; second stage boot loader C startup
	cpu 8086
	bits 16
	section .startup

; memory reserved at the top of RAM for the kernel stack
STACKSZ equ 4096

extern kmain
extern _bss_start_off
extern _bss_size

global _start
_start:
	; TODO floppy off if necessary

	; move stack to the top of RAM (TODO: detect and avoid Ext. BIOS data area)
	mov ax, (0xa0000 - STACKSZ) >> 4
	mov ss, ax
	mov sp, STACKSZ

	; zero .bss
	mov di, _bss_start_off
	mov cx, _bss_size
	shr cx, 1
	rep stosw
	xor ax, ax
	mov es, ax

	call kmain

hang:	hlt
	jmp hang

; vi:set ts=8 sts=8 sw=8 ft=nasm: