| 1 | /* $Id: allocex-win.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Memory Allocation, Extended Alloc Workers, Windows.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 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 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define RTMEM_NO_WRAP_TO_EF_APIS
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| 32 | #include <iprt/mem.h>
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| 33 | #include "internal/iprt.h"
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| 34 |
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/errcore.h>
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| 37 | #include <iprt/string.h>
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| 38 | #include <iprt/param.h>
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| 39 | #include "../allocex.h"
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| 40 |
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| 41 | #include <iprt/win/windows.h>
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| 42 |
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| 43 |
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| 44 | static int rtMemAllocExInRange(size_t cbAlloc, uint32_t fFlags, void **ppv, uintptr_t uAddr, uintptr_t uAddrLast)
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| 45 | {
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| 46 | /*
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| 47 | * Try with every possible address hint since the possible range is very limited.
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| 48 | */
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| 49 | DWORD fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
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| 50 | while (uAddr <= uAddrLast)
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| 51 | {
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| 52 | MEMORY_BASIC_INFORMATION MemInfo;
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| 53 | SIZE_T cbRange = VirtualQuery((void *)uAddr, &MemInfo, sizeof(MemInfo));
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| 54 | AssertReturn(cbRange == sizeof(MemInfo), VERR_NOT_SUPPORTED);
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| 55 | Assert(MemInfo.RegionSize > 0);
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| 56 |
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| 57 | if ( MemInfo.State == MEM_FREE
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| 58 | && MemInfo.RegionSize >= cbAlloc)
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| 59 | {
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| 60 | void *pv = VirtualAlloc((void *)uAddr, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
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| 61 | if ((uintptr_t)pv == uAddr)
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| 62 | {
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| 63 | *ppv = pv;
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| 64 | return VINF_SUCCESS;
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| 65 | }
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| 66 | AssertStmt(!pv, VirtualFree(pv, cbAlloc, MEM_RELEASE));
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| 67 | }
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| 68 |
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| 69 | /* skip ahead */
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| 70 | uintptr_t uAddrNext = (uintptr_t)MemInfo.BaseAddress + MemInfo.RegionSize;
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| 71 | if (uAddrNext <= uAddr)
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| 72 | break;
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| 73 | uAddr += uAddrNext;
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| 74 | }
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| 75 |
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| 76 | return VERR_NO_MEMORY;
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| 77 | }
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| 78 |
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| 79 |
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| 80 | DECLHIDDEN(int) rtMemAllocEx16BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
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| 81 | {
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| 82 | cbAlloc = RT_ALIGN_Z(cbAlloc, PAGE_SIZE);
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| 83 | AssertReturn(cbAlloc <= _64K - PAGE_SIZE, VERR_NO_MEMORY);
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| 84 |
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| 85 | /* Seems this doesn't work on W7/64... */
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| 86 | return rtMemAllocExInRange(cbAlloc, fFlags, ppv, PAGE_SIZE, _64K - cbAlloc);
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| 87 | }
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| 88 |
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| 89 |
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| 90 | DECLHIDDEN(int) rtMemAllocEx32BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
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| 91 | {
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| 92 | cbAlloc = RT_ALIGN_Z(cbAlloc, PAGE_SIZE);
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| 93 | AssertReturn(cbAlloc <= _2G+_1G, VERR_NO_MEMORY);
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| 94 |
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| 95 | /*
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| 96 | * Just try first.
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| 97 | */
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| 98 | DWORD fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
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| 99 | void *pv = VirtualAlloc(NULL, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
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| 100 | if (!pv)
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| 101 | return VERR_NO_MEMORY;
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| 102 | if ((uintptr_t)pv + cbAlloc - 1 < _4G)
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| 103 | {
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| 104 | *ppv = pv;
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| 105 | return VINF_SUCCESS;
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| 106 | }
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| 107 | VirtualFree(pv, cbAlloc, MEM_RELEASE);
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| 108 |
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| 109 | /*
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| 110 | * No luck, do address scan based allocation.
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| 111 | */
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| 112 | return rtMemAllocExInRange(cbAlloc, fFlags, ppv, _64K, _4G - cbAlloc);
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| 113 | }
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| 114 |
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| 115 |
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| 116 | DECLHIDDEN(void) rtMemFreeExYyBitReach(void *pv, size_t cb, uint32_t fFlags)
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| 117 | {
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| 118 | RT_NOREF_PV(fFlags);
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| 119 |
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| 120 | BOOL fRc = VirtualFree(pv, cb, MEM_RELEASE);
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| 121 | Assert(fRc); RT_NOREF_PV(fRc);
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| 122 | }
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| 123 |
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