| 1 | /* $Id: alloc-r0drv-nt.cpp 44528 2013-02-04 14:27:54Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Memory Allocation, Ring-0 Driver, NT.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2011 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*******************************************************************************
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| 29 | * Header Files *
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| 30 | *******************************************************************************/
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| 31 | #include "the-nt-kernel.h"
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| 32 | #include "internal/iprt.h"
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| 33 | #include <iprt/mem.h>
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| 34 |
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| 35 | #include <iprt/assert.h>
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| 36 | #include <iprt/err.h>
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| 37 | #include "r0drv/alloc-r0drv.h"
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| 38 |
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| 39 |
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| 40 | /**
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| 41 | * OS specific allocation function.
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| 42 | */
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| 43 | DECLHIDDEN(int) rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr)
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| 44 | {
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| 45 | if (fFlags & RTMEMHDR_FLAG_ANY_CTX)
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| 46 | return VERR_NOT_SUPPORTED;
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| 47 |
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| 48 | PRTMEMHDR pHdr = (PRTMEMHDR)ExAllocatePoolWithTag(NonPagedPool, cb + sizeof(*pHdr), IPRT_NT_POOL_TAG);
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| 49 | if (RT_UNLIKELY(!pHdr))
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| 50 | return VERR_NO_MEMORY;
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| 51 |
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| 52 | pHdr->u32Magic = RTMEMHDR_MAGIC;
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| 53 | pHdr->fFlags = fFlags;
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| 54 | pHdr->cb = (uint32_t)cb; Assert(pHdr->cb == cb);
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| 55 | pHdr->cbReq = (uint32_t)cb;
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| 56 | *ppHdr = pHdr;
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| 57 | return VINF_SUCCESS;
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| 58 | }
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| 59 |
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| 60 |
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| 61 | /**
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| 62 | * OS specific free function.
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| 63 | */
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| 64 | DECLHIDDEN(void) rtR0MemFree(PRTMEMHDR pHdr)
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| 65 | {
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| 66 | pHdr->u32Magic += 1;
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| 67 | ExFreePool(pHdr);
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| 68 | }
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| 69 |
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| 70 |
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| 71 | /**
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| 72 | * Allocates physical contiguous memory (below 4GB).
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| 73 | * The allocation is page aligned and its contents is undefined.
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| 74 | *
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| 75 | * @returns Pointer to the memory block. This is page aligned.
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| 76 | * @param pPhys Where to store the physical address.
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| 77 | * @param cb The allocation size in bytes. This is always
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| 78 | * rounded up to PAGE_SIZE.
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| 79 | */
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| 80 | RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb)
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| 81 | {
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| 82 | /*
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| 83 | * validate input.
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| 84 | */
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| 85 | Assert(VALID_PTR(pPhys));
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| 86 | Assert(cb > 0);
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| 87 |
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| 88 | /*
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| 89 | * Allocate and get physical address.
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| 90 | * Make sure the return is page aligned.
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| 91 | */
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| 92 | PHYSICAL_ADDRESS MaxPhysAddr;
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| 93 | MaxPhysAddr.HighPart = 0;
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| 94 | MaxPhysAddr.LowPart = 0xffffffff;
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| 95 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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| 96 | void *pv = MmAllocateContiguousMemory(cb, MaxPhysAddr);
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| 97 | if (pv)
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| 98 | {
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| 99 | if (!((uintptr_t)pv & PAGE_OFFSET_MASK)) /* paranoia */
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| 100 | {
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| 101 | PHYSICAL_ADDRESS PhysAddr = MmGetPhysicalAddress(pv);
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| 102 | if (!PhysAddr.HighPart) /* paranoia */
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| 103 | {
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| 104 | *pPhys = (RTCCPHYS)PhysAddr.LowPart;
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| 105 | return pv;
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| 106 | }
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| 107 |
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| 108 | /* failure */
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| 109 | AssertMsgFailed(("MMAllocContiguousMemory returned high address! PhysAddr=%RX64\n", (uint64_t)PhysAddr.QuadPart));
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| 110 | }
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| 111 | else
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| 112 | AssertMsgFailed(("MMAllocContiguousMemory didn't return a page aligned address - %p!\n", pv));
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| 113 |
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| 114 | MmFreeContiguousMemory(pv);
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| 115 | }
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| 116 |
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| 117 | return NULL;
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| 118 | }
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| 119 |
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| 120 |
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| 121 | /**
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| 122 | * Frees memory allocated ysing RTMemContAlloc().
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| 123 | *
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| 124 | * @param pv Pointer to return from RTMemContAlloc().
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| 125 | * @param cb The cb parameter passed to RTMemContAlloc().
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| 126 | */
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| 127 | RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
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| 128 | {
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| 129 | if (pv)
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| 130 | {
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| 131 | Assert(cb > 0); NOREF(cb);
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| 132 | AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv));
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| 133 | MmFreeContiguousMemory(pv);
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| 134 | }
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| 135 | }
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| 136 |
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