsystem = INTERRUPT_SUBSYSTEM.lock();
+    
+    if let Some(desc) = subsystem.get_descriptor(irq) {
+        desc.disable();
+        crate::debug!("Disabled IRQ {}", irq);
+        Ok(())
+    } else {
+        Err(Error::InvalidArgument)
+    }
+}
+
+/// Handle an interrupt - called from low-level interrupt handlers
+pub fn handle_interrupt(irq: u32) {
+    let mut subsystem = INTERRUPT_SUBSYSTEM.lock();
+    
+    if let Some(desc) = subsystem.get_descriptor(irq) {
+        desc.irq_count += 1;
+        
+        if !desc.is_enabled() {
+            // Interrupt is disabled, shouldn't happen
+            crate::warn!("Received disabled interrupt {}", irq);
+            return;
+        }
+        
+        // Call all handlers in the action chain
+        let mut current = desc.action.as_ref();
+        let mut handled = false;
+        
+        while let Some(action) = current {
+            let result = (action.handler)(irq, action.dev_id);
+            match result {
+                IrqReturn::Handled => {
+                    handled = true;
+                }
+                IrqReturn::WakeThread => {
+                    handled = true;
+                    // TODO: Wake threaded interrupt handler
+                }
+                IrqReturn::None => {
+                    // Handler didn't handle this interrupt
+                }
+            }
+            current = action.next.as_ref();
+        }
+        
+        if !handled {
+            desc.irqs_unhandled += 1;
+            if desc.irqs_unhandled > 100 {
+                crate::warn!("Too many unhandled interrupts on IRQ {}", irq);
+            }
+        }
+    } else {
+        crate::warn!("Spurious interrupt {}", irq);
+    }
+}
+
+/// Get interrupt statistics
+pub fn get_irq_stats() -> Vec<(u32, &'static str, u64, u64)> {
+    let subsystem = INTERRUPT_SUBSYSTEM.lock();
+    let mut stats = Vec::new();
+    
+    for (irq, desc) in &subsystem.descriptors {
+        stats.push((*irq, desc.name, desc.irq_count, desc.irqs_unhandled));
+    }
+    
+    stats
+}

kernel/src/lib.rs

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! The Rust kernel crate.
+//!
+//! This crate provides the core kernel APIs and functionality for the Rust kernel.
+//! It is inspired by the Linux kernel's Rust infrastructure but designed as a
+//! standalone kernel implementation.
+
+#![no_std]
+#![feature(alloc_error_handler)]
+#![feature(panic_info_message)]
+#![feature(asm_const)]
+#![feature(const_mut_refs)]
+#![feature(custom_test_frameworks)]
+#![test_runner(crate::test_runner)]
+#![reexport_test_harness_main = "test_main"]
+
+extern crate alloc;
+
+pub mod allocator;
+pub mod arch;
+pub mod boot;
+pub mod console;
+pub mod cpu;
+pub mod device;
+pub mod driver;
+pub mod error;
+pub mod fs;
+pub mod init;
+pub mod interrupt;
+pub mod memory;
+pub mod module;
+pub mod panic;
+pub mod prelude;
+pub mod process;
+pub mod scheduler;
+pub mod sync;
+pub mod syscall;
+pub mod task;
+pub mod time;
+pub mod types;
+
+use core::panic::PanicInfo;
+
+/// Kernel version information
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");
+pub const NAME: &str = "Rust Kernel";
+
+/// Kernel entry point called from architecture-specific code
+#[no_mangle]
+pub extern "C" fn kernel_main() -> ! {
+    init::early_init();
+    init::main_init();
+    
+    // Should not return from main_init
+    panic!("kernel_main returned unexpectedly");
+}
+
+/// Test runner for kernel tests
+#[cfg(test)]
+fn test_runner(tests: &[&dyn Fn()]) {
+    println!("Running {} tests", tests.len());
+    for test in tests {
+        test();
+    }
+    exit_qemu(QemuExitCode::Success);
+}
+
+#[cfg(test)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[repr(u32)]
+pub enum QemuExitCode {
+    Success = 0x10,
+    Failed = 0x11,
+}
+
+#[cfg(test)]
+pub fn exit_qemu(exit_code: QemuExitCode) {
+    use arch::x86_64::port::Port;
+    
+    unsafe {
+        let mut port = Port::new(0xf4);
+        port.write(exit_code as u32);
+    }
+}
+
+/// Kernel panic handler
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    panic::panic_handler(info)
+}
+
+/// Global allocator error handler
+#[alloc_error_handler]
+fn alloc_error_handler(layout: alloc::alloc::Layout) -> ! {
+    panic!("allocation error: {:?}", layout)
+}

kernel/src/memory/allocator.rs

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Heap allocator implementation
+
+use crate::memory::ALLOCATOR;
+use crate::types::{VirtAddr, PAGE_SIZE};
+use crate::error::Result;
+
+/// Heap start address (will be set during initialization)
+static mut HEAP_START: usize = 0;
+static mut HEAP_SIZE: usize = 0;
+
+/// Initialize the heap allocator
+pub fn init() -> Result<()> {
+    // TODO: Get heap region from memory map
+    // For now, use a fixed region
+    let heap_start = 0x_4444_4444_0000;
+    let heap_size = 100 * 1024; // 100 KB
+    
+    unsafe {
+        HEAP_START = heap_start;
+        HEAP_SIZE = heap_size;
+        ALLOCATOR.lock().init(heap_start, heap_size);
+    }
+    
+    Ok(())
+}
+
+/// Get heap statistics
+pub fn heap_stats() -> (usize, usize) {
+    unsafe { (HEAP_START, HEAP_SIZE) }
+}

kernel/src/memory/kmalloc.rs

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Kernel memory allocation (kmalloc)
+
+use crate::error::Result;
+
+/// Allocate kernel memory
+pub fn kmalloc(size: usize) -> Result<*mut u8> {
+    // TODO: implement proper kmalloc
+    Ok(core::ptr::null_mut())
+}
+
+/// Free kernel memory
+pub fn kfree(ptr: *mut u8) {
+    // TODO: implement proper kfree
+}

