| 1 | /* $Id: bs3-cmn-SlabInit.c 58789 2015-11-20 03:38:25Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3SlabInit
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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 | #include "bs3kit-template-header.h"
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| 28 | #include <iprt/asm.h>
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| 29 |
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| 30 |
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| 31 | BS3_DECL(void) Bs3SlabInit(PBS3SLABCTL pSlabCtl, size_t cbSlabCtl, uint32_t uFlatSlabPtr, uint32_t cbSlab, uint16_t cbChunk)
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| 32 | {
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| 33 | uint16_t cBits;
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| 34 | BS3_ASSERT(RT_IS_POWER_OF_TWO(cbChunk));
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| 35 | BS3_ASSERT(cbSlab >= cbChunk * 4);
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| 36 | BS3_ASSERT(!(uFlatSlabPtr & (cbChunk - 1)));
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| 37 |
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| 38 | BS3_XPTR_SET_FLAT(BS3SLABCTL, pSlabCtl->pNext, 0);
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| 39 | BS3_XPTR_SET_FLAT(BS3SLABCTL, pSlabCtl->pHead, 0);
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| 40 | BS3_XPTR_SET_FLAT(BS3SLABCTL, pSlabCtl->pbStart, uFlatSlabPtr);
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| 41 | pSlabCtl->cbChunk = cbChunk;
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| 42 | pSlabCtl->cChunkShift = ASMBitFirstSetU16(cbChunk) - 1;
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| 43 | pSlabCtl->cChunks = cbSlab >> pSlabCtl->cChunkShift;
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| 44 | pSlabCtl->cFreeChunks = pSlabCtl->cChunks;
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| 45 | cBits = RT_ALIGN_T(pSlabCtl->cChunks, 32, uint16_t);
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| 46 | BS3_ASSERT(cbSlabCtl >= RT_OFFSETOF(BS3SLABCTL, bmAllocated[cBits >> 3]));
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| 47 | Bs3MemZero(&pSlabCtl->bmAllocated, cBits >> 3);
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| 48 |
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| 49 | /* Mark excess bitmap padding bits as allocated. */
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| 50 | if (cBits != pSlabCtl->cChunks)
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| 51 | {
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| 52 | uint16_t iBit;
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| 53 | for (iBit = pSlabCtl->cChunks; iBit < cBits; iBit++)
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| 54 | ASMBitSet(pSlabCtl->bmAllocated, iBit);
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| 55 | }
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| 56 | }
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| 57 |
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