ASSERT(ActualPages <= PageCount);
/* Release the working set lock */
-// MiUnlockWorkingSet(PsGetCurrentThread(),
+// MiUnlockWorkingSet(PsGetCurrentThread(),
// &MmSessionSpace->GlobalVirtualAddress->Vm);
-
+
/* If we did at least one page... */
if (ActualPages)
{
{
/* Create the PDEs needed for this mapping */
Status = MiSessionCommitPageTables(Base,
- (PVOID)((ULONG_PTR)Base +
+ (PVOID)((ULONG_PTR)Base +
Buckets * MI_SYSTEM_VIEW_BUCKET_SIZE));
NT_ASSERT(NT_SUCCESS(Status));
}
return STATUS_SUCCESS;
}
+VOID
+NTAPI
+MiSubsectionConsistent(IN PSUBSECTION Subsection)
+{
+ /* ReactOS only supports systems with 4K pages and 4K sectors */
+ ASSERT(Subsection->u.SubsectionFlags.SectorEndOffset == 0);
+
+ /* Therefore, then number of PTEs should be equal to the number of sectors */
+ if (Subsection->NumberOfFullSectors != Subsection->PtesInSubsection)
+ {
+ /* Break and warn if this is inconsistent */
+ DPRINT1("Mm: Subsection inconsistent (%x vs %x)\n",
+ Subsection->NumberOfFullSectors, Subsection->PtesInSubsection);
+ DbgBreakPoint();
+ }
+}
+
+NTSTATUS
+NTAPI
+MiCreateDataFileMap(IN PFILE_OBJECT File,
+ OUT PSEGMENT *Segment,
+ IN PSIZE_T MaximumSize,
+ IN ULONG SectionPageProtection,
+ IN ULONG AllocationAttributes,
+ IN ULONG IgnoreFileSizing)
+{
+ /* Not yet implemented */
+ ASSERT(FALSE);
+ return STATUS_NOT_IMPLEMENTED;
+}
+
NTSTATUS
NTAPI
MiCreatePagingFileMap(OUT PSEGMENT *Segment,
SECTION Section;
PSECTION NewSection;
PSUBSECTION Subsection;
- PSEGMENT NewSegment;
+ PSEGMENT NewSegment, Segment;
NTSTATUS Status;
PCONTROL_AREA ControlArea;
- ULONG ProtectionMask;
-
- /* ARM3 does not yet support this */
- ASSERT(FileHandle == NULL);
- ASSERT(FileObject == NULL);
- ASSERT((AllocationAttributes & SEC_LARGE_PAGES) == 0);
+ ULONG ProtectionMask, ControlAreaSize, Size, NonPagedCharge, PagedCharge;
+ KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
+ BOOLEAN FileLock = FALSE, KernelCall = FALSE;
+ KIRQL OldIrql;
+ PFILE_OBJECT File;
+ PVOID PreviousSectionPointer;
/* Make the same sanity checks that the Nt interface should've validated */
ASSERT((AllocationAttributes & ~(SEC_COMMIT | SEC_RESERVE | SEC_BASED |
ProtectionMask = MiMakeProtectionMask(SectionPageProtection);
if (ProtectionMask == MM_INVALID_PROTECTION) return STATUS_INVALID_PAGE_PROTECTION;
- /* A handle must be supplied with SEC_IMAGE, and this is the no-handle path */
- if (AllocationAttributes & SEC_IMAGE) return STATUS_INVALID_FILE_FOR_SECTION;
+ /* Check if this is going to be a data or image backed file section */
+ if ((FileHandle) || (FileObject))
+ {
+ /* These cannot be mapped with large pages */
+ if (AllocationAttributes & SEC_LARGE_PAGES) return STATUS_INVALID_PARAMETER_6;
- /* So this must be a pagefile-backed section, create the mappings needed */
- Status = MiCreatePagingFileMap(&NewSegment,
- (PSIZE_T)InputMaximumSize,
- ProtectionMask,
- AllocationAttributes);
- ASSERT(NT_SUCCESS(Status));
- ASSERT(NewSegment != NULL);
+ /* For now, only support the mechanism through a file handle */
+ ASSERT(FileObject == NULL);
+
+ /* Reference the file handle to get the object */
+ Status = ObReferenceObjectByHandle(FileHandle,
+ MmMakeFileAccess[ProtectionMask],
+ IoFileObjectType,
+ PreviousMode,
+ (PVOID*)&File,
+ NULL);
+ if (!NT_SUCCESS(Status)) return Status;
+
+ /* Make sure Cc has been doing its job */
+ if (!File->SectionObjectPointer)
+ {
+ /* This is not a valid file system-based file, fail */
+ ObDereferenceObject(File);
+ return STATUS_INVALID_FILE_FOR_SECTION;
+ }
+
+ /* Image-file backed sections are not yet supported */
+ ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
+
+ /* Compute the size of the control area, and allocate it */
+ ControlAreaSize = sizeof(CONTROL_AREA) + sizeof(MSUBSECTION);
+ ControlArea = ExAllocatePoolWithTag(NonPagedPool, ControlAreaSize, 'aCmM');
+ if (!ControlArea)
+ {
+ ObDereferenceObject(File);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ /* Zero it out */
+ RtlZeroMemory(ControlArea, ControlAreaSize);
+
+ /* Did we get a handle, or an object? */
+ if (FileHandle)
+ {
+ /* We got a file handle so we have to lock down the file */
+#if 0
+ Status = FsRtlAcquireToCreateMappedSection(File, SectionPageProtection);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePool(ControlArea);
+ ObDereferenceObject(File);
+ return Status;
+ }
+#else
+ /* ReactOS doesn't support this API yet, so do nothing */
+ Status = STATUS_SUCCESS;
+#endif
+ /* Update the top-level IRP so that drivers know what's happening */
