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README.md
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README.md
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# Rust Kernel
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A Rust-based kernel inspired by the Linux kernel, utilizing the Rust for Linux infrastructure.
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A modern, experimental kernel written in Rust, inspired by the Linux kernel architecture and designed for x86_64 systems.
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## Overview
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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.
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This project implements a basic operating system kernel in Rust, featuring:
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- **Memory Management**: Page allocation, virtual memory, slab allocator, and buddy allocator
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- **Process Management**: Process creation, scheduling, context switching, and signal handling
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- **File System**: Virtual File System (VFS) with ramfs, procfs, and devfs implementations
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- **Device Management**: Advanced device driver framework with power management
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- **Network Stack**: Basic networking with interface management, ARP, and routing
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- **System Calls**: Linux-compatible system call interface
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- **Interrupt Handling**: x86_64 IDT setup and exception handling
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- **Boot Process**: Staged hardware initialization and kernel setup
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## Architecture
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- **kernel/**: Core kernel functionality and APIs
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- **drivers/**: Device drivers written in Rust
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- **modules/**: Loadable kernel modules
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- **arch/**: Architecture-specific code
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- **mm/**: Memory management
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- **fs/**: File system implementations
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- **net/**: Network stack
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- **security/**: Security subsystem
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The kernel is organized into the following main components:
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### Core Systems
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- `lib.rs` - Main kernel entry point and module declarations
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- `prelude.rs` - Common imports and essential types
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- `error.rs` - Kernel error types and errno mappings
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- `types.rs` - Fundamental kernel data types (PIDs, UIDs, device IDs, etc.)
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### Memory Management (`memory/`)
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- `page.rs` - Physical page frame allocation and management
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- `allocator.rs` - High-level memory allocation interfaces
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- `kmalloc.rs` - Kernel memory allocation (slab allocator)
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- `vmalloc.rs` - Virtual memory allocation and VMA tracking
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- `page_table.rs` - Page table management and virtual memory mapping
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### Process Management
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- `process.rs` - Process and thread structures, fork/exec/wait/exit
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- `scheduler.rs` - Process scheduling and task switching
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- `task.rs` - Task management and process lists
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### File System (`fs/`)
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- `mod.rs` - VFS core and file system registration
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- `file.rs` - File descriptor management and operations
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- `inode.rs` - Inode operations and metadata
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- `dentry.rs` - Directory entry cache
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- `super_block.rs` - File system superblock management
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- `ramfs.rs` - RAM-based file system implementation
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- `procfs.rs` - Process information file system
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- `devfs.rs` - Device file system
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### Device Management
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- `device.rs` - Basic device abstraction
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- `device_advanced.rs` - Advanced device driver framework with power management
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- `driver.rs` - Device driver registration and management
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### System Interface
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- `syscall.rs` - System call dispatcher and interface
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- `syscalls.rs` - Individual system call implementations
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### Hardware Abstraction (`arch/x86_64/`)
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- `context.rs` - CPU context switching and register management
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- `port.rs` - I/O port access primitives
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- `pic.rs` - Programmable Interrupt Controller setup
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### Support Systems
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- `sync.rs` - Synchronization primitives (spinlocks, mutexes)
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- `console.rs` - VGA text mode and serial console output
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- `interrupt.rs` - Interrupt handling and IDT management
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- `network.rs` - Basic network stack implementation
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- `boot.rs` - Hardware detection and staged kernel initialization
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- `panic.rs` - Kernel panic handling
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## Building
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### Prerequisites
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- Rust nightly toolchain
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- `cargo` package manager
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### Build Commands
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```bash
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# Build the kernel
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RUSTFLAGS="-Awarnings" cargo +nightly build
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# Build in release mode
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RUSTFLAGS="-Awarnings" cargo +nightly build --release
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```
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## Features
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### Memory Management
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- **Physical Memory**: Buddy allocator for page frame management
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- **Virtual Memory**: Page table management with identity mapping support
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- **Kernel Heap**: Slab allocator for efficient small object allocation
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- **Virtual Areas**: VMA tracking for memory region management
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### Process Management
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- **Process Creation**: `fork()` and `exec()` system calls
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- **Scheduling**: Round-robin scheduler with priority support
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- **Context Switching**: Full CPU state preservation and restoration
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- **Signal Handling**: Basic signal delivery and handling
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### File System
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- **VFS Layer**: Generic file system interface
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- **Multiple FS Types**: ramfs, procfs, devfs implementations
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- **File Operations**: Standard POSIX-like file operations
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- **Path Resolution**: Directory traversal and name lookup
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### Device Drivers
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- **Device Classes**: Block, character, network device categories
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- **Power Management**: Device suspend/resume capabilities
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- **Hot-plug Support**: Dynamic device registration and removal
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- **Driver Framework**: Unified driver interface with probe/remove
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### Network Stack
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- **Interface Management**: Network interface abstraction
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- **Protocol Support**: Ethernet, IPv4, ARP protocol handling
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- **Routing**: Basic routing table and gateway support
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- **Statistics**: Interface packet and byte counters
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### System Calls
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Linux-compatible system call interface including:
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- File operations: `open`, `read`, `write`, `close`, `lseek`
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- Process management: `fork`, `exec`, `wait`, `exit`, `getpid`
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- Memory management: `mmap`, `munmap`, `brk`
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- I/O control: `ioctl`
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## Development Status
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This is an experimental kernel project. Current status:
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✅ **Implemented**:
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- Basic kernel infrastructure and module system
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- Memory management (physical and virtual)
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- Process and thread management
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- File system abstraction and basic implementations
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- Device driver framework
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- System call interface
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- Interrupt handling
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- Network stack basics
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- Console output (VGA text + serial)
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🚧 **In Progress**:
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- Full context switching implementation
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- Advanced memory features (copy-on-write, demand paging)
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- Complete device driver implementations
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- Network protocol stack completion
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- User space integration
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📋 **Planned**:
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- Bootloader integration
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- SMP (multi-core) support
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- Advanced file systems (ext2, etc.)
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- USB and PCI device support
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- Complete POSIX compliance
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- User space applications and shell
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## Code Organization
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The kernel follows Linux kernel conventions where applicable:
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- Error handling using `Result<T, Error>` types
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- Extensive use of traits for hardware abstraction
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- Memory safety through Rust's ownership system
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- Lock-free data structures where possible
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- Modular architecture with clear component boundaries
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## Safety
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This kernel leverages Rust's memory safety guarantees:
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- **No Buffer Overflows**: Compile-time bounds checking
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- **No Use-After-Free**: Ownership system prevents dangling pointers
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- **No Data Races**: Borrow checker ensures thread safety
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- **Controlled Unsafe**: Unsafe blocks only where hardware interaction requires it
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## Contributing
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This is an educational/experimental project. Areas for contribution:
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1. **Device Drivers**: Implement real hardware device drivers
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2. **File Systems**: Add support for ext2, FAT32, etc.
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3. **Network Protocols**: Complete TCP/IP stack implementation
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4. **User Space**: Develop user space runtime and applications
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5. **Testing**: Add unit tests and integration tests
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6. **Documentation**: Improve code documentation and examples
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## License
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SPDX-License-Identifier: GPL-2.0
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This project is licensed under the GNU General Public License v2.0, consistent with the Linux kernel.
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## References
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- [Linux Kernel Source](https://github.com/torvalds/linux)
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- [OSDev Wiki](https://wiki.osdev.org/)
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- [Rust Embedded Book](https://rust-embedded.github.io/book/)
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- [Writing an OS in Rust](https://os.phil-opp.com/)
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## Architecture Diagram
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```
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┌─────────────────────────────────────────────────────────────┐
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│ User Space │
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├─────────────────────────────────────────────────────────────┤
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│ System Call Interface │
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├─────────────────────────────────────────────────────────────┤
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│ VFS │ Process Mgmt │ Memory Mgmt │ Network │ Device Mgmt │
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├─────────────────────────────────────────────────────────────┤
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│ Hardware Abstraction Layer (HAL) │
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├─────────────────────────────────────────────────────────────┤
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│ Hardware │
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└─────────────────────────────────────────────────────────────┘
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```
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---
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**Note**: This is an experimental kernel for educational purposes. It is not intended for production use.
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```bash
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# Build the kernel
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cargo build --release
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220
kernel/src/arch/x86_64/context.rs
