| 1 | /* $Id: bs3-cmn-MemAlloc.c 58814 2015-11-22 06:50:50Z 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) 2007-2015 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 | * Header Files *
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| 29 | *********************************************************************************************************************************/
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| 30 | #include "bs3kit-template-header.h"
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| 31 | #include "bs3-cmn-memory.h"
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| 32 | #include <iprt/asm.h>
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| 33 |
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| 34 |
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| 35 | BS3_DECL(void BS3_FAR *) Bs3MemAlloc(BS3MEMKIND enmKind, size_t cb)
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| 36 | {
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| 37 | void BS3_FAR *pvRet;
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| 38 | uint8_t idxSlabList = bs3MemSizeToSlabListIndex(cb);
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| 39 | if (idxSlabList < BS3_MEM_SLAB_LIST_COUNT)
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| 40 | {
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| 41 | /*
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| 42 | * Try allocate a chunk from the list.
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| 43 | */
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| 44 | PBS3SLABHEAD pHead = enmKind == BS3MEMKIND_REAL
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| 45 | ? &BS3_MSC64_FIXUP_HACK(BS3SLABHEAD, BS3_DATA_NM(g_aBs3LowSlabLists))[idxSlabList]
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| 46 | : &BS3_MSC64_FIXUP_HACK(BS3SLABHEAD, BS3_DATA_NM(g_aBs3UpperTiledSlabLists))[idxSlabList];
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| 47 |
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| 48 | BS3_ASSERT(BS3_MSC64_FIXUP_HACK(BS3SLABHEAD, BS3_DATA_NM(g_aBs3LowSlabLists))[idxSlabList].cbChunk >= cb);
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| 49 | pvRet = Bs3SlabListAlloc(pHead);
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| 50 | if (pvRet)
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| 51 | { /* likely */ }
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| 52 | else
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| 53 | {
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| 54 | /*
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| 55 | * Grow the list.
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| 56 | */
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| 57 | PBS3SLABCTL pNew = (PBS3SLABCTL)Bs3SlabAlloc( enmKind == BS3MEMKIND_REAL
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| 58 | ? &BS3_DATA_NM(g_Bs3Mem4KLow).Core
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| 59 | : &BS3_DATA_NM(g_Bs3Mem4KUpperTiled).Core);
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| 60 | BS3_ASSERT(((uintptr_t)pNew & 0xfff) == 0);
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| 61 | if (pNew)
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| 62 | {
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| 63 | uint16_t const cbHdr = BS3_DATA_NM(g_cbBs3SlabCtlSizesforLists)[idxSlabList];
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| 64 | BS3_XPTR_AUTO(void, pvNew);
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| 65 | BS3_XPTR_SET(void, pvNew, pNew);
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| 66 |
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| 67 | Bs3SlabInit(pNew, cbHdr, BS3_XPTR_GET_FLAT(void, pvNew) + cbHdr, _4K - cbHdr, pHead->cbChunk);
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| 68 | Bs3SlabListAdd(pHead, pNew);
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| 69 |
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| 70 | pvRet = Bs3SlabListAlloc(pHead);
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| 71 | }
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| 72 | }
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| 73 | }
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| 74 | else
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| 75 | {
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| 76 | /*
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| 77 | * Allocate one or more pages.
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| 78 | */
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| 79 | size_t const cbAligned = RT_ALIGN_Z(cb, _4K);
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| 80 | uint16_t const cPages = cbAligned >> 12 /* div _4K */;
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| 81 |
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| 82 | pvRet = Bs3SlabAllocEx(enmKind == BS3MEMKIND_REAL
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| 83 | ? &BS3_DATA_NM(g_Bs3Mem4KLow).Core : &BS3_DATA_NM(g_Bs3Mem4KUpperTiled).Core,
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| 84 | cPages,
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| 85 | cPages <= _64K / _4K ? BS3_SLAB_ALLOC_F_SAME_TILE : 0);
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| 86 | }
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| 87 | return pvRet;
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| 88 | }
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| 89 |
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