VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/win/allocex-win.cpp@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

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1/* $Id: allocex-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - Memory Allocation, Extended Alloc Workers, Windows.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#define RTMEM_NO_WRAP_TO_EF_APIS
42#include <iprt/mem.h>
43#include "internal/iprt.h"
44
45#include <iprt/assert.h>
46#include <iprt/errcore.h>
47#include <iprt/string.h>
48#include <iprt/param.h>
49#include "../allocex.h"
50
51#include <iprt/win/windows.h>
52
53
54static int rtMemAllocExInRange(size_t cbAlloc, uint32_t fFlags, void **ppv, uintptr_t uAddr, uintptr_t uAddrLast)
55{
56 /*
57 * Try with every possible address hint since the possible range is very limited.
58 */
59 DWORD fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
60 while (uAddr <= uAddrLast)
61 {
62 MEMORY_BASIC_INFORMATION MemInfo;
63 SIZE_T cbRange = VirtualQuery((void *)uAddr, &MemInfo, sizeof(MemInfo));
64 AssertReturn(cbRange == sizeof(MemInfo), VERR_NOT_SUPPORTED);
65 Assert(MemInfo.RegionSize > 0);
66
67 if ( MemInfo.State == MEM_FREE
68 && MemInfo.RegionSize >= cbAlloc)
69 {
70 void *pv = VirtualAlloc((void *)uAddr, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
71 if ((uintptr_t)pv == uAddr)
72 {
73 *ppv = pv;
74 return VINF_SUCCESS;
75 }
76 AssertStmt(!pv, VirtualFree(pv, cbAlloc, MEM_RELEASE));
77 }
78
79 /* skip ahead */
80 uintptr_t uAddrNext = (uintptr_t)MemInfo.BaseAddress + MemInfo.RegionSize;
81 if (uAddrNext <= uAddr)
82 break;
83 uAddr += uAddrNext;
84 }
85
86 return VERR_NO_MEMORY;
87}
88
89
90DECLHIDDEN(int) rtMemAllocEx16BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
91{
92 cbAlloc = RT_ALIGN_Z(cbAlloc, PAGE_SIZE);
93 AssertReturn(cbAlloc <= _64K - PAGE_SIZE, VERR_NO_MEMORY);
94
95 /* Seems this doesn't work on W7/64... */
96 return rtMemAllocExInRange(cbAlloc, fFlags, ppv, PAGE_SIZE, _64K - cbAlloc);
97}
98
99
100DECLHIDDEN(int) rtMemAllocEx32BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
101{
102 cbAlloc = RT_ALIGN_Z(cbAlloc, PAGE_SIZE);
103 AssertReturn(cbAlloc <= _2G+_1G, VERR_NO_MEMORY);
104
105 /*
106 * Just try first.
107 */
108 DWORD fPageProt = (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
109 void *pv = VirtualAlloc(NULL, cbAlloc, MEM_RESERVE | MEM_COMMIT, fPageProt);
110 if (!pv)
111 return VERR_NO_MEMORY;
112 if ((uintptr_t)pv + cbAlloc - 1 < _4G)
113 {
114 *ppv = pv;
115 return VINF_SUCCESS;
116 }
117 VirtualFree(pv, cbAlloc, MEM_RELEASE);
118
119 /*
120 * No luck, do address scan based allocation.
121 */
122 return rtMemAllocExInRange(cbAlloc, fFlags, ppv, _64K, _4G - cbAlloc);
123}
124
125
126DECLHIDDEN(void) rtMemFreeExYyBitReach(void *pv, size_t cb, uint32_t fFlags)
127{
128 RT_NOREF_PV(fFlags);
129
130 BOOL fRc = VirtualFree(pv, cb, MEM_RELEASE);
131 Assert(fRc); RT_NOREF_PV(fRc);
132}
133
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