| 1 | /* $Id: bs3-cmn-MemAlloc.c 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3MemAlloc
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2023 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 | #include "bs3kit-template-header.h"
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| 42 | #include "bs3-cmn-memory.h"
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| 43 | #include <iprt/asm.h>
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| 44 |
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| 45 |
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| 46 | #undef Bs3MemAlloc
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| 47 | BS3_CMN_DEF(void BS3_FAR *, Bs3MemAlloc,(BS3MEMKIND enmKind, size_t cb))
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| 48 | {
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| 49 | void BS3_FAR *pvRet;
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| 50 | uint8_t idxSlabList;
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| 51 |
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| 52 | #if ARCH_BITS == 16
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| 53 | /* Don't try allocate memory which address we cannot return. */
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| 54 | if ( enmKind != BS3MEMKIND_REAL
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| 55 | && BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode))
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| 56 | enmKind = BS3MEMKIND_REAL;
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| 57 | #endif
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| 58 |
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| 59 | idxSlabList = bs3MemSizeToSlabListIndex(cb);
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| 60 | if (idxSlabList < BS3_MEM_SLAB_LIST_COUNT)
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| 61 | {
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| 62 | /*
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| 63 | * Try allocate a chunk from the list.
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| 64 | */
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| 65 | PBS3SLABHEAD pHead = enmKind == BS3MEMKIND_REAL
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| 66 | ? &g_aBs3LowSlabLists[idxSlabList]
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| 67 | : &g_aBs3UpperTiledSlabLists[idxSlabList];
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| 68 |
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| 69 | BS3_ASSERT(g_aBs3LowSlabLists[idxSlabList].cbChunk >= cb);
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| 70 | pvRet = Bs3SlabListAlloc(pHead);
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| 71 | if (pvRet)
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| 72 | { /* likely */ }
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| 73 | else
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| 74 | {
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| 75 | /*
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| 76 | * Grow the list.
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| 77 | */
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| 78 | PBS3SLABCTL pNew = (PBS3SLABCTL)Bs3SlabAlloc( enmKind == BS3MEMKIND_REAL
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| 79 | ? &g_Bs3Mem4KLow.Core
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| 80 | : &g_Bs3Mem4KUpperTiled.Core);
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| 81 | BS3_ASSERT(((uintptr_t)pNew & 0xfff) == 0);
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| 82 | if (pNew)
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| 83 | {
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| 84 | uint16_t const cbHdr = g_cbBs3SlabCtlSizesforLists[idxSlabList];
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| 85 | BS3_XPTR_AUTO(void, pvNew);
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| 86 | BS3_XPTR_SET(void, pvNew, pNew);
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| 87 |
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| 88 | Bs3SlabInit(pNew, cbHdr, BS3_XPTR_GET_FLAT(void, pvNew) + cbHdr, _4K - cbHdr, pHead->cbChunk);
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| 89 | Bs3SlabListAdd(pHead, pNew);
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| 90 |
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| 91 | pvRet = Bs3SlabListAlloc(pHead);
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| 92 | }
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| 93 | }
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| 94 | }
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| 95 | else
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| 96 | {
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| 97 | /*
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| 98 | * Allocate one or more pages.
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| 99 | */
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| 100 | size_t const cbAligned = RT_ALIGN_Z(cb, _4K);
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| 101 | uint16_t const cPages = cbAligned >> 12 /* div _4K */;
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| 102 | PBS3SLABCTL pSlabCtl = enmKind == BS3MEMKIND_REAL
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| 103 | ? &g_Bs3Mem4KLow.Core : &g_Bs3Mem4KUpperTiled.Core;
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| 104 |
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| 105 | pvRet = Bs3SlabAllocEx(pSlabCtl,
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| 106 | cPages,
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| 107 | cPages <= _64K / _4K ? BS3_SLAB_ALLOC_F_SAME_TILE : 0);
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| 108 | }
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| 109 | return pvRet;
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| 110 | }
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| 111 |
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