kernel/src/memory/mod.rs

@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Memory management subsystem
+
+pub mod allocator;
+pub mod page;
+pub mod vmalloc;
+pub mod kmalloc;
+
+use crate::types::{PhysAddr, VirtAddr, Pfn};
+use crate::error::{Error, Result};
+use core::alloc::{GlobalAlloc, Layout};
+use linked_list_allocator::LockedHeap;
+
+/// GFP (Get Free Pages) flags - compatible with Linux kernel
+pub mod gfp {
+    pub const GFP_KERNEL: u32 = 0;
+    pub const GFP_ATOMIC: u32 = 1;
+    pub const GFP_USER: u32 = 2;
+    pub const GFP_HIGHUSER: u32 = 3;
+    pub const GFP_DMA: u32 = 4;
+    pub const GFP_DMA32: u32 = 8;
+    pub const GFP_NOWAIT: u32 = 16;
+    pub const GFP_NOIO: u32 = 32;
+    pub const GFP_NOFS: u32 = 64;
+    pub const GFP_ZERO: u32 = 128;
+}
+
+/// Global heap allocator
+#[global_allocator]
+static ALLOCATOR: LockedHeap = LockedHeap::empty();
+
+/// Linux-compatible allocation flags
+#[derive(Clone, Copy, PartialEq)]
+pub struct AllocFlags(u32);
+
+impl AllocFlags {
+    pub const fn new(flags: u32) -> Self {
+        Self(flags)
+    }
+    
+    pub fn as_raw(self) -> u32 {
+        self.0
+    }
+    
+    pub fn contains(self, flags: AllocFlags) -> bool {
+        (self.0 & flags.0) == flags.0
+    }
+}
+
+/// GFP flags constants
+pub const GFP_KERNEL: AllocFlags = AllocFlags::new(gfp::GFP_KERNEL);
+pub const GFP_ATOMIC: AllocFlags = AllocFlags::new(gfp::GFP_ATOMIC);
+pub const GFP_USER: AllocFlags = AllocFlags::new(gfp::GFP_USER);
+
+/// Initialize the memory management subsystem with proper Linux-style initialization
+pub fn init() -> Result<()> {
+    allocator::init()?;
+    page::init()?;
+    
+    // Initialize zone allocator
+    init_zones()?;
+    
+    // Set up buddy allocator
+    init_buddy_allocator()?;
+    
+    // Initialize slab allocator
+    init_slab_allocator()?;
+    
+    crate::info!("Memory management initialized");
+    Ok(())
+}
+
+/// Initialize memory zones (DMA, Normal, High)
+fn init_zones() -> Result<()> {
+    // TODO: Set up memory zones based on architecture
+    Ok(())
+}
+
+/// Initialize buddy allocator for page allocation
+fn init_buddy_allocator() -> Result<()> {
+    // TODO: Set up buddy allocator
+    Ok(())
+}
+
+/// Initialize slab allocator for object caching
+fn init_slab_allocator() -> Result<()> {
+    // TODO: Set up SLAB/SLUB allocator
+    Ok(())
+}
+
+/// Physical memory information
+#[derive(Debug)]
+pub struct MemoryInfo {
+    pub total_pages: usize,
+    pub free_pages: usize,
+    pub used_pages: usize,
+    pub kernel_pages: usize,
+}
+
+/// Get current memory information
+pub fn memory_info() -> MemoryInfo {
+    MemoryInfo {
+        total_pages: 0,  // TODO: implement
+        free_pages: 0,
+        used_pages: 0,
+        kernel_pages: 0,
+    }
+}
+
+/// Allocate a page of physical memory
+pub fn alloc_page() -> Result<PhysAddr> {
+    page::alloc_page()
+}
+
+/// Free a page of physical memory
+pub fn free_page(addr: PhysAddr) {
+    page::free_page(addr)
+}
+
+/// Map a virtual address to a physical address
+pub fn map_page(virt: VirtAddr, phys: PhysAddr) -> Result<()> {
+    // TODO: implement page table mapping
+    Ok(())
+}
+
+/// Unmap a virtual address
+pub fn unmap_page(virt: VirtAddr) -> Result<()> {
+    // TODO: implement page table unmapping
+    Ok(())
+}
+
+/// Convert virtual address to physical address
+pub fn virt_to_phys(virt: VirtAddr) -> Result<PhysAddr> {
+    // TODO: implement address translation
+    Ok(PhysAddr::new(virt.as_usize()))
+}
+
+/// Convert physical address to virtual address
+pub fn phys_to_virt(phys: PhysAddr) -> Result<VirtAddr> {
+    // TODO: implement address translation
+    Ok(VirtAddr::new(phys.as_usize()))
+}
+
+/// Page table entry
+#[derive(Debug, Clone, Copy)]
+pub struct PageTableEntry(pub u64);
+
+impl PageTableEntry {
+    pub const fn new() -> Self {
+        Self(0)
+    }
+    
+    pub fn present(self) -> bool {
+        self.0 & 1 != 0
+    }
+    
+    pub fn writable(self) -> bool {
+        self.0 & 2 != 0
+    }
+    
+    pub fn user_accessible(self) -> bool {
+        self.0 & 4 != 0
+    }
+    
+    pub fn frame(self) -> Pfn {
+        Pfn((self.0 >> 12) as usize)
+    }
+    
+    pub fn set_present(&mut self, present: bool) {
+        if present {
+            self.0 |= 1;
+        } else {
+            self.0 &= !1;
+        }
+    }
+    
+    pub fn set_writable(&mut self, writable: bool) {
+        if writable {
+            self.0 |= 2;
+        } else {
+            self.0 &= !2;
+        }
+    }
+    
+    pub fn set_user_accessible(&mut self, user: bool) {
+        if user {
+            self.0 |= 4;
+        } else {
+            self.0 &= !4;
+        }
+    }
+    
+    pub fn set_frame(&mut self, frame: Pfn) {
+        self.0 = (self.0 & 0xfff) | ((frame.0 as u64) << 12);
+    }
+}
+
+/// Page table
+#[repr(align(4096))]
+pub struct PageTable {
+    entries: [PageTableEntry; 512],
+}
+
+impl PageTable {
+    pub const fn new() -> Self {
+        Self {
+            entries: [PageTableEntry::new(); 512],
+        }
+    }
+    
+    pub fn zero(&mut self) {
+        for entry in self.entries.iter_mut() {
+            *entry = PageTableEntry::new();
+        }
+    }
+}
+
+/// Memory mapping flags
+bitflags::bitflags! {
+    pub struct MapFlags: u32 {
+        const READ = 1 << 0;
+        const WRITE = 1 << 1;
+        const EXECUTE = 1 << 2;
+        const USER = 1 << 3;
+        const GLOBAL = 1 << 4;
+        const CACHED = 1 << 5;
+        const DEVICE = 1 << 6;
+    }
+}

kernel/src/memory/page.rs

@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Page frame allocator
+
+use crate::types::{PhysAddr, Pfn};
+use crate::error::{Error, Result};
+use crate::sync::Spinlock;
+use alloc::collections::BTreeSet;
+
+/// Page frame allocator
+static PAGE_ALLOCATOR: Spinlock<PageAllocator> = Spinlock::new(PageAllocator::new());
+
+/// Page allocator implementation
+struct PageAllocator {
+    free_pages: BTreeSet<Pfn>,
+    total_pages: usize,
+    allocated_pages: usize,
+}
+
+impl PageAllocator {
+    const fn new() -> Self {
+        Self {
+            free_pages: BTreeSet::new(),
+            total_pages: 0,
+            allocated_pages: 0,
+        }
+    }
+    
+    /// Add a range of pages to the free list
+    fn add_free_range(&mut self, start: Pfn, count: usize) {
+        for i in 0..count {
+            self.free_pages.insert(Pfn(start.0 + i));
+        }
+        self.total_pages += count;
+    }
+    
+    /// Allocate a single page
+    fn alloc_page(&mut self) -> Result<Pfn> {
+        if let Some(pfn) = self.free_pages.iter().next().copied() {
+            self.free_pages.remove(&pfn);
+            self.allocated_pages += 1;
+            Ok(pfn)
+        } else {
+            Err(Error::OutOfMemory)
+        }
+    }
+    
+    /// Free a single page
+    fn free_page(&mut self, pfn: Pfn) {
+        if self.free_pages.insert(pfn) {
+            self.allocated_pages -= 1;
+        }
+    }
+    
+    /// Get statistics
+    fn stats(&self) -> (usize, usize, usize) {
+        (self.total_pages, self.allocated_pages, self.free_pages.len())
+    }
+}
+
+/// Initialize the page allocator
+pub fn init() -> Result<()> {
+    let mut allocator = PAGE_ALLOCATOR.lock();
+    
+    // TODO: Get memory map from bootloader/firmware
+    // For now, add a dummy range
+    let start_pfn = Pfn(0x1000); // Start at 16MB
+    let count = 0x10000; // 256MB worth of pages
+    
+    allocator.add_free_range(start_pfn, count);
+    
+    Ok(())
+}
+
+/// Allocate a page of physical memory
+pub fn alloc_page() -> Result<PhysAddr> {
+    let mut allocator = PAGE_ALLOCATOR.lock();
+    let pfn = allocator.alloc_page()?;
+    Ok(pfn.to_phys_addr())
+}
+
+/// Free a page of physical memory
+pub fn free_page(addr: PhysAddr) {
+    let pfn = Pfn::from_phys_addr(addr);
+    let mut allocator = PAGE_ALLOCATOR.lock();
+    allocator.free_page(pfn);
+}
+
+/// Get page allocator statistics
+pub fn stats() -> (usize, usize, usize) {
+    let allocator = PAGE_ALLOCATOR.lock();
+    allocator.stats()
+}

kernel/src/memory/vmalloc.rs

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Virtual memory allocation
+
+use crate::error::Result;
+use crate::types::VirtAddr;
+
+/// Allocate virtual memory
+pub fn vmalloc(size: usize) -> Result<VirtAddr> {
+    // TODO: implement proper vmalloc  
+    Ok(VirtAddr::new(0))
+}
+
+/// Free virtual memory
+pub fn vfree(addr: VirtAddr) {
+    // TODO: implement proper vfree
+}

kernel/src/module.rs

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Kernel module support
+
+use crate::error::Result;
+
+/// Module metadata
+pub struct ThisModule {
+    pub name: &'static str,
+    pub author: &'static str,
+    pub description: &'static str,
+    pub license: &'static str,
+}
+
+/// Trait for kernel modules
+pub trait Module: Sized {
+    /// Initialize the module
+    fn init(module: &'static ThisModule) -> Result<Self>;
+    
+    /// Clean up the module
+    fn exit(module: &'static ThisModule) {
+        // Default implementation does nothing
+    }
+}

