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%ifndef _BUILTIN_REBOOT_ASM
%define _BUILTIN_REBOOT_ASM
builtin_reboot:
mov bx, 3 ; number of seconds
.countdown:
push bx
push .msg_reboot_count
call printf
add sp, 2 * 2
mov ah, 86h
mov cx, 0fh
mov dx, 4240h
int 15h
dec bx
jne .countdown
push .msg_reboot
call printf
add sp, 2 * 1
jmp 0FFFFh:0000h ; issue reboot
.msg_reboot_count db 'rebooting in %d seconds...\r', 0
.msg_reboot db '\nreboot...\n', 0
; no return, and the stack is irrelevant here
%endif
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