global _start
global stack_ptr

extern kernel_main

; declare some constants
MODULEALIGN equ 1<<0            ; align loaded modules on page boundaries
MEMINFO equ 1<<1                ; provide memory map
FLAGS equ MODULEALIGN | 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

; the bootloader will search for this magic sequence
; and recognize us as a multiboot kernel
section .multiboot
align 4
MultiBootHeader:
  dd MAGIC
  dd FLAGS
  dd CHECKSUM

section .code
; setup the stack
STACKSIZE equ 0x16384

_start:
  mov esp, stack+STACKSIZE
  push eax
  push ebx

  call kernel_main

  cli

hang:
  hlt
  jmp hang

section .bss
align 4
stack:
  resb STACKSIZE
stack_ptr: