| 1 | /* $Id: MMPagePool.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * MM - Memory Manager - Page Pool (what's left of it).
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_MM_POOL
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| 23 | #include <VBox/vmm/mm.h>
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| 24 | #include "MMInternal.h"
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| 25 | #include <VBox/vmm/vm.h>
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| 26 | #include <iprt/errcore.h>
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| 27 | #include <VBox/log.h>
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| 28 |
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| 29 |
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| 30 | /**
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| 31 | * Gets the HC pointer to the dummy page.
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| 32 | *
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| 33 | * The dummy page is used as a place holder to prevent potential bugs
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| 34 | * from doing really bad things to the system.
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| 35 | *
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| 36 | * @returns Pointer to the dummy page.
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| 37 | * @param pVM The cross context VM structure.
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| 38 | * @thread The Emulation Thread.
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| 39 | */
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| 40 | VMMR3DECL(void *) MMR3PageDummyHCPtr(PVM pVM)
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| 41 | {
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| 42 | VM_ASSERT_EMT(pVM);
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| 43 | if (!pVM->mm.s.pvDummyPage)
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| 44 | {
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| 45 | int rc = MMHyperAlloc(pVM, PAGE_SIZE, PAGE_SIZE, MM_TAG_PGM, &pVM->mm.s.pvDummyPage);
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| 46 | AssertRelease(RT_SUCCESS(rc));
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| 47 | AssertRelease(pVM->mm.s.pvDummyPage);
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| 48 | pVM->mm.s.HCPhysDummyPage = MMR3HyperHCVirt2HCPhys(pVM, pVM->mm.s.pvDummyPage);
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| 49 | AssertRelease(!(pVM->mm.s.HCPhysDummyPage & ~X86_PTE_PAE_PG_MASK));
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| 50 | }
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| 51 | return pVM->mm.s.pvDummyPage;
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| 52 | }
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| 53 |
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| 54 |
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| 55 | /**
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| 56 | * Gets the HC Phys to the dummy page.
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| 57 | *
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| 58 | * The dummy page is used as a place holder to prevent potential bugs
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| 59 | * from doing really bad things to the system.
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| 60 | *
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| 61 | * @returns Pointer to the dummy page.
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| 62 | * @param pVM The cross context VM structure.
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| 63 | * @thread The Emulation Thread.
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| 64 | */
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| 65 | VMMR3DECL(RTHCPHYS) MMR3PageDummyHCPhys(PVM pVM)
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| 66 | {
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| 67 | VM_ASSERT_EMT(pVM);
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| 68 | if (!pVM->mm.s.pvDummyPage)
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| 69 | MMR3PageDummyHCPtr(pVM);
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| 70 | return pVM->mm.s.HCPhysDummyPage;
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| 71 | }
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| 72 |
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