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/* $Id: bs3-shutdown.c $ */
/** @file
* BS3Kit - Shutdown VM from PE16 - proof of concept (BS3Kit).
*/
/*
* Copyright (C) 2007-2023 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
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "bs3kit.h"
#include <iprt/assert.h>
#include <iprt/asm-amd64-x86.h>
AssertCompileSize(uint16_t, 2);
AssertCompileSize(uint32_t, 4);
AssertCompileSize(uint64_t, 8);
extern uint16_t ASMGetMsw();
#pragma aux ASMGetMsw = \
".286" \
"smsw ax" \
value [ax] \
modify exact;
extern void ASMSetMsw(uint16_t uMsw);
#pragma aux ASMSetMsw = \
".286p" \
"lmsw ax" \
parm [ax] \
modify exact;
/* Just a sample. */
BS3_DECL(void) Main_pe16(void)
{
uint16_t uMsw = ASMGetMsw();
Bs3Printf("msw=%#x cr0=%RX32 g_uBs3CpuDetected=%#x\n", uMsw, ASMGetCR0(), g_uBs3CpuDetected);
Bs3Printf("cr2=%RX32 cr3=%RX32\n", ASMGetCR2(), ASMGetCR3());
ASMSetMsw(X86_CR0_PE);
Bs3Printf("lmsw(PE) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
ASMSetMsw(UINT16_MAX);
Bs3Printf("lmsw(0xffff) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
ASMSetCR0(X86_CR0_PE);
Bs3Printf("ASMSetCR0(X86_CR0_PE) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
ASMSetCR0(UINT32_C(0x7fffffff));
Bs3Printf("ASMSetCR0(0x7fffffff) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
Bs3TestInit("bs3-shutdown");
Bs3TestPrintf("detected cpu: %#x\n", g_uBs3CpuDetected);
#if 1
ASMHalt();
#else
Bs3Shutdown();
#endif
return;
}
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