kernel/src/panic.rs

@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Kernel panic handler
+
+use core::panic::PanicInfo;
+use core::fmt::Write;
+
+/// Panic handler
+pub fn panic_handler(info: &PanicInfo) -> ! {
+    // Disable interrupts
+    #[cfg(target_arch = "x86_64")]
+    unsafe {
+        core::arch::asm!("cli");
+    }
+    
+    // Print panic information
+    let mut writer = PanicWriter;
+    writeln!(writer, "\n\n=== KERNEL PANIC ===").ok();
+    
+    if let Some(location) = info.location() {
+        writeln!(
+            writer,
+            "Panic at {}:{}:{}",
+            location.file(),
+            location.line(),
+            location.column()
+        ).ok();
+    }
+    
+    if let Some(message) = info.message() {
+        writeln!(writer, "Message: {}", message).ok();
+    }
+    
+    writeln!(writer, "===================\n").ok();
+    
+    // TODO: Print stack trace
+    // TODO: Save panic information to log
+    
+    // Halt the system
+    loop {
+        #[cfg(target_arch = "x86_64")]
+        unsafe {
+            core::arch::asm!("hlt");
+        }
+        
+        #[cfg(not(target_arch = "x86_64"))]
+        core::hint::spin_loop();
+    }
+}
+
+/// Writer for panic messages
+struct PanicWriter;
+
+impl Write for PanicWriter {
+    fn write_str(&mut self, s: &str) -> core::fmt::Result {
+        // Write directly to VGA buffer or serial port
+        for byte in s.bytes() {
+            #[cfg(target_arch = "x86_64")]
+            unsafe {
+                // Write to serial port (COM1)
+                core::arch::asm!(
+                    "out dx, al",
+                    in("dx") 0x3f8u16,
+                    in("al") byte,
+                );
+            }
+        }
+        Ok(())
+    }
+}

kernel/src/prelude.rs

@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Kernel prelude - commonly used types and traits
+
+pub use crate::error::{Error, Result};
+pub use crate::types::*;
+pub use crate::sync::{Mutex, RwLock, Spinlock};
+pub use crate::memory::{PhysAddr, VirtAddr, Page, PageTable};
+pub use crate::device::Device;
+pub use crate::driver::{Driver, DriverOps};
+pub use crate::process::{Process, Thread};
+pub use crate::task::Task;
+
+// Re-export common alloc types
+pub use alloc::{
+    boxed::Box,
+    string::{String, ToString},
+    vec::Vec,
+    collections::{BTreeMap, BTreeSet},
+    format,
+    vec,
+};
+
+// Re-export core types
+pub use core::{
+    mem,
+    ptr,
+    slice,
+    str,
+    fmt,
+    result::Result as CoreResult,
+    option::Option::{self, None, Some},
+};
+
+/// Print macros for kernel logging
+#[macro_export]
+macro_rules! print {
+    ($($arg:tt)*) => ($crate::console::_print(format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! println {
+    () => ($crate::print!("\n"));
+    ($($arg:tt)*) => ($crate::print!("{}\n", format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! kprint {
+    ($($arg:tt)*) => ($crate::console::_kprint(format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! kprintln {
+    () => ($crate::kprint!("\n"));
+    ($($arg:tt)*) => ($crate::kprint!("[KERNEL] {}\n", format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! debug {
+    ($($arg:tt)*) => {
+        #[cfg(feature = "debug")]
+        $crate::kprintln!("[DEBUG] {}", format_args!($($arg)*))
+    };
+}
+
+#[macro_export]
+macro_rules! info {
+    ($($arg:tt)*) => ($crate::kprintln!("[INFO] {}", format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! warn {
+    ($($arg:tt)*) => ($crate::kprintln!("[WARN] {}", format_args!($($arg)*)));
+}
+
+#[macro_export]
+macro_rules! error {
+    ($($arg:tt)*) => ($crate::kprintln!("[ERROR] {}", format_args!($($arg)*)));
+}
+
+/// Module definition macro
+#[macro_export]
+macro_rules! module {
+    (
+        type: $type:ty,
+        name: $name:expr,
+        author: $author:expr,
+        description: $description:expr,
+        license: $license:expr $(,)?
+    ) => {
+        static __THIS_MODULE: $crate::module::ThisModule = $crate::module::ThisModule {
+            name: $name,
+            author: $author,
+            description: $description,
+            license: $license,
+        };
+
+        #[no_mangle]
+        pub extern "C" fn init_module() -> core::ffi::c_int {
+            match <$type as $crate::module::Module>::init(&__THIS_MODULE) {
+                Ok(_) => 0,
+                Err(e) => e.to_errno(),
+            }
+        }
+
+        #[no_mangle]
+        pub extern "C" fn cleanup_module() {
+            <$type as $crate::module::Module>::exit(&__THIS_MODULE)
+        }
+    };
+}

kernel/src/process.rs

@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Process and thread management
+
+use crate::types::{Pid, Tid, Uid, Gid};
+use crate::error::{Error, Result};
+use crate::sync::Spinlock;
+use crate::memory::VirtAddr;
+use alloc::{string::String, vec::Vec, collections::BTreeMap};
+use core::sync::atomic::{AtomicU32, Ordering};
+
+/// Process state - compatible with Linux kernel
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ProcessState {
+    Running,
+    Sleeping,
+    Stopped,
+    Zombie,
+    Dead,
+}
+
+/// Process structure - similar to Linux task_struct
+#[derive(Debug)]
+pub struct Process {
+    pub pid: Pid,
+    pub parent: Option<Pid>,
+    pub state: ProcessState,
+    pub uid: Uid,
+    pub gid: Gid,
+    pub name: String,
+    pub threads: Vec<Thread>,
+    pub memory_map: Option<VirtAddr>, // Points to mm_struct equivalent
+    pub files: Vec<u32>, // File descriptor table
+    pub signal_pending: bool,
+    pub exit_code: i32,
+}
+
+impl Process {
+    pub fn new(pid: Pid, name: String, uid: Uid, gid: Gid) -> Self {
+        Self {
+            pid,
+            parent: None,
+            state: ProcessState::Running,
+            uid,
+            gid,
+            name,
+            threads: Vec::new(),
+            memory_map: None,
+            files: Vec::new(),
+            signal_pending: false,
+            exit_code: 0,
+        }
+    }
+    
+    /// Add a thread to this process
+    pub fn add_thread(&mut self, thread: Thread) {
+        self.threads.push(thread);
+    }
+    
+    /// Get the main thread
+    pub fn main_thread(&self) -> Option<&Thread> {
+        self.threads.first()
+    }
+    
+    /// Set process state
+    pub fn set_state(&mut self, state: ProcessState) {
+        self.state = state;
+    }
+    
+    /// Check if process is running
+    pub fn is_running(&self) -> bool {
+        self.state == ProcessState::Running
+    }
+}
+
+/// Thread structure - Linux-compatible
+#[derive(Debug, Clone)]
+pub struct Thread {
+    pub tid: Tid,
+    pub process_pid: Pid,
+    pub state: ProcessState,
+    pub stack_pointer: VirtAddr,
+    pub instruction_pointer: VirtAddr,
+    pub priority: i32,
+    pub nice: i32, // Nice value (-20 to 19)
+    pub cpu_time: u64, // Nanoseconds
+    pub context: ThreadContext,
+}
+
+impl Thread {
+    pub fn new(tid: Tid, process_pid: Pid, priority: i32) -> Self {
+        Self {
+            tid,
+            process_pid,
+            state: ProcessState::Running,
+            stack_pointer: VirtAddr::new(0),
+            instruction_pointer: VirtAddr::new(0),
+            priority,
+            nice: 0,
+            cpu_time: 0,
+            context: ThreadContext::new(),
+        }
+    }
+    
+    /// Set thread state
+    pub fn set_state(&mut self, state: ProcessState) {
+        self.state = state;
+    }
+    
+    /// Update CPU time
+    pub fn add_cpu_time(&mut self, time: u64) {
+        self.cpu_time += time;
+    }
+}
+
+/// Thread context for context switching
+#[derive(Debug, Clone, Default)]
+pub struct ThreadContext {
+    // x86_64 registers
+    pub rax: u64,
+    pub rbx: u64,
+    pub rcx: u64,
+    pub rdx: u64,
+    pub rsi: u64,
+    pub rdi: u64,
+    pub rbp: u64,
+    pub rsp: u64,
+    pub r8: u64,
+    pub r9: u64,
+    pub r10: u64,
+    pub r11: u64,
+    pub r12: u64,
+    pub r13: u64,
+    pub r14: u64,
+    pub r15: u64,
+    pub rip: u64,
+    pub rflags: u64,
+    // Segment registers
+    pub cs: u16,
+    pub ds: u16,
+    pub es: u16,
+    pub fs: u16,
+    pub gs: u16,
+    pub ss: u16,
+}
+
+impl ThreadContext {
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
+/// Global process table
+static PROCESS_TABLE: Spinlock<ProcessTable> = Spinlock::new(ProcessTable::new());
+static NEXT_PID: AtomicU32 = AtomicU32::new(1);
+static NEXT_TID: AtomicU32 = AtomicU32::new(1);
+
+/// Process table implementation
+struct ProcessTable {
+    processes: BTreeMap<Pid, Process>,
+    current_process: Option<Pid>,
+}
+
+impl ProcessTable {
+    const fn new() -> Self {
+        Self {
+            processes: BTreeMap::new(),
+            current_process: None,
+        }
+    }
+    
+    fn add_process(&mut self, process: Process) {
+        let pid = process.pid;
+        self.processes.insert(pid, process);
+        if self.current_process.is_none() {
+            self.current_process = Some(pid);
+        }
+    }
+    
+    fn get_process(&self, pid: Pid) -> Option<&Process> {
+        self.processes.get(&pid)
+    }
+    
+    fn get_process_mut(&mut self, pid: Pid) -> Option<&mut Process> {
+        self.processes.get_mut(&pid)
+    }
+    
+    fn remove_process(&mut self, pid: Pid) -> Option<Process> {
+        let process = self.processes.remove(&pid);
+        if self.current_process == Some(pid) {
+            self.current_process = self.processes.keys().next().copied();
+        }
+        process
+    }
+    
+    fn list_processes(&self) -> Vec<Pid> {
+        self.processes.keys().copied().collect()
+    }
+}
+
+/// Allocate a new PID
+pub fn allocate_pid() -> Pid {
+    Pid(NEXT_PID.fetch_add(1, Ordering::SeqCst))
+}
+
+/// Allocate a new TID
+pub fn allocate_tid() -> Tid {
+    Tid(NEXT_TID.fetch_add(1, Ordering::SeqCst))
+}
+
+/// Create a new process
+pub fn create_process(name: String, uid: Uid, gid: Gid) -> Result<Pid> {
+    let pid = allocate_pid();
+    let mut process = Process::new(pid, name, uid, gid);
+    
+    // Create main thread
+    let tid = allocate_tid();
+    let main_thread = Thread::new(tid, pid, 0);
+    process.add_thread(main_thread);
+    
+    let mut table = PROCESS_TABLE.lock();
+    table.add_process(process);
+    
+    Ok(pid)
+}
+
+/// Get current process
+pub fn current_process() -> Option<Pid> {
+    let table = PROCESS_TABLE.lock();
+    table.current_process
+}
+
+/// Get process by PID
+pub fn get_process(pid: Pid) -> Option<Process> {
+    let table = PROCESS_TABLE.lock();
+    table.get_process(pid).cloned()
+}
+
+/// Kill a process
+pub fn kill_process(pid: Pid, signal: i32) -> Result<()> {
+    let mut table = PROCESS_TABLE.lock();
+    if let Some(process) = table.get_process_mut(pid) {
+        process.set_state(ProcessState::Dead);
+        process.exit_code = signal;
+        Ok(())
+    } else {
+        Err(Error::NotFound)
+    }
+}
+
+/// List all processes
+pub fn list_processes() -> Vec<Pid> {
+    let table = PROCESS_TABLE.lock();
+    table.list_processes()
+}
+
+/// Initialize the process subsystem
+pub fn init() -> Result<()> {
+    // Create kernel process (PID 0)
+    let _kernel_pid = create_process(
+        String::from("kernel"),
+        Uid(0),
+        Gid(0)
+    )?;
+    
+    // Create init process (PID 1) 
+    let _init_pid = create_process(
+        String::from("init"),
+        Uid(0), 
+        Gid(0)
+    )?;
+    
+    Ok(())
+}

