alloc-r0drv.cpp revision 677833bc953b6cb418c701facbdcf4aa18d6c44e
/* $Id$ */
/** @file
* InnoTek Portable Runtime - Memory Allocation, Ring-0 Driver.
*/
/*
* Copyright (C) 2006 InnoTek Systemberatung GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License 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.
*
* If you received this file as part of a commercial VirtualBox
* distribution, then only the terms of your commercial VirtualBox
* license agreement apply instead of the previous paragraph.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "r0drv/alloc-r0drv.h"
/**
* Allocates temporary memory.
*
* Temporary memory blocks are used for not too large memory blocks which
* are believed not to stick around for too long. Using this API instead
* of RTMemAlloc() not only gives the heap manager room for optimization
* but makes the code easier to read.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
* @param cb Size in bytes of the memory block to allocated.
*/
{
return RTMemAlloc(cb);
}
/**
* Allocates zero'ed temporary memory.
*
* Same as RTMemTmpAlloc() but the memory will be zero'ed.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
* @param cb Size in bytes of the memory block to allocated.
*/
{
return RTMemAllocZ(cb);
}
/**
* Free temporary memory.
*
* @param pv Pointer to memory block.
*/
{
}
/**
* Allocates memory.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
* @param cb Size in bytes of the memory block to allocated.
*/
{
if (pHdr)
return pHdr + 1;
return NULL;
}
/**
* Allocates zero'ed memory.
*
* Instead of memset(pv, 0, sizeof()) use this when you want zero'ed
* memory. This keeps the code smaller and the heap can skip the memset
* in about 0.42% of calls :-).
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
* @param cb Size in bytes of the memory block to allocated.
*/
{
if (pHdr)
return NULL;
}
/**
* Reallocates memory.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
* @param pvOld The memory block to reallocate.
* @param cbNew The new block size (in bytes).
*/
{
if (!cbNew)
else if (!pvOld)
return RTMemAlloc(cbNew);
else
{
{
return pvOld;
if (pHdrNew)
{
return pHdrNew + 1;
}
}
else
AssertMsgFailed(("pHdrOld->u32Magic=%RX32 pvOld=%p cbNew=%#zx\n", pHdrOld->u32Magic, pvOld, cbNew));
}
return NULL;
}
/**
* Free memory related to an virtual machine
*
* @param pv Pointer to memory block.
*/
{
{
}
else
}
/**
* Allocates memory which may contain code.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
* @param cb Size in bytes of the memory block to allocate.
*/
{
if (pHdr)
return pHdr + 1;
return NULL;
}
/**
* Free executable/read/write memory allocated by RTMemExecAlloc().
*
* @param pv Pointer to memory block.
*/
{
if (!pv)
return;
else
}