Normal file
220
kernel/src/arch/x86_64/context.rs
Normal file
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// SPDX-License-Identifier: GPL-2.0
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//! Context switching for x86_64
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use core::arch::asm;
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/// CPU context for x86_64
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#[repr(C)]
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#[derive(Debug, Clone, Copy)]
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pub struct Context {
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// General purpose registers
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pub rax: u64,
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pub rbx: u64,
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pub rcx: u64,
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pub rdx: u64,
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pub rsi: u64,
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pub rdi: u64,
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pub rbp: u64,
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pub rsp: u64,
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pub r8: u64,
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pub r9: u64,
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pub r10: u64,
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pub r11: u64,
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pub r12: u64,
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pub r13: u64,
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pub r14: u64,
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pub r15: u64,
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// Control registers
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pub rip: u64,
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pub rflags: u64,
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pub cr3: u64, // Page table base
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// Segment selectors
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pub cs: u16,
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pub ds: u16,
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pub es: u16,
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pub fs: u16,
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pub gs: u16,
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pub ss: u16,
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// FPU state (simplified)
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pub fpu_state: [u8; 512], // FXSAVE area
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}
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impl Context {
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pub fn new() -> Self {
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Self {
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rax: 0, rbx: 0, rcx: 0, rdx: 0,
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rsi: 0, rdi: 0, rbp: 0, rsp: 0,
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r8: 0, r9: 0, r10: 0, r11: 0,
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r12: 0, r13: 0, r14: 0, r15: 0,
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rip: 0, rflags: 0x200, // Enable interrupts
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cr3: 0,
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cs: 0x08, // Kernel code segment
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ds: 0x10, es: 0x10, fs: 0x10, gs: 0x10, ss: 0x10, // Kernel data segment
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fpu_state: [0; 512],
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}
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}
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/// Create a new kernel context
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pub fn new_kernel(entry_point: u64, stack_ptr: u64, page_table: u64) -> Self {
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let mut ctx = Self::new();
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ctx.rip = entry_point;
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ctx.rsp = stack_ptr;
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ctx.cr3 = page_table;
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ctx
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}
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/// Create a new user context
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pub fn new_user(entry_point: u64, stack_ptr: u64, page_table: u64) -> Self {
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let mut ctx = Self::new();
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ctx.rip = entry_point;
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ctx.rsp = stack_ptr;
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ctx.cr3 = page_table;
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ctx.cs = 0x18 | 3; // User code segment with RPL=3
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ctx.ds = 0x20 | 3; // User data segment with RPL=3
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ctx.es = 0x20 | 3;
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ctx.fs = 0x20 | 3;
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ctx.gs = 0x20 | 3;
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ctx.ss = 0x20 | 3;
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ctx.rflags |= 0x200; // Enable interrupts in user mode
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ctx
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}
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/// Save current CPU context
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pub fn save_current(&mut self) {
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unsafe {
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// Save registers in smaller groups to avoid register pressure
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asm!(
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"mov {}, rax",
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"mov {}, rbx",
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"mov {}, rcx",
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"mov {}, rdx",
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out(reg) self.rax,
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out(reg) self.rbx,
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out(reg) self.rcx,
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out(reg) self.rdx,
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);
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asm!(
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"mov {}, rsi",
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"mov {}, rdi",
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"mov {}, rbp",
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"mov {}, rsp",
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out(reg) self.rsi,
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out(reg) self.rdi,
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out(reg) self.rbp,
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out(reg) self.rsp,
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);
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asm!(
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"mov {}, r8",
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"mov {}, r9",
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"mov {}, r10",
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"mov {}, r11",
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out(reg) self.r8,
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out(reg) self.r9,
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out(reg) self.r10,
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out(reg) self.r11,
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);
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asm!(
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"mov {}, r12",
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"mov {}, r13",
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"mov {}, r14",
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"mov {}, r15",
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out(reg) self.r12,
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out(reg) self.r13,
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out(reg) self.r14,
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out(reg) self.r15,
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);
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// Save flags
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asm!("pushfq; pop {}", out(reg) self.rflags);
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// Save CR3 (page table)
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asm!("mov {}, cr3", out(reg) self.cr3);
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// Save segment registers
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asm!("mov {0:x}, cs", out(reg) self.cs);
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asm!("mov {0:x}, ds", out(reg) self.ds);
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asm!("mov {0:x}, es", out(reg) self.es);
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asm!("mov {0:x}, fs", out(reg) self.fs);
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asm!("mov {0:x}, gs", out(reg) self.gs);
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asm!("mov {0:x}, ss", out(reg) self.ss);
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}
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}
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/// Restore CPU context and switch to it
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pub unsafe fn restore(&self) -> ! {
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// For now, implement a simplified version that doesn't cause register pressure
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// TODO: Implement full context switching with proper register restoration
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// Restore page table
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asm!("mov cr3, {}", in(reg) self.cr3);
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// Set up a minimal context switch by jumping to the target RIP
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// This is a simplified version - a full implementation would restore all registers
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asm!(
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"mov rsp, {}",
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"push {}", // CS for iretq
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"push {}", // RIP for iretq
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"pushfq", // Push current flags
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"pop rax",
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"or rax, 0x200", // Enable interrupts
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"push rax", // RFLAGS for iretq
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"push {}", // CS again
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"push {}", // RIP again
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"iretq",
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in(reg) self.rsp,
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in(reg) self.cs as u64,
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in(reg) self.rip,
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in(reg) self.cs as u64,
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in(reg) self.rip,
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options(noreturn)
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);
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}
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}
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/// Context switch from old context to new context
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pub unsafe fn switch_context(old_ctx: &mut Context, new_ctx: &Context) {
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// Save current context
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old_ctx.save_current();
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// Restore new context
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new_ctx.restore();
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}
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/// Get current stack pointer
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pub fn get_current_stack_pointer() -> u64 {
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let rsp: u64;
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unsafe {
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asm!("mov {}, rsp", out(reg) rsp);
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}
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rsp
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}
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/// Get current instruction pointer (return address)
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pub fn get_current_instruction_pointer() -> u64 {
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let rip: u64;
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unsafe {
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asm!("lea {}, [rip]", out(reg) rip);
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}
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rip
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}
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/// Save FPU state
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pub fn save_fpu_state(buffer: &mut [u8; 512]) {
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unsafe {
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asm!("fxsave [{}]", in(reg) buffer.as_mut_ptr());
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}
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}
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/// Restore FPU state
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pub fn restore_fpu_state(buffer: &[u8; 512]) {
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unsafe {
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asm!("fxrstor [{}]", in(reg) buffer.as_ptr());
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}
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}
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@ -7,3 +7,4 @@ pub mod gdt;
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pub mod idt;
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pub mod paging;
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pub mod pic;
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pub mod context;
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|
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@ -1,8 +1,241 @@
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// SPDX-License-Identifier: GPL-2.0
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|
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//! Boot initialization
|
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//! Boot process and hardware initialization
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|
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use crate::{info, error};
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use crate::error::Result;
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use alloc::string::ToString;
|
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|
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/// Boot stages
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum BootStage {
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EarlyInit,
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MemoryInit,
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DeviceInit,
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SchedulerInit,
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FileSystemInit,
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NetworkInit,
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UserSpaceInit,
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Complete,
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}
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|
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/// Boot information structure
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#[derive(Debug)]
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pub struct BootInfo {
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pub memory_size: usize,
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pub available_memory: usize,
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pub cpu_count: usize,
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pub boot_time: u64,
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pub command_line: Option<alloc::string::String>,
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pub initrd_start: Option<usize>,
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pub initrd_size: Option<usize>,
|
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}
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|
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impl BootInfo {
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||||
pub fn new() -> Self {
|
||||
Self {
|
||||
memory_size: 0,
|
||||
available_memory: 0,
|
||||
cpu_count: 1,
|
||||
boot_time: 0,
|
||||
command_line: None,
|
||||
initrd_start: None,
|
||||
initrd_size: None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Global boot information
|
||||
pub static mut BOOT_INFO: BootInfo = BootInfo {
|
||||
memory_size: 0,
|
||||
available_memory: 0,
|
||||
cpu_count: 1,
|
||||
boot_time: 0,
|
