VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-SlabAlloc.c@ 66485

Last change on this file since 66485 was 62484, checked in by vboxsync, 8 years ago

(C) 2016

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.1 KB
Line 
1/* $Id: bs3-cmn-SlabAlloc.c 62484 2016-07-22 18:35:33Z vboxsync $ */
2/** @file
3 * BS3Kit - Bs3SlabAlloc
4 */
5
6/*
7 * Copyright (C) 2007-2016 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#include "bs3kit-template-header.h"
32#include <iprt/asm.h>
33
34
35#undef Bs3SlabAlloc
36BS3_CMN_DEF(void BS3_FAR *, Bs3SlabAlloc,(PBS3SLABCTL pSlabCtl))
37{
38 if (pSlabCtl->cFreeChunks)
39 {
40 int32_t iBit = ASMBitFirstClear(&pSlabCtl->bmAllocated, pSlabCtl->cChunks);
41 if (iBit >= 0)
42 {
43 BS3_XPTR_AUTO(void, pvRet);
44 ASMBitSet(&pSlabCtl->bmAllocated, iBit);
45 pSlabCtl->cFreeChunks -= 1;
46
47 BS3_XPTR_SET_FLAT(void, pvRet,
48 BS3_XPTR_GET_FLAT(uint8_t, pSlabCtl->pbStart) + ((uint32_t)iBit << pSlabCtl->cChunkShift));
49 return BS3_XPTR_GET(void, pvRet);
50 }
51 }
52 return NULL;
53}
54
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