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MBOOT_PAGE_ALIGN equ 1<<0
MBOOT_MEM_INFO equ 1<<1
MBOOT_USE_GFX equ 1<<2
MBOOT_HEADER_MAGIC equ 0x1BADB002
MBOOT_HEADER_FLAGS equ MBOOT_PAGE_ALIGN | MBOOT_MEM_INFO | MBOOT_USE_GFX
MBOOT_CHECKSUM equ -(MBOOT_HEADER_MAGIC + MBOOT_HEADER_FLAGS)
[BITS 32]
section .multiboot
align 4
dd MBOOT_HEADER_MAGIC
dd MBOOT_HEADER_FLAGS
dd MBOOT_CHECKSUM
dd 0x00000000 ; header_addr
dd 0x00000000 ; load_addr
dd 0x00000000 ; load_end_addr
dd 0x00000000 ; bss_end_addr
dd 0x00000000 ; entry_addr
; Graphics requests
dd 0x00000000 ; 0 = linear graphics
dd 1024
dd 768
dd 32
section .bss
align 16
stack_bottom:
resb 16384 ; 16 KiB
stack_top:
[GLOBAL _start] ; this is the entry point. we tell linker script to set start address of kernel elf file.
[EXTERN kmain]
section .text
_start:
mov esp, stack_top
; push multiboot parameter to kmain()
push ebx
; ...and run!
cli
call kmain
;never reach here
cli
hlt
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