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[bits 32]
global start
start:
mov esp, _sys_stack ; Points stack to stack area
jmp stublet
; Align with 4 Bytes
ALIGN 4
mboot:
; Multiboot macros
MULTIBOOT_PAGE_ALIGN equ 1<<0
MULTIBOOT_MEMORY_INFO equ 1<<1
MULTIBOOT_AOUT_KLUDGE equ 1<<16
MULTIBOOT_HEADER_MAGIC equ 0x1BADB002
MULTIBOOT_HEADER_FLAGS equ MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO | MULTIBOOT_AOUT_KLUDGE
MULTIBOOT_CHECKSUM equ -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
EXTERN code, bss, end
; GRUB Multiboot header
dd MULTIBOOT_HEADER_MAGIC
dd MULTIBOOT_HEADER_FLAGS
dd MULTIBOOT_CHECKSUM
; AOUT kludge
dd mboot
dd code
dd bss
dd end
dd start
; Endless loop
extern kernel_main
stublet:
; Load multiboot information
push esp
push ebx
cli
call kernel_main
jmp $
%include "src/kernel/gdt/gdt.asm"
%include "src/kernel/interrupts/idt.asm"
%include "src/kernel/interrupts/isr.asm"
%include "src/kernel/interrupts/irq.asm"
%include "src/kernel/interact.asm"
global switch_to_user
extern test_user
switch_to_user:
sti
mov ax, 0x23
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov eax, esp
push 0x23
push eax
pushf
push 0x1B
push test_user
iret
; Store the stack
SECTION .bss
resb 0x2000 ; Reserve 8KiB
_sys_stack:
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