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section .start_section
dd _start
; Initialize stack
section .bss
align 16
global STACK_BOTTOM
global STACK_TOP
STACK_BOTTOM:
resb 0x4000
STACK_TOP:
section .text
global _start
extern kernel_main
_start:
mov esp, STACK_TOP
push ebx
push eax
cli
call kernel_main
cli
hlt_L:
hlt
jmp hlt_L
global jump_userspace
jump_userspace:
cli
mov ebx, dword [esp + 4]
mov ax, 0x23
mov ds, ax
mov es, ax
mov fs, ax
mov gs, ax
mov eax, esp
push 0x23
push eax
pushf
; Enable interrupts
pop eax
or eax, 0x200
push eax
push 0x1B
push ebx
mov ebp, ebx
iret
section .end_section
global ASM_KERNEL_END
ASM_KERNEL_END:
; Kernel size detection
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