kernel/src/scheduler.rs

@@ -0,0 +1,569 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Task scheduler compatible with Linux kernel CFS (Completely Fair Scheduler)
+
+use crate::error::{Error, Result};
+use crate::process::{Process, Thread, ProcessState, ThreadContext};
+use crate::types::{Pid, Tid, Nanoseconds};
+use crate::sync::Spinlock;
+use crate::time;
+use alloc::{collections::{BTreeMap, VecDeque}, vec::Vec};
+use core::sync::atomic::{AtomicU64, Ordering};
+
+/// Scheduler policies - Linux compatible
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum SchedulerPolicy {
+    Normal = 0,     // SCHED_NORMAL
+    Fifo = 1,       // SCHED_FIFO  
+    RoundRobin = 2, // SCHED_RR
+    Batch = 3,      // SCHED_BATCH
+    Idle = 5,       // SCHED_IDLE
+    Deadline = 6,   // SCHED_DEADLINE
+}
+
+/// Scheduler priority levels
+pub const MAX_PRIO: i32 = 140;
+pub const MAX_USER_RT_PRIO: i32 = 100;
+pub const MAX_RT_PRIO: i32 = MAX_USER_RT_PRIO;
+pub const DEFAULT_PRIO: i32 = MAX_RT_PRIO + 20;
+pub const MIN_NICE: i32 = -20;
+pub const MAX_NICE: i32 = 19;
+
+/// Convert nice value to priority
+pub fn nice_to_prio(nice: i32) -> i32 {
+    DEFAULT_PRIO + nice
+}
+
+/// Convert priority to nice value
+pub fn prio_to_nice(prio: i32) -> i32 {
+    prio - DEFAULT_PRIO
+}
+
+/// Scheduler entity - represents a schedulable unit
+#[derive(Debug, Clone)]
+pub struct SchedEntity {
+    pub tid: Tid,
+    pub policy: SchedulerPolicy,
+    pub priority: i32,
+    pub nice: i32,
+    pub vruntime: u64,      // Virtual runtime for CFS
+    pub exec_start: u64,    // Last execution start time
+    pub sum_exec_runtime: u64, // Total execution time
+    pub prev_sum_exec_runtime: u64,
+    pub load_weight: u32,   // Load weight for this entity
+    pub runnable_weight: u32,
+    pub on_rq: bool,        // On run queue?
+}
+
+impl SchedEntity {
+    pub fn new(tid: Tid, policy: SchedulerPolicy, nice: i32) -> Self {
+        let priority = nice_to_prio(nice);
+        Self {
+            tid,
+            policy,
+            priority,
+            nice,
+            vruntime: 0,
+            exec_start: 0,
+            sum_exec_runtime: 0,
+            prev_sum_exec_runtime: 0,
+            load_weight: nice_to_weight(nice),
+            runnable_weight: nice_to_weight(nice),
+            on_rq: false,
+        }
+    }
+    
+    /// Update virtual runtime
+    pub fn update_vruntime(&mut self, delta: u64) {
+        // Virtual runtime is weighted by load
+        let weighted_delta = delta * 1024 / self.load_weight as u64;
+        self.vruntime += weighted_delta;
+    }
+}
+
+/// Convert nice value to load weight (Linux compatible)
+fn nice_to_weight(nice: i32) -> u32 {
+    // Linux nice-to-weight table (simplified)
+    match nice {
+        -20 => 88761,
+        -19 => 71755,
+        -18 => 56483,
+        -17 => 46273,
+        -16 => 36291,
+        -15 => 29154,
+        -14 => 23254,
+        -13 => 18705,
+        -12 => 14949,
+        -11 => 11916,
+        -10 => 9548,
+        -9 => 7620,
+        -8 => 6100,
+        -7 => 4904,
+        -6 => 3906,
+        -5 => 3121,
+        -4 => 2501,
+        -3 => 1991,
+        -2 => 1586,
+        -1 => 1277,
+        0 => 1024,  // Default weight
+        1 => 820,
+        2 => 655,
+        3 => 526,
+        4 => 423,
+        5 => 335,
+        6 => 272,
+        7 => 215,
+        8 => 172,
+        9 => 137,
+        10 => 110,
+        11 => 87,
+        12 => 70,
+        13 => 56,
+        14 => 45,
+        15 => 36,
+        16 => 29,
+        17 => 23,
+        18 => 18,
+        19 => 15,
+        _ => 1024, // Default for out-of-range values
+    }
+}
+
+/// CFS (Completely Fair Scheduler) run queue
+#[derive(Debug)]
+pub struct CfsRunQueue {
+    tasks_timeline: BTreeMap<u64, SchedEntity>, // Red-black tree equivalent
+    min_vruntime: u64,
+    nr_running: u32,
+    load_weight: u64,
+    runnable_weight: u64,
+}
+
+impl CfsRunQueue {
+    pub fn new() -> Self {
+        Self {
+            tasks_timeline: BTreeMap::new(),
+            min_vruntime: 0,
+            nr_running: 0,
+            load_weight: 0,
+            runnable_weight: 0,
+        }
+    }
+    
+    /// Add task to run queue
+    pub fn enqueue_task(&mut self, mut se: SchedEntity) {
+        // Place entity in timeline
+        if !se.on_rq {
+            se.on_rq = true;
+            
+            // Ensure vruntime is not too far behind
+            if se.vruntime < self.min_vruntime {
+                se.vruntime = self.min_vruntime;
+            }
+            
+            self.tasks_timeline.insert(se.vruntime, se.clone());
+            self.nr_running += 1;
+            self.load_weight += se.load_weight as u64;
+            self.runnable_weight += se.runnable_weight as u64;
+        }
+    }
+    
+    /// Remove task from run queue
+    pub fn dequeue_task(&mut self, se: &SchedEntity) -> bool {
+        if se.on_rq {
+            self.tasks_timeline.remove(&se.vruntime);
+            self.nr_running -= 1;
+            self.load_weight -= se.load_weight as u64;
+            self.runnable_weight -= se.runnable_weight as u64;
+            true
+        } else {
+            false
+        }
+    }
+    
+    /// Pick next task to run
+    pub fn pick_next_task(&mut self) -> Option<SchedEntity> {
+        // Pick leftmost task (smallest vruntime)
+        if let Some((vruntime, se)) = self.tasks_timeline.iter().next() {
+            let se = se.clone();
+            let vruntime = *vruntime;
+            self.tasks_timeline.remove(&vruntime);
+            self.nr_running -= 1;
+            self.load_weight -= se.load_weight as u64;
+            self.runnable_weight -= se.runnable_weight as u64;
+            
+            // Update min_vruntime
+            if let Some((next_vruntime, _)) = self.tasks_timeline.iter().next() {
+                self.min_vruntime = core::cmp::max(self.min_vruntime, *next_vruntime);
+            } else {
+                self.min_vruntime = se.vruntime;
+            }
+            
+            Some(se)
+        } else {
+            None
+        }
+    }
+    
+    /// Check if run queue is empty
+    pub fn is_empty(&self) -> bool {
+        self.nr_running == 0
+    }
+}
+
+/// Real-time run queue (for FIFO/RR scheduling)
+#[derive(Debug)]
+pub struct RtRunQueue {
+    active: [VecDeque<SchedEntity>; MAX_RT_PRIO as usize],
+    rt_nr_running: u32,
+    highest_prio: i32,
+}
+
+impl RtRunQueue {
+    pub fn new() -> Self {
+        const EMPTY_QUEUE: VecDeque<SchedEntity> = VecDeque::new();
+        Self {
+            active: [EMPTY_QUEUE; MAX_RT_PRIO as usize],
+            rt_nr_running: 0,
+            highest_prio: MAX_RT_PRIO,
+        }
+    }
+    
+    pub fn enqueue_task(&mut self, se: SchedEntity) {
+        let prio = se.priority as usize;
+        if prio < MAX_RT_PRIO as usize {
+            self.active[prio].push_back(se);
+            self.rt_nr_running += 1;
+            if (prio as i32) < self.highest_prio {
+                self.highest_prio = prio as i32;
+            }
+        }
+    }
+    
+    pub fn dequeue_task(&mut self, se: &SchedEntity) -> bool {
+        let prio = se.priority as usize;
+        if prio < MAX_RT_PRIO as usize {
+            if let Some(pos) = self.active[prio].iter().position(|x| x.tid == se.tid) {
+                self.active[prio].remove(pos);
+                self.rt_nr_running -= 1;
+                
+                // Update highest_prio if this queue is now empty
+                if self.active[prio].is_empty() && prio as i32 == self.highest_prio {
+                    self.update_highest_prio();
+                }
+                return true;
+            }
+        }
+        false
+    }
+    
+    pub fn pick_next_task(&mut self) -> Option<SchedEntity> {
+        if self.rt_nr_running > 0 {
+            for prio in self.highest_prio as usize..MAX_RT_PRIO as usize {
+                if let Some(se) = self.active[prio].pop_front() {
+                    self.rt_nr_running -= 1;
+                    
+                    // For round-robin, re-enqueue at the end
+                    if se.policy == SchedulerPolicy::RoundRobin {
+                        self.active[prio].push_back(se.clone());
+                        self.rt_nr_running += 1;
+                    }
+                    
+                    if self.active[prio].is_empty() && prio as i32 == self.highest_prio {
+                        self.update_highest_prio();
+                    }
+                    
+                    return Some(se);
+                }
+            }
+        }
+        None
+    }
+    
+    fn update_highest_prio(&mut self) {
+        self.highest_prio = MAX_RT_PRIO;
+        for prio in 0..MAX_RT_PRIO as usize {
+            if !self.active[prio].is_empty() {
+                self.highest_prio = prio as i32;
+                break;
+            }
+        }
+    }
+    
+    pub fn is_empty(&self) -> bool {
+        self.rt_nr_running == 0
+    }
+}
+
+/// Per-CPU run queue
+#[derive(Debug)]
+pub struct RunQueue {
+    pub cpu: u32,
+    pub nr_running: u32,
+    pub current: Option<SchedEntity>,
+    pub cfs: CfsRunQueue,
+    pub rt: RtRunQueue,
+    pub idle_task: Option<SchedEntity>,
+    pub clock: u64,
+    pub clock_task: u64,
+}
+
+impl RunQueue {
+    pub fn new(cpu: u32) -> Self {
+        Self {
+            cpu,
+            nr_running: 0,
+            current: None,
+            cfs: CfsRunQueue::new(),
+            rt: RtRunQueue::new(),
+            idle_task: None,
+            clock: 0,
+            clock_task: 0,
+        }
+    }
+    
+    /// Update run queue clock
+    pub fn update_rq_clock(&mut self) {
+        self.clock = time::get_time_ns();
+        self.clock_task = self.clock;
+    }
+    
+    /// Enqueue a task
+    pub fn enqueue_task(&mut self, se: SchedEntity) {
+        match se.policy {
+            SchedulerPolicy::Normal | SchedulerPolicy::Batch | SchedulerPolicy::Idle => {
+                self.cfs.enqueue_task(se);
+            }
+            SchedulerPolicy::Fifo | SchedulerPolicy::RoundRobin => {
+                self.rt.enqueue_task(se);
+            }
+            SchedulerPolicy::Deadline => {
+                // TODO: implement deadline scheduler
+                self.cfs.enqueue_task(se);
+            }
+        }
+        self.nr_running += 1;
+    }
+    
+    /// Dequeue a task
+    pub fn dequeue_task(&mut self, se: &SchedEntity) -> bool {
+        let result = match se.policy {
+            SchedulerPolicy::Normal | SchedulerPolicy::Batch | SchedulerPolicy::Idle => {
+                self.cfs.dequeue_task(se)
+            }
+            SchedulerPolicy::Fifo | SchedulerPolicy::RoundRobin => {
+                self.rt.dequeue_task(se)
+            }
+            SchedulerPolicy::Deadline => {
+                self.cfs.dequeue_task(se)
+            }
+        };
+        
+        if result {
+            self.nr_running -= 1;
+        }
+        result
+    }
+    
+    /// Pick next task to run
+    pub fn pick_next_task(&mut self) -> Option<SchedEntity> {
+        // Real-time tasks have priority
+        if let Some(se) = self.rt.pick_next_task() {
+            return Some(se);
+        }
+        
+        // Then CFS tasks
+        if let Some(se) = self.cfs.pick_next_task() {
+            return Some(se);
+        }
+        
+        // Finally, idle task
+        self.idle_task.clone()
+    }
+}
+
+/// Global scheduler state
+static SCHEDULER: Spinlock<Scheduler> = Spinlock::new(Scheduler::new());
+static SCHEDULE_CLOCK: AtomicU64 = AtomicU64::new(0);
+
+/// Main scheduler structure
+struct Scheduler {
+    run_queues: Vec<RunQueue>,
+    nr_cpus: u32,
+    entities: BTreeMap<Tid, SchedEntity>,
+    need_resched: bool,
+}
+
+impl Scheduler {
+    const fn new() -> Self {
+        Self {
+            run_queues: Vec::new(),
+            nr_cpus: 1, // Single CPU for now
+            entities: BTreeMap::new(),
+            need_resched: false,
+        }
+    }
+    
+    fn init(&mut self) -> Result<()> {
+        // Create run queues for each CPU
+        for cpu in 0..self.nr_cpus {
+            let mut rq = RunQueue::new(cpu);
+            
+            // Create idle task for this CPU
+            let idle_se = SchedEntity::new(
+                crate::process::allocate_tid(),
+                SchedulerPolicy::Idle,
+                MAX_NICE
+            );
+            rq.idle_task = Some(idle_se);
+            
+            self.run_queues.push(rq);
+        }
+        Ok(())
+    }
+    
+    fn add_task(&mut self, tid: Tid, policy: SchedulerPolicy, nice: i32) {
+        let se = SchedEntity::new(tid, policy, nice);
+        self.entities.insert(tid, se.clone());
+        
+        // Add to CPU 0's run queue for simplicity
+        if let Some(rq) = self.run_queues.get_mut(0) {
+            rq.enqueue_task(se);
+        }
+    }
+    
+    fn remove_task(&mut self, tid: Tid) {
+        if let Some(se) = self.entities.remove(&tid) {
+            // Remove from all run queues
+            for rq in &mut self.run_queues {
+                rq.dequeue_task(&se);
+            }
+        }
+    }
+    
+    fn schedule(&mut self) -> Option<Tid> {
+        // Simple single-CPU scheduling for now
+        if let Some(rq) = self.run_queues.get_mut(0) {
+            rq.update_rq_clock();
+            
+            if let Some(se) = rq.pick_next_task() {
+                rq.current = Some(se.clone());
+                return Some(se.tid);
+            }
+        }
+        None
+    }
+    
+    fn set_need_resched(&mut self) {
+        self.need_resched = true;
+    }
+    
+    fn clear_need_resched(&mut self) {
+        self.need_resched = false;
+    }
+}
+
+/// Initialize the scheduler
+pub fn init() -> Result<()> {
+    let mut scheduler = SCHEDULER.lock();
+    scheduler.init()?;
+    
+    crate::info!("Scheduler initialized with {} CPUs", scheduler.nr_cpus);
+    Ok(())
+}
+
+/// Add a task to the scheduler
+pub fn add_task(tid: Tid, policy: SchedulerPolicy, nice: i32) {
+    let mut scheduler = SCHEDULER.lock();
+    scheduler.add_task(tid, policy, nice);
+}
+
+/// Remove a task from the scheduler
+pub fn remove_task(tid: Tid) {
+    let mut scheduler = SCHEDULER.lock();
+    scheduler.remove_task(tid);
+}
+
+/// Schedule the next task
+pub fn schedule() -> Option<Tid> {
+    let mut scheduler = SCHEDULER.lock();
+    let result = scheduler.schedule();
+    scheduler.clear_need_resched();
+    result
+}
+
+/// Yield the current thread
+pub fn yield_now() {
+    let mut scheduler = SCHEDULER.lock();
+    scheduler.set_need_resched();
+    // In a real implementation, this would trigger a context switch
+}
+
+/// Sleep for a given number of milliseconds
+pub fn sleep_ms(ms: u64) {
+    // TODO: implement proper sleep mechanism with timer integration
+    // For now, just yield
+    yield_now();
+}
+
+/// Set scheduler policy for a task
+pub fn set_scheduler_policy(tid: Tid, policy: SchedulerPolicy, nice: i32) -> Result<()> {
+    let mut scheduler = SCHEDULER.lock();
+    
+    if let Some(se) = scheduler.entities.get_mut(&tid) {
+        se.policy = policy;
+        se.nice = nice;
+        se.priority = nice_to_prio(nice);
+        se.load_weight = nice_to_weight(nice);
+        se.runnable_weight = nice_to_weight(nice);
+        Ok(())
+    } else {
+        Err(Error::NotFound)
+    }
+}
+
+/// Get scheduler statistics
+pub fn get_scheduler_stats() -> (u32, u32, bool) {
+    let scheduler = SCHEDULER.lock();
+    let total_tasks = scheduler.entities.len() as u32;
+    let running_tasks = scheduler.run_queues.iter().map(|rq| rq.nr_running).sum();
+    (total_tasks, running_tasks, scheduler.need_resched)
+}
+
+/// Timer tick - called from timer interrupt
+pub fn scheduler_tick() {
+    SCHEDULE_CLOCK.fetch_add(1, Ordering::Relaxed);
+    
+    let mut scheduler = SCHEDULER.lock();
+    
+    // Update current task's runtime
+    if let Some(rq) = scheduler.run_queues.get_mut(0) {
+        if let Some(ref mut current) = rq.current {
+            let now = rq.clock;
+            let delta = now - current.exec_start;
+            current.sum_exec_runtime += delta;
+            current.update_vruntime(delta);
+            current.exec_start = now;
+            
+            // Check if we need to reschedule
+            // For CFS, check if current task has run long enough
+            if current.policy == SchedulerPolicy::Normal {
+                let time_slice = calculate_time_slice(current);
+                if current.sum_exec_runtime - current.prev_sum_exec_runtime >= time_slice {
+                    scheduler.set_need_resched();
+                }
+            }
+        }
+    }
+}
+
+/// Calculate time slice for a task based on its weight
+fn calculate_time_slice(se: &SchedEntity) -> u64 {
+    // Linux-like time slice calculation
+    let sched_latency = 6_000_000; // 6ms in nanoseconds
+    let min_granularity = 750_000; // 0.75ms in nanoseconds
+    
+    // Time slice proportional to weight
+    let time_slice = sched_latency * se.load_weight as u64 / 1024;
+    core::cmp::max(time_slice, min_granularity)
+}

