diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bootsector-shutdown.asm')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bootsector-shutdown.asm | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bootsector-shutdown.asm b/src/VBox/ValidationKit/bootsectors/bootsector-shutdown.asm new file mode 100644 index 00000000..75ec8291 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bootsector-shutdown.asm @@ -0,0 +1,80 @@ +; $Id: bootsector-shutdown.asm $ +;; @file +; Bootsector for grub chainloading that shutdowns the VM. +; + +; +; Copyright (C) 2007-2019 Oracle Corporation +; +; This file is part of VirtualBox Open Source Edition (OSE), as +; available from http://www.virtualbox.org. This file is free software; +; you can redistribute it and/or modify it under the terms of the GNU +; General Public License (GPL) as published by the Free Software +; Foundation, in version 2 as it comes in the "COPYING" file of the +; VirtualBox OSE distribution. VirtualBox OSE is distributed in the +; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. +; +; The contents of this file may alternatively be used under the terms +; of the Common Development and Distribution License Version 1.0 +; (CDDL) only, as it comes in the "COPYING.CDDL" file of the +; VirtualBox OSE 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. +; + +%include "VBox/bios.mac" + + +BITS 16 +start: + ; Start with a jump just to follow the convention. + jmp short the_code + nop +times 3ah db 0 + +the_code: + cli + + ; + ; VBox/Bochs shutdown request - write "Shutdown" byte by byte to shutdown port. + ; + mov cx, 64 + mov dx, VBOX_BIOS_SHUTDOWN_PORT + mov bx, VBOX_BIOS_OLD_SHUTDOWN_PORT +retry: + mov al, 'S' + out dx, al + mov al, 'h' + out dx, al + mov al, 'u' + out dx, al + mov al, 't' + out dx, al + mov al, 'd' + out dx, al + mov al, 'o' + out dx, al + mov al, 'w' + out dx, al + mov al, 'n' + out dx, al + xchg dx, bx ; alternate between the new (VBox) and old (Bochs) ports. + loop retry + + ; + ; Shutdown failed! + ; + + ;; @todo print some message before halting. + hlt + + ; + ; Padd the remainder of the sector with zeros and + ; end it with the dos signature. + ; +padding: +times 510 - (padding - start) db 0 + db 055h, 0aah + |