1 files changed, 79 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/utils/dos/DosVmOff.asm b/src/VBox/ValidationKit/utils/dos/DosVmOff.asm
new file mode 100644
index 00000000..1958f9ce
--- /dev/null
+++ b/src/VBox/ValidationKit/utils/dos/DosVmOff.asm
@@ -0,0 +1,79 @@
+; $Id: DosVmOff.asm $
+;; @file
+; 16-bit DOS COM program that powers off the VM.
+;
+; Build: yasm -f bin -i../../../../../include/ DosVmOff.asm -o DosVmOff.com
+;
+
+;
+; Copyright (C) 2018-2023 Oracle and/or its affiliates.
+;
+; This file is part of VirtualBox base platform packages, as
+; available from https://www.virtualbox.org.
+;
+; This program is free software; you can redistribute it and/or
+; modify it under the terms of the GNU General Public License
+; as published by the Free Software Foundation, in version 3 of the
+; License.
+;
+; This program is distributed in the hope that it will be useful, but
+; WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+; General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with this program; if not, see <https://www.gnu.org/licenses>.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+; in the VirtualBox distribution, in which case the provisions of the
+; CDDL are applicable instead of those of the GPL.
+;
+; You may elect to license modified versions of this file under the
+; terms and conditions of either the GPL or the CDDL or both.
+;
+; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+;
+
+
+
+%include "VBox/bios.mac"
+
+        org 100h
+
+segment text
+main:
+%if 0
+        ; Setup stack.
+        mov     ax, stack
+        mov     ss, ax
+        mov     sp, top_of_stack
+%endif
+
+        ; Do the shutdown thing.
+        mov     ax, cs
+        mov     ds, ax
+
+        mov     bl, 64
+        mov     dx, VBOX_BIOS_SHUTDOWN_PORT
+        mov     ax, VBOX_BIOS_OLD_SHUTDOWN_PORT
+.retry:
+        mov     cx, 8
+        mov     si, .s_szShutdown
+        rep outsb
+        xchg    ax, dx                  ; alternate between the new (VBox) and old (Bochs) ports.
+        dec     bl
+        jnz     .retry
+
+
+        ; Probably not a VBox VM, exit the program with errorlevel 1.
+.whatever:
+        mov     ax, 04c01h
+        int     021h
+        hlt
+        jmp     .whatever
+
+.s_szShutdown:
+        db      'Shutdown', 0
+