1 files changed, 87 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-shutdown.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-shutdown.c
new file mode 100644
index 00000000..58b64ca3
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-shutdown.c
@@ -0,0 +1,87 @@
+/* $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;
+}
+