; since we have no stack we have to create one for the OS

global loader
MAGIC_NUMBER 	equ 0x1BADB002
FLAGS 			equ 0x0
CHECKSUM 		equ -MAGIC_NUMBER


; size in bytes of stack 
KERNEL_STACK_SIZE	equ 4096

; external labels(cdecl) calling convention
extern yote

section .bss
align 4		; aligning to bytes for x86(32-bit) reasons
; because this is the first thing we actually do (virual)address 0x00000000 will 
; contain 4KB of memory for our stack
kernel_stack:
	resb KERNEL_STACK_SIZE	; reserver bytes instruction
	; point to what will be bottom of stack
	; which will grow down towards (virtual)address 0x00000000
	mov esp, kernel_stack + KERNEL_STACK_SIZE	

section .text
; align all instructions to 4 byte boundary by the x86 instruction set law
align 4
	; dropping our magic and other things into memory
	dd MAGIC_NUMBER
	dd FLAGS
	dd CHECKSUM

loader:
	call yote
.loop:
	jmp .loop

; section for our kernel stack
KERNEL_STACK_SIZE	equ 4096
section .bss
align 4	; aligned to 4 bytes for performance
kernel_stack:
	; (res)erve (b)ytes x
	resb KERNEL_STACK_SIZE	; 4k of stack size in mem
	; now we setup the stack pointer for our kernel 
	mov esp, kernel_stack + KERNEL_STACK_SIZE