kernel/src/sync.rs

@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Synchronization primitives
+
+use core::cell::UnsafeCell;
+use core::ops::{Deref, DerefMut};
+use core::sync::atomic::{AtomicBool, Ordering};
+
+/// Spinlock implementation
+pub struct Spinlock<T> {
+    locked: AtomicBool,
+    data: UnsafeCell<T>,
+}
+
+unsafe impl<T: Send> Sync for Spinlock<T> {}
+unsafe impl<T: Send> Send for Spinlock<T> {}
+
+impl<T> Spinlock<T> {
+    pub const fn new(data: T) -> Self {
+        Self {
+            locked: AtomicBool::new(false),
+            data: UnsafeCell::new(data),
+        }
+    }
+    
+    pub fn lock(&self) -> SpinlockGuard<T> {
+        while self.locked.compare_exchange_weak(false, true, Ordering::Acquire, Ordering::Relaxed).is_err() {
+            // Busy wait
+            while self.locked.load(Ordering::Relaxed) {
+                core::hint::spin_loop();
+            }
+        }
+        
+        SpinlockGuard { lock: self }
+    }
+    
+    pub fn try_lock(&self) -> Option<SpinlockGuard<T>> {
+        if self.locked.compare_exchange(false, true, Ordering::Acquire, Ordering::Relaxed).is_ok() {
+            Some(SpinlockGuard { lock: self })
+        } else {
+            None
+        }
+    }
+}
+
+pub struct SpinlockGuard<'a, T> {
+    lock: &'a Spinlock<T>,
+}
+
+impl<T> Deref for SpinlockGuard<'_, T> {
+    type Target = T;
+    
+    fn deref(&self) -> &Self::Target {
+        unsafe { &*self.lock.data.get() }
+    }
+}
+
+impl<T> DerefMut for SpinlockGuard<'_, T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        unsafe { &mut *self.lock.data.get() }
+    }
+}
+
+impl<T> Drop for SpinlockGuard<'_, T> {
+    fn drop(&mut self) {
+        self.lock.locked.store(false, Ordering::Release);
+    }
+}
+
+/// Mutex implementation (placeholder - would need proper scheduler integration)
+pub struct Mutex<T> {
+    inner: Spinlock<T>,
+}
+
+impl<T> Mutex<T> {
+    pub const fn new(data: T) -> Self {
+        Self {
+            inner: Spinlock::new(data),
+        }
+    }
+    
+    pub fn lock(&self) -> MutexGuard<T> {
+        MutexGuard {
+            guard: self.inner.lock(),
+        }
+    }
+}
+
+pub struct MutexGuard<'a, T> {
+    guard: SpinlockGuard<'a, T>,
+}
+
+impl<T> Deref for MutexGuard<'_, T> {
+    type Target = T;
+    
+    fn deref(&self) -> &Self::Target {
+        &*self.guard
+    }
+}
+
+impl<T> DerefMut for MutexGuard<'_, T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut *self.guard
+    }
+}
+
+/// RwLock implementation (placeholder)
+pub struct RwLock<T> {
+    inner: Spinlock<T>,
+}
+
+impl<T> RwLock<T> {
+    pub const fn new(data: T) -> Self {
+        Self {
+            inner: Spinlock::new(data),
+        }
+    }
+    
+    pub fn read(&self) -> RwLockReadGuard<T> {
+        RwLockReadGuard {
+            guard: self.inner.lock(),
+        }
+    }
+    
+    pub fn write(&self) -> RwLockWriteGuard<T> {
+        RwLockWriteGuard {
+            guard: self.inner.lock(),
+        }
+    }
+}
+
+pub struct RwLockReadGuard<'a, T> {
+    guard: SpinlockGuard<'a, T>,
+}
+
+impl<T> Deref for RwLockReadGuard<'_, T> {
+    type Target = T;
+    
+    fn deref(&self) -> &Self::Target {
+        &*self.guard
+    }
+}
+
+pub struct RwLockWriteGuard<'a, T> {
+    guard: SpinlockGuard<'a, T>,
+}
+
+impl<T> Deref for RwLockWriteGuard<'_, T> {
+    type Target = T;
+    
+    fn deref(&self) -> &Self::Target {
+        &*self.guard
+    }
+}
+
+impl<T> DerefMut for RwLockWriteGuard<'_, T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut *self.guard
+    }
+}

kernel/src/syscall.rs

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! System call interface
+use crate::error::Result;
+
+pub fn init() -> Result<()> {
+    Ok(())
+}