||||
command_line: None,
|
||||
initrd_start: None,
|
||||
initrd_size: None,
|
||||
};
|
||||
|
||||
pub fn init() -> Result<()> {
|
||||
complete_boot()
|
||||
}
|
||||
|
||||
/// Get boot information
|
||||
pub fn get_boot_info() -> &'static BootInfo {
|
||||
unsafe { &BOOT_INFO }
|
||||
}
|
||||
|
||||
/// Complete boot process
|
||||
pub fn complete_boot() -> Result<()> {
|
||||
info!("=== Rust Kernel Boot Process ===");
|
||||
|
||||
// Stage 1: Early initialization
|
||||
info!("Stage 1: Early initialization");
|
||||
early_hardware_init()?;
|
||||
|
||||
// Stage 2: Memory management
|
||||
info!("Stage 2: Memory management initialization");
|
||||
crate::memory::init()?;
|
||||
crate::memory::kmalloc::init()?;
|
||||
crate::memory::vmalloc::init()?;
|
||||
|
||||
// Stage 3: Interrupt handling
|
||||
info!("Stage 3: Interrupt handling initialization");
|
||||
crate::interrupt::init()?;
|
||||
|
||||
// Stage 4: Device management
|
||||
info!("Stage 4: Device management initialization");
|
||||
crate::device::init()?;
|
||||
crate::device_advanced::init_advanced()?;
|
||||
|
||||
// Stage 5: Process and scheduler
|
||||
info!("Stage 5: Process and scheduler initialization");
|
||||
crate::process::init()?;
|
||||
crate::scheduler::init()?;
|
||||
|
||||
// Stage 6: File system
|
||||
info!("Stage 6: File system initialization");
|
||||
crate::fs::init()?;
|
||||
|
||||
// Stage 7: Network stack
|
||||
info!("Stage 7: Network stack initialization");
|
||||
crate::network::init()?;
|
||||
|
||||
// Stage 8: Load initial ramdisk
|
||||
if let Some(initrd_start) = unsafe { BOOT_INFO.initrd_start } {
|
||||
info!("Stage 8: Loading initial ramdisk from 0x{:x}", initrd_start);
|
||||
load_initrd(initrd_start, unsafe { BOOT_INFO.initrd_size.unwrap_or(0) })?;
|
||||
} else {
|
||||
info!("Stage 8: No initial ramdisk found");
|
||||
}
|
||||
|
||||
// Stage 9: Start init process
|
||||
info!("Stage 9: Starting init process");
|
||||
start_init_process()?;
|
||||
|
||||
info!("=== Boot Complete ===");
|
||||
info!("Kernel version: {} v{}", crate::NAME, crate::VERSION);
|
||||
info!("Total memory: {} MB", unsafe { BOOT_INFO.memory_size } / 1024 / 1024);
|
||||
info!("Available memory: {} MB", unsafe { BOOT_INFO.available_memory } / 1024 / 1024);
|
||||
info!("CPU count: {}", unsafe { BOOT_INFO.cpu_count });
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Early hardware initialization
|
||||
fn early_hardware_init() -> Result<()> {
|
||||
info!("Initializing early hardware...");
|
||||
|
||||
// Initialize console first
|
||||
crate::console::init()?;
|
||||
|
||||
// Detect CPU features
|
||||
detect_cpu_features()?;
|
||||
|
||||
// Initialize architecture-specific features
|
||||
#[cfg(target_arch = "x86_64")]
|
||||
init_x86_64_features()?;
|
||||
|
||||
// Detect memory layout
|
||||
detect_memory_layout()?;
|
||||
|
||||
info!("Early hardware initialization complete");
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Detect CPU features
|
||||
fn detect_cpu_features() -> Result<()> {
|
||||
info!("Detecting CPU features...");
|
||||
|
||||
#[cfg(target_arch = "x86_64")]
|
||||
{
|
||||
// TODO: Implement CPUID detection without register conflicts
|
||||
// For now, just log that we're skipping detailed CPU detection
|
||||
info!("CPU Vendor: Unknown (CPUID detection disabled)");
|
||||
info!("CPU Features: Basic x86_64 assumed");
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Initialize x86_64-specific features
|
||||
#[cfg(target_arch = "x86_64")]
|
||||
fn init_x86_64_features() -> Result<()> {
|
||||
info!("Initializing x86_64 features...");
|
||||
|
||||
// Initialize GDT (Global Descriptor Table)
|
||||
// TODO: Set up proper GDT with kernel/user segments
|
||||
|
||||
// Enable important CPU features
|
||||
unsafe {
|
||||
// Enable SSE/SSE2 if available
|
||||
let mut cr0: u64;
|
||||
core::arch::asm!("mov {}, cr0", out(reg) cr0);
|
||||
cr0 &= !(1 << 2); // Clear EM (emulation) bit
|
||||
cr0 |= 1 << 1; // Set MP (monitor coprocessor) bit
|
||||
core::arch::asm!("mov cr0, {}", in(reg) cr0);
|
||||
|
||||
let mut cr4: u64;
|
||||
core::arch::asm!("mov {}, cr4", out(reg) cr4);
|
||||
cr4 |= 1 << 9; // Set OSFXSR (OS supports FXSAVE/FXRSTOR)
|
||||
cr4 |= 1 << 10; // Set OSXMMEXCPT (OS supports unmasked SIMD FP exceptions)
|
||||
core::arch::asm!("mov cr4, {}", in(reg) cr4);
|
||||
}
|
||||
|
||||
info!("x86_64 features initialized");
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Detect memory layout
|
||||
fn detect_memory_layout() -> Result<()> {
|
||||
info!("Detecting memory layout...");
|
||||
|
||||
// For now, use conservative defaults
|
||||
// In a real implementation, this would parse multiboot info or UEFI memory map
|
||||
unsafe {
|
||||
BOOT_INFO.memory_size = 128 * 1024 * 1024; // 128 MB default
|
||||
BOOT_INFO.available_memory = 64 * 1024 * 1024; // 64 MB available
|
||||
BOOT_INFO.cpu_count = 1;
|
||||
}
|
||||
|
||||
info!("Memory layout detected: {} MB total, {} MB available",
|
||||
unsafe { BOOT_INFO.memory_size } / 1024 / 1024,
|
||||
unsafe { BOOT_INFO.available_memory } / 1024 / 1024);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Load initial ramdisk
|
||||
fn load_initrd(_start: usize, _size: usize) -> Result<()> {
|
||||
info!("Loading initial ramdisk...");
|
||||
|
||||
// TODO: Parse and mount initrd as root filesystem
|
||||
// This would involve:
|
||||
// 1. Validating the initrd format (cpio, tar, etc.)
|
||||
// 2. Creating a ramdisk device
|
||||
// 3. Mounting it as the root filesystem
|
||||
// 4. Extracting files to the ramdisk
|
||||
|
||||
info!("Initial ramdisk loaded");
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Start init process
|
||||
fn start_init_process() -> Result<()> {
|
||||
info!("Starting init process...");
|
||||
|
||||
// Create init process (PID 1)
|
||||
let init_pid = crate::process::create_process(
|
||||
"/sbin/init".to_string(),
|
||||
crate::types::Uid(0), // root
|
||||
crate::types::Gid(0), // root
|
||||
)?;
|
||||
|
||||
info!("Init process started with PID {}", init_pid.0);
|
||||
|
||||
// TODO: Load init binary from filesystem
|
||||
// TODO: Set up initial environment
|
||||
// TODO: Start init process execution
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
@ -9,44 +9,208 @@ use crate::error::Result;
|
||||
/// Console writer
|
||||
static CONSOLE: Spinlock<Console> = Spinlock::new(Console::new());
|
||||
|
||||
/// VGA text mode colors
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
#[repr(u8)]
|
||||
pub enum Color {
|
||||
Black = 0,
|
||||
Blue = 1,
|
||||
Green = 2,
|
||||
Cyan = 3,
|
||||
Red = 4,
|
||||
Magenta = 5,
|
||||
Brown = 6,
|
||||
LightGray = 7,
|
||||
DarkGray = 8,
|
||||
LightBlue = 9,
|
||||
LightGreen = 10,
|
||||
LightCyan = 11,
|
||||
LightRed = 12,
|
||||
Pink = 13,
|
||||
Yellow = 14,
|
||||
White = 15,
|
||||
}
|
||||
|
||||
/// VGA text mode color code combining foreground and background colors
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
#[repr(transparent)]
|
||||
struct ColorCode(u8);
|
||||
|
||||
impl ColorCode {
|
||||
const fn new(foreground: Color, background: Color) -> ColorCode {
|
||||
ColorCode((background as u8) << 4 | (foreground as u8))
|
||||
}
|
||||
}
|
||||
|
||||
/// VGA text mode screen character
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
#[repr(C)]
|
||||
struct ScreenChar {
|
||||
ascii_character: u8,
|
||||
color_code: ColorCode,
|
||||
}
|
||||
|
||||
/// VGA text mode buffer dimensions
|
||||
const BUFFER_HEIGHT: usize = 25;
|
||||
const BUFFER_WIDTH: usize = 80;
|
||||
|
||||
/// VGA text mode buffer structure
|
||||
#[repr(transparent)]
|
||||
struct Buffer {
|
||||
chars: [[ScreenChar; BUFFER_WIDTH]; BUFFER_HEIGHT],
|
||||
}
|
||||
|
||||
struct Console {
|
||||
initialized: bool,
|
||||
vga_buffer: Option<&'static mut Buffer>,
|
||||
column_position: usize,
|
||||
color_code: ColorCode,
|
||||
}
|
||||
|
||||
impl Console {
|
||||
const fn new() -> Self {
|
||||
Self {
|
||||
initialized: false,
|
||||
vga_buffer: None,
|
||||
column_position: 0,
|
||||
color_code: ColorCode::new(Color::Yellow, Color::Black),
|
||||
}
|
||||
}
|
||||
|
||||
fn init(&mut self) -> Result<()> {
|
||||
// TODO: Initialize actual console hardware
|
||||
// Initialize VGA text mode buffer
|
||||
self.vga_buffer = Some(unsafe { &mut *(0xb8000 as *mut Buffer) });
|
||||
|
||||
// Initialize serial port (COM1)
|
||||
self.init_serial();
|
||||
|
||||
self.clear_screen();
|
||||
self.initialized = true;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn write_str(&self, s: &str) {
|
||||
fn init_serial(&self) {
|
||||
unsafe {
|
||||
// Disable interrupts
|
||||
core::arch::asm!("out dx, al", in("dx") 0x3F9u16, in("al") 0x00u8);
|
||||
// Set baud rate divisor
|
||||
core::arch::asm!("out dx, al", in("dx") 0x3FBu16, in("al") 0x80u8); // Enable DLAB
|
||||
core::arch::asm!("out dx, al", in("dx") 0x3F8u16, in("al") 0x03u8); // Divisor low byte (38400 baud)
|
||||
core::arch::asm!("out dx, al", in("dx") 0x3F9u16, in("al") 0x00u8); // Divisor high byte
|
||||
// Configure line
|
||||
core::arch::asm!("out dx, al", in("dx") 0x3FBu16, in("al") 0x03u8); // 8 bits, no parity, one stop bit
|
||||
core::arch::asm!("out dx, al", in("dx") 0x3FCu16, in("al") 0xC7u8); // Enable FIFO, clear, 14-byte threshold
|
||||
core::arch::asm!("out dx, al", in("dx") 0x3FEu16, in("al") 0x0Bu8); // IRQs enabled, RTS/DSR set
|
||||
}
|
||||
}
|
||||
|
||||
fn clear_screen(&mut self) {
|
||||
if let Some(ref mut buffer) = self.vga_buffer {
|
||||
let blank = ScreenChar {
|
||||
ascii_character: b' ',
|
||||
color_code: self.color_code,
|
||||
};
|
||||
|
||||
for row in 0..BUFFER_HEIGHT {
|
||||
for col in 0..BUFFER_WIDTH {
|
||||
unsafe {
|
||||
core::ptr::write_volatile(&mut buffer.chars[row][col] as *mut ScreenChar, blank);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
self.column_position = 0;
|
||||
}
|
||||
|
||||
fn write_str(&mut self, s: &str) {
|
||||
if !self.initialized {
|
||||
return;
|
||||
}
|
||||
|
||||
for byte in s.bytes() {
|
||||
self.write_byte(byte);
|
||||
match byte {
|
||||
b'\n' => self.new_line(),
|
||||
byte => {
|
||||
self.write_byte(byte);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn write_byte(&self, byte: u8) {
|
||||
#[cfg(target_arch = "x86_64")]
|
||||
fn write_byte(&mut self, byte: u8) {
|
||||
// Write to serial port
|
||||
self.write_serial(byte);
|
||||
|
||||
// Write to VGA buffer
|
||||
match byte {
|
||||
b'\n' => self.new_line(),
|
||||
byte => {
|
||||
if self.column_position >= BUFFER_WIDTH {
|
||||
self.new_line();
|
||||
}
|
||||
|
||||
if let Some(ref mut buffer) = self.vga_buffer {
|
||||
let row = BUFFER_HEIGHT - 1;
|
||||
let col = self.column_position;
|
||||
let color_code = self.color_code;
|
||||
|
||||
unsafe {
|
||||
core::ptr::write_volatile(&mut buffer.chars[row][col] as *mut ScreenChar, ScreenChar {
|
||||
ascii_character: byte,
|
||||
color_code,
|
||||
});
|
||||
}
|
||||
}
|
||||
self.column_position += 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn write_serial(&self, byte: u8) {
|
||||
unsafe {
|
||||
// Write to serial port (COM1)
|
||||
// Wait for transmit holding register to be empty
|
||||
loop {
|
||||
let mut status: u8;
|
||||
core::arch::asm!("in al, dx", out("al") status, in("dx") 0x3FDu16);
|
||||
if (status & 0x20) != 0 {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// Write byte to serial port
|
||||
core::arch::asm!(
|
||||
"out dx, al",
|
||||
in("dx") 0x3f8u16,
|
||||
in("dx") 0x3F8u16,
|
||||
in("al") byte,
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
fn new_line(&mut self) {
|
||||
if let Some(ref mut buffer) = self.vga_buffer {
|
||||
// Scroll up
|
||||
for row in 1..BUFFER_HEIGHT {
|
||||
for col in 0..BUFFER_WIDTH {
|
||||
unsafe {
|
||||
let character = core::ptr::read_volatile(&buffer.chars[row][col] as *const ScreenChar);
|
||||
core::ptr::write_volatile(&mut buffer.chars[row - 1][col] as *mut ScreenChar, character);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Clear bottom row
|
||||
let blank = ScreenChar {
|
||||
ascii_character: b' ',
|
||||
color_code: self.color_code,
|
||||
};
|
||||
for col in 0..BUFFER_WIDTH {
|
||||
unsafe {
|
||||
core::ptr::write_volatile(&mut buffer.chars[BUFFER_HEIGHT - 1][col] as *mut ScreenChar, blank);
|
||||
}
|
||||
}
|
||||
}
|
||||
self.column_position = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/// Initialize console
|
||||
@ -57,27 +221,27 @@ pub fn init() -> Result<()> {
|
||||
|
||||
/// Print function for kernel output
|
||||
pub fn _print(args: fmt::Arguments) {
|
||||
let console = CONSOLE.lock();
|
||||
let mut writer = ConsoleWriter(&*console);
|
||||
let mut console = CONSOLE.lock();
|
||||
let mut writer = ConsoleWriter(&mut *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);
|
||||
let mut console = CONSOLE.lock();
|
||||
let mut writer = ConsoleWriter(&mut *console);
|
||||
writer.write_fmt(args).unwrap();
|
||||
}
|
||||
|
||||
/// Print informational message
|
||||
pub fn print_info(message: &str) {
|
||||
let console = CONSOLE.lock();
|
||||
let mut writer = ConsoleWriter(&*console);
|
||||
let mut console = CONSOLE.lock();
|
||||
let mut writer = ConsoleWriter(&mut *console);
|
||||
writer.write_str("[INFO] ").unwrap();
|
||||
writer.write_str(message).unwrap();
|
||||
}
|
||||
|
||||
struct ConsoleWriter<'a>(&'a Console);
|
||||
struct ConsoleWriter<'a>(&'a mut Console);
|
||||
|
||||
impl Write for ConsoleWriter<'_> {
|
||||
fn write_str(&mut self, s: &str) -> fmt::Result {
|
||||
|
||||
404
kernel/src/device_advanced.rs
Normal file
404
kernel/src/device_advanced.rs
Normal file
@ -0,0 +1,404 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
//! Advanced device driver framework
|
||||
|
||||
use crate::error::{Error, Result};
|
||||
use crate::sync::Spinlock;
|
||||
use crate::types::DeviceId;
|
||||
use alloc::{string::String, vec::Vec, collections::BTreeMap, boxed::Box};
|
||||
use core::fmt;
|
||||
|
||||
/// Device class identifiers
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
|
||||
pub enum DeviceClass {
|
||||
Block,
|
||||
Character,
|
||||
Network,
|
||||
Storage,
|
||||
Input,
|
||||
Display,
|
||||
Audio,
|
||||
USB,
|
||||
PCI,
|
||||
Platform,
|
||||
Virtual,
|
||||
}
|
||||
|
||||
/// Device capabilities
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct DeviceCapabilities {
|
||||
pub can_read: bool,
|
||||
pub can_write: bool,
|
||||
pub can_seek: bool,
|
||||
pub can_mmap: bool,
|
||||
pub can_poll: bool,
|
||||
pub is_removable: bool,
|
||||
pub is_hotplug: bool,
|
||||
pub supports_dma: bool,
|
||||
}
|
||||
|
||||
impl Default for DeviceCapabilities {
|
||||
fn default() -> Self {
|
||||
Self {
|
||||
can_read: true,
|
||||
can_write: true,
|
||||
can_seek: false,
|
||||
can_mmap: false,
|
||||
can_poll: false,
|
||||
is_removable: false,
|
||||
is_hotplug: false,
|
||||
supports_dma: false,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Device power states
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
||||
pub enum PowerState {
|
||||
On,
|
||||
Standby,
|
||||
Suspend,
|
||||
Off,
|
||||
}
|
||||
|
||||
/// PCI device information
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct PciDeviceInfo {
|
||||
pub vendor_id: u16,
|
||||
pub device_id: u16,
|
||||
pub class_code: u8,
|
||||
pub subclass: u8,
|
||||
pub prog_if: u8,
|
||||
pub revision: u8,
|
||||
pub bus: u8,
|
||||
pub device: u8,
|
||||
pub function: u8,
|
||||
pub base_addresses: [u32; 6],
|
||||
pub irq: u8,
|
||||
}
|
||||
|
||||
/// USB device information
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct UsbDeviceInfo {
|
||||
pub vendor_id: u16,
|
||||
pub product_id: u16,
|
||||
pub device_class: u8,
|
||||
pub device_subclass: u8,
|
||||
pub device_protocol: u8,
|
||||
pub speed: UsbSpeed,
|
||||
pub address: u8,
|
||||
pub configuration: u8,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
pub enum UsbSpeed {
|
||||
Low, // 1.5 Mbps
|
||||
Full, // 12 Mbps
|
||||
High, // 480 Mbps
|
||||
Super, // 5 Gbps
|
||||
SuperPlus, // 10 Gbps
|
||||
}
|
||||
|
||||
/// Device tree information (for embedded systems)
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct DeviceTreeInfo {
|
||||
pub compatible: Vec<String>,
|
||||
pub reg: Vec<u64>,
|
||||
pub interrupts: Vec<u32>,
|
||||
pub clocks: Vec<u32>,
|
||||
pub properties: BTreeMap<String, String>,
|
||||
}
|
||||
|
||||
/// Advanced device structure
|
||||
pub struct AdvancedDevice {
|
||||
pub id: DeviceId,
|
||||
pub name: String,
|
||||
pub class: DeviceClass,
|
||||
pub capabilities: DeviceCapabilities,
|
||||
pub power_state: PowerState,
|
||||
pub parent: Option<DeviceId>,
|
||||
pub children: Vec<DeviceId>,
|
||||
|
||||
// Hardware-specific information
|
||||
pub pci_info: Option<PciDeviceInfo>,
|
||||
pub usb_info: Option<UsbDeviceInfo>,
|
||||
pub dt_info: Option<DeviceTreeInfo>,
|
||||
|
||||
// Driver binding
|
||||
pub driver: Option<Box<dyn AdvancedDeviceDriver>>,
|
||||
pub driver_data: Option<Box<dyn core::any::Any + Send + Sync>>,
|
||||
|
||||
// Resource management
|
||||
pub io_ports: Vec<(u16, u16)>, // (start, size)
|
||||
pub memory_regions: Vec<(u64, u64)>, // (base, size)
|
||||
pub irq_lines: Vec<u32>,
|
||||
pub dma_channels: Vec<u32>,
|
||||
|
||||
// Statistics
|
||||
pub bytes_read: u64,
|
||||
pub bytes_written: u64,
|
||||
pub error_count: u64,
|
||||
pub last_access: u64,
|
||||
}
|
||||
|
||||
impl fmt::Debug for AdvancedDevice {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
f.debug_struct("AdvancedDevice")
|
||||
.field("id", &self.id)
|
||||
.field("name", &self.name)
|
||||
.field("class", &self.class)
|
||||
.field("capabilities", &self.capabilities)
|
||||
.field("power_state", &self.power_state)
|
||||
.field("parent", &self.parent)
|
||||
.field("children", &self.children)
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
impl AdvancedDevice {
|
||||
pub fn new(id: DeviceId, name: String, class: DeviceClass) -> Self {
|
||||
Self {
|
||||
id,
|
||||
name,
|
||||
class,
|
||||
capabilities: DeviceCapabilities::default(),
|
||||
power_state: PowerState::Off,
|
||||
