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- Checked in MmMapLockedPages patch from Anich Gregor.
svn path=/trunk/; revision=8689
This commit is contained in:
David Welch
parent
35f3e5b524
commit
988f1d5968
2 changed files with 121 additions and 37 deletions
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@ -1,4 +1,4 @@
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/* $Id: mdl.c,v 1.59 2004/03/06 22:21:20 dwelch Exp $
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/* $Id: mdl.c,v 1.60 2004/03/13 19:14:16 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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@ -152,42 +152,78 @@ MmMapLockedPages(PMDL Mdl, KPROCESSOR_MODE AccessMode)
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KIRQL oldIrql;
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ULONG RegionSize;
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ULONG StartingOffset;
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PEPROCESS CurrentProcess, OldProcess;
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DPRINT("MmMapLockedPages(Mdl %x, AccessMode %x)\n", Mdl, AccessMode);
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if (Mdl->MdlFlags & MDL_SOURCE_IS_NONPAGED_POOL)
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if ((Mdl->MdlFlags & MDL_SOURCE_IS_NONPAGED_POOL) && AccessMode != UserMode)
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{
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return(Mdl->MappedSystemVa);
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}
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if (AccessMode == UserMode)
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{
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DPRINT1("MDL mapping to user-mode not yet handled.\n");
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KEBUGCHECK(0);
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}
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/* Calculate the number of pages required. */
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RegionSize = PAGE_ROUND_UP(Mdl->ByteCount + Mdl->ByteOffset) / PAGE_SIZE;
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/* Allocate that number of pages from the mdl mapping region. */
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KeAcquireSpinLock(&MiMdlMappingRegionLock, &oldIrql);
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if (AccessMode == UserMode)
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{
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MEMORY_AREA *Result;
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LARGE_INTEGER BoundaryAddressMultiple;
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NTSTATUS Status;
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StartingOffset = RtlFindClearBitsAndSet(&MiMdlMappingRegionAllocMap, RegionSize, MiMdlMappingRegionHint);
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BoundaryAddressMultiple.QuadPart = 0;
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Base = NULL;
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if (StartingOffset == 0xffffffff)
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{
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DPRINT1("Out of MDL mapping space\n");
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KEBUGCHECK(0);
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}
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CurrentProcess = OldProcess = PsGetCurrentProcess();
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if (Mdl->Process != CurrentProcess)
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{
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KeAttachProcess(Mdl->Process);
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CurrentProcess = Mdl->Process;
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}
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Base = (char*)MiMdlMappingRegionBase + StartingOffset * PAGE_SIZE;
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MmLockAddressSpace(&CurrentProcess->AddressSpace);
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Status = MmCreateMemoryArea(CurrentProcess,
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&CurrentProcess->AddressSpace,
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MEMORY_AREA_MDL_MAPPING,
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&Base,
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RegionSize * PAGE_SIZE,
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0, /* PAGE_READWRITE? */
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&Result,
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FALSE,
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FALSE,
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BoundaryAddressMultiple);
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MmUnlockAddressSpace(&CurrentProcess->AddressSpace);
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if (!NT_SUCCESS(Status))
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{
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KEBUGCHECK(0);
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/* FIXME: handle this? */
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}
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}
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else
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{
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CurrentProcess = OldProcess = NULL;
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/* Allocate that number of pages from the mdl mapping region. */
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KeAcquireSpinLock(&MiMdlMappingRegionLock, &oldIrql);
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StartingOffset = RtlFindClearBitsAndSet(&MiMdlMappingRegionAllocMap, RegionSize, MiMdlMappingRegionHint);
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if (StartingOffset == 0xffffffff)
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{
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DPRINT1("Out of MDL mapping space\n");
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KEBUGCHECK(0);
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}
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Base = (char*)MiMdlMappingRegionBase + StartingOffset * PAGE_SIZE;
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if (MiMdlMappingRegionHint == StartingOffset)
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{
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MiMdlMappingRegionHint +=RegionSize;
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}
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KeReleaseSpinLock(&MiMdlMappingRegionLock, oldIrql);
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}
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if (MiMdlMappingRegionHint == StartingOffset)
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{
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MiMdlMappingRegionHint +=RegionSize;
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}
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KeReleaseSpinLock(&MiMdlMappingRegionLock, oldIrql);
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/* Set the virtual mappings for the MDL pages. */
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MdlPages = (PULONG)(Mdl + 1);
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@ -198,7 +234,7 @@ MmMapLockedPages(PMDL Mdl, KPROCESSOR_MODE AccessMode)
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PHYSICAL_ADDRESS dummyJunkNeeded;
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dummyJunkNeeded.QuadPart = MdlPages[i];
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#endif
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Status = MmCreateVirtualMapping(NULL,
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Status = MmCreateVirtualMapping(CurrentProcess,
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(PVOID)((ULONG)Base+(i*PAGE_SIZE)),
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PAGE_READWRITE,
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#if defined(__GNUC__)
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@ -214,6 +250,11 @@ MmMapLockedPages(PMDL Mdl, KPROCESSOR_MODE AccessMode)
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}
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}
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if (AccessMode == UserMode && CurrentProcess != OldProcess)
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{
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KeDetachProcess();
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}
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/* Mark the MDL has having being mapped. */
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Mdl->MdlFlags = Mdl->MdlFlags | MDL_MAPPED_TO_SYSTEM_VA;
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Mdl->MappedSystemVa = (char*)Base + Mdl->ByteOffset;
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@ -236,6 +277,7 @@ MmUnmapLockedPages(PVOID BaseAddress, PMDL Mdl)
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ULONG i;
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ULONG RegionSize;
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ULONG Base;
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PEPROCESS CurrentProcess, OldProcess;
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DPRINT("MmUnmapLockedPages(BaseAddress %x, Mdl %x)\n", BaseAddress, Mdl);
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@ -243,11 +285,26 @@ MmUnmapLockedPages(PVOID BaseAddress, PMDL Mdl)
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* In this case, the MDL has the same system address as the base address
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* so there is no need to free it
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*/
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if (Mdl->MdlFlags & MDL_SOURCE_IS_NONPAGED_POOL)
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if ((Mdl->MdlFlags & MDL_SOURCE_IS_NONPAGED_POOL) &&
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((ULONG_PTR)BaseAddress >= KERNEL_BASE))
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{
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return;
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}
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if ((ULONG_PTR)BaseAddress >= KERNEL_BASE)
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{
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CurrentProcess = OldProcess = NULL;
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}
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else
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{
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CurrentProcess = OldProcess = PsGetCurrentProcess();
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if (Mdl->Process != CurrentProcess)
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{
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KeAttachProcess(Mdl->Process);
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CurrentProcess = Mdl->Process;
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}
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}
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/* Calculate the number of pages we mapped. */
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RegionSize = PAGE_ROUND_UP(Mdl->ByteCount + Mdl->ByteOffset) / PAGE_SIZE;
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#if defined(__GNUC__)
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@ -270,15 +327,36 @@ MmUnmapLockedPages(PVOID BaseAddress, PMDL Mdl)
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NULL);
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}
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KeAcquireSpinLock(&MiMdlMappingRegionLock, &oldIrql);
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/* Deallocate all the pages used. */
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Base = (ULONG)((char*)BaseAddress - (char*)MiMdlMappingRegionBase) / PAGE_SIZE;
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if ((DWORD)BaseAddress >= KERNEL_BASE)
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{
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KeAcquireSpinLock(&MiMdlMappingRegionLock, &oldIrql);
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/* Deallocate all the pages used. */
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Base = (ULONG)((char*)BaseAddress - (char*)MiMdlMappingRegionBase) / PAGE_SIZE;
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RtlClearBits(&MiMdlMappingRegionAllocMap, Base, RegionSize);
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RtlClearBits(&MiMdlMappingRegionAllocMap, Base, RegionSize);
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MiMdlMappingRegionHint = min (MiMdlMappingRegionHint, Base);
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MiMdlMappingRegionHint = min (MiMdlMappingRegionHint, Base);
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KeReleaseSpinLock(&MiMdlMappingRegionLock, oldIrql);
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KeReleaseSpinLock(&MiMdlMappingRegionLock, oldIrql);
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}
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else
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{
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MEMORY_AREA *Marea;
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Marea = MmOpenMemoryAreaByAddress( &CurrentProcess->AddressSpace, BaseAddress );
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if (Marea == NULL)
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{
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DPRINT1( "Couldn't open memory area when unmapping user-space pages!\n" );
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KEBUGCHECK(0);
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}
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MmFreeMemoryArea( &CurrentProcess->AddressSpace, Marea->BaseAddress, 0, NULL, NULL );
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if (CurrentProcess != OldProcess)
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{
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KeDetachProcess();
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}
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}
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/* Reset the MDL state. */
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Mdl->MdlFlags = Mdl->MdlFlags & ~MDL_MAPPED_TO_SYSTEM_VA;
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@ -16,7 +16,7 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* $Id: mm.c,v 1.68 2004/02/15 19:03:29 hbirr Exp $
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/* $Id: mm.c,v 1.69 2004/03/13 19:14:15 dwelch Exp $
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*
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* COPYRIGHT: See COPYING in the top directory
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* PROJECT: ReactOS kernel
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@ -35,6 +35,7 @@
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#include <internal/ntoskrnl.h>
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#include <internal/io.h>
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#include <internal/ps.h>
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#include <reactos/bugcodes.h>
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#define NDEBUG
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#include <internal/debug.h>
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@ -78,6 +79,11 @@ NTSTATUS MmReleaseMemoryArea(PEPROCESS Process, PMEMORY_AREA Marea)
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NULL,
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NULL);
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break;
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case MEMORY_AREA_MDL_MAPPING:
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KEBUGCHECK(PROCESS_HAS_LOCKED_PAGES);
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break;
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default:
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KEBUGCHECK(0);
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}
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