section boot.text progbits alloc exec nowrite align=16 MB_PAGE_ALIGN equ 1<<0 ; Add multiboot header MB_MEM_FIELDS equ 1<<1 ; to boot.text section %macro multiboot_header 1 ; This file should be linked first align 4 dd 0x1BADB002 dd %1 dd -(0x1BADB002 + (%1)) %endmacro multiboot_header MB_PAGE_ALIGN | MB_MEM_FIELDS db 'kryptOS version 0.02.01',0,'http://kr4z.com/',0 global entry entry: ; Boot loader jumps to here mov ecx, 0x4FFFFF ; Set up stack under the mov esp, ecx ; main kernel code at 0x500000 push ebx ; Push arguments to start() push eax ; eax = 0x2BADB002, ebx = pointer to ; multiboot structure extern start call start ; Call start() hang: ; We shouldn't return from start() jmp hang ; but if we do, hang (if this area of ; memory hasn't been written over yet...)