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/* $Id: bs3-cmn-SlabAlloc.c $ */
/** @file
* BS3Kit - Bs3SlabAlloc
*/
/*
* 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 Bs3SlabAlloc
BS3_CMN_DEF(void BS3_FAR *, Bs3SlabAlloc,(PBS3SLABCTL pSlabCtl))
{
if (pSlabCtl->cFreeChunks)
{
int32_t iBit = ASMBitFirstClear(&pSlabCtl->bmAllocated, pSlabCtl->cChunks);
if (iBit >= 0)
{
BS3_XPTR_AUTO(void, pvRet);
ASMBitSet(&pSlabCtl->bmAllocated, iBit);
pSlabCtl->cFreeChunks -= 1;
BS3_XPTR_SET_FLAT(void, pvRet,
BS3_XPTR_GET_FLAT(uint8_t, pSlabCtl->pbStart) + ((uint32_t)iBit << pSlabCtl->cChunkShift));
return BS3_XPTR_GET(void, pvRet);
}
}
return NULL;
}
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