loader.s

global loader


KERNEL_STACK_SIZE equ 4096
MODULEALIGN equ 1 << 0
MEMINFO equ 1 << 1


FLAGS equ MODULEALIGN | MEMINFO
MAGIC_NUMBER equ 0x1BADB002


CHECKSUM equ - (MAGIC_NUMBER + FLAGS)


extern KERNEL_PHYSICAL_START
extern KERNEL_PHYSICAL_END
extern kernel_virtual_start
extern kernel_virtual_end



section .bss

align 4

KERNEL_STACK:
   
    resb KERNEL_STACK_SIZE


section .text

align 4
   
    dd MAGIC_NUMBER
   
    dd FLAGS
  
    dd CHECKSUM


loader:
   
    mov esp, KERNEL_STACK + KERNEL_STACK_SIZE

    extern kmain

    push $KERNEL_PHYSICAL_END
    push $KERNEL_PHYSICAL_START
    push $kernel_virtual_end
    push $kernel_virtual_start

    call kmain
    .loop:

      jmp .loop