| 1 | /* $Id: bs3-shutdown.c 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Shutdown VM from PE16 - proof of concept (BS3Kit).
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include "bs3kit.h"
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| 42 | #include <iprt/assert.h>
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| 43 | #include <iprt/asm-amd64-x86.h>
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| 44 |
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| 45 | AssertCompileSize(uint16_t, 2);
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| 46 | AssertCompileSize(uint32_t, 4);
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| 47 | AssertCompileSize(uint64_t, 8);
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| 48 |
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| 49 | extern uint16_t ASMGetMsw();
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| 50 | #pragma aux ASMGetMsw = \
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| 51 | ".286" \
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| 52 | "smsw ax" \
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| 53 | value [ax] \
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| 54 | modify exact;
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| 55 |
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| 56 | extern void ASMSetMsw(uint16_t uMsw);
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| 57 | #pragma aux ASMSetMsw = \
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| 58 | ".286p" \
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| 59 | "lmsw ax" \
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| 60 | parm [ax] \
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| 61 | modify exact;
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| 62 |
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| 63 | /* Just a sample. */
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| 64 | BS3_DECL(void) Main_pe16(void)
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| 65 | {
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| 66 | uint16_t uMsw = ASMGetMsw();
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| 67 | Bs3Printf("msw=%#x cr0=%RX32 g_uBs3CpuDetected=%#x\n", uMsw, ASMGetCR0(), g_uBs3CpuDetected);
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| 68 | Bs3Printf("cr2=%RX32 cr3=%RX32\n", ASMGetCR2(), ASMGetCR3());
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| 69 | ASMSetMsw(X86_CR0_PE);
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| 70 | Bs3Printf("lmsw(PE) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
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| 71 | ASMSetMsw(UINT16_MAX);
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| 72 | Bs3Printf("lmsw(0xffff) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
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| 73 | ASMSetCR0(X86_CR0_PE);
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| 74 | Bs3Printf("ASMSetCR0(X86_CR0_PE) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
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| 75 | ASMSetCR0(UINT32_C(0x7fffffff));
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| 76 | Bs3Printf("ASMSetCR0(0x7fffffff) => msw=%#x cr0=%RX32\n", ASMGetMsw(), ASMGetCR0());
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| 77 |
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| 78 | Bs3TestInit("bs3-shutdown");
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| 79 | Bs3TestPrintf("detected cpu: %#x\n", g_uBs3CpuDetected);
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| 80 | #if 1
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| 81 | ASMHalt();
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| 82 | #else
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| 83 | Bs3Shutdown();
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| 84 | #endif
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| 85 | return;
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| 86 | }
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| 87 |
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