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128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: ntoskrnl/mm/ncache.c
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* PURPOSE: Manages non-cached memory
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*
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* PROGRAMMERS: David Welch (welch@cwcom.net)
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*/
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/* INCLUDES *****************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <internal/debug.h>
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/* FUNCTIONS *****************************************************************/
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/**********************************************************************
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* NAME EXPORTED
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* MmAllocateNonCachedMemory@4
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*
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* DESCRIPTION
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* Allocates a virtual address range of noncached and cache
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* aligned memory.
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*
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* ARGUMENTS
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* NumberOfBytes
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* Size of region to allocate.
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*
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* RETURN VALUE
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* The base address of the range on success;
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* NULL on failure.
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*
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* NOTE
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* Description taken from include/ddk/mmfuncs.h.
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* Code taken from ntoskrnl/mm/special.c.
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*
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* REVISIONS
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*
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* @implemented
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*/
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PVOID STDCALL
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MmAllocateNonCachedMemory(IN ULONG NumberOfBytes)
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{
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PVOID Result;
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MEMORY_AREA* marea;
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NTSTATUS Status;
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ULONG Protect = PAGE_READWRITE|PAGE_SYSTEM|PAGE_NOCACHE|PAGE_WRITETHROUGH;
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PHYSICAL_ADDRESS BoundaryAddressMultiple;
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BoundaryAddressMultiple.QuadPart = 0;
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MmLockAddressSpace(MmGetKernelAddressSpace());
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Result = NULL;
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Status = MmCreateMemoryArea (MmGetKernelAddressSpace(),
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MEMORY_AREA_NO_CACHE,
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&Result,
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NumberOfBytes,
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Protect,
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&marea,
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FALSE,
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0,
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BoundaryAddressMultiple);
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MmUnlockAddressSpace(MmGetKernelAddressSpace());
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Allocating marea for noncached mem failed with Status "
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"0x%08X\n", Status);
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return (NULL);
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}
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/* Create a virtual mapping for this memory area */
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MmMapMemoryArea(Result, NumberOfBytes, MC_NPPOOL, Protect);
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return ((PVOID)Result);
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}
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VOID static
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MmFreeNonCachedPage(PVOID Context, MEMORY_AREA* MemoryArea, PVOID Address,
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PFN_TYPE Page, SWAPENTRY SwapEntry,
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BOOLEAN Dirty)
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{
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ASSERT(SwapEntry == 0);
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if (Page != 0)
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{
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MmReleasePageMemoryConsumer(MC_NPPOOL, Page);
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}
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}
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/**********************************************************************
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* NAME EXPORTED
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* MmFreeNonCachedMemory@8
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*
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* DESCRIPTION
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* Releases a range of noncached memory allocated with
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* MmAllocateNonCachedMemory.
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*
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* ARGUMENTS
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* BaseAddress
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* Virtual address to be freed;
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*
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* NumberOfBytes
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* Size of the region to be freed.
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*
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* RETURN VALUE
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* None.
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*
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* NOTE
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* Description taken from include/ddk/mmfuncs.h.
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* Code taken from ntoskrnl/mm/special.c.
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*
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* REVISIONS
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*
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* @implemented
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*/
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VOID STDCALL MmFreeNonCachedMemory (IN PVOID BaseAddress,
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IN ULONG NumberOfBytes)
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{
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MmLockAddressSpace(MmGetKernelAddressSpace());
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MmFreeMemoryAreaByPtr(MmGetKernelAddressSpace(),
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BaseAddress,
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MmFreeNonCachedPage,
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NULL);
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MmUnlockAddressSpace(MmGetKernelAddressSpace());
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}
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/* EOF */
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