1 files changed, 72 insertions, 0 deletions
diff --git a/src/VBox/VMM/VMMR3/MMPagePool.cpp b/src/VBox/VMM/VMMR3/MMPagePool.cpp
new file mode 100644
index 00000000..8566bdc9
--- /dev/null
+++ b/src/VBox/VMM/VMMR3/MMPagePool.cpp
@@ -0,0 +1,72 @@
+/* $Id: MMPagePool.cpp $ */
+/** @file
+ * MM - Memory Manager - Page Pool (what's left of it).
+ */
+
+/*
+ * Copyright (C) 2006-2020 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_MM_POOL
+#include <VBox/vmm/mm.h>
+#include "MMInternal.h"
+#include <VBox/vmm/vm.h>
+#include <iprt/errcore.h>
+#include <VBox/log.h>
+
+
+/**
+ * Gets the HC pointer to the dummy page.
+ *
+ * The dummy page is used as a place holder to prevent potential bugs
+ * from doing really bad things to the system.
+ *
+ * @returns Pointer to the dummy page.
+ * @param   pVM         The cross context VM structure.
+ * @thread  The Emulation Thread.
+ */
+VMMR3DECL(void *) MMR3PageDummyHCPtr(PVM pVM)
+{
+    VM_ASSERT_EMT(pVM);
+    if (!pVM->mm.s.pvDummyPage)
+    {
+        int rc = MMHyperAlloc(pVM, PAGE_SIZE, PAGE_SIZE, MM_TAG_PGM, &pVM->mm.s.pvDummyPage);
+        AssertRelease(RT_SUCCESS(rc));
+        AssertRelease(pVM->mm.s.pvDummyPage);
+        pVM->mm.s.HCPhysDummyPage = MMR3HyperHCVirt2HCPhys(pVM, pVM->mm.s.pvDummyPage);
+        AssertRelease(!(pVM->mm.s.HCPhysDummyPage & ~X86_PTE_PAE_PG_MASK));
+    }
+    return pVM->mm.s.pvDummyPage;
+}
+
+
+/**
+ * Gets the HC Phys to the dummy page.
+ *
+ * The dummy page is used as a place holder to prevent potential bugs
+ * from doing really bad things to the system.
+ *
+ * @returns Pointer to the dummy page.
+ * @param   pVM         The cross context VM structure.
+ * @thread  The Emulation Thread.
+ */
+VMMR3DECL(RTHCPHYS) MMR3PageDummyHCPhys(PVM pVM)
+{
+    VM_ASSERT_EMT(pVM);
+    if (!pVM->mm.s.pvDummyPage)
+        MMR3PageDummyHCPtr(pVM);
+    return pVM->mm.s.HCPhysDummyPage;
+}
+