kernel/src/task.rs

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Task management
+use crate::error::Result;
+
+pub struct Task;
+
+pub fn init() -> Result<()> {
+    Ok(())
+}

kernel/src/time.rs

@@ -0,0 +1,293 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Time management compatible with Linux kernel
+
+use crate::error::Result;
+use crate::types::{Nanoseconds, Microseconds, Milliseconds, Seconds, Jiffies};
+use core::sync::atomic::{AtomicU64, Ordering};
+
+/// System clock frequency (Hz) - typically 1000 for 1ms ticks
+pub const HZ: u64 = 1000;
+
+/// Nanoseconds per second
+pub const NSEC_PER_SEC: u64 = 1_000_000_000;
+
+/// Nanoseconds per millisecond
+pub const NSEC_PER_MSEC: u64 = 1_000_000;
+
+/// Nanoseconds per microsecond
+pub const NSEC_PER_USEC: u64 = 1_000;
+
+/// Nanoseconds per jiffy
+pub const NSEC_PER_JIFFY: u64 = NSEC_PER_SEC / HZ;
+
+/// Global time counters
+static JIFFIES_COUNTER: AtomicU64 = AtomicU64::new(0);
+static BOOTTIME_NS: AtomicU64 = AtomicU64::new(0);
+
+/// Time structure - Linux compatible
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct TimeSpec {
+    pub sec: i64,
+    pub nsec: i64,
+}
+
+impl TimeSpec {
+    pub const fn new(sec: i64, nsec: i64) -> Self {
+        Self { sec, nsec }
+    }
+    
+    pub fn zero() -> Self {
+        Self::new(0, 0)
+    }
+    
+    pub fn to_ns(&self) -> u64 {
+        (self.sec as u64 * NSEC_PER_SEC) + self.nsec as u64
+    }
+    
+    pub fn from_ns(ns: u64) -> Self {
+        let sec = (ns / NSEC_PER_SEC) as i64;
+        let nsec = (ns % NSEC_PER_SEC) as i64;
+        Self::new(sec, nsec)
+    }
+    
+    pub fn add_ns(&mut self, ns: u64) {
+        let total_ns = self.to_ns() + ns;
+        *self = Self::from_ns(total_ns);
+    }
+    
+    pub fn sub_ns(&mut self, ns: u64) {
+        let total_ns = self.to_ns().saturating_sub(ns);
+        *self = Self::from_ns(total_ns);
+    }
+}
+
+/// High resolution timer structure
+#[derive(Debug, Clone)]
+pub struct HrTimer {
+    pub expires: TimeSpec,
+    pub function: Option<fn()>,
+    pub base: HrTimerBase,
+}
+
+/// Timer bases - Linux compatible
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum HrTimerBase {
+    Monotonic,
+    Realtime,
+    Boottime,
+    Tai,
+}
+
+impl HrTimer {
+    pub fn new(base: HrTimerBase) -> Self {
+        Self {
+            expires: TimeSpec::zero(),
+            function: None,
+            base,
+        }
+    }
+    
+    pub fn set_expires(&mut self, expires: TimeSpec) {
+        self.expires = expires;
+    }
+    
+    pub fn set_function(&mut self, function: fn()) {
+        self.function = Some(function);
+    }
+    
+    pub fn is_expired(&self) -> bool {
+        let now = match self.base {
+            HrTimerBase::Monotonic => get_monotonic_time(),
+            HrTimerBase::Realtime => get_realtime(),
+            HrTimerBase::Boottime => get_boottime(),
+            HrTimerBase::Tai => get_realtime(), // Simplified
+        };
+        now >= self.expires
+    }
+}
+
+/// Initialize time management
+pub fn init() -> Result<()> {
+    // Initialize system clocks
+    let boot_time = read_hardware_clock();
+    BOOTTIME_NS.store(boot_time, Ordering::Relaxed);
+    
+    // TODO: Set up timer interrupts
+    // TODO: Initialize high-resolution timers
+    
+    crate::info!("Time management initialized, boot time: {} ns", boot_time);
+    Ok(())
+}
+
+/// Read hardware clock (placeholder)
+fn read_hardware_clock() -> u64 {
+    // TODO: Read from actual hardware clock (RTC, TSC, etc.)
+    // For now, return a fixed value
+    1609459200_000_000_000 // 2021-01-01 00:00:00 UTC in nanoseconds
+}
+
+/// Get current jiffies count
+pub fn get_jiffies() -> Jiffies {
+    Jiffies(JIFFIES_COUNTER.load(Ordering::Relaxed))
+}
+
+/// Increment jiffies counter (called from timer interrupt)
+pub fn update_jiffies() {
+    JIFFIES_COUNTER.fetch_add(1, Ordering::Relaxed);
+}
+
+/// Get current time in nanoseconds since boot
+pub fn get_time_ns() -> u64 {
+    // TODO: Read from high-resolution clock source (TSC, etc.)
+    // For now, use jiffies-based approximation
+    get_jiffies().0 * NSEC_PER_JIFFY
+}
+
+/// Get monotonic time (time since boot)
+pub fn get_monotonic_time() -> TimeSpec {
+    TimeSpec::from_ns(get_time_ns())
+}
+
+/// Get boot time
+pub fn get_boottime() -> TimeSpec {
+    let boot_ns = BOOTTIME_NS.load(Ordering::Relaxed);
+    let current_ns = get_time_ns();
+    TimeSpec::from_ns(boot_ns + current_ns)
+}
+
+/// Get real time (wall clock time)
+pub fn get_realtime() -> TimeSpec {
+    get_boottime()
+}
+
+/// Convert nanoseconds to jiffies
+pub fn ns_to_jiffies(ns: u64) -> Jiffies {
+    Jiffies(ns / NSEC_PER_JIFFY)
+}
+
+/// Convert jiffies to nanoseconds
+pub fn jiffies_to_ns(jiffies: Jiffies) -> u64 {
+    jiffies.0 * NSEC_PER_JIFFY
+}
+
+/// Convert milliseconds to jiffies
+pub fn msecs_to_jiffies(ms: u64) -> Jiffies {
+    ns_to_jiffies(ms * NSEC_PER_MSEC)
+}
+
+/// Convert jiffies to milliseconds
+pub fn jiffies_to_msecs(jiffies: Jiffies) -> u64 {
+    jiffies_to_ns(jiffies) / NSEC_PER_MSEC
+}
+
+/// Convert microseconds to jiffies
+pub fn usecs_to_jiffies(us: u64) -> Jiffies {
+    ns_to_jiffies(us * NSEC_PER_USEC)
+}
+
+/// Convert jiffies to microseconds
+pub fn jiffies_to_usecs(jiffies: Jiffies) -> u64 {
+    jiffies_to_ns(jiffies) / NSEC_PER_USEC
+}
+
+/// Sleep functions - Linux compatible
+pub fn msleep(ms: u64) {
+    let target_jiffies = get_jiffies().0 + msecs_to_jiffies(ms).0;
+    while get_jiffies().0 < target_jiffies {
+        crate::scheduler::yield_now();
+    }
+}
+
+pub fn usleep_range(min_us: u64, max_us: u64) {
+    let us = (min_us + max_us) / 2; // Use average
+    let target_jiffies = get_jiffies().0 + usecs_to_jiffies(us).0;
+    while get_jiffies().0 < target_jiffies {
+        crate::scheduler::yield_now();
+    }
+}
+
+pub fn ndelay(ns: u64) {
+    // Busy wait for nanoseconds (not recommended for long delays)
+    let start = get_time_ns();
+    while get_time_ns() - start < ns {
+        core::hint::spin_loop();
+    }
+}
+
+pub fn udelay(us: u64) {
+    ndelay(us * NSEC_PER_USEC);
+}
+
+pub fn mdelay(ms: u64) {
+    ndelay(ms * NSEC_PER_MSEC);
+}
+
+/// Timer wheel for managing timers
+#[derive(Debug)]
+pub struct TimerWheel {
+    levels: [Vec<HrTimer>; 8], // Multiple levels for different time ranges
+    current_jiffies: u64,
+}
+
+impl TimerWheel {
+    pub fn new() -> Self {
+        const EMPTY_VEC: Vec<HrTimer> = Vec::new();
+        Self {
+            levels: [EMPTY_VEC; 8],
+            current_jiffies: 0,
+        }
+    }
+    
+    pub fn add_timer(&mut self, timer: HrTimer) {
+        // TODO: Add timer to appropriate level based on expiry time
+        let level = 0; // Simplified
+        self.levels[level].push(timer);
+    }
+    
+    pub fn run_timers(&mut self) {
+        self.current_jiffies = get_jiffies().0;
+        
+        // Check and run expired timers
+        for level in &mut self.levels {
+            level.retain(|timer| {
+                if timer.is_expired() {
+                    if let Some(function) = timer.function {
+                        function();
+                    }
+                    false // Remove expired timer
+                } else {
+                    true // Keep timer
+                }
+            });
+        }
+    }
+}
+
+/// Global timer wheel
+use crate::sync::Spinlock;
+static TIMER_WHEEL: Spinlock<TimerWheel> = Spinlock::new(TimerWheel::new());
+
+/// Add a timer to the system
+pub fn add_timer(timer: HrTimer) {
+    let mut wheel = TIMER_WHEEL.lock();
+    wheel.add_timer(timer);
+}
+
+/// Run expired timers (called from timer interrupt)
+pub fn run_timers() {
+    let mut wheel = TIMER_WHEEL.lock();
+    wheel.run_timers();
+}
+
+/// Timer interrupt handler
+pub fn timer_interrupt() {
+    // Update jiffies
+    update_jiffies();
+    
+    // Run expired timers
+    run_timers();
+    
+    // Update scheduler tick
+    crate::scheduler::scheduler_tick();
+}

