| 1 | /* $Id: bs3-cmn-SlabFree.c 58777 2015-11-19 17:20:00Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * BS3Kit - Bs3SlabFree
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2007-2015 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 | #include "bs3kit-template-header.h"
|
|---|
| 28 | #include <iprt/asm.h>
|
|---|
| 29 |
|
|---|
| 30 |
|
|---|
| 31 | BS3_DECL(uint16_t) Bs3SlabFree(PBS3SLABCLT pSlabCtl, uint32_t uFlatChunkPtr, uint16_t cChunks)
|
|---|
| 32 | {
|
|---|
| 33 | uint16_t cFreed = 0;
|
|---|
| 34 | BS3_ASSERT(cChunks > 0);
|
|---|
| 35 | if (cChunks > 0)
|
|---|
| 36 | {
|
|---|
| 37 | uint16_t iChunk = (uint16_t)((uFlatChunkPtr - BS3_XPTR_GET_FLAT(uint8_t, pSlabCtl->pbStart)) >> pSlabCtl->cChunkShift);
|
|---|
| 38 | BS3_ASSERT(iChunk < pSlabCtl->cChunks);
|
|---|
| 39 | BS3_ASSERT(iChunk + cChunks <= pSlabCtl->cChunks);
|
|---|
| 40 |
|
|---|
| 41 | do
|
|---|
| 42 | {
|
|---|
| 43 | if (ASMBitTestAndClear(&pSlabCtl->bmAllocated, iChunk))
|
|---|
| 44 | cFreed++;
|
|---|
| 45 | else
|
|---|
| 46 | BS3_ASSERT(0);
|
|---|
| 47 | iChunk++;
|
|---|
| 48 | } while (--cChunks > 0);
|
|---|
| 49 |
|
|---|
| 50 | pSlabCtl->cFreeChunks += cFreed;
|
|---|
| 51 | }
|
|---|
| 52 | return cFreed;
|
|---|
| 53 | }
|
|---|
| 54 |
|
|---|
