alloc-r0drv.cpp revision aa1f7d523397c12f6a7cedf1259a27c33e3aa16a
/* $Id$ */
/** @file
* innotek Portable Runtime - Memory Allocation, Ring-0 Driver.
*/
/*
* Copyright (C) 2006-2007 innotek 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 (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 "r0drv/alloc-r0drv.h"
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
#ifdef RT_STRICT
# define RTR0MEM_STRICT
#endif
#ifdef RTR0MEM_STRICT
# define RTR0MEM_FENCE_EXTRA 16
#else
# define RTR0MEM_FENCE_EXTRA 0
#endif
/*******************************************************************************
* Global Variables *
*******************************************************************************/
#ifdef RTR0MEM_STRICT
/** Fence data. */
{
0x77, 0x88, 0x66, 0x99, 0x55, 0xaa, 0x44, 0xbb,
0x33, 0xcc, 0x22, 0xdd, 0x11, 0xee, 0x00, 0xff
};
#endif
/**
* 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)
{
#ifdef RTR0MEM_STRICT
#endif
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)
{
#ifdef RTR0MEM_STRICT
#else
#endif
}
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)
{
#ifdef RTR0MEM_STRICT
AssertReleaseMsg(!memcmp((uint8_t *)(pHdrOld + 1) + pHdrOld->cbReq, &g_abFence[0], sizeof(g_abFence)),
("pHdr=%p pvOld=%p cb=%zu cbNew=%zu\n"
"fence: %.*Rhxs\n"
"expected: %.*Rhxs\n",
#endif
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.
*/
{
if (!pv)
return;
{
#ifdef RTR0MEM_STRICT
("pHdr=%p pv=%p cb=%zu\n"
"fence: %.*Rhxs\n"
"expected: %.*Rhxs\n",
#endif
}
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)
{
#ifdef RTR0MEM_STRICT
#endif
return pHdr + 1;
}
return NULL;
}
/**
* Free executable/read/write memory allocated by RTMemExecAlloc().
*
* @param pv Pointer to memory block.
*/
{
if (!pv)
return;
{
#ifdef RTR0MEM_STRICT
("pHdr=%p pv=%p cb=%zu\n"
"fence: %.*Rhxs\n"
"expected: %.*Rhxs\n",
#endif
}
else
}