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/* $Id: bs3-cmn-SlabInit.c $ */
/** @file
* BS3Kit - Bs3SlabInit
*/
/*
* Copyright (C) 2007-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "bs3kit-template-header.h"
#include <iprt/asm.h>
#undef Bs3SlabInit
BS3_CMN_DEF(void, Bs3SlabInit,(PBS3SLABCTL pSlabCtl, size_t cbSlabCtl, uint32_t uFlatSlabPtr, uint32_t cbSlab, uint16_t cbChunk))
{
uint16_t cBits;
BS3_ASSERT(RT_IS_POWER_OF_TWO(cbChunk));
BS3_ASSERT(cbSlab >= cbChunk * 4);
BS3_ASSERT(!(uFlatSlabPtr & (cbChunk - 1)));
BS3_XPTR_SET_FLAT(BS3SLABCTL, pSlabCtl->pNext, 0);
BS3_XPTR_SET_FLAT(BS3SLABCTL, pSlabCtl->pHead, 0);
BS3_XPTR_SET_FLAT(BS3SLABCTL, pSlabCtl->pbStart, uFlatSlabPtr);
pSlabCtl->cbChunk = cbChunk;
pSlabCtl->cChunkShift = ASMBitFirstSetU16(cbChunk) - 1;
pSlabCtl->cChunks = cbSlab >> pSlabCtl->cChunkShift;
pSlabCtl->cFreeChunks = pSlabCtl->cChunks;
cBits = RT_ALIGN_T(pSlabCtl->cChunks, 32, uint16_t);
BS3_ASSERT(cbSlabCtl >= RT_UOFFSETOF_DYN(BS3SLABCTL, bmAllocated[cBits >> 3]));
Bs3MemZero(&pSlabCtl->bmAllocated, cBits >> 3);
/* Mark excess bitmap padding bits as allocated. */
if (cBits != pSlabCtl->cChunks)
{
uint16_t iBit;
for (iBit = pSlabCtl->cChunks; iBit < cBits; iBit++)
ASMBitSet(pSlabCtl->bmAllocated, iBit);
}
}
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