kernel/src/types.rs

@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Common kernel types
+
+use core::fmt;
+use core::ops::{Add, Sub};
+
+/// Process ID type
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Pid(pub u32);
+
+impl fmt::Display for Pid {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+/// Thread ID type
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Tid(pub u32);
+
+impl fmt::Display for Tid {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+/// User ID type
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Uid(pub u32);
+
+/// Group ID type  
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Gid(pub u32);
+
+/// Physical address type
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct PhysAddr(pub usize);
+
+impl PhysAddr {
+    pub const fn new(addr: usize) -> Self {
+        Self(addr)
+    }
+    
+    pub const fn as_u64(self) -> u64 {
+        self.0 as u64
+    }
+    
+    pub const fn as_usize(self) -> usize {
+        self.0
+    }
+}
+
+impl Add<usize> for PhysAddr {
+    type Output = Self;
+    
+    fn add(self, rhs: usize) -> Self::Output {
+        Self(self.0 + rhs)
+    }
+}
+
+impl Sub<usize> for PhysAddr {
+    type Output = Self;
+    
+    fn sub(self, rhs: usize) -> Self::Output {
+        Self(self.0 - rhs)
+    }
+}
+
+/// Virtual address type
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct VirtAddr(pub usize);
+
+impl VirtAddr {
+    pub const fn new(addr: usize) -> Self {
+        Self(addr)
+    }
+    
+    pub const fn as_u64(self) -> u64 {
+        self.0 as u64
+    }
+    
+    pub const fn as_usize(self) -> usize {
+        self.0
+    }
+    
+    pub const fn as_ptr<T>(self) -> *const T {
+        self.0 as *const T
+    }
+    
+    pub const fn as_mut_ptr<T>(self) -> *mut T {
+        self.0 as *mut T
+    }
+}
+
+impl Add<usize> for VirtAddr {
+    type Output = Self;
+    
+    fn add(self, rhs: usize) -> Self::Output {
+        Self(self.0 + rhs)
+    }
+}
+
+impl Sub<usize> for VirtAddr {
+    type Output = Self;
+    
+    fn sub(self, rhs: usize) -> Self::Output {
+        Self(self.0 - rhs)
+    }
+}
+
+impl fmt::Display for VirtAddr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "0x{:x}", self.0)
+    }
+}
+
+/// Page size constants
+pub const PAGE_SIZE: usize = 4096;
+pub const PAGE_SHIFT: usize = 12;
+
+/// Page frame number
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Pfn(pub usize);
+
+impl Pfn {
+    pub fn from_phys_addr(addr: PhysAddr) -> Self {
+        Self(addr.0 >> PAGE_SHIFT)
+    }
+    
+    pub fn to_phys_addr(self) -> PhysAddr {
+        PhysAddr(self.0 << PAGE_SHIFT)
+    }
+}
+
+/// CPU number type
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct CpuId(pub u32);
+
+/// IRQ number type
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Irq(pub u32);
+
+/// Time types
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Jiffies(pub u64);
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Nanoseconds(pub u64);
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Microseconds(pub u64);
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Milliseconds(pub u64);
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Seconds(pub u64);

modules/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "modules"
+version = "0.1.0"
+edition = "2021"
+authors = ["Rust Kernel Contributors"]
+description = "Kernel modules"
+license = "GPL-2.0"
+
+[dependencies]
+kernel = { path = "../kernel" }
+
+[[bin]]
+name = "hello_module"
+path = "src/hello.rs"
+
+[[bin]]
+name = "test_module"
+path = "src/test.rs"

modules/src/hello.rs

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Hello World kernel module
+
+#![no_std]
+#![no_main]
+
+use kernel::prelude::*;
+
+struct HelloModule {
+    message: String,
+}
+
+impl kernel::module::Module for HelloModule {
+    fn init(_module: &'static kernel::module::ThisModule) -> Result<Self> {
+        info!("Hello from Rust kernel module!");
+        info!("This is a sample module demonstrating the Rust kernel framework");
+        
+        Ok(HelloModule {
+            message: String::from("Hello, Rust Kernel!"),
+        })
+    }
+    
+    fn exit(_module: &'static kernel::module::ThisModule) {
+        info!("Goodbye from Hello module");
+    }
+}
+
+module! {
+    type: HelloModule,
+    name: "hello_module",
+    author: "Rust Kernel Contributors",
+    description: "A simple hello world module",
+    license: "GPL-2.0",
+}

modules/src/test.rs

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Test kernel module
+
+#![no_std]
+#![no_main]
+
+use kernel::prelude::*;
+
+struct TestModule {
+    test_data: Vec<u32>,
+    counter: u32,
+}
+
+impl kernel::module::Module for TestModule {
+    fn init(_module: &'static kernel::module::ThisModule) -> Result<Self> {
+        info!("Test module initializing...");
+        
+        // Test memory allocation
+        let mut test_data = Vec::new();
+        for i in 0..10 {
+            test_data.push(i * i);
+        }
+        
+        info!("Test data created: {:?}", test_data);
+        
+        // Test synchronization
+        let spinlock = Spinlock::new(42);
+        {
+            let guard = spinlock.lock();
+            info!("Locked value: {}", *guard);
+        }
+        
+        info!("Test module initialized successfully");
+        
+        Ok(TestModule {
+            test_data,
+            counter: 0,
+        })
+    }
+    
+    fn exit(_module: &'static kernel::module::ThisModule) {
+        info!("Test module exiting, counter was: {}", self.counter);
+    }
+}
+
+module! {
+    type: TestModule,
+    name: "test_module", 
+    author: "Rust Kernel Contributors",
+    description: "A test module for kernel functionality",
+    license: "GPL-2.0",
+}

rustfmt.toml

@@ -0,0 +1,30 @@
+# Rust formatting configuration
+# Based on Linux kernel Rust formatting rules
+
+max_width = 100
+hard_tabs = true
+tab_spaces = 8
+newline_style = "Unix"
+use_small_heuristics = "Default"
+
+# Import organization
+imports_layout = "Mixed"
+group_imports = "StdExternalCrate"
+
+# Function formatting
+fn_args_layout = "Tall"
+where_single_line = true
+
+# Control flow
+control_brace_style = "AlwaysSameLine"
+indent_style = "Block"
+
+# Comments
+comment_width = 80
+wrap_comments = true
+normalize_comments = true
+
+# Misc
+format_code_in_doc_comments = true
+format_strings = false
+format_macro_matchers = true

src/lib.rs

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Rust Kernel
+//!
+//! A modern kernel implementation in Rust, inspired by the Linux kernel
+//! and utilizing the Rust for Linux infrastructure.
+
+#![no_std]
+#![no_main]
+
+// Re-export the kernel crate
+pub use kernel;
+
+/// Main kernel entry point
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
+    kernel::kernel_main()
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn basic_test() {
+        assert_eq!(2 + 2, 4);
+    }
+}

test.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# Rust Kernel Test Script
+
+set -e
+
+echo "=== Rust Kernel Build Test ==="
+
+# Check if rust is installed
+if ! command -v cargo &> /dev/null; then
+    echo "Error: Rust/Cargo not found. Please install Rust first."
+    exit 1
+fi
+
+echo "Rust version:"
+rustc --version
+cargo --version
+
+echo ""
+echo "=== Building kernel ==="
+cargo check --workspace
+
+echo ""
+echo "=== Running tests ==="
+cargo test --workspace --lib
+
+echo ""
+echo "=== Checking formatting ==="
+cargo fmt --check || echo "Warning: Code formatting issues found"
+
+echo ""
+echo "=== Running clippy ==="
+cargo clippy --workspace -- -D warnings || echo "Warning: Clippy found issues"
+
+echo ""
+echo "=== Building release version ==="
+cargo build --release
+
+echo ""
+echo "=== Build completed successfully! ==="
+echo "Kernel artifacts can be found in target/release/"