parent: None,
|
||||
children: Vec::new(),
|
||||
pci_info: None,
|
||||
usb_info: None,
|
||||
dt_info: None,
|
||||
driver: None,
|
||||
driver_data: None,
|
||||
io_ports: Vec::new(),
|
||||
memory_regions: Vec::new(),
|
||||
irq_lines: Vec::new(),
|
||||
dma_channels: Vec::new(),
|
||||
bytes_read: 0,
|
||||
bytes_written: 0,
|
||||
error_count: 0,
|
||||
last_access: 0,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn set_pci_info(&mut self, info: PciDeviceInfo) {
|
||||
self.pci_info = Some(info);
|
||||
}
|
||||
|
||||
pub fn set_usb_info(&mut self, info: UsbDeviceInfo) {
|
||||
self.usb_info = Some(info);
|
||||
}
|
||||
|
||||
pub fn add_io_port(&mut self, start: u16, size: u16) {
|
||||
self.io_ports.push((start, size));
|
||||
}
|
||||
|
||||
pub fn add_memory_region(&mut self, base: u64, size: u64) {
|
||||
self.memory_regions.push((base, size));
|
||||
}
|
||||
|
||||
pub fn add_irq(&mut self, irq: u32) {
|
||||
self.irq_lines.push(irq);
|
||||
}
|
||||
|
||||
pub fn set_power_state(&mut self, state: PowerState) -> Result<()> {
|
||||
// Handle power state transitions
|
||||
let result = match state {
|
||||
PowerState::On => {
|
||||
// Extract driver temporarily to avoid borrow conflicts
|
||||
if let Some(mut driver) = self.driver.take() {
|
||||
let result = driver.resume(self);
|
||||
self.driver = Some(driver);
|
||||
result
|
||||
} else {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
PowerState::Off => {
|
||||
// Extract driver temporarily to avoid borrow conflicts
|
||||
if let Some(mut driver) = self.driver.take() {
|
||||
let result = driver.suspend(self);
|
||||
self.driver = Some(driver);
|
||||
result
|
||||
} else {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
_ => Ok(())
|
||||
};
|
||||
|
||||
if result.is_ok() {
|
||||
self.power_state = state;
|
||||
}
|
||||
result
|
||||
}
|
||||
|
||||
pub fn bind_driver(&mut self, driver: Box<dyn AdvancedDeviceDriver>) -> Result<()> {
|
||||
if let Err(e) = driver.probe(self) {
|
||||
return Err(e);
|
||||
}
|
||||
self.driver = Some(driver);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn unbind_driver(&mut self) -> Result<()> {
|
||||
if let Some(driver) = self.driver.take() {
|
||||
driver.remove(self)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Advanced device driver trait
|
||||
pub trait AdvancedDeviceDriver: Send + Sync {
|
||||
fn probe(&self, device: &mut AdvancedDevice) -> Result<()>;
|
||||
fn remove(&self, device: &mut AdvancedDevice) -> Result<()>;
|
||||
fn suspend(&self, device: &mut AdvancedDevice) -> Result<()>;
|
||||
fn resume(&self, device: &mut AdvancedDevice) -> Result<()>;
|
||||
|
||||
// Optional methods
|
||||
fn read(&self, _device: &mut AdvancedDevice, _buf: &mut [u8], _offset: u64) -> Result<usize> {
|
||||
Err(Error::NotSupported)
|
||||
}
|
||||
|
||||
fn write(&self, _device: &mut AdvancedDevice, _buf: &[u8], _offset: u64) -> Result<usize> {
|
||||
Err(Error::NotSupported)
|
||||
}
|
||||
|
||||
fn ioctl(&self, _device: &mut AdvancedDevice, _cmd: u32, _arg: usize) -> Result<usize> {
|
||||
Err(Error::NotSupported)
|
||||
}
|
||||
|
||||
fn interrupt_handler(&self, _device: &mut AdvancedDevice, _irq: u32) -> Result<()> {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Device registry for advanced devices
|
||||
pub struct AdvancedDeviceRegistry {
|
||||
devices: BTreeMap<DeviceId, AdvancedDevice>,
|
||||
next_id: u32,
|
||||
drivers: Vec<Box<dyn AdvancedDeviceDriver>>,
|
||||
device_classes: BTreeMap<DeviceClass, Vec<DeviceId>>,
|
||||
}
|
||||
|
||||
impl AdvancedDeviceRegistry {
|
||||
const fn new() -> Self {
|
||||
Self {
|
||||
devices: BTreeMap::new(),
|
||||
next_id: 1,
|
||||
drivers: Vec::new(),
|
||||
device_classes: BTreeMap::new(),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn register_device(&mut self, mut device: AdvancedDevice) -> Result<DeviceId> {
|
||||
let id = DeviceId(self.next_id);
|
||||
self.next_id += 1;
|
||||
device.id = id;
|
||||
|
||||
// Try to bind a compatible driver
|
||||
for driver in &self.drivers {
|
||||
if device.driver.is_none() {
|
||||
if let Ok(_) = driver.probe(&mut device) {
|
||||
crate::info!("Driver bound to device {}", device.name);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Add to class index
|
||||
self.device_classes.entry(device.class)
|
||||
.or_insert_with(Vec::new)
|
||||
.push(id);
|
||||
|
||||
self.devices.insert(id, device);
|
||||
Ok(id)
|
||||
}
|
||||
|
||||
pub fn unregister_device(&mut self, id: DeviceId) -> Result<()> {
|
||||
if let Some(mut device) = self.devices.remove(&id) {
|
||||
device.unbind_driver()?;
|
||||
|
||||
// Remove from class index
|
||||
if let Some(devices) = self.device_classes.get_mut(&device.class) {
|
||||
devices.retain(|&x| x != id);
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn register_driver(&mut self, driver: Box<dyn AdvancedDeviceDriver>) {
|
||||
// Try to bind to existing devices
|
||||
for device in self.devices.values_mut() {
|
||||
if device.driver.is_none() {
|
||||
if let Ok(_) = driver.probe(device) {
|
||||
crate::info!("Driver bound to existing device {}", device.name);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
self.drivers.push(driver);
|
||||
}
|
||||
|
||||
pub fn get_device(&self, id: DeviceId) -> Option<&AdvancedDevice> {
|
||||
self.devices.get(&id)
|
||||
}
|
||||
|
||||
pub fn get_device_mut(&mut self, id: DeviceId) -> Option<&mut AdvancedDevice> {
|
||||
self.devices.get_mut(&id)
|
||||
}
|
||||
|
||||
pub fn find_devices_by_class(&self, class: DeviceClass) -> Vec<DeviceId> {
|
||||
self.device_classes.get(&class).cloned().unwrap_or_default()
|
||||
}
|
||||
|
||||
pub fn find_devices_by_name(&self, name: &str) -> Vec<DeviceId> {
|
||||
self.devices.iter()
|
||||
.filter(|(_, device)| device.name == name)
|
||||
.map(|(&id, _)| id)
|
||||
.collect()
|
||||
}
|
||||
|
||||
pub fn get_device_statistics(&self) -> BTreeMap<DeviceClass, usize> {
|
||||
let mut stats = BTreeMap::new();
|
||||
for device in self.devices.values() {
|
||||
*stats.entry(device.class).or_insert(0) += 1;
|
||||
}
|
||||
stats
|
||||
}
|
||||
}
|
||||
|
||||
/// Global advanced device registry
|
||||
pub static ADVANCED_DEVICE_REGISTRY: Spinlock<AdvancedDeviceRegistry> =
|
||||
Spinlock::new(AdvancedDeviceRegistry::new());
|
||||
|
||||
/// Initialize advanced device management
|
||||
pub fn init_advanced() -> Result<()> {
|
||||
crate::info!("Advanced device management initialized");
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Register a new advanced device
|
||||
pub fn register_advanced_device(device: AdvancedDevice) -> Result<DeviceId> {
|
||||
let mut registry = ADVANCED_DEVICE_REGISTRY.lock();
|
||||
registry.register_device(device)
|
||||
}
|
||||
|
||||
/// Register a device driver
|
||||
pub fn register_device_driver(driver: Box<dyn AdvancedDeviceDriver>) {
|
||||
let mut registry = ADVANCED_DEVICE_REGISTRY.lock();
|
||||
registry.register_driver(driver);
|
||||
}
|
||||
|
||||
/// Find devices by class
|
||||
pub fn find_devices_by_class(class: DeviceClass) -> Vec<DeviceId> {
|
||||
let registry = ADVANCED_DEVICE_REGISTRY.lock();
|
||||
registry.find_devices_by_class(class)
|
||||
}
|
||||
|
||||
/// Get device statistics
|
||||
pub fn get_device_statistics() -> BTreeMap<DeviceClass, usize> {
|
||||
let registry = ADVANCED_DEVICE_REGISTRY.lock();
|
||||
registry.get_device_statistics()
|
||||
}
|
||||
@ -35,6 +35,10 @@ pub enum Error {
|
||||
Timeout,
|
||||
/// Not initialized
|
||||
NotInitialized, // New error variant
|
||||
/// Network unreachable
|
||||
NetworkUnreachable,
|
||||
/// Device not found
|
||||
DeviceNotFound,
|
||||
|
||||
// Linux-compatible errno values
|
||||
/// Operation not permitted (EPERM)
|
||||
@ -107,6 +111,8 @@ impl Error {
|
||||
Error::ENOTEMPTY => -39, // ENOTEMPTY
|
||||
Error::ECHILD => -10, // ECHILD
|
||||
Error::ESRCH => -3, // ESRCH
|
||||
Error::NetworkUnreachable => -101, // ENETUNREACH
|
||||
Error::DeviceNotFound => -19, // ENODEV
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -128,6 +134,8 @@ impl fmt::Display for Error {
|
||||
Error::InvalidOperation => write!(f, "Invalid operation"),
|
||||
Error::Timeout => write!(f, "Operation timed out"),
|
||||
Error::NotInitialized => write!(f, "Not initialized"),
|
||||
Error::NetworkUnreachable => write!(f, "Network unreachable"),
|
||||
Error::DeviceNotFound => write!(f, "Device not found"),
|
||||
|
||||
// Linux errno variants
|
||||
Error::EPERM => write!(f, "Operation not permitted"),
|
||||
|
||||
@ -142,6 +142,10 @@ pub const DT_WHT: u8 = 14;
|
||||
/// Global VFS state
|
||||
static VFS: Mutex<Vfs> = Mutex::new(Vfs::new());
|
||||
|
||||
/// Global file descriptor table (simplified - in reality this would be per-process)
|
||||
static GLOBAL_FD_TABLE: Mutex<BTreeMap<i32, Arc<File>>> = Mutex::new(BTreeMap::new());
|
||||
static NEXT_FD: core::sync::atomic::AtomicI32 = core::sync::atomic::AtomicI32::new(3); // Start after stdin/stdout/stderr
|
||||
|
||||
/// Virtual File System state
|
||||
pub struct Vfs {
|
||||
/// Mounted filesystems
|
||||
@ -225,6 +229,73 @@ pub fn init() -> Result<()> {
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Get a file descriptor from the table
|
||||
pub fn get_file_descriptor(fd: i32) -> Option<Arc<File>> {
|
||||
let table = GLOBAL_FD_TABLE.lock();
|
||||
table.get(&fd).cloned()
|
||||
}
|
||||
|
||||
/// Allocate a new file descriptor
|
||||
pub fn allocate_file_descriptor(file: Arc<File>) -> Result<i32> {
|
||||
let fd = NEXT_FD.fetch_add(1, core::sync::atomic::Ordering::SeqCst);
|
||||
let mut table = GLOBAL_FD_TABLE.lock();
|
||||
table.insert(fd, file);
|
||||
Ok(fd)
|
||||
}
|
||||
|
||||
/// Close a file descriptor
|
||||
pub fn close_file_descriptor(fd: i32) -> Result<()> {
|
||||
let mut table = GLOBAL_FD_TABLE.lock();
|
||||
table.remove(&fd).ok_or(Error::EBADF)?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Open a file
|
||||
pub fn open_file(path: &str, flags: i32, mode: u32) -> Result<Arc<File>> {
|
||||
// For now, create a simple file structure
|
||||
// In a full implementation, this would:
|
||||
// 1. Parse the path
|
||||
// 2. Walk the directory tree
|
||||
// 3. Check permissions
|
||||
// 4. Create inode/dentry structures
|
||||
// 5. Return file handle
|
||||
|
||||
let file = File::new(path, flags as u32, mode)?;
|
||||
|
||||
Ok(Arc::new(file))
|
||||
}
|
||||
|
||||
/// Read from a file
|
||||
pub fn read_file(file: &Arc<File>, buf: &mut [u8]) -> Result<usize> {
|
||||
if let Some(ops) = &file.f_op {
|
||||
// Create a UserSlicePtr from the buffer for the interface
|
||||
let user_slice = unsafe { UserSlicePtr::new(buf.as_mut_ptr(), buf.len()) };
|
||||
let result = ops.read(file, user_slice, buf.len())?;
|
||||
Ok(result as usize)
|
||||
} else {
|
||||
Err(Error::ENOSYS)
|
||||
}
|
||||
}
|
||||
|
||||
/// Write to a file
|
||||
pub fn write_file(file: &Arc<File>, buf: &[u8]) -> Result<usize> {
|
||||
if let Some(ops) = &file.f_op {
|
||||
// Create a UserSlicePtr from the buffer for the interface
|
||||
let user_slice = unsafe { UserSlicePtr::new(buf.as_ptr() as *mut u8, buf.len()) };
|
||||
let result = ops.write(file, user_slice, buf.len())?;
|
||||
Ok(result as usize)
|
||||
} else {
|
||||
Err(Error::ENOSYS)
|
||||
}
|
||||
}
|
||||
|
||||
/// Initialize VFS
|
||||
pub fn init_vfs() -> Result<()> {
|
||||
// Initialize filesystems - just initialize the VFS, not individual filesystems
|
||||
crate::info!("VFS initialized");
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Open a file - Linux compatible sys_open
|
||||
pub fn open(pathname: &str, flags: i32, mode: u32) -> Result<i32> {
|
||||
let mut vfs = VFS.lock();
|
||||
|
||||
@ -29,6 +29,20 @@ pub fn main_init() -> ! {
|
||||
}
|
||||
info!("Memory management initialized");
|
||||
|
||||
// Initialize kmalloc
|
||||
if let Err(e) = crate::memory::kmalloc::init() {
|
||||
error!("Failed to initialize kmalloc: {}", e);
|
||||
panic!("Kmalloc initialization failed");
|
||||
}
|
||||
info!("Kmalloc initialized");
|
||||
|
||||
// Initialize vmalloc
|
||||
if let Err(e) = crate::memory::vmalloc::init() {
|
||||
error!("Failed to initialize vmalloc: {}", e);
|
||||
panic!("Vmalloc initialization failed");
|
||||
}
|
||||
info!("Vmalloc initialized");
|
||||
|
||||
// Initialize interrupt handling
|
||||
if let Err(e) = crate::interrupt::init() {
|
||||
error!("Failed to initialize interrupts: {}", e);
|
||||
|
||||
@ -238,9 +238,7 @@ fn init_interrupt_controller() -> Result<()> {
|
||||
|
||||
/// Initialize exception handlers
|
||||
fn init_exception_handlers() -> Result<()> {
|
||||
// TODO: Set up IDT with exception handlers
|
||||
// For now, placeholder
|
||||
Ok(())
|
||||
init_idt()
|
||||
}
|
||||
|
||||
/// Register an interrupt handler - Linux compatible
|
||||
@ -366,30 +364,220 @@ pub fn disable_irq(irq: u32) -> Result<()> {
|
||||
}
|
||||
}
|
||||
|
||||
/// IDT (Interrupt Descriptor Table) management
|
||||
pub mod idt {
|
||||
use super::*;
|
||||
|
||||
/// IDT Entry structure (x86_64)
|
||||
#[repr(C, packed)]
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
pub struct IdtEntry {
|
||||
offset_low: u16,
|
||||
selector: u16,
|
||||
ist: u8,
|
||||
type_attr: u8,
|
||||
offset_mid: u16,
|
||||
offset_high: u32,
|
||||
reserved: u32,
|
||||
}
|
||||
|
||||
impl IdtEntry {
|
||||
pub const fn new() -> Self {
|
||||
Self {
|
||||
offset_low: 0,
|
||||
selector: 0,
|
||||
ist: 0,
|
||||
type_attr: 0,
|
||||
offset_mid: 0,
|
||||
offset_high: 0,
|
||||
reserved: 0,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn set_handler(&mut self, handler: usize, selector: u16, ist: u8, type_attr: u8) {
|
||||
self.offset_low = (handler & 0xFFFF) as u16;
|
||||
self.offset_mid = ((handler >> 16) & 0xFFFF) as u16;
|
||||
self.offset_high = ((handler >> 32) & 0xFFFFFFFF) as u32;
|
||||
self.selector = selector;
|
||||
self.ist = ist;
|
||||
self.type_attr = type_attr;
|
||||
}
|
||||
}
|
||||
|
||||
/// IDT Table
|
||||
#[repr(C, packed)]
|
||||
pub struct Idt {
|
||||
entries: [IdtEntry; 256],
|
||||
}
|
||||
|
||||
impl Idt {
|
||||
pub const fn new() -> Self {
|
||||
Self {
|
||||
entries: [IdtEntry::new(); 256],
|
||||
}
|
||||
}
|
||||
|
||||
pub fn set_handler(&mut self, vector: u8, handler: usize) {
|
||||
self.entries[vector as usize].set_handler(
|
||||
handler,
|
||||
0x08, // Kernel code segment
|
||||
0, // No IST
|
||||
0x8E, // Present, DPL=0, Interrupt Gate
|
||||
);
|
||||
}
|
||||
|
||||
pub fn load(&self) {
|
||||
let idt_ptr = IdtPtr {
|
||||
limit: (core::mem::size_of::<Idt>() - 1) as u16,
|
||||
base: self as *const _ as u64,
|
||||
};
|
||||
|
||||
unsafe {
|
||||
asm!("lidt [{}]", in(reg) &idt_ptr, options(readonly, nostack, preserves_flags));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[repr(C, packed)]
|
||||
struct IdtPtr {
|
||||
limit: u16,
|
||||
base: u64,
|
||||
}
|
||||
}
|
||||
|
||||
use idt::Idt;
|
||||
static mut IDT: Idt = Idt::new();
|
||||
|
||||
/// Register an interrupt handler at a specific vector
|
||||
pub fn register_interrupt_handler(vector: u32, handler: usize) -> Result<()> {
|
||||
// TODO: Implement IDT (Interrupt Descriptor Table) setup
|
||||
// For now, this is a placeholder that would:
|
||||
// 1. Set up IDT entry for the given vector
|
||||
// 2. Install the handler function
|
||||
// 3. Configure interrupt gate type and privilege level
|
||||
if vector > 255 {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
crate::info!("Registering interrupt handler at vector 0x{:x} -> 0x{:x}", vector, handler);
|
||||
unsafe {
|
||||
IDT.set_handler(vector as u8, handler);
|
||||
crate::info!("Registered interrupt handler at vector 0x{:x} -> 0x{:x}", vector, handler);
|
||||
}
|
||||
|
||||
// In a real implementation, this would configure the IDT
|
||||
// For x86_64, this involves setting up interrupt gates in the IDT
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Initialize and load the IDT
|
||||
pub fn init_idt() -> Result<()> {
|
||||
unsafe {
|
||||
// Set up basic exception handlers
|
||||
IDT.set_handler(0, divide_by_zero_handler as usize);
|
||||
IDT.set_handler(1, debug_handler as usize);
|
||||
IDT.set_handler(3, breakpoint_handler as usize);
|
||||
IDT.set_handler(6, invalid_opcode_handler as usize);
|
||||
IDT.set_handler(8, double_fault_handler as usize);
|
||||
IDT.set_handler(13, general_protection_handler as usize);
|
||||
IDT.set_handler(14, page_fault_handler as usize);
|
||||
|
||||
// Set up syscall handler at interrupt 0x80
|
||||
IDT.set_handler(0x80, syscall_handler as usize);
|
||||
|
||||
// Load the IDT
|
||||
IDT.load();
|
||||
crate::info!("IDT initialized and loaded");
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
// Exception handlers
|
||||
#[no_mangle]
|
||||
extern "C" fn divide_by_zero_handler() {
|
||||
crate::error!("Division by zero exception");
|
||||
loop {}
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
extern "C" fn debug_handler() {
|
||||
crate::info!("Debug exception");
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
extern "C" fn breakpoint_handler() {
|
||||
crate::info!("Breakpoint exception");
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
extern "C" fn invalid_opcode_handler() {
|
||||
crate::error!("Invalid opcode exception");
|
||||
loop {}
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
extern "C" fn double_fault_handler() {
|
||||
crate::error!("Double fault exception");
|
||||
loop {}
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
extern "C" fn general_protection_handler() {
|
||||
crate::error!("General protection fault");
|
||||
loop {}
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
extern "C" fn page_fault_handler() {
|
||||
let mut cr2: u64;
|
||||
unsafe {
|
||||
asm!("mov {}, cr2", out(reg) cr2);
|
||||
}
|
||||
crate::error!("Page fault at address 0x{:x}", cr2);
|
||||
loop {}
|
||||
}
|
||||
|
||||
/// System call interrupt handler
|
||||
#[no_mangle]
|
||||
pub extern "C" fn syscall_handler() {
|
||||
// TODO: Get syscall arguments from registers
|
||||
// TODO: Call syscall dispatcher
|
||||
// TODO: Return result in register
|
||||
// In x86_64, syscall arguments are passed in:
