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/* $Id: bs3-cmn-MemAlloc.c $ */
/** @file
* BS3Kit - Bs3MemAlloc
*/
/*
* Copyright (C) 2007-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "bs3kit-template-header.h"
#include "bs3-cmn-memory.h"
#include <iprt/asm.h>
#undef Bs3MemAlloc
BS3_CMN_DEF(void BS3_FAR *, Bs3MemAlloc,(BS3MEMKIND enmKind, size_t cb))
{
void BS3_FAR *pvRet;
uint8_t idxSlabList;
#if ARCH_BITS == 16
/* Don't try allocate memory which address we cannot return. */
if ( enmKind != BS3MEMKIND_REAL
&& BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode))
enmKind = BS3MEMKIND_REAL;
#endif
idxSlabList = bs3MemSizeToSlabListIndex(cb);
if (idxSlabList < BS3_MEM_SLAB_LIST_COUNT)
{
/*
* Try allocate a chunk from the list.
*/
PBS3SLABHEAD pHead = enmKind == BS3MEMKIND_REAL
? &g_aBs3LowSlabLists[idxSlabList]
: &g_aBs3UpperTiledSlabLists[idxSlabList];
BS3_ASSERT(g_aBs3LowSlabLists[idxSlabList].cbChunk >= cb);
pvRet = Bs3SlabListAlloc(pHead);
if (pvRet)
{ /* likely */ }
else
{
/*
* Grow the list.
*/
PBS3SLABCTL pNew = (PBS3SLABCTL)Bs3SlabAlloc( enmKind == BS3MEMKIND_REAL
? &g_Bs3Mem4KLow.Core
: &g_Bs3Mem4KUpperTiled.Core);
BS3_ASSERT(((uintptr_t)pNew & 0xfff) == 0);
if (pNew)
{
uint16_t const cbHdr = g_cbBs3SlabCtlSizesforLists[idxSlabList];
BS3_XPTR_AUTO(void, pvNew);
BS3_XPTR_SET(void, pvNew, pNew);
Bs3SlabInit(pNew, cbHdr, BS3_XPTR_GET_FLAT(void, pvNew) + cbHdr, _4K - cbHdr, pHead->cbChunk);
Bs3SlabListAdd(pHead, pNew);
pvRet = Bs3SlabListAlloc(pHead);
}
}
}
else
{
/*
* Allocate one or more pages.
*/
size_t const cbAligned = RT_ALIGN_Z(cb, _4K);
uint16_t const cPages = cbAligned >> 12 /* div _4K */;
PBS3SLABCTL pSlabCtl = enmKind == BS3MEMKIND_REAL
? &g_Bs3Mem4KLow.Core : &g_Bs3Mem4KUpperTiled.Core;
pvRet = Bs3SlabAllocEx(pSlabCtl,
cPages,
cPages <= _64K / _4K ? BS3_SLAB_ALLOC_F_SAME_TILE : 0);
}
return pvRet;
}
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