From 47e691cb0b7a49a797c622b6c79162428358fbe1 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Tue, 19 Jun 2018 00:54:43 -0400
Subject: Implement builtin terminal commands * Reboot * Exit * Echo

---
 builtin_reboot.asm | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 builtin_reboot.asm

(limited to 'builtin_reboot.asm')

diff --git a/builtin_reboot.asm b/builtin_reboot.asm
new file mode 100644
index 0000000..54d6f8a
--- /dev/null
+++ b/builtin_reboot.asm
@@ -0,0 +1,29 @@
+%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
-- 
cgit