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/* $Id: alloc-r0drv-nt.cpp $ */
/** @file
* IPRT - Memory Allocation, Ring-0 Driver, NT.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* 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 "the-nt-kernel.h"
#include "internal/iprt.h"
#include <iprt/mem.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include "r0drv/alloc-r0drv.h"
#include "internal-r0drv-nt.h"
/**
* OS specific allocation function.
*/
DECLHIDDEN(int) rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr)
{
if (!(fFlags & RTMEMHDR_FLAG_ANY_CTX))
{
PRTMEMHDR pHdr;
if (g_pfnrtExAllocatePoolWithTag)
{
if (!(fFlags & RTMEMHDR_FLAG_EXEC) && g_uRtNtVersion >= RTNT_MAKE_VERSION(8,0))
pHdr = (PRTMEMHDR)g_pfnrtExAllocatePoolWithTag(NonPagedPoolNx, cb + sizeof(*pHdr), IPRT_NT_POOL_TAG);
else
pHdr = (PRTMEMHDR)g_pfnrtExAllocatePoolWithTag(NonPagedPool, cb + sizeof(*pHdr), IPRT_NT_POOL_TAG);
}
else
pHdr = (PRTMEMHDR)ExAllocatePool(NonPagedPool, cb + sizeof(*pHdr));
if (pHdr)
{
pHdr->u32Magic = RTMEMHDR_MAGIC;
pHdr->fFlags = fFlags;
pHdr->cb = (uint32_t)cb; Assert(pHdr->cb == cb);
pHdr->cbReq = (uint32_t)cb;
*ppHdr = pHdr;
return VINF_SUCCESS;
}
return VERR_NO_MEMORY;
}
return VERR_NOT_SUPPORTED;
}
/**
* OS specific free function.
*/
DECLHIDDEN(void) rtR0MemFree(PRTMEMHDR pHdr)
{
pHdr->u32Magic += 1;
if (g_pfnrtExFreePoolWithTag)
g_pfnrtExFreePoolWithTag(pHdr, IPRT_NT_POOL_TAG);
else
ExFreePool(pHdr);
}
/**
* Allocates physical contiguous memory (below 4GB).
* 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);
}
}
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