| 1 | /* $Id: alloc-r0drv-nt.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
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| 2 | /** @file
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| 3 | * InnoTek Portable Runtime - 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 InnoTek Systemberatung GmbH
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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 as published by the Free Software Foundation,
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| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * If you received this file as part of a commercial VirtualBox
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| 18 | * distribution, then only the terms of your commercial VirtualBox
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| 19 | * license agreement apply instead of the previous paragraph.
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| 20 | */
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| 21 |
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| 22 |
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| 23 | /*******************************************************************************
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| 24 | * Header Files *
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| 25 | *******************************************************************************/
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| 26 | #include "the-nt-kernel.h"
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| 27 |
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| 28 | #include <iprt/alloc.h>
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| 29 | #include <iprt/assert.h>
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| 30 | #include "r0drv/alloc-r0drv.h"
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * OS specific allocation function.
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| 35 | */
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| 36 | PRTMEMHDR rtMemAlloc(size_t cb, uint32_t fFlags)
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| 37 | {
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| 38 | Assert(cb != sizeof(void *)); /* 99% of pointer sized allocations are wrong. */
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| 39 | PRTMEMHDR pHdr = (PRTMEMHDR)ExAllocatePoolWithTag(NonPagedPool, cb + sizeof(*pHdr), 'iprt');
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| 40 | if (pHdr)
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| 41 | {
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| 42 | pHdr->u32Magic = RTMEMHDR_MAGIC;
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| 43 | pHdr->fFlags = fFlags;
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| 44 | pHdr->cb = cb;
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| 45 | pHdr->u32Padding= 0;
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| 46 | }
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| 47 | return pHdr;
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| 48 | }
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| 49 |
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| 50 |
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| 51 | /**
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| 52 | * OS specific free function.
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| 53 | */
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| 54 | void rtMemFree(PRTMEMHDR pHdr)
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| 55 | {
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| 56 | pHdr->u32Magic += 1;
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| 57 | ExFreePool(pHdr);
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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 | * Allocates physical contiguous memory (below 4GB).
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| 63 | * The allocation is page aligned and the content is undefined.
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| 64 | *
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| 65 | * @returns Pointer to the memory block. This is page aligned.
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| 66 | * @param pPhys Where to store the physical address.
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| 67 | * @param cb The allocation size in bytes. This is always
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| 68 | * rounded up to PAGE_SIZE.
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| 69 | */
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| 70 | RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb)
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| 71 | {
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| 72 | /*
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| 73 | * validate input.
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| 74 | */
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| 75 | Assert(VALID_PTR(pPhys));
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| 76 | Assert(cb > 0);
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| 77 |
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| 78 | /*
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| 79 | * Allocate and get physical address.
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| 80 | * Make sure the return is page aligned.
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| 81 | */
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| 82 | PHYSICAL_ADDRESS MaxPhysAddr;
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| 83 | MaxPhysAddr.HighPart = 0;
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| 84 | MaxPhysAddr.LowPart = 0xffffffff;
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| 85 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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| 86 | void *pv = MmAllocateContiguousMemory(cb, MaxPhysAddr);
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| 87 | if (pv)
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| 88 | {
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| 89 | if (!((uintptr_t)pv & PAGE_OFFSET_MASK)) /* paranoia */
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| 90 | {
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| 91 | PHYSICAL_ADDRESS PhysAddr = MmGetPhysicalAddress(pv);
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| 92 | if (!PhysAddr.HighPart) /* paranoia */
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| 93 | {
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| 94 | *pPhys = (RTCCPHYS)PhysAddr.LowPart;
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| 95 | return pv;
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| 96 | }
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| 97 |
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| 98 | /* failure */
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| 99 | AssertMsgFailed(("MMAllocContiguousMemory returned high address! PhysAddr=%RX64\n", (uint64_t)PhysAddr.QuadPart));
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| 100 | }
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| 101 | else
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| 102 | AssertMsgFailed(("MMAllocContiguousMemory didn't return a page aligned address - %p!\n", pv));
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| 103 |
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| 104 | MmFreeContiguousMemory(pv);
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| 105 | }
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| 106 |
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| 107 | return NULL;
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| 108 | }
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| 109 |
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| 110 |
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| 111 | /**
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| 112 | * Frees memory allocated ysing RTMemContAlloc().
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| 113 | *
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| 114 | * @param pv Pointer to return from RTMemContAlloc().
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| 115 | * @param cb The cb parameter passed to RTMemContAlloc().
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| 116 | */
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| 117 | RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
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| 118 | {
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| 119 | if (pv)
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| 120 | {
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| 121 | Assert(cb > 0); NOREF(cb);
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| 122 | AssertMsg(!((uintptr_t)pv & PAGE_OFFSET_MASK), ("pv=%p\n", pv));
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| 123 | MmFreeContiguousMemory(pv);
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| 124 | }
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| 125 | }
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| 126 |
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