VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bootsector-shutdown.asm@ 90780

Last change on this file since 90780 was 82968, checked in by vboxsync, 5 years ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.0 KB
Line 
1; $Id: bootsector-shutdown.asm 82968 2020-02-04 10:35:17Z vboxsync $
2;; @file
3; Bootsector for grub chainloading that shutdowns the VM.
4;
5
6;
7; Copyright (C) 2007-2020 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27%include "VBox/bios.mac"
28
29
30BITS 16
31start:
32 ; Start with a jump just to follow the convention.
33 jmp short the_code
34 nop
35times 3ah db 0
36
37the_code:
38 cli
39
40 ;
41 ; VBox/Bochs shutdown request - write "Shutdown" byte by byte to shutdown port.
42 ;
43 mov cx, 64
44 mov dx, VBOX_BIOS_SHUTDOWN_PORT
45 mov bx, VBOX_BIOS_OLD_SHUTDOWN_PORT
46retry:
47 mov al, 'S'
48 out dx, al
49 mov al, 'h'
50 out dx, al
51 mov al, 'u'
52 out dx, al
53 mov al, 't'
54 out dx, al
55 mov al, 'd'
56 out dx, al
57 mov al, 'o'
58 out dx, al
59 mov al, 'w'
60 out dx, al
61 mov al, 'n'
62 out dx, al
63 xchg dx, bx ; alternate between the new (VBox) and old (Bochs) ports.
64 loop retry
65
66 ;
67 ; Shutdown failed!
68 ;
69
70 ;; @todo print some message before halting.
71 hlt
72
73 ;
74 ; Padd the remainder of the sector with zeros and
75 ; end it with the dos signature.
76 ;
77padding:
78times 510 - (padding - start) db 0
79 db 055h, 0aah
80
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