68 líneas
1.5 KiB
ArmAsm
68 líneas
1.5 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Multiboot header for the Rust kernel */
|
|
|
|
.section .multiboot_header
|
|
.align 8
|
|
|
|
/* Multiboot2 header */
|
|
multiboot_header_start:
|
|
.long 0xe85250d6 /* magic number */
|
|
.long 0 /* architecture: i386 */
|
|
.long multiboot_header_end - multiboot_header_start /* header length */
|
|
.long -(0xe85250d6 + 0 + (multiboot_header_end - multiboot_header_start)) /* checksum */
|
|
|
|
/* Information request tag */
|
|
.short 1 /* type */
|
|
.short 0 /* flags */
|
|
.long 12 /* size */
|
|
.long 6 /* memory map */
|
|
|
|
/* End tag */
|
|
.short 0 /* type */
|
|
.short 0 /* flags */
|
|
.long 8 /* size */
|
|
multiboot_header_end:
|
|
|
|
.section .text
|
|
.global _start
|
|
.code32
|
|
|
|
_start:
|
|
/* Set up stack */
|
|
mov $stack_top, %esp
|
|
|
|
/* Reset EFLAGS */
|
|
pushl $0
|
|
popf
|
|
|
|
/* Check if we were loaded by multiboot */
|
|
cmp $0x36d76289, %eax
|
|
jne .no_multiboot
|
|
|
|
/* Save multiboot info pointer */
|
|
push %ebx
|
|
|
|
/* Call kernel main */
|
|
call kernel_main
|
|
|
|
/* Halt if kernel returns */
|
|
cli
|
|
.hang:
|
|
hlt
|
|
jmp .hang
|
|
|
|
.no_multiboot:
|
|
/* No multiboot - just halt */
|
|
cli
|
|
hlt
|
|
|
|
.section .bss
|
|
.align 16
|
|
stack_bottom:
|
|
.skip 16384 /* 16KB stack */
|
|
stack_top:
|
|
|
|
.section .data
|
|
multiboot_info_ptr:
|
|
.long 0
|