# boot.S (x86, i386) — multiboot header + entry.
# The Multiboot1 header lets QEMU -kernel (and GRUB) load us directly.
# We set a stack and call kmain(). Irreducible asm part for x86.

	.set MB_MAGIC,    0x1BADB002
	.set MB_FLAGS,    0x0
	.set MB_CHECKSUM, -(MB_MAGIC + MB_FLAGS)

	.section .multiboot, "a"
	.align 4
	.long MB_MAGIC
	.long MB_FLAGS
	.long MB_CHECKSUM

	.section .bss
	.align 16
stack_bottom:
	.skip 0x4000        # 16 KiB stack
stack_top:

	.section .text.boot
	.globl _start
	.type _start, @function
_start:
	mov	$stack_top, %esp    # set up the stack
	call	kmain
1:	hlt                         # kmain shouldn't return; if it does, halt
	jmp	1b