|
||||
// rax = syscall number
|
||||
// rdi = arg0, rsi = arg1, rdx = arg2, r10 = arg3, r8 = arg4, r9 = arg5
|
||||
|
||||
let mut syscall_num: u64;
|
||||
let mut arg0: u64;
|
||||
let mut arg1: u64;
|
||||
let mut arg2: u64;
|
||||
let mut arg3: u64;
|
||||
let mut arg4: u64;
|
||||
let mut arg5: u64;
|
||||
|
||||
// For now, just a placeholder
|
||||
unsafe {
|
||||
asm!(
|
||||
"mov {0}, rax",
|
||||
"mov {1}, rdi",
|
||||
"mov {2}, rsi",
|
||||
"mov {3}, rdx",
|
||||
"mov {4}, r10",
|
||||
"mov {5}, r8",
|
||||
"mov {6}, r9",
|
||||
out(reg) syscall_num,
|
||||
out(reg) arg0,
|
||||
out(reg) arg1,
|
||||
out(reg) arg2,
|
||||
out(reg) arg3,
|
||||
out(reg) arg4,
|
||||
out(reg) arg5,
|
||||
);
|
||||
}
|
||||
|
||||
// Call syscall dispatcher
|
||||
let result = crate::syscalls::arch::syscall_entry(
|
||||
syscall_num, arg0, arg1, arg2, arg3, arg4, arg5
|
||||
);
|
||||
|
||||
// Return result in register (rax)
|
||||
unsafe {
|
||||
asm!(
|
||||
"mov rax, {0}",
|
||||
in(reg) result,
|
||||
);
|
||||
|
||||
// Return from interrupt
|
||||
asm!("iretq", options(noreturn));
|
||||
}
|
||||
}
|
||||
|
||||
@ -23,6 +23,7 @@ pub mod boot;
|
||||
pub mod console;
|
||||
pub mod cpu;
|
||||
pub mod device;
|
||||
pub mod device_advanced;
|
||||
pub mod driver;
|
||||
pub mod error;
|
||||
pub mod fs;
|
||||
@ -30,6 +31,7 @@ pub mod init;
|
||||
pub mod interrupt;
|
||||
pub mod memory;
|
||||
pub mod module;
|
||||
pub mod network;
|
||||
pub mod panic;
|
||||
pub mod prelude;
|
||||
pub mod process;
|
||||
|
||||
@ -2,15 +2,169 @@
|
||||
|
||||
//! Kernel memory allocation (kmalloc)
|
||||
|
||||
use crate::error::Result;
|
||||
use crate::error::{Error, Result};
|
||||
use crate::memory::allocator::{alloc_pages, free_pages, GfpFlags, PageFrameNumber};
|
||||
use crate::sync::Spinlock;
|
||||
use alloc::collections::BTreeMap;
|
||||
use alloc::vec::Vec;
|
||||
use core::ptr::NonNull;
|
||||
|
||||
/// Kmalloc size classes (powers of 2)
|
||||
const KMALLOC_SIZES: &[usize] = &[8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096];
|
||||
const MAX_KMALLOC_SIZE: usize = 4096;
|
||||
|
||||
/// Slab allocator for small kernel allocations
|
||||
/// Uses indices instead of raw pointers for thread safety
|
||||
struct SlabAllocator {
|
||||
size_classes: BTreeMap<usize, Vec<usize>>, // Store offsets instead of pointers
|
||||
allocated_blocks: BTreeMap<usize, usize>, // Maps offsets to size classes
|
||||
base_addr: usize, // Base address for calculations
|
||||
}
|
||||
|
||||
impl SlabAllocator {
|
||||
const fn new() -> Self {
|
||||
Self {
|
||||
size_classes: BTreeMap::new(),
|
||||
allocated_blocks: BTreeMap::new(),
|
||||
base_addr: 0,
|
||||
}
|
||||
}
|
||||
|
||||
fn init(&mut self, base_addr: usize) {
|
||||
self.base_addr = base_addr;
|
||||
}
|
||||
|
||||
fn allocate(&mut self, size: usize) -> Result<*mut u8> {
|
||||
// Find appropriate size class
|
||||
let size_class = KMALLOC_SIZES.iter()
|
||||
.find(|&&s| s >= size)
|
||||
.copied()
|
||||
.unwrap_or(MAX_KMALLOC_SIZE);
|
||||
|
||||
if size_class > MAX_KMALLOC_SIZE {
|
||||
return Err(Error::OutOfMemory);
|
||||
}
|
||||
|
||||
// Try to get from free list
|
||||
if let Some(free_list) = self.size_classes.get_mut(&size_class) {
|
||||
if let Some(offset) = free_list.pop() {
|
||||
self.allocated_blocks.insert(offset, size_class);
|
||||
return Ok((self.base_addr + offset) as *mut u8);
|
||||
}
|
||||
}
|
||||
|
||||
// Allocate new page and split it
|
||||
self.allocate_new_slab(size_class)
|
||||
}
|
||||
|
||||
fn allocate_new_slab(&mut self, size_class: usize) -> Result<*mut u8> {
|
||||
// Allocate a page using buddy allocator
|
||||
let pfn = alloc_pages(0, GfpFlags::KERNEL)?;
|
||||
let page_addr = pfn.to_phys_addr().as_usize();
|
||||
let offset = page_addr - self.base_addr;
|
||||
|
||||
// Split page into blocks of size_class
|
||||
let blocks_per_page = 4096 / size_class;
|
||||
let free_list = self.size_classes.entry(size_class).or_insert_with(Vec::new);
|
||||
|
||||
for i in 1..blocks_per_page {
|
||||
let block_offset = offset + (i * size_class);
|
||||
free_list.push(block_offset);
|
||||
}
|
||||
|
||||
// Return the first block
|
||||
self.allocated_blocks.insert(offset, size_class);
|
||||
Ok(page_addr as *mut u8)
|
||||
}
|
||||
|
||||
fn deallocate(&mut self, ptr: *mut u8) -> Result<()> {
|
||||
let offset = (ptr as usize).saturating_sub(self.base_addr);
|
||||
if let Some(size_class) = self.allocated_blocks.remove(&offset) {
|
||||
let free_list = self.size_classes.entry(size_class).or_insert_with(Vec::new);
|
||||
free_list.push(offset);
|
||||
Ok(())
|
||||
} else {
|
||||
Err(Error::InvalidArgument)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static SLAB_ALLOCATOR: Spinlock<SlabAllocator> = Spinlock::new(SlabAllocator::new());
|
||||
|
||||
/// Allocate kernel memory
|
||||
pub fn kmalloc(size: usize) -> Result<*mut u8> {
|
||||
// TODO: implement proper kmalloc
|
||||
Ok(core::ptr::null_mut())
|
||||
if size == 0 {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
if size <= MAX_KMALLOC_SIZE {
|
||||
// Use slab allocator for small allocations
|
||||
let mut allocator = SLAB_ALLOCATOR.lock();
|
||||
allocator.allocate(size)
|
||||
} else {
|
||||
// Use buddy allocator for large allocations
|
||||
let pages_needed = (size + 4095) / 4096;
|
||||
let order = pages_needed.next_power_of_two().trailing_zeros() as usize;
|
||||
let pfn = alloc_pages(order, GfpFlags::KERNEL)?;
|
||||
Ok(pfn.to_phys_addr().as_usize() as *mut u8)
|
||||
}
|
||||
}
|
||||
|
||||
/// Free kernel memory
|
||||
pub fn kfree(ptr: *mut u8) {
|
||||
// TODO: implement proper kfree
|
||||
if ptr.is_null() {
|
||||
return;
|
||||
}
|
||||
|
||||
// Try slab allocator first
|
||||
if let Ok(()) = SLAB_ALLOCATOR.lock().deallocate(ptr) {
|
||||
return;
|
||||
}
|
||||
|
||||
// Try buddy allocator for large allocations
|
||||
// TODO: Keep track of large allocations to know how many pages to free
|
||||
// For now, assume single page
|
||||
if let Some(_page) = NonNull::new(ptr as *mut crate::memory::Page) {
|
||||
let pfn = PageFrameNumber::from_phys_addr(crate::types::PhysAddr::new(ptr as usize));
|
||||
free_pages(pfn, 0);
|
||||
}
|
||||
}
|
||||
|
||||
/// Allocate zeroed kernel memory
|
||||
pub fn kzalloc(size: usize) -> Result<*mut u8> {
|
||||
let ptr = kmalloc(size)?;
|
||||
unsafe {
|
||||
core::ptr::write_bytes(ptr, 0, size);
|
||||
}
|
||||
Ok(ptr)
|
||||
}
|
||||
|
||||
/// Reallocate kernel memory
|
||||
pub fn krealloc(ptr: *mut u8, old_size: usize, new_size: usize) -> Result<*mut u8> {
|
||||
if ptr.is_null() {
|
||||
return kmalloc(new_size);
|
||||
}
|
||||
|
||||
if new_size == 0 {
|
||||
kfree(ptr);
|
||||
return Ok(core::ptr::null_mut());
|
||||
}
|
||||
|
||||
let new_ptr = kmalloc(new_size)?;
|
||||
let copy_size = core::cmp::min(old_size, new_size);
|
||||
|
||||
unsafe {
|
||||
core::ptr::copy_nonoverlapping(ptr, new_ptr, copy_size);
|
||||
}
|
||||
|
||||
kfree(ptr);
|
||||
Ok(new_ptr)
|
||||
}
|
||||
|
||||
/// Initialize the slab allocator
|
||||
pub fn init() -> Result<()> {
|
||||
let mut allocator = SLAB_ALLOCATOR.lock();
|
||||
// Use a reasonable base address for offset calculations
|
||||
allocator.init(0x_4000_0000_0000);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
@ -4,6 +4,7 @@
|
||||
|
||||
pub mod allocator;
|
||||
pub mod page;
|
||||
pub mod page_table;
|
||||
pub mod vmalloc;
|
||||
pub mod kmalloc;
|
||||
|
||||
@ -12,6 +13,7 @@ pub use page::Page;
|
||||
pub use crate::types::{PhysAddr, VirtAddr, Pfn}; // Re-export from types
|
||||
|
||||
use crate::error::{Error, Result};
|
||||
use alloc::string::String;
|
||||
use linked_list_allocator::LockedHeap;
|
||||
|
||||
/// GFP (Get Free Pages) flags - compatible with Linux kernel
|
||||
@ -238,9 +240,18 @@ pub struct UserPtr<T> {
|
||||
}
|
||||
|
||||
impl<T> UserPtr<T> {
|
||||
/// Create a new UserPtr (unsafe as it's not validated)
|
||||
pub unsafe fn new(ptr: *mut T) -> Self {
|
||||
Self { ptr }
|
||||
/// Create a new UserPtr with validation
|
||||
pub fn new(ptr: *mut T) -> Result<Self> {
|
||||
if ptr.is_null() {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
// TODO: Add proper user space validation
|
||||
Ok(Self { ptr })
|
||||
}
|
||||
|
||||
/// Create a new UserPtr from const pointer
|
||||
pub fn from_const(ptr: *const T) -> Result<Self> {
|
||||
Self::new(ptr as *mut T)
|
||||
}
|
||||
|
||||
/// Get the raw pointer
|
||||
@ -248,6 +259,11 @@ impl<T> UserPtr<T> {
|
||||
self.ptr
|
||||
}
|
||||
|
||||
/// Cast to different type
|
||||
pub fn cast<U>(&self) -> UserPtr<U> {
|
||||
UserPtr { ptr: self.ptr as *mut U }
|
||||
}
|
||||
|
||||
/// Check if the pointer is null
|
||||
pub fn is_null(&self) -> bool {
|
||||
self.ptr.is_null()
|
||||
@ -335,6 +351,105 @@ impl UserSlicePtr {
|
||||
}
|
||||
}
|
||||
|
||||
/// Copy data to user space
|
||||
pub fn copy_to_user(user_ptr: UserPtr<u8>, data: &[u8]) -> Result<()> {
|
||||
// TODO: Implement proper user space access validation
|
||||
// This should check if the user pointer is valid and accessible
|
||||
|
||||
if user_ptr.ptr.is_null() {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
// In a real kernel, this would use proper copy_to_user with page fault handling
|
||||
// For now, we'll use unsafe direct copy (NOT safe for real use)
|
||||
unsafe {
|
||||
core::ptr::copy_nonoverlapping(data.as_ptr(), user_ptr.ptr, data.len());
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Copy data from user space
|
||||
pub fn copy_from_user(data: &mut [u8], user_ptr: UserPtr<u8>) -> Result<()> {
|
||||
// TODO: Implement proper user space access validation
|
||||
// This should check if the user pointer is valid and accessible
|
||||
|
||||
if user_ptr.ptr.is_null() {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
// In a real kernel, this would use proper copy_from_user with page fault handling
|
||||
// For now, we'll use unsafe direct copy (NOT safe for real use)
|
||||
unsafe {
|
||||
core::ptr::copy_nonoverlapping(user_ptr.ptr, data.as_mut_ptr(), data.len());
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Copy a string from user space
|
||||
pub fn copy_string_from_user(user_ptr: UserPtr<u8>, max_len: usize) -> Result<String> {
|
||||
// TODO: Implement proper user space access validation
|
||||
|
||||
if user_ptr.ptr.is_null() {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
let mut buffer = alloc::vec![0u8; max_len];
|
||||
let mut len = 0;
|
||||
|
||||
// Copy byte by byte until null terminator or max length
|
||||
unsafe {
|
||||
for i in 0..max_len {
|
||||
let byte = *user_ptr.ptr.add(i);
|
||||
if byte == 0 {
|
||||
break;
|
||||
}
|
||||
buffer[i] = byte;
|
||||
len += 1;
|
||||
}
|
||||
}
|
||||
|
||||
buffer.truncate(len);
|
||||
String::from_utf8(buffer).map_err(|_| Error::InvalidArgument)
|
||||
}
|
||||
|
||||
/// Global heap management
|
||||
static HEAP_START: core::sync::atomic::AtomicUsize = core::sync::atomic::AtomicUsize::new(0x40000000); // Start at 1GB
|
||||
static HEAP_END: core::sync::atomic::AtomicUsize = core::sync::atomic::AtomicUsize::new(0x40000000);
|
||||
|
||||
/// Allocate virtual memory region
|
||||
pub fn allocate_virtual_memory(size: u64, prot: u32, flags: u32) -> Result<VmaArea> {
|
||||
// Simple allocator - in reality this would be much more sophisticated
|
||||
let start = HEAP_END.fetch_add(size as usize, core::sync::atomic::Ordering::SeqCst);
|
||||
let end = start + size as usize;
|
||||
|
||||
let vma = VmaArea::new(VirtAddr::new(start), VirtAddr::new(end), prot);
|
||||
|
||||
// TODO: Set up page tables for the VMA
|
||||
// TODO: Handle different protection flags
|
||||
|
||||
Ok(vma)
|
||||
}
|
||||
|
||||
/// Free virtual memory region
|
||||
pub fn free_virtual_memory(addr: VirtAddr, size: u64) -> Result<()> {
|
||||
// TODO: Find and remove VMA
|
||||
// TODO: Free page tables
|
||||
// TODO: Free physical pages
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Get current heap end
|
||||
pub fn get_heap_end() -> VirtAddr {
|
||||
VirtAddr::new(HEAP_END.load(core::sync::atomic::Ordering::SeqCst))
|
||||
}
|
||||
|
||||
/// Set heap end
|
||||
pub fn set_heap_end(addr: VirtAddr) -> Result<()> {
|
||||
HEAP_END.store(addr.as_usize(), core::sync::atomic::Ordering::SeqCst);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Virtual memory area - similar to Linux vm_area_struct
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct VmaArea {
|
||||
|
||||
262
kernel/src/memory/page_table.rs
Normal file
262
kernel/src/memory/page_table.rs
Normal file
@ -0,0 +1,262 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
//! Page table management for x86_64
|
||||
|
||||
use crate::error::{Error, Result};
|
||||
use crate::types::{VirtAddr, PhysAddr, PAGE_SIZE};
|
||||
use crate::memory::allocator::{alloc_pages, free_pages, GfpFlags, PageFrameNumber};
|
||||
use core::arch::asm;
|
||||
|
||||
/// Page table entry flags
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
pub struct PageTableFlags(pub u64);
|
||||
|
||||
impl PageTableFlags {
|
||||
pub const PRESENT: Self = Self(1 << 0);
|
||||
pub const WRITABLE: Self = Self(1 << 1);
|
||||
pub const USER_ACCESSIBLE: Self = Self(1 << 2);
|
||||
pub const WRITE_THROUGH: Self = Self(1 << 3);
|
||||
pub const NO_CACHE: Self = Self(1 << 4);
|
||||
pub const ACCESSED: Self = Self(1 << 5);
|
||||
pub const DIRTY: Self = Self(1 << 6);
|
||||
pub const HUGE_PAGE: Self = Self(1 << 7);
|
||||
pub const GLOBAL: Self = Self(1 << 8);
|
||||
pub const NO_EXECUTE: Self = Self(1 << 63);
|
||||
|
||||
pub fn empty() -> Self {
|
||||
Self(0)
|
||||
}
|
||||
|
||||
pub fn kernel_page() -> Self {
|
||||
Self::PRESENT | Self::WRITABLE
|
||||
}
|
||||
|
||||
pub fn user_page() -> Self {
|
||||
Self::PRESENT | Self::WRITABLE | Self::USER_ACCESSIBLE
|
||||
}
|
||||
|
||||
pub fn contains(self, flag: Self) -> bool {
|
||||
self.0 & flag.0 != 0
|
||||
}
|
||||
}
|
||||
|
||||
impl core::ops::BitOr for PageTableFlags {
|
||||
type Output = Self;
|
||||
|
||||
fn bitor(self, rhs: Self) -> Self::Output {
|
||||
Self(self.0 | rhs.0)
|
||||
}
|
||||
}
|
||||
|
||||
impl core::ops::BitOrAssign for PageTableFlags {
|
||||
fn bitor_assign(&mut self, rhs: Self) {
|
||||
self.0 |= rhs.0;
|
||||
}
|
||||
}
|
||||
|
||||
/// Page table entry
|
||||
#[repr(transparent)]
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
pub struct PageTableEntry(pub u64);
|
||||
|
||||
impl PageTableEntry {
|
||||
pub fn new() -> Self {
|
||||
Self(0)
|
||||
}
|
||||
|
||||
pub fn is_present(self) -> bool {
|
||||
self.0 & 1 != 0
|
||||
}
|
||||
|
||||
pub fn set_frame(self, frame: PageFrameNumber, flags: PageTableFlags) -> Self {
|
||||
let addr = frame.to_phys_addr().as_usize() as u64;
|
||||
Self((addr & !0xfff) | flags.0)
|
||||
}
|
||||
|
||||
pub fn frame(self) -> Option<PageFrameNumber> {
|
||||
if self.is_present() {
|
||||
Some(PageFrameNumber::from_phys_addr(PhysAddr::new((self.0 & !0xfff) as usize)))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
pub fn flags(self) -> PageTableFlags {
|
||||
PageTableFlags(self.0 & 0xfff)
|
||||
}
|
||||
}
|
||||
|
||||
/// Page table with 512 entries (x86_64)
|
||||
#[repr(align(4096))]
|
||||
pub struct PageTable {
|
||||
entries: [PageTableEntry; 512],
|
||||
}
|
||||
|
||||
impl PageTable {
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
entries: [PageTableEntry::new(); 512],
|
||||
}
|
||||
}
|
||||
|
||||
pub fn zero(&mut self) {
|
||||
for entry in &mut self.entries {
|
||||
*entry = PageTableEntry::new();
|
||||
}
|
||||
}
|
||||
|
||||
pub fn entry(&mut self, index: usize) -> &mut PageTableEntry {
|
||||
&mut self.entries[index]
|
||||
}
|
||||
|
||||
pub fn entry_ref(&self, index: usize) -> &PageTableEntry {
|
||||
&self.entries[index]
|
||||
}
|
||||
}
|
||||
|
||||
/// Page table manager
|
||||
pub struct PageTableManager {
|
||||
root_table: PhysAddr,
|
||||
}
|
||||
|
||||
impl PageTableManager {
|
||||
pub fn new() -> Result<Self> {
|
||||
// Allocate a page for the root page table (PML4)
|
||||
let pfn = alloc_pages(0, GfpFlags::KERNEL)?;
|
||||
let root_table = pfn.to_phys_addr();
|
||||
|
||||
// Zero the root table
|
||||
unsafe {
|
||||
let table = root_table.as_usize() as *mut PageTable;
|
||||
(*table).zero();
|
||||
}
|
||||
|
||||
Ok(Self { root_table })
|
||||
}
|
||||
|
||||
pub fn root_table_addr(&self) -> PhysAddr {
|
||||
self.root_table
|
||||
}
|
||||
|
||||
/// Map a virtual page to a physical page
|
||||
pub fn map_page(&mut self, virt_addr: VirtAddr, phys_addr: PhysAddr, flags: PageTableFlags) -> Result<()> {
|
||||
let virt_page = virt_addr.as_usize() / PAGE_SIZE;
|
||||
let pfn = PageFrameNumber::from_phys_addr(phys_addr);
|
||||
|
||||
// Extract page table indices from virtual address
|
||||
let pml4_index = (virt_page >> 27) & 0x1ff;
|
||||
let pdp_index = (virt_page >> 18) & 0x1ff;
|
||||
let pd_index = (virt_page >> 9) & 0x1ff;
|
||||
let pt_index = virt_page & 0x1ff;
|
||||
|
||||
// Walk and create page tables as needed
|
||||
let pml4 = unsafe { &mut *(self.root_table.as_usize() as *mut PageTable) };
|
||||
|
||||
// Get or create PDP
|
||||
let pdp_addr = if pml4.entry_ref(pml4_index).is_present() {
|
||||
pml4.entry_ref(pml4_index).frame().unwrap().to_phys_addr()
|
||||
} else {
|
||||
let pdp_pfn = alloc_pages(0, GfpFlags::KERNEL)?;
|
||||
let pdp_addr = pdp_pfn.to_phys_addr();
|
||||
unsafe {
|
||||
let pdp_table = pdp_addr.as_usize() as *mut PageTable;
|
||||
(*pdp_table).zero();
|
||||
}
|
||||
*pml4.entry(pml4_index) = PageTableEntry::new().set_frame(pdp_pfn, PageTableFlags::kernel_page());
|
||||
pdp_addr
|
||||
};
|
||||
|
||||
// Get or create PD
|
||||
let pdp = unsafe { &mut *(pdp_addr.as_usize() as *mut PageTable) };
|
||||
let pd_addr = if pdp.entry_ref(pdp_index).is_present() {
|
||||
pdp.entry_ref(pdp_index).frame().unwrap().to_phys_addr()
|
||||
} else {
|
||||
let pd_pfn = alloc_pages(0, GfpFlags::KERNEL)?;
|
||||
let pd_addr = pd_pfn.to_phys_addr();
|
||||
unsafe {
|
||||
let pd_table = pd_addr.as_usize() as *mut PageTable;
|
||||
(*pd_table).zero();
|
||||
}
|
||||
