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loader.asm
35 lines (29 loc) · 923 Bytes
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loader.asm
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; Declare constants for the multiboot header.
MBALIGN equ 1 << 0 ; align loaded modules on page boundaries
MEMINFO equ 1 << 1 ; provide memory map
FLAGS equ MBALIGN | MEMINFO ; this is the Multiboot 'flag' field
MAGIC equ 0x1BADB002 ; 'magic number' lets bootloader find the header
CHECKSUM equ -(MAGIC + FLAGS) ; checksum of above, to prove we are multiboot
STACKSIZE equ (32 * 1024)
section .multiboot
align 4
dd MAGIC
dd FLAGS
dd CHECKSUM
section .bss
align 16
; Setup stack here in bss for 32 KB
stack_bottom:
resb STACKSIZE
stack_top:
section .text
global _start:function (_start.end - _start)
_start:
mov esp, $stack_top ; setup stack
extern kernel_main
call kernel_main ; drop in to the kernel in C
cli
.hang: ; loop infinitely here and do nothing
hlt
jmp .hang
.end: