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8434fc42db
Removed page directory references from machine independant code Implemented page table reference counting Added vm test application svn path=/trunk/; revision=1309
118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
/* $Id: ncache.c,v 1.6 2000/08/20 17:02:08 dwelch Exp $
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*
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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/cont.c
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* PURPOSE: Manages non-cached memory
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* PROGRAMMER: David Welch (welch@cwcom.net)
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* UPDATE HISTORY:
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* Created 22/05/98
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*/
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/* INCLUDES *****************************************************************/
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#include <ddk/ntddk.h>
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#include <internal/mm.h>
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#include <internal/ps.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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*/
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PVOID STDCALL 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 i;
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Result = NULL;
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Status = MmCreateMemoryArea (NULL,
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MmGetKernelAddressSpace(),
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MEMORY_AREA_NO_CACHE,
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&Result,
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NumberOfBytes,
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0,
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&marea);
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if (!NT_SUCCESS(Status))
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{
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return (NULL);
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}
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for (i = 0; (i <= (NumberOfBytes / PAGESIZE)); i++)
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{
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Status = MmCreateVirtualMapping (NULL,
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(Result + (i * PAGESIZE)),
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PAGE_READWRITE,
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(ULONG)MmAllocPage(0));
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if (!NT_SUCCESS(Status))
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{
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DbgPrint("Unable to create virtual mapping\n");
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KeBugCheck(0);
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}
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}
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return ((PVOID)Result);
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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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*/
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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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MmFreeMemoryArea (&PsGetCurrentProcess()->AddressSpace,
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BaseAddress,
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NumberOfBytes,
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TRUE);
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}
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/* EOF */
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