*pdp.entry(pdp_index) = PageTableEntry::new().set_frame(pd_pfn, PageTableFlags::kernel_page());
|
||||
pd_addr
|
||||
};
|
||||
|
||||
// Get or create PT
|
||||
let pd = unsafe { &mut *(pd_addr.as_usize() as *mut PageTable) };
|
||||
let pt_addr = if pd.entry_ref(pd_index).is_present() {
|
||||
pd.entry_ref(pd_index).frame().unwrap().to_phys_addr()
|
||||
} else {
|
||||
let pt_pfn = alloc_pages(0, GfpFlags::KERNEL)?;
|
||||
let pt_addr = pt_pfn.to_phys_addr();
|
||||
unsafe {
|
||||
let pt_table = pt_addr.as_usize() as *mut PageTable;
|
||||
(*pt_table).zero();
|
||||
}
|
||||
*pd.entry(pd_index) = PageTableEntry::new().set_frame(pt_pfn, PageTableFlags::kernel_page());
|
||||
pt_addr
|
||||
};
|
||||
|
||||
// Set the final page mapping
|
||||
let pt = unsafe { &mut *(pt_addr.as_usize() as *mut PageTable) };
|
||||
*pt.entry(pt_index) = PageTableEntry::new().set_frame(pfn, flags);
|
||||
|
||||
// Flush TLB for this page
|
||||
unsafe {
|
||||
asm!("invlpg [{}]", in(reg) virt_addr.as_usize(), options(nostack, preserves_flags));
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Unmap a virtual page
|
||||
pub fn unmap_page(&mut self, virt_addr: VirtAddr) -> Result<()> {
|
||||
let virt_page = virt_addr.as_usize() / PAGE_SIZE;
|
||||
|
||||
// Extract page table indices
|
||||
let pml4_index = (virt_page >> 27) & 0x1ff;
|
||||
let pdp_index = (virt_page >> 18) & 0x1ff;
|
||||
let pd_index = (virt_page >> 9) & 0x1ff;
|
||||
let pt_index = virt_page & 0x1ff;
|
||||
|
||||
// Walk page tables
|
||||
let pml4 = unsafe { &mut *(self.root_table.as_usize() as *mut PageTable) };
|
||||
|
||||
if !pml4.entry_ref(pml4_index).is_present() {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
let pdp_addr = pml4.entry_ref(pml4_index).frame().unwrap().to_phys_addr();
|
||||
let pdp = unsafe { &mut *(pdp_addr.as_usize() as *mut PageTable) };
|
||||
|
||||
if !pdp.entry_ref(pdp_index).is_present() {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
let pd_addr = pdp.entry_ref(pdp_index).frame().unwrap().to_phys_addr();
|
||||
let pd = unsafe { &mut *(pd_addr.as_usize() as *mut PageTable) };
|
||||
|
||||
if !pd.entry_ref(pd_index).is_present() {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
let pt_addr = pd.entry_ref(pd_index).frame().unwrap().to_phys_addr();
|
||||
let pt = unsafe { &mut *(pt_addr.as_usize() as *mut PageTable) };
|
||||
|
||||
// Clear the page table entry
|
||||
*pt.entry(pt_index) = PageTableEntry::new();
|
||||
|
||||
// Flush TLB for this page
|
||||
unsafe {
|
||||
asm!("invlpg [{}]", in(reg) virt_addr.as_usize(), options(nostack, preserves_flags));
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Switch to this page table
|
||||
pub fn switch_to(&self) {
|
||||
unsafe {
|
||||
asm!("mov cr3, {}", in(reg) self.root_table.as_usize(), options(nostack, preserves_flags));
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -2,16 +2,181 @@
|
||||
|
||||
//! Virtual memory allocation
|
||||
|
||||
use crate::error::Result;
|
||||
use crate::types::VirtAddr;
|
||||
use crate::error::{Error, Result};
|
||||
use crate::types::{VirtAddr, PhysAddr};
|
||||
use crate::memory::allocator::{alloc_pages, free_pages, GfpFlags, PageFrameNumber};
|
||||
use crate::memory::page_table::{PageTableManager, PageTableFlags};
|
||||
use crate::sync::Spinlock;
|
||||
use alloc::collections::BTreeMap;
|
||||
use core::ptr::NonNull;
|
||||
|
||||
/// Virtual memory area descriptor
|
||||
#[derive(Debug, Clone)]
|
||||
struct VmallocArea {
|
||||
start: VirtAddr,
|
||||
end: VirtAddr,
|
||||
size: usize,
|
||||
pages: alloc::vec::Vec<PhysAddr>,
|
||||
}
|
||||
|
||||
/// Vmalloc allocator
|
||||
struct VmallocAllocator {
|
||||
areas: BTreeMap<usize, VmallocArea>,
|
||||
next_addr: usize,
|
||||
page_table: Option<PageTableManager>,
|
||||
}
|
||||
|
||||
impl VmallocAllocator {
|
||||
const fn new() -> Self {
|
||||
Self {
|
||||
areas: BTreeMap::new(),
|
||||
next_addr: 0xFFFF_8000_0000_0000, // Kernel vmalloc area start
|
||||
page_table: None,
|
||||
}
|
||||
}
|
||||
|
||||
fn init(&mut self) -> Result<()> {
|
||||
self.page_table = Some(PageTableManager::new()?);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn allocate(&mut self, size: usize) -> Result<VirtAddr> {
|
||||
if size == 0 {
|
||||
return Err(Error::InvalidArgument);
|
||||
}
|
||||
|
||||
// Align size to page boundary
|
||||
let aligned_size = (size + 4095) & !4095;
|
||||
let pages_needed = aligned_size / 4096;
|
||||
|
||||
// Find virtual address space
|
||||
let start_addr = self.find_free_area(aligned_size)?;
|
||||
let end_addr = start_addr + aligned_size;
|
||||
|
||||
// Allocate physical pages
|
||||
let mut pages = alloc::vec::Vec::new();
|
||||
for _ in 0..pages_needed {
|
||||
let pfn = alloc_pages(0, GfpFlags::KERNEL)?;
|
||||
pages.push(pfn.to_phys_addr());
|
||||
}
|
||||
|
||||
// Map virtual to physical pages
|
||||
if let Some(ref mut page_table) = self.page_table {
|
||||
for (i, &phys_addr) in pages.iter().enumerate() {
|
||||
let virt_addr = VirtAddr::new(start_addr + i * 4096);
|
||||
page_table.map_page(virt_addr, phys_addr, PageTableFlags::kernel_page())?;
|
||||
}
|
||||
}
|
||||
|
||||
let area = VmallocArea {
|
||||
start: VirtAddr::new(start_addr),
|
||||
end: VirtAddr::new(end_addr),
|
||||
size: aligned_size,
|
||||
pages,
|
||||
};
|
||||
|
||||
self.areas.insert(start_addr, area);
|
||||
Ok(VirtAddr::new(start_addr))
|
||||
}
|
||||
|
||||
fn deallocate(&mut self, addr: VirtAddr) -> Result<()> {
|
||||
let addr_usize = addr.as_usize();
|
||||
|
||||
if let Some(area) = self.areas.remove(&addr_usize) {
|
||||
// Unmap pages from page tables
|
||||
if let Some(ref mut page_table) = self.page_table {
|
||||
for i in 0..(area.size / 4096) {
|
||||
let virt_addr = VirtAddr::new(area.start.as_usize() + i * 4096);
|
||||
let _ = page_table.unmap_page(virt_addr);
|
||||
}
|
||||
}
|
||||
|
||||
// Free physical pages
|
||||
for phys_addr in area.pages {
|
||||
if let Some(_page_ptr) = NonNull::new(phys_addr.as_usize() as *mut crate::memory::Page) {
|
||||
let pfn = PageFrameNumber::from_phys_addr(phys_addr);
|
||||
free_pages(pfn, 0);
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
} else {
|
||||
Err(Error::InvalidArgument)
|
||||
}
|
||||
}
|
||||
|
||||
fn find_free_area(&mut self, size: usize) -> Result<usize> {
|
||||
// Simple linear search for free area
|
||||
// In a real implementation, this would be more sophisticated
|
||||
let mut addr = self.next_addr;
|
||||
|
||||
// Check if area is free
|
||||
for (start, area) in &self.areas {
|
||||
if addr >= *start && addr < area.end.as_usize() {
|
||||
addr = area.end.as_usize();
|
||||
}
|
||||
}
|
||||
|
||||
self.next_addr = addr + size;
|
||||
Ok(addr)
|
||||
}
|
||||
}
|
||||
|
||||
static VMALLOC_ALLOCATOR: Spinlock<VmallocAllocator> = Spinlock::new(VmallocAllocator::new());
|
||||
|
||||
/// Allocate virtual memory
|
||||
pub fn vmalloc(size: usize) -> Result<VirtAddr> {
|
||||
// TODO: implement proper vmalloc
|
||||
Ok(VirtAddr::new(0))
|
||||
let mut allocator = VMALLOC_ALLOCATOR.lock();
|
||||
allocator.allocate(size)
|
||||
}
|
||||
|
||||
/// Free virtual memory
|
||||
pub fn vfree(addr: VirtAddr) {
|
||||
// TODO: implement proper vfree
|
||||
let mut allocator = VMALLOC_ALLOCATOR.lock();
|
||||
let _ = allocator.deallocate(addr);
|
||||
}
|
||||
|
||||
/// Allocate zeroed virtual memory
|
||||
pub fn vzalloc(size: usize) -> Result<VirtAddr> {
|
||||
let addr = vmalloc(size)?;
|
||||
|
||||
// Zero the memory
|
||||
unsafe {
|
||||
core::ptr::write_bytes(addr.as_usize() as *mut u8, 0, size);
|
||||
}
|
||||
|
||||
Ok(addr)
|
||||
}
|
||||
|
||||
/// Map physical memory into virtual space
|
||||
pub fn vmap(pages: &[PhysAddr], count: usize) -> Result<VirtAddr> {
|
||||
let size = count * 4096;
|
||||
let mut allocator = VMALLOC_ALLOCATOR.lock();
|
||||
|
||||
// Find virtual address space
|
||||
let start_addr = allocator.find_free_area(size)?;
|
||||
|
||||
let area = VmallocArea {
|
||||
start: VirtAddr::new(start_addr),
|
||||
end: VirtAddr::new(start_addr + size),
|
||||
size,
|
||||
pages: pages.to_vec(),
|
||||
};
|
||||
|
||||
allocator.areas.insert(start_addr, area);
|
||||
|
||||
// TODO: Set up page table mappings
|
||||
|
||||
Ok(VirtAddr::new(start_addr))
|
||||
}
|
||||
|
||||
/// Unmap virtual memory
|
||||
pub fn vunmap(addr: VirtAddr) {
|
||||
vfree(addr);
|
||||
}
|
||||
|
||||
/// Initialize vmalloc allocator
|
||||
pub fn init() -> Result<()> {
|
||||
let mut allocator = VMALLOC_ALLOCATOR.lock();
|
||||
allocator.init()
|
||||
}
|
||||
|
||||
447
kernel/src/network.rs
Normal file
447
kernel/src/network.rs
Normal file
@ -0,0 +1,447 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
//! Network stack implementation
|
||||
|
||||
use crate::error::{Error, Result};
|
||||
use crate::sync::Spinlock;
|
||||
use alloc::{vec::Vec, collections::BTreeMap, string::String, boxed::Box};
|
||||
use core::fmt;
|
||||
|
||||
/// Network protocol types
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
|
||||
pub enum ProtocolType {
|
||||
Ethernet = 0x0001,
|
||||
IPv4 = 0x0800,
|
||||
IPv6 = 0x86DD,
|
||||
ARP = 0x0806,
|
||||
TCP = 6,
|
||||
UDP = 17,
|
||||
ICMP = 2, // Different value to avoid conflict with Ethernet
|
||||
ICMPv6 = 58,
|
||||
}
|
||||
|
||||
/// MAC address (6 bytes)
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
|
||||
pub struct MacAddress([u8; 6]);
|
||||
|
||||
impl MacAddress {
|
||||
pub const fn new(bytes: [u8; 6]) -> Self {
|
||||
Self(bytes)
|
||||
}
|
||||
|
||||
pub const fn broadcast() -> Self {
|
||||
Self([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])
|
||||
}
|
||||
|
||||
pub const fn zero() -> Self {
|
||||
Self([0, 0, 0, 0, 0, 0])
|
||||
}
|
||||
|
||||
pub fn bytes(&self) -> &[u8; 6] {
|
||||
&self.0
|
||||
}
|
||||
|
||||
pub fn is_broadcast(&self) -> bool {
|
||||
*self == Self::broadcast()
|
||||
}
|
||||
|
||||
pub fn is_multicast(&self) -> bool {
|
||||
(self.0[0] & 0x01) != 0
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for MacAddress {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
write!(f, "{:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}",
|
||||
self.0[0], self.0[1], self.0[2], self.0[3], self.0[4], self.0[5])
|
||||
}
|
||||
}
|
||||
|
||||
/// IPv4 address
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
|
||||
pub struct Ipv4Address([u8; 4]);
|
||||
|
||||
impl Ipv4Address {
|
||||
pub const fn new(a: u8, b: u8, c: u8, d: u8) -> Self {
|
||||
Self([a, b, c, d])
|
||||
}
|
||||
|
||||
pub const fn from_bytes(bytes: [u8; 4]) -> Self {
|
||||
Self(bytes)
|
||||
}
|
||||
|
||||
pub const fn localhost() -> Self {
|
||||
Self([127, 0, 0, 1])
|
||||
}
|
||||
|
||||
pub const fn broadcast() -> Self {
|
||||
Self([255, 255, 255, 255])
|
||||
}
|
||||
|
||||
pub const fn any() -> Self {
|
||||
Self([0, 0, 0, 0])
|
||||
}
|
||||
|
||||
pub fn bytes(&self) -> &[u8; 4] {
|
||||
&self.0
|
||||
}
|
||||
|
||||
pub fn to_u32(&self) -> u32 {
|
||||
u32::from_be_bytes(self.0)
|
||||
}
|
||||
|
||||
pub fn from_u32(addr: u32) -> Self {
|
||||
Self(addr.to_be_bytes())
|
||||
}
|
||||
|
||||
pub fn is_private(&self) -> bool {
|
||||
matches!(self.0,
|
||||
[10, ..] |
|
||||
[172, 16..=31, ..] |
|
||||
[192, 168, ..]
|
||||
)
|
||||
}
|
||||
|
||||
pub fn is_multicast(&self) -> bool {
|
||||
(self.0[0] & 0xF0) == 0xE0
|
||||
}
|
||||
|
||||
pub fn is_broadcast(&self) -> bool {
|
||||
*self == Self::broadcast()
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for Ipv4Address {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
write!(f, "{}.{}.{}.{}", self.0[0], self.0[1], self.0[2], self.0[3])
|
||||
}
|
||||
}
|
||||
|
||||
/// Network packet buffer
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct NetworkBuffer {
|
||||
data: Vec<u8>,
|
||||
len: usize,
|
||||
protocol: ProtocolType,
|
||||
source_mac: Option<MacAddress>,
|
||||
dest_mac: Option<MacAddress>,
|
||||
source_ip: Option<Ipv4Address>,
|
||||
dest_ip: Option<Ipv4Address>,
|
||||
source_port: Option<u16>,
|
||||
dest_port: Option<u16>,
|
||||
}
|
||||
|
||||
impl NetworkBuffer {
|
||||
pub fn new(capacity: usize) -> Self {
|
||||
Self {
|
||||
data: Vec::with_capacity(capacity),
|
||||
len: 0,
|
||||
protocol: ProtocolType::Ethernet,
|
||||
source_mac: None,
|
||||
dest_mac: None,
|
||||
source_ip: None,
|
||||
dest_ip: None,
|
||||
source_port: None,
|
||||
dest_port: None,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn from_data(data: Vec<u8>) -> Self {
|
||||
let len = data.len();
|
||||
Self {
|
||||
data,
|
||||
len,
|
||||
protocol: ProtocolType::Ethernet,
|
||||
source_mac: None,
|
||||
dest_mac: None,
|
||||
source_ip: None,
|
||||
dest_ip: None,
|
||||
source_port: None,
|
||||
dest_port: None,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn data(&self) -> &[u8] {
|
||||
&self.data[..self.len]
|
||||
}
|
||||
|
||||
pub fn data_mut(&mut self) -> &mut [u8] {
|
||||
&mut self.data[..self.len]
|
||||
}
|
||||
|
||||
pub fn len(&self) -> usize {
|
||||
self.len
|
||||
}
|
||||
|
||||
pub fn push(&mut self, byte: u8) -> Result<()> {
|
||||
if self.len >= self.data.capacity() {
|
||||
return Err(Error::OutOfMemory);
|
||||
}
|
||||
if self.len >= self.data.len() {
|
||||
self.data.push(byte);
|
||||
} else {
|
||||
self.data[self.len] = byte;
|
||||
}
|
||||
self.len += 1;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn extend_from_slice(&mut self, data: &[u8]) -> Result<()> {
|
||||
if self.len + data.len() > self.data.capacity() {
|
||||
return Err(Error::OutOfMemory);
|
||||
}
|
||||
for &byte in data {
|
||||
self.push(byte)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn set_protocol(&mut self, protocol: ProtocolType) {
|
||||
self.protocol = protocol;
|
||||
}
|
||||
|
||||
pub fn set_mac_addresses(&mut self, source: MacAddress, dest: MacAddress) {
|
||||
self.source_mac = Some(source);
|
||||
self.dest_mac = Some(dest);
|
||||
}
|
||||
|
||||
pub fn set_ip_addresses(&mut self, source: Ipv4Address, dest: Ipv4Address) {
|
||||
self.source_ip = Some(source);
|
||||
self.dest_ip = Some(dest);
|
||||
}
|
||||
|
||||
pub fn set_ports(&mut self, source: u16, dest: u16) {
|
||||
self.source_port = Some(source);
|
||||
self.dest_port = Some(dest);
|
||||
}
|
||||
}
|
||||
|
||||
/// Network interface
|
||||
pub trait NetworkInterface: Send + Sync {
|
||||
fn name(&self) -> &str;
|
||||
fn mac_address(&self) -> MacAddress;
|
||||
fn mtu(&self) -> u16;
|
||||
fn is_up(&self) -> bool;
|
||||
|
||||
fn send_packet(&mut self, buffer: &NetworkBuffer) -> Result<()>;
|
||||
fn receive_packet(&mut self) -> Result<Option<NetworkBuffer>>;
|
||||
|
||||
fn set_up(&mut self, up: bool) -> Result<()>;
|
||||
fn set_mac_address(&mut self, mac: MacAddress) -> Result<()>;
|
||||
}
|
||||
|
||||
/// Network interface statistics
|
||||
#[derive(Debug, Default, Clone)]
|
||||
pub struct InterfaceStats {
|
||||
pub bytes_sent: u64,
|
||||
pub bytes_received: u64,
|
||||
pub packets_sent: u64,
|
||||
pub packets_received: u64,
|
||||
pub errors: u64,
|
||||
pub dropped: u64,
|
||||
}
|
||||
|
||||
/// Network stack
|
||||
pub struct NetworkStack {
|
||||
interfaces: BTreeMap<String, Box<dyn NetworkInterface>>,
|
||||
interface_stats: BTreeMap<String, InterfaceStats>,
|
||||
routing_table: Vec<RouteEntry>,
|
||||
arp_table: BTreeMap<Ipv4Address, MacAddress>,
|
||||
}
|
||||
|
||||
/// Routing table entry
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct RouteEntry {
|
||||
pub destination: Ipv4Address,
|
||||
pub netmask: Ipv4Address,
|
||||
pub gateway: Option<Ipv4Address>,
|
||||
pub interface: String,
|
||||
pub metric: u32,
|
||||
}
|
||||
|
||||
impl NetworkStack {
|
||||
const fn new() -> Self {
|
||||
Self {
|
||||
interfaces: BTreeMap::new(),
|
||||
interface_stats: BTreeMap::new(),
|
||||
routing_table: Vec::new(),
|
||||
arp_table: BTreeMap::new(),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn add_interface(&mut self, name: String, interface: Box<dyn NetworkInterface>) {
|
||||
self.interface_stats.insert(name.clone(), InterfaceStats::default());
|
||||
self.interfaces.insert(name, interface);
|
||||
}
|
||||
|
||||
pub fn remove_interface(&mut self, name: &str) -> Option<Box<dyn NetworkInterface>> {
|
||||
self.interface_stats.remove(name);
|
||||
self.interfaces.remove(name)
|
||||
}
|
||||
|
||||
pub fn get_interface(&self, name: &str) -> Option<&dyn NetworkInterface> {
|
||||
self.interfaces.get(name).map(|i| i.as_ref())
|
||||
}
|
||||
|
||||
pub fn get_interface_mut<'a>(&'a mut self, name: &str) -> Option<&'a mut (dyn NetworkInterface + 'a)> {
|
||||
if let Some(interface) = self.interfaces.get_mut(name) {
|
||||
Some(interface.as_mut())
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
pub fn list_interfaces(&self) -> Vec<String> {
|
||||
self.interfaces.keys().cloned().collect()
|
||||
}
|
||||
|
||||
pub fn add_route(&mut self, route: RouteEntry) {
|
||||
self.routing_table.push(route);
|
||||
// Sort by metric (lower is better)
|
||||
self.routing_table.sort_by_key(|r| r.metric);
|
||||
}
|
||||
|
||||
pub fn find_route(&self, dest: Ipv4Address) -> Option<&RouteEntry> {
|
||||
for route in &self.routing_table {
|
||||
let dest_u32 = dest.to_u32();
|
||||
let route_dest = route.destination.to_u32();
|
||||
let netmask = route.netmask.to_u32();
|
||||
|
||||
if (dest_u32 & netmask) == (route_dest & netmask) {
|
||||
return Some(route);
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
pub fn add_arp_entry(&mut self, ip: Ipv4Address, mac: MacAddress) {
|
||||
self.arp_table.insert(ip, mac);
|
||||
}
|
||||
|
||||
pub fn lookup_arp(&self, ip: Ipv4Address) -> Option<MacAddress> {
|
||||
self.arp_table.get(&ip).copied()
|
||||
}
|
||||
|
||||
pub fn send_packet(&mut self, dest: Ipv4Address, data: &[u8], protocol: ProtocolType) -> Result<()> {
|
||||
// Find route (borrow self immutably)
|
||||
let route = {
|
||||
let route = self.find_route(dest).ok_or(Error::NetworkUnreachable)?;
|
||||
route.clone() // Clone to avoid borrowing issues
|
||||
};
|
||||
|
||||
// Look up MAC address first (borrow self immutably)
|
||||
let dest_mac = if let Some(gateway) = route.gateway {
|
||||
self.lookup_arp(gateway).ok_or(Error::NetworkUnreachable)?
|
||||
} else {
|
||||
self.lookup_arp(dest).ok_or(Error::NetworkUnreachable)?
|
||||
};
|
||||
|
||||
// Get interface MAC address
|
||||
let interface_mac = {
|
||||
let interface = self.get_interface(&route.interface)
|
||||
.ok_or(Error::DeviceNotFound)?;
|
||||
interface.mac_address()
|
||||
};
|
||||
|
||||
// Build packet
|
||||
let mut buffer = NetworkBuffer::new(1500);
|
||||
buffer.set_protocol(protocol);
|
||||
buffer.set_mac_addresses(interface_mac, dest_mac);
|
||||
buffer.extend_from_slice(data)?;
|
||||
|
||||
// Send packet (borrow self mutably)
|
||||
{
|
||||
let interface = self.get_interface_mut(&route.interface)
|
||||
.ok_or(Error::DeviceNotFound)?;
|
||||
interface.send_packet(&buffer)?;
|
||||
}
|
||||
|
||||
// Update statistics
|
||||
if let Some(stats) = self.interface_stats.get_mut(&route.interface) {
|
||||
stats.packets_sent += 1;
|
||||
stats.bytes_sent += buffer.len() as u64;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn receive_packets(&mut self) -> Result<Vec<NetworkBuffer>> {
|
||||
let mut packets = Vec::new();
|
||||
|
||||
for (name, interface) in &mut self.interfaces {
|
||||
while let Some(packet) = interface.receive_packet()? {
|
||||
if let Some(stats) = self.interface_stats.get_mut(name) {
|
||||
stats.packets_received += 1;
|
||||
stats.bytes_received += packet.len() as u64;
|
||||
}
|
||||
packets.push(packet);
|
||||
}
|
||||
}
|
||||
|
||||
Ok(packets)
|
||||
}
|
||||
|
||||
pub fn get_interface_stats(&self, name: &str) -> Option<&InterfaceStats> {
|
||||
self.interface_stats.get(name)
|
||||
}
|
||||
}
|
||||
|
||||
/// Global network stack
|
||||
pub static NETWORK_STACK: Spinlock<Option<NetworkStack>> = Spinlock::new(None);
|
||||
|
||||
/// Initialize network stack
|
||||
pub fn init() -> Result<()> {
|
||||
let mut stack = NETWORK_STACK.lock();
|
||||
*stack = Some(NetworkStack::new());
|
||||
crate::info!("Network stack initialized");
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Add a network interface
|
||||
pub fn add_network_interface(name: String, interface: Box<dyn NetworkInterface>) -> Result<()> {
|
||||
let mut stack_opt = NETWORK_STACK.lock();
|
||||
if let Some(ref mut stack) = *stack_opt {
|
||||
stack.add_interface(name, interface);
|
||||
Ok(())
|
||||
} else {
|
||||
Err(Error::NotInitialized)
|
||||
}
|
||||
}
|
||||
|
||||
/// Send a packet
|
||||
pub fn send_packet(dest: Ipv4Address, data: &[u8], protocol: ProtocolType) -> Result<()> {
|
||||
let mut stack_opt = NETWORK_STACK.lock();
|
||||
if let Some(ref mut stack) = *stack_opt {
|
||||
stack.send_packet(dest, data, protocol)
|
||||
} else {
|
||||
Err(Error::NotInitialized)
|
||||
}
|
||||
}
|
||||
|
||||
/// Add a route
|
||||
pub fn add_route(destination: Ipv4Address, netmask: Ipv4Address, gateway: Option<Ipv4Address>, interface: String, metric: u32) -> Result<()> {
|
||||
let mut stack_opt = NETWORK_STACK.lock();
|
||||
if let Some(ref mut stack) = *stack_opt {
|
||||
stack.add_route(RouteEntry {
|
||||
destination,
|
||||
netmask,
|
||||
gateway,
|
||||
interface,
|
||||
metric,
|
||||
});
|
||||
Ok(())
|
||||
} else {
|
||||
Err(Error::NotInitialized)
|
||||
}
|
||||
}
|
||||
|
||||
/// Add an ARP entry
|
||||
pub fn add_arp_entry(ip: Ipv4Address, mac: MacAddress) -> Result<()> {
|
||||
let mut stack_opt = NETWORK_STACK.lock();
|
||||
if let Some(ref mut stack) = *stack_opt {
|
||||
stack.add_arp_entry(ip, mac);
|
||||
Ok(())
|
||||
} else {
|
||||
Err(Error::NotInitialized)
|
||||
}
|
||||
}
|
||||
@ -6,6 +6,7 @@ use crate::types::{Pid, Tid, Uid, Gid};
|
||||
use crate::error::{Error, Result};
|
||||
use crate::sync::Spinlock;
|
||||
use crate::memory::VirtAddr;
|
||||
use crate::arch::x86_64::context::Context;
|
||||
use alloc::{string::{String, ToString}, vec::Vec, collections::BTreeMap};
|
||||
use core::sync::atomic::{AtomicU32, Ordering};
|
||||
|
||||
@ -145,7 +146,7 @@ pub struct Thread {
|
||||
pub priority: i32,
|
||||
pub nice: i32, // Nice value (-20 to 19)
|
||||
pub cpu_time: u64, // Nanoseconds
|
||||
pub context: ThreadContext,
|
||||
pub context: Context,
|
||||
}
|
||||
|
||||
impl Thread {
|
||||
@ -159,7 +160,7 @@ impl Thread {
|
||||
priority,
|
||||
nice: 0,
|
||||
cpu_time: 0,
|
||||
context: ThreadContext::new(),
|
||||
context: Context::new(),
|
||||
}
|
||||
}
|
||||
|
||||
@ -174,50 +175,13 @@ impl Thread {
|
||||
}
|
||||
}
|
||||
|
||||
/// 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());
|
||||
pub 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 {
|
||||
pub struct ProcessTable {
|
||||
processes: BTreeMap<Pid, Process>,
|
||||
current_process: Option<Pid>,
|
||||
}
|
||||
@ -230,7 +194,7 @@ impl ProcessTable {
|
||||
}
|
||||
}
|
||||
|
||||
fn add_process(&mut self, process: Process) {
|
||||
pub fn add_process(&mut self, process: Process) {
|
||||
let pid = process.pid;
|
||||
self.processes.insert(pid, process);
|
||||
if self.current_process.is_none() {
|
||||
@ -258,6 +222,28 @@ impl ProcessTable {
|
||||
fn list_processes(&self) -> Vec<Pid> {
|
||||
self.processes.keys().copied().collect()
|
||||
}
|
||||
|
||||
pub fn find_thread(&self, tid: Tid) -> Option<&Thread> {
|
||||
for process in self.processes.values() {
|
||||
for thread in &process.threads {
|
||||
if thread.tid == tid {
|
||||
return Some(thread);
|
||||
}
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
pub fn find_thread_mut(&mut self, tid: Tid) -> Option<&mut Thread> {
|
||||
for process in self.processes.values_mut() {
|
||||
for thread in &mut process.threads {
|
||||
if thread.tid == tid {
|
||||
return Some(thread);
|
||||
}
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
/// Allocate a new PID
|
||||
@ -333,19 +319,13 @@ pub fn init_process_management() -> Result<()> {
|
||||
|
||||
/// 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)
|
||||
// Initialize the process table and create kernel process (PID 0)
|
||||
let kernel_pid = create_process(
|
||||
"kernel".to_string(),
|
||||
Uid(0), // root
|
||||
Gid(0), // root
|
||||
)?;
|
||||
|
||||
crate::info!("Process management initialized with kernel PID {}", kernel_pid.0);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
@ -6,6 +6,8 @@ use crate::error::{Error, Result};
|
||||
use crate::types::Tid;
|
||||
use crate::sync::Spinlock;
|
||||
use crate::time;
|
||||
use crate::arch::x86_64::context::{Context, switch_context};
|
||||
use crate::process::{PROCESS_TABLE, Thread};
|
||||
use alloc::{collections::{BTreeMap, VecDeque}, vec::Vec};
|
||||
use core::sync::atomic::{AtomicU64, Ordering};
|
||||
|
||||
@ -204,93 +206,51 @@ impl CfsRunQueue {
|
||||
}
|
||||
}
|
||||
|
||||
/// Check if run queue is empty
|
||||
pub fn is_empty(&self) -> bool {
|
||||
self.nr_running == 0
|
||||
/// Update minimum virtual runtime
|
||||
pub fn update_min_vruntime(&mut self) {
|
||||
if let Some((&next_vruntime, _)) = self.tasks_timeline.iter().next() {
|
||||
self.min_vruntime = core::cmp::max(self.min_vruntime, next_vruntime);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Real-time run queue (for FIFO/RR scheduling)
|
||||
/// Real-time run queue
|
||||
#[derive(Debug)]
|
||||
pub struct RtRunQueue {
|
||||
active: [VecDeque<SchedEntity>; MAX_RT_PRIO as usize],
|
||||
rt_nr_running: u32,
|
||||
highest_prio: i32,
|
||||
runqueue: VecDeque<SchedEntity>,
|
||||
nr_running: u32,
|
||||
}
|
||||
|
||||
impl RtRunQueue {
|
||||
pub fn new() -> Self {
|
||||
const EMPTY_QUEUE: VecDeque<SchedEntity> = VecDeque::new();
|
||||
pub const fn new() -> Self {
|
||||
Self {
|
||||
active: [EMPTY_QUEUE; MAX_RT_PRIO as usize],
|
||||
rt_nr_running: 0,
|
||||
highest_prio: MAX_RT_PRIO,
|
||||
runqueue: VecDeque::new(),
|
||||
nr_running: 0,
|
||||
}
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
self.runqueue.push_back(se);
|
||||
self.nr_running += 1;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
if let Some(pos) = self.runqueue.iter().position(|task| task.tid == se.tid) {
|
||||
self.nr_running -= 1;
|
||||
self.runqueue.remove(pos);
|
||||
true
|
||||
} else {
|
||||
false
|
||||
}
|
||||
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);
|
||||
}
|
||||
}
|
||||
if self.nr_running > 0 {
|
||||
self.nr_running -= 1;
|
||||
self.runqueue.pop_front()
|
||||
} else {
|
||||
None
|
||||
}
|
||||
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
|
||||
}
|
||||
}
|
||||
|
||||
@ -391,6 +351,10 @@ struct Scheduler {
|
||||
nr_cpus: u32,
|
||||
entities: BTreeMap<Tid, SchedEntity>,
|
||||
need_resched: bool,
|
||||
cfs: CfsRunQueue,
|
||||
rt: RtRunQueue,
|
||||
current: Option<Tid>,
|
||||
nr_switches: u64,
|
||||
}
|
||||
|
||||
impl Scheduler {
|
||||
@ -400,6 +364,19 @@ impl Scheduler {
|
||||
nr_cpus: 1, // Single CPU for now
|
||||
entities: BTreeMap::new(),
|
||||
need_resched: false,
|
||||
cfs: CfsRunQueue {
|
||||
tasks_timeline: BTreeMap::new(),
|
||||
min_vruntime: 0,
|
||||
nr_running: 0,
|
||||
load_weight: 0,
|
||||
runnable_weight: 0,
|
||||
},
|
||||
rt: RtRunQueue {
|
||||
runqueue: VecDeque::new(),
|
||||
nr_running: 0,
|
||||
},
|
||||
current: None,
|
||||
nr_switches: 0,
|
||||
}
|
||||
}
|
||||
|
||||
@ -453,12 +430,62 @@ impl Scheduler {
|
||||
None
|
||||
}
|
||||
|
||||
fn set_need_resched(&mut self) {
|
||||
self.need_resched = true;
|
||||
/// Pick next task to run
|
||||
fn pick_next_task(&mut self) -> Option<Tid> {
|
||||
// Try CFS first
|
||||
if let Some(se) = self.cfs.pick_next_task() {
|
||||
self.current = Some(se.tid);
|
||||
return Some(se.tid);
|
||||
}
|
||||
|
||||
// Then try RT
|
||||
if let Some(se) = self.rt.pick_next_task() {
|
||||
self.current = Some(se.tid);
|
||||
return Some(se.tid);
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
|
||||
fn clear_need_resched(&mut self) {
|
||||
self.need_resched = false;
|
||||
/// Switch to a task
|
||||
fn switch_to(&mut self, tid: Tid) {
|
||||
// Save current task's context
|
||||
if let Some(current_tid) = self.current {
|
||||
if current_tid != tid {
|
||||
// Look up current and next threads
|
||||
let process_table = PROCESS_TABLE.lock();
|
||||
if let (Some(current_thread), Some(next_thread)) = (
|
||||
process_table.find_thread(current_tid),
|
||||
process_table.find_thread(tid)
|
||||
) {
|
||||
// Update scheduler state
|
||||
self.current = Some(tid);
|
||||
self.nr_switches += 1;
|
||||
|
||||
// Drop the lock before context switch to avoid deadlock
|
||||
drop(process_table);
|
||||
|
||||
// TODO: Implement actual context switch
|
||||
// This would involve:
|
||||
// 1. Saving current thread's context
|
||||
// 2. Loading next thread's context
|
||||
// 3. Switching page tables if different processes
|
||||
// 4. Updating stack pointer and instruction pointer
|
||||
|
||||
crate::info!("Context switch from TID {} to TID {}", current_tid.0, tid.0);
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// First task or same task
|
||||
self.current = Some(tid);
|
||||
self.nr_switches += 1;
|
||||
}
|
||||
|
||||
/// Set need resched flag
|
||||
fn set_need_resched(&mut self) {
|
||||
self.need_resched = true;
|
||||
}
|
||||
}
|
||||
|
||||
@ -472,61 +499,122 @@ pub fn init() -> Result<()> {
|
||||
}
|
||||
|
||||
/// Add a task to the scheduler
|
||||
pub fn add_task(tid: Tid, policy: SchedulerPolicy, nice: i32) {
|
||||
pub fn add_task(pid: crate::types::Pid) -> Result<()> {
|
||||
let mut scheduler = SCHEDULER.lock();
|
||||
scheduler.add_task(tid, policy, nice);
|
||||
|
||||
// Create a scheduler entity for the process
|
||||
let tid = crate::types::Tid(pid.0); // Simple mapping for now
|
||||
let se = SchedEntity::new(tid, SchedulerPolicy::Normal, DEFAULT_PRIO);
|
||||
|
||||
// Add to CFS runqueue
|
||||
scheduler.cfs.enqueue_task(se);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// 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<()> {
|
||||
pub fn remove_task(pid: crate::types::Pid) -> 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)
|
||||
// Remove from all runqueues
|
||||
let tid = crate::types::Tid(pid.0);
|
||||
|
||||
// Create a minimal SchedEntity for removal
|
||||
let se = SchedEntity::new(tid, SchedulerPolicy::Normal, DEFAULT_PRIO);
|
||||
scheduler.cfs.dequeue_task(&se);
|
||||
scheduler.rt.dequeue_task(&se);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Schedule next task (called from syscall exit or timer interrupt)
|
||||
pub fn schedule() {
|
||||
let mut scheduler = SCHEDULER.lock();
|
||||
|
||||
// Pick next task to run
|
||||
if let Some(next) = scheduler.pick_next_task() {
|
||||
// Switch to next task
|
||||
scheduler.switch_to(next);
|
||||
}
|
||||
}
|
||||
|
||||
/// Get scheduler statistics
|
||||
pub fn get_scheduler_stats() -> (u32, u32, bool) {
|
||||
/// Get current running task
|
||||
pub fn current_task() -> Option<crate::types::Pid> {
|
||||
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)
|
||||
scheduler.current.map(|tid| crate::types::Pid(tid.0))
|
||||
}
|
||||
|
||||
/// Yield current task (alias for yield_task)
|
||||
pub fn yield_now() {
|
||||
yield_task();
|
||||
}
|
||||
|
||||
/// Yield current task
|
||||
pub fn yield_task() {
|
||||
let mut scheduler = SCHEDULER.lock();
|
||||
scheduler.set_need_resched();
|
||||
}
|
||||
|
||||
/// Sleep current task for specified duration
|
||||
pub fn sleep_task(duration_ms: u64) {
|
||||
// TODO: implement proper sleep mechanism with timer integration
|
||||
// For now, just yield
|
||||
yield_task();
|
||||
}
|
||||
|
||||
/// Wake up a task
|
||||
pub fn wake_task(pid: crate::types::Pid) -> Result<()> {
|
||||
let mut scheduler = SCHEDULER.lock();
|
||||
let tid = crate::types::Tid(pid.0);
|
||||
|
||||
// TODO: Move from wait queue to runqueue
|
||||
// For now, just ensure it's in the runqueue
|
||||
let se = SchedEntity::new(tid, SchedulerPolicy::Normal, DEFAULT_PRIO);
|
||||
scheduler.cfs.enqueue_task(se);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Set task priority
|
||||
pub fn set_task_priority(pid: crate::types::Pid, priority: i32) -> Result<()> {
|
||||
let mut scheduler = SCHEDULER.lock();
|
||||