+ IoSetTopLevelIrp((PIRP)FSRTL_FSP_TOP_LEVEL_IRP);
+ FileLock = TRUE;
+ }
+
+ /* Lock the PFN database while we play with the section pointers */
+ OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
+
+ /* Image-file backed sections are not yet supported */
+ ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
+
+ /* There should not already be a control area for this file */
+ ASSERT(File->SectionObjectPointer->DataSectionObject == NULL);
+ NewSegment = NULL;
+
+ /* Write down that this CA is being created, and set it */
+ ControlArea->u.Flags.BeingCreated = TRUE;
+ PreviousSectionPointer = File->SectionObjectPointer;
+ File->SectionObjectPointer->DataSectionObject = ControlArea;
+
+ /* We can release the PFN lock now */
+ KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
+
+ /* We don't support previously-mapped file */
+ ASSERT(NewSegment == NULL);
+
+ /* Image-file backed sections are not yet supported */
+ ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
+
+ /* So we always create a data file map */
+ Status = MiCreateDataFileMap(File,
+ &Segment,
+ (PSIZE_T)InputMaximumSize,
+ SectionPageProtection,
+ AllocationAttributes,
+ KernelCall);
+ ASSERT(PreviousSectionPointer == File->SectionObjectPointer);
+ ASSERT(NT_SUCCESS(Status));
+
+ /* Check if a maximum size was specified */
+ if (!InputMaximumSize->QuadPart)
+ {
+ /* Nope, use the segment size */
+ Section.SizeOfSection.QuadPart = (LONGLONG)Segment->SizeOfSegment;
+ }
+ else
+ {
+ /* Yep, use the entered size */
+ Section.SizeOfSection.QuadPart = InputMaximumSize->QuadPart;
+ }
+
+ }
+ else
+ {
+ /* A handle must be supplied with SEC_IMAGE, as this is the no-handle path */
+ if (AllocationAttributes & SEC_IMAGE) return STATUS_INVALID_FILE_FOR_SECTION;
+
+ /* Not yet supported */
+ ASSERT((AllocationAttributes & SEC_LARGE_PAGES) == 0);
+
+ /* So this must be a pagefile-backed section, create the mappings needed */
+ Status = MiCreatePagingFileMap(&NewSegment,
+ (PSIZE_T)InputMaximumSize,
+ ProtectionMask,
+ AllocationAttributes);
+ ASSERT(NT_SUCCESS(Status));
+
+ /* Set the size here, and read the control area */
+ Section.SizeOfSection.QuadPart = NewSegment->SizeOfSegment;
+ ControlArea = NewSegment->ControlArea;
+ }
+
+ /* Did we already have a segment? */
+ if (!NewSegment)
+ {
+ /* This must be the file path and we created a segment */
+ NewSegment = Segment;
+ ASSERT(File != NULL);
+
+ /* Acquire the PFN lock while we set control area flags */
+ OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
+
+ /* We don't support this race condition yet, so assume no waiters */
+ ASSERT(ControlArea->WaitingForDeletion == NULL);
+ ControlArea->WaitingForDeletion = NULL;
+
+ /* Image-file backed sections are not yet supported, nor ROM images */
+ ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
+ ASSERT(Segment->ControlArea->u.Flags.Rom == 0);
+
+ /* Take off the being created flag, and then release the lock */
+ ControlArea->u.Flags.BeingCreated = FALSE;
+ KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
+ }
+
+ /* Check if we locked the file earlier */
+ if (FileLock)
+ {
+ /* Reset the top-level IRP and release the lock */
+ IoSetTopLevelIrp(NULL);
+ //FsRtlReleaseFile(File);
+ FileLock = FALSE;
+ }
/* Set the initial section object data */
Section.InitialPageProtection = SectionPageProtection;
- Section.SizeOfSection.QuadPart = NewSegment->SizeOfSegment;
- Section.Segment = NewSegment;
- /* THe mapping created a control area and segment, save the flags */
- ControlArea = NewSegment->ControlArea;
+ /* The mapping created a control area and segment, save the flags */
+ Section.Segment = NewSegment;
Section.u.LongFlags = ControlArea->u.LongFlags;
- /* ARM3 cannot support these right now, make sure they're not being set */
- ASSERT(ControlArea->u.Flags.Image == 0);
- ASSERT(ControlArea->FilePointer == NULL);
+ /* Check if this is a user-mode read-write non-image file mapping */
+ if (!(FileObject) &&
+ (SectionPageProtection & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE)) &&
+ (ControlArea->u.Flags.Image == 0) &&
+ (ControlArea->FilePointer != NULL))
+ {
+ /* Add a reference and set the flag */
+ Section.u.Flags.UserWritable = 1;
+ InterlockedIncrement((PLONG)&ControlArea->WritableUserReferences);
+ }
+
+ /* Check for image mappings or page file mappings */
+ if ((ControlArea->u.Flags.Image == 1) || !(ControlArea->FilePointer))
+ {
+ /* Charge the segment size, and allocate a subsection */
+ PagedCharge = sizeof(SECTION) + NewSegment->TotalNