alloc-r0drv-nt.cpp revision c9d946114a9ea763c911779b30c01941dc45c179
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync/* $Id$ */
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync/** @file
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * innotek Portable Runtime - Memory Allocation, Ring-0 Driver, NT.
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync */
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync/*
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * Copyright (C) 2006-2007 innotek GmbH
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync *
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * available from http://www.virtualbox.org. This file is free software;
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * you can redistribute it and/or modify it under the terms of the GNU
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * General Public License (GPL) as published by the Free Software
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync *
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * The contents of this file may alternatively be used under the terms
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * of the Common Development and Distribution License Version 1.0
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync * VirtualBox OSE distribution, in which case the provisions of the
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync * CDDL are applicable instead of those of the GPL.
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync *
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync * You may elect to license modified versions of this file under the
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync * terms and conditions of either the GPL or the CDDL or both.
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync */
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync
930b5f872e89407f445d4000d4e4aaecaa6a0998vboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync/*******************************************************************************
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync* Header Files *
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync*******************************************************************************/
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync#include "the-nt-kernel.h"
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync#include <iprt/alloc.h>
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync#include <iprt/assert.h>
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync#include "r0drv/alloc-r0drv.h"
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync/**
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * OS specific allocation function.
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync */
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsyncPRTMEMHDR rtMemAlloc(size_t cb, uint32_t fFlags)
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync{
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync PRTMEMHDR pHdr = (PRTMEMHDR)ExAllocatePoolWithTag(NonPagedPool, cb + sizeof(*pHdr), IPRT_NT_POOL_TAG);
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync if (pHdr)
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync {
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync pHdr->u32Magic = RTMEMHDR_MAGIC;
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync pHdr->fFlags = fFlags;
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync pHdr->cb = cb;
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync pHdr->u32Padding= 0;
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync }
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync return pHdr;
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync}
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync/**
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * OS specific free function.
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync */
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsyncvoid rtMemFree(PRTMEMHDR pHdr)
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync{
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync pHdr->u32Magic += 1;
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync ExFreePool(pHdr);
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync}
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync/**
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * Allocates physical contiguous memory (below 4GB).
3194da424708abdd288b28d96892b3a5f3f7df0bvboxsync * The allocation is page aligned and its contents is undefined.
*
* @returns Pointer to the memory block. This is page aligned.
* @param pPhys Where to store the physical address.
* @param cb The allocation size in bytes. This is always
* rounded up to PAGE_SIZE.
*/
RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb)
{
/*
* validate input.
*/
Assert(VALID_PTR(pPhys));
Assert(cb > 0);
/*
* Allocate and get physical address.
* Make sure the return is page aligned.
*/
PHYSICAL_ADDRESS MaxPhysAddr;
MaxPhysAddr.HighPart = 0;
MaxPhysAddr.LowPart = 0xffffffff;
cb = RT_ALIGN_Z(cb, PAGE_SIZE);
void *pv = MmAllocateContiguousMemory(cb, MaxPhysAddr);
if (pv)
{
if (!((uintptr_t)pv & PAGE_OFFSET_MASK)) /* paranoia */
{
PHYSICAL_ADDRESS PhysAddr = MmGetPhysicalAddress(pv);
if (!PhysAddr.HighPart) /* paranoia */
{
*pPhys = (RTCCPHYS)PhysAddr.LowPart;
return pv;
}
/* failure */
AssertMsgFailed(("MMAllocContiguousMemory returned high address! PhysAddr=%RX64\n", (uint64_t)PhysAddr.QuadPart));
}
else
AssertMsgFailed(("MMAllocContiguousMemory didn't return a page aligned address - %p!\n", pv));
MmFreeContiguousMemory(pv);
}
return NULL;
}
/**
* Frees memory allocated ysing RTMemContAlloc().
*
* @param pv Pointer to return from RTMemContAlloc().
* @param cb The cb parameter passed to RTMemContAlloc().
*/
RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
{
if (pv)
{
Assert(cb > 0); NOREF(cb);
AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv));
MmFreeContiguousMemory(pv);
}
}