let tid = crate::types::Tid(pid.0);
|
||||
|
||||
// TODO: Update priority in runqueue
|
||||
// This would require finding the task and updating its priority
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Get scheduler statistics
|
||||
pub fn get_scheduler_stats() -> SchedulerStats {
|
||||
let scheduler = SCHEDULER.lock();
|
||||
SchedulerStats {
|
||||
total_tasks: (scheduler.cfs.nr_running + scheduler.rt.nr_running) as usize,
|
||||
running_tasks: if scheduler.current.is_some() { 1 } else { 0 },
|
||||
context_switches: scheduler.nr_switches,
|
||||
load_average: scheduler.cfs.load_weight as f64 / 1024.0,
|
||||
}
|
||||
}
|
||||
|
||||
/// Scheduler statistics
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct SchedulerStats {
|
||||
pub total_tasks: usize,
|
||||
pub running_tasks: usize,
|
||||
pub context_switches: u64,
|
||||
pub load_average: f64,
|
||||
}
|
||||
|
||||
/// 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)
|
||||
}
|
||||
|
||||
/// Timer tick - called from timer interrupt
|
||||
@ -555,14 +643,3 @@ pub fn scheduler_tick() {
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// 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)
|
||||
}
|
||||
|
||||
@ -95,55 +95,91 @@ pub fn handle_syscall(args: SyscallArgs) -> u64 {
|
||||
|
||||
/// Process management syscalls
|
||||
pub fn sys_fork() -> Result<u64> {
|
||||
// TODO: Implement fork
|
||||
// 1. Allocate new PID
|
||||
// 2. Copy current process
|
||||
// 3. Set up copy-on-write memory
|
||||
// 4. Add to scheduler
|
||||
// 5. Return child PID to parent, 0 to child
|
||||
use crate::process::create_process;
|
||||
use crate::scheduler::add_task;
|
||||
|
||||
let new_pid = allocate_pid();
|
||||
// For now, just return the new PID
|
||||
Ok(new_pid.0 as u64)
|
||||
// Get current process
|
||||
let current = current_process().ok_or(Error::ESRCH)?;
|
||||
|
||||
// Fork the process
|
||||
let child = current.fork()?;
|
||||
let child_pid = child.pid;
|
||||
|
||||
// Add child to process table and scheduler
|
||||
let mut table = crate::process::PROCESS_TABLE.lock();
|
||||
table.add_process(child.clone());
|
||||
drop(table);
|
||||
|
||||
// Add to scheduler
|
||||
add_task(child_pid)?;
|
||||
|
||||
// Return child PID to parent (in child, this would return 0)
|
||||
Ok(child_pid.0 as u64)
|
||||
}
|
||||
|
||||
pub fn sys_execve(filename: u64, argv: u64, envp: u64) -> Result<u64> {
|
||||
// TODO: Implement execve
|
||||
// 1. Load program from filesystem
|
||||
// 2. Set up new memory layout
|
||||
// 3. Parse arguments and environment
|
||||
// 4. Set up initial stack
|
||||
// 5. Jump to entry point
|
||||
use crate::memory::{copy_string_from_user, UserPtr};
|
||||
|
||||
Err(Error::ENOSYS)
|
||||
// Copy filename from user space
|
||||
let user_ptr = UserPtr::from_const(filename as *const u8)?;
|
||||
let filename_str = copy_string_from_user(user_ptr, 256)?;
|
||||
|
||||
// Get current process
|
||||
let mut current = current_process().ok_or(Error::ESRCH)?;
|
||||
|
||||
// Execute new program (with empty args for now)
|
||||
current.exec(&filename_str, alloc::vec![])?;
|
||||
|
||||
// This doesn't return on success
|
||||
Ok(0)
|
||||
}
|
||||
|
||||
pub fn sys_exit(exit_code: i32) -> Result<u64> {
|
||||
// TODO: Implement exit
|
||||
// 1. Set process state to zombie
|
||||
// 2. Free resources
|
||||
// 3. Notify parent
|
||||
// 4. Schedule next process
|
||||
use crate::scheduler::remove_task;
|
||||
|
||||
// Get current process
|
||||
if let Some(mut current) = current_process() {
|
||||
// Set exit code and mark as zombie
|
||||
current.exit(exit_code);
|
||||
|
||||
// Remove from scheduler
|
||||
let _ = remove_task(current.pid);
|
||||
|
||||
// In a real implementation, this would:
|
||||
// 1. Free all process resources
|
||||
// 2. Notify parent process
|
||||
// 3. Reparent children to init
|
||||
// 4. Schedule next process
|
||||
|
||||
// Signal scheduler to switch to next process
|
||||
crate::scheduler::schedule();
|
||||
}
|
||||
|
||||
// This syscall doesn't return
|
||||
panic!("Process exit with code {}", exit_code);
|
||||
loop {
|
||||
unsafe { core::arch::asm!("hlt") };
|
||||
}
|
||||
}
|
||||
|
||||
pub fn sys_wait4(pid: u64, status: u64, options: u64, rusage: u64) -> Result<u64> {
|
||||
// TODO: Implement wait4
|
||||
// 1. Find child process
|
||||
// 2. Block until child exits
|
||||
// 3. Return child PID and status
|
||||
use crate::memory::{copy_to_user, UserPtr};
|
||||
|
||||
Err(Error::ECHILD)
|
||||
// Get current process
|
||||
let current = current_process().ok_or(Error::ESRCH)?;
|
||||
|
||||
// Wait for child process
|
||||
let (child_pid, exit_status) = current.wait()?;
|
||||
|
||||
// If status pointer is provided, write exit status
|
||||
if status != 0 {
|
||||
let status_ptr = UserPtr::new(status as *mut i32)?;
|
||||
copy_to_user(status_ptr.cast(), &exit_status.to_ne_bytes())?;
|
||||
}
|
||||
|
||||
Ok(child_pid.0 as u64)
|
||||
}
|
||||
|
||||
pub fn sys_kill(pid: i32, signal: i32) -> Result<u64> {
|
||||
// TODO: Implement kill
|
||||
// 1. Find target process
|
||||
// 2. Send signal
|
||||
// 3. Wake up process if needed
|
||||
|
||||
if let Some(mut process) = find_process(Pid(pid as u32)) {
|
||||
process.send_signal(signal)?;
|
||||
Ok(0)
|
||||
@ -179,77 +215,176 @@ pub fn sys_gettid() -> u32 {
|
||||
|
||||
/// File operation syscalls
|
||||
pub fn sys_read(fd: i32, buf: u64, count: u64) -> Result<u64> {
|
||||
// TODO: Implement read
|
||||
// 1. Get file from file descriptor table
|
||||
// 2. Read from file
|
||||
// 3. Copy to user buffer
|
||||
use crate::memory::{copy_to_user, UserPtr};
|
||||
use crate::fs::{get_file_descriptor, read_file};
|
||||
|
||||
Err(Error::ENOSYS)
|
||||
// Validate parameters
|
||||
if count == 0 {
|
||||
return Ok(0);
|
||||
}
|
||||
|
||||
// Get file from file descriptor table
|
||||
let file = get_file_descriptor(fd).ok_or(Error::EBADF)?;
|
||||
|
||||
// Create a kernel buffer to read into
|
||||
let mut kernel_buf = alloc::vec![0u8; count as usize];
|
||||
|
||||
// Read from file
|
||||
let bytes_read = read_file(&file, &mut kernel_buf)?;
|
||||
|
||||
// Copy to user buffer
|
||||
let user_ptr = UserPtr::new(buf as *mut u8)?;
|
||||
copy_to_user(user_ptr, &kernel_buf[..bytes_read])?;
|
||||
|
||||
Ok(bytes_read as u64)
|
||||
}
|
||||
|
||||
pub fn sys_write(fd: i32, buf: u64, count: u64) -> Result<u64> {
|
||||
// TODO: Implement write
|
||||
// 1. Get file from file descriptor table
|
||||
// 2. Copy from user buffer
|
||||
// 3. Write to file
|
||||
use crate::memory::{copy_from_user, UserPtr};
|
||||
use crate::fs::{get_file_descriptor, write_file};
|
||||
|
||||
if fd == 1 || fd == 2 { // stdout or stderr
|
||||
// For now, just return the count as if we wrote to console
|
||||
Ok(count)
|
||||
} else {
|
||||
Err(Error::EBADF)
|
||||
// Validate parameters
|
||||
if count == 0 {
|
||||
return Ok(0);
|
||||
}
|
||||
|
||||
// Handle stdout/stderr specially for now
|
||||
if fd == 1 || fd == 2 {
|
||||
// Create kernel buffer and copy from user
|
||||
let mut kernel_buf = alloc::vec![0u8; count as usize];
|
||||
let user_ptr = UserPtr::from_const(buf as *const u8)?;
|
||||
copy_from_user(&mut kernel_buf, user_ptr)?;
|
||||
|
||||
// Write to console (for debugging)
|
||||
if let Ok(s) = core::str::from_utf8(&kernel_buf) {
|
||||
crate::print!("{}", s);
|
||||
}
|
||||
|
||||
return Ok(count);
|
||||
}
|
||||
|
||||
// Get file from file descriptor table
|
||||
let file = get_file_descriptor(fd).ok_or(Error::EBADF)?;
|
||||
|
||||
// Create kernel buffer and copy from user
|
||||
let mut kernel_buf = alloc::vec![0u8; count as usize];
|
||||
let user_ptr = UserPtr::from_const(buf as *const u8)?;
|
||||
copy_from_user(&mut kernel_buf, user_ptr)?;
|
||||
|
||||
// Write to file
|
||||
let bytes_written = write_file(&file, &kernel_buf)?;
|
||||
|
||||
Ok(bytes_written as u64)
|
||||
}
|
||||
|
||||
pub fn sys_open(filename: u64, flags: i32, mode: u32) -> Result<u64> {
|
||||
// TODO: Implement open
|
||||
// 1. Copy filename from user space
|
||||
// 2. Open file in VFS
|
||||
// 3. Allocate file descriptor
|
||||
// 4. Add to process file table
|
||||
use crate::memory::{copy_string_from_user, UserPtr};
|
||||
use crate::fs::{open_file, allocate_file_descriptor};
|
||||
|
||||
Err(Error::ENOSYS)
|
||||
// Copy filename from user space
|
||||
let user_ptr = UserPtr::from_const(filename as *const u8)?;
|
||||
let filename_str = copy_string_from_user(user_ptr, 256)?; // Max 256 chars
|
||||
|
||||
// Open file in VFS
|
||||
let file = open_file(&filename_str, flags, mode)?;
|
||||
|
||||
// Allocate file descriptor and add to process file table
|
||||
let fd = allocate_file_descriptor(file)?;
|
||||
|
||||
Ok(fd as u64)
|
||||
}
|
||||
|
||||
pub fn sys_close(fd: i32) -> Result<u64> {
|
||||
// TODO: Implement close
|
||||
// 1. Get file from file descriptor table
|
||||
// 2. Remove from table
|
||||
// 3. Close file
|
||||
use crate::fs::close_file_descriptor;
|
||||
|
||||
Err(Error::ENOSYS)
|
||||
// Close file descriptor
|
||||
close_file_descriptor(fd)?;
|
||||
|
||||
Ok(0)
|
||||
}
|
||||
|
||||
/// Memory management syscalls
|
||||
pub fn sys_mmap(addr: u64, length: u64, prot: i32, flags: i32, fd: i32, offset: i64) -> Result<u64> {
|
||||
// TODO: Implement mmap
|
||||
// 1. Validate parameters
|
||||
// 2. Find free virtual memory region
|
||||
// 3. Create VMA
|
||||
// 4. Set up page tables
|
||||
// 5. Return mapped address
|
||||
use crate::memory::{allocate_virtual_memory, VmaArea, VirtAddr};
|
||||
|
||||
Err(Error::ENOSYS)
|
||||
// Validate parameters
|
||||
if length == 0 {
|
||||
return Err(Error::EINVAL);
|
||||
}
|
||||
|
||||
// Align length to page boundary
|
||||
let page_size = 4096u64;
|
||||
let aligned_length = (length + page_size - 1) & !(page_size - 1);
|
||||
|
||||
// Allocate virtual memory region
|
||||
let vma = if addr == 0 {
|
||||
// Let kernel choose address
|
||||
allocate_virtual_memory(aligned_length, prot as u32, flags as u32)?
|
||||
} else {
|
||||
// Use specified address (with validation)
|
||||
let virt_addr = VirtAddr::new(addr as usize);
|
||||
let vma = VmaArea::new(virt_addr, VirtAddr::new((addr + aligned_length) as usize), prot as u32);
|
||||
|
||||
// TODO: Validate that the address range is available
|
||||
// TODO: Set up page tables
|
||||
|
||||
vma
|
||||
};
|
||||
|
||||
// Handle file mapping
|
||||
if fd >= 0 {
|
||||
// TODO: Map file into memory
|
||||
// This would involve getting the file from fd and setting up file-backed pages
|
||||
}
|
||||
|
||||
Ok(vma.vm_start.as_usize() as u64)
|
||||
}
|
||||
|
||||
pub fn sys_munmap(addr: u64, length: u64) -> Result<u64> {
|
||||
// TODO: Implement munmap
|
||||
// 1. Find VMA containing address
|
||||
// 2. Unmap pages
|
||||
// 3. Free physical memory
|
||||
// 4. Remove VMA
|
||||
use crate::memory::{free_virtual_memory, VirtAddr};
|
||||
|
||||
Err(Error::ENOSYS)
|
||||
// Validate parameters
|
||||
if length == 0 {
|
||||
return Err(Error::EINVAL);
|
||||
}
|
||||
|
||||
// Align to page boundaries
|
||||
let page_size = 4096u64;
|
||||
let aligned_addr = addr & !(page_size - 1);
|
||||
let aligned_length = (length + page_size - 1) & !(page_size - 1);
|
||||
|
||||
// Free virtual memory region
|
||||
free_virtual_memory(VirtAddr::new(aligned_addr as usize), aligned_length)?;
|
||||
|
||||
Ok(0)
|
||||
}
|
||||
|
||||
pub fn sys_brk(addr: u64) -> Result<u64> {
|
||||
// TODO: Implement brk
|
||||
// 1. Get current heap end
|
||||
// 2. Validate new address
|
||||
// 3. Expand or shrink heap
|
||||
// 4. Return new heap end
|
||||
use crate::memory::{get_heap_end, set_heap_end, VirtAddr};
|
||||
|
||||
Err(Error::ENOSYS)
|
||||
// Get current heap end
|
||||
let current_brk = get_heap_end();
|
||||
|
||||
if addr == 0 {
|
||||
// Return current heap end
|
||||
return Ok(current_brk.as_usize() as u64);
|
||||
}
|
||||
|
||||
let new_brk = VirtAddr::new(addr as usize);
|
||||
|
||||
// Validate new address
|
||||
if new_brk < current_brk {
|
||||
// Shrinking heap - free pages
|
||||
// TODO: Free pages between new_brk and current_brk
|
||||
} else if new_brk > current_brk {
|
||||
// Expanding heap - allocate pages
|
||||
// TODO: Allocate pages between current_brk and new_brk
|
||||
}
|
||||
|
||||
// Update heap end
|
||||
set_heap_end(new_brk)?;
|
||||
|
||||
Ok(new_brk.as_usize() as u64)
|
||||
}
|
||||
|
||||
/// Architecture-specific syscall entry point
|
||||
|
||||
@ -99,7 +99,7 @@ impl HrTimer {
|
||||
|
||||
pub fn is_expired(&self) -> bool {
|
||||
let now = match self.base {
|
||||
HrTimerBase::Monotonic => get_monotonic_time(),
|
||||
HrTimerBase::Monotonic => monotonic_time(),
|
||||
HrTimerBase::Realtime => get_realtime(),
|
||||
HrTimerBase::Boottime => get_boottime(),
|
||||
HrTimerBase::Tai => get_realtime(), // Simplified
|
||||
@ -160,9 +160,18 @@ pub fn get_time_ns() -> u64 {
|
||||
get_jiffies().0 * NSEC_PER_JIFFY
|
||||
}
|
||||
|
||||
/// Get high resolution time
|
||||
pub fn ktime_get() -> TimeSpec {
|
||||
// TODO: Read from high-resolution clock source (TSC, etc.)
|
||||
// For now, return monotonic time based on jiffies
|
||||
get_current_time()
|
||||
}
|
||||
|
||||
/// Get monotonic time (time since boot)
|
||||
pub fn get_monotonic_time() -> TimeSpec {
|
||||
TimeSpec::from_ns(get_time_ns())
|
||||
pub fn monotonic_time() -> TimeSpec {
|
||||
let jiffies = get_jiffies();
|
||||
let ns = jiffies.0 * NSEC_PER_JIFFY;
|
||||
TimeSpec::from_ns(ns)
|
||||
}
|
||||
|
||||
/// Get boot time
|
||||
|
||||
@ -172,3 +172,13 @@ pub struct Milliseconds(pub u64);
|
||||
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
|
||||
pub struct Seconds(pub u64);
|
||||
|
||||
/// Device ID type
|
||||
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
|
||||
pub struct DeviceId(pub u32);
|
||||
|
||||
impl fmt::Display for DeviceId {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
write!(f, "{}", self.0)
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user