1 | /* $Id: allocex-win.cpp 98103 2023-01-17 14:15:46Z 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) 2006-2023 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 | #define RTMEM_NO_WRAP_TO_EF_APIS
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42 | #include <iprt/mem.h>
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43 | #include "internal/iprt.h"
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44 |
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45 | #include <iprt/assert.h>
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46 | #include <iprt/errcore.h>
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47 | #include <iprt/string.h>
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48 | #include <iprt/param.h>
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49 | #include "../allocex.h"
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50 |
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51 | #include <iprt/win/windows.h>
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52 |
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53 |
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54 | static int rtMemAllocExInRange(size_t cbAlloc, uint32_t fFlags, void **ppv, uintptr_t uAddr, uintptr_t uAddrLast)
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55 | {
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56 | /*
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57 | * Try with every possible address hint since the possible range is very limited.
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58 | */
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59 | DWORD fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
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60 | while (uAddr <= uAddrLast)
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61 | {
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62 | MEMORY_BASIC_INFORMATION MemInfo;
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63 | SIZE_T cbRange = VirtualQuery((void *)uAddr, &MemInfo, sizeof(MemInfo));
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64 | AssertReturn(cbRange == sizeof(MemInfo), VERR_NOT_SUPPORTED);
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65 | Assert(MemInfo.RegionSize > 0);
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66 |
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67 | if ( MemInfo.State == MEM_FREE
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68 | && MemInfo.RegionSize >= cbAlloc)
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69 | {
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70 | void *pv = VirtualAlloc((void *)uAddr, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
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71 | if ((uintptr_t)pv == uAddr)
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72 | {
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73 | *ppv = pv;
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74 | return VINF_SUCCESS;
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75 | }
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76 | AssertStmt(!pv, VirtualFree(pv, cbAlloc, MEM_RELEASE));
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77 | }
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78 |
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79 | /* skip ahead */
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80 | uintptr_t uAddrNext = (uintptr_t)MemInfo.BaseAddress + MemInfo.RegionSize;
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81 | if (uAddrNext <= uAddr)
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82 | break;
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83 | uAddr += uAddrNext;
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84 | }
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85 |
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86 | return VERR_NO_MEMORY;
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87 | }
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88 |
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89 |
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90 | DECLHIDDEN(int) rtMemAllocEx16BitReach(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 <= _64K - PAGE_SIZE, VERR_NO_MEMORY);
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94 |
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95 | /* Seems this doesn't work on W7/64... */
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96 | return rtMemAllocExInRange(cbAlloc, fFlags, ppv, PAGE_SIZE, _64K - cbAlloc);
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97 | }
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98 |
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99 |
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100 | DECLHIDDEN(int) rtMemAllocEx32BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
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101 | {
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102 | cbAlloc = RT_ALIGN_Z(cbAlloc, PAGE_SIZE);
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103 | AssertReturn(cbAlloc <= _2G+_1G, VERR_NO_MEMORY);
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104 |
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105 | /*
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106 | * Just try first.
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107 | */
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108 | DWORD fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
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109 | void *pv = VirtualAlloc(NULL, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
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110 | if (!pv)
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111 | return VERR_NO_MEMORY;
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112 | if ((uintptr_t)pv + cbAlloc - 1 < _4G)
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113 | {
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114 | *ppv = pv;
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115 | return VINF_SUCCESS;
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116 | }
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117 | VirtualFree(pv, cbAlloc, MEM_RELEASE);
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118 |
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119 | /*
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120 | * No luck, do address scan based allocation.
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121 | */
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122 | return rtMemAllocExInRange(cbAlloc, fFlags, ppv, _64K, _4G - cbAlloc);
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123 | }
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124 |
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125 |
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126 | DECLHIDDEN(void) rtMemFreeExYyBitReach(void *pv, size_t cb, uint32_t fFlags)
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127 | {
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128 | RT_NOREF_PV(fFlags);
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129 |
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130 | BOOL fRc = VirtualFree(pv, cb, MEM_RELEASE);
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131 | Assert(fRc); RT_NOREF_PV(fRc);
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132 | }
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133 |
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