minix/kernel/arch/i386/multiboot.S
Arun Thomas 93ae43f577 boot: Add multiboot support
Not yet fully spec-compliant; work in progress
2011-06-24 17:21:51 +02:00

73 lines
1.4 KiB
ArmAsm

#include "kernel/kernel.h" /* configures the kernel */
#include <minix/config.h>
#include <minix/const.h>
#include <minix/com.h>
#include <machine/asm.h>
#include <machine/interrupt.h>
#include "archconst.h"
#include "kernel/const.h"
#include "kernel/proc.h"
#include "sconst.h"
#include <machine/multiboot.h>
#define GDT_SET_ENTRY(selector, base, limit) \
mov %ebp, %edi; \
add $(_C_LABEL(gdt) + selector), %edi; \
mov base, %eax; \
movw %ax, 2(%edi); \
shr $16, %eax; \
movb %al, 4(%edi); \
and $0xff00, %ax; \
andw $0xff, 6(%edi); \
or %ax, 6(%edi); \
mov limit, %eax; \
movw %ax, (%edi); \
shr $16, %eax; \
and $0xf, %ax; \
andb $0xf0, 6(%edi); \
or %ax, 6(%edi); \
IMPORT(pre_init)
.extern kernel_init
ENTRY(multiboot_init)
mov $(GDT_SIZE*DESC_SIZE), %eax
mov $(_C_LABEL(gdt) + GDT_SELECTOR), %edi
mov %ax, (%edi)
mov $_C_LABEL(gdt), %eax
mov %eax, 2(%edi)
lgdt (%edi)
ljmp $(CS_SELECTOR), $reload_cs
reload_cs:
mov $DS_SELECTOR, %eax
mov %eax, %ds
mov %eax, %ss
mov %eax, %es
mov %eax, %fs
mov %eax, %gs
mov $(multiboot_stack + MULTIBOOT_STACK_SIZE), %esp
push %ebx
call _C_LABEL(pre_init)
add $4, %esp
/* return to old boot code of kernel */
push %eax
push $MULTIBOOT_PARAM_BUF_SIZE
push $_C_LABEL(multiboot_param_buf)
push $0
mov $ES_SELECTOR, %eax
mov %eax, %es
jmp kernel_init
.data
LABEL(multiboot_param_buf)
.space MULTIBOOT_PARAM_BUF_SIZE
multiboot_stack:
.space MULTIBOOT_STACK_SIZE + 4