#define SHUTDOWN_PORT 0x8900

	.text
	.globl _start
_start:
base:	
	.code16
	jmp cont

portmsg:
	xorw %ax, %ax
1:	
	movb 0(%si), %al
	test %ax, %ax
	jz 1f
	outb %al, %dx
	incw %si
	jmp 1b
1:
	ret

serialmsg:	
1:	
	movb 0(%si), %bl
	testb %bl, %bl
	jz 1f
	movw $0x3fd, %dx
2:	
	inb %dx, %al
	testb $0x20, %al
	jz   2b

	movw $0x3f8, %dx
	movb %bl, %al
	outb %al, %dx
	incw %si
	jmp 1b
1:
	ret

cont:	
	xorw %ax, %ax
	movw %ax, %ds
	lea message, %si
	call serialmsg
	lea shutdown, %si
	movw $SHUTDOWN_PORT, %dx
	call portmsg

1:
	hlt
	jmp 1b

shutdown:
	.ascii "Shutdown"
	.byte 0
message:
	.ascii "Boot Test Passed Successfully\n" SUCCESSFUL_BOOT_STRING "\n"
	.byte 0

	. = base + 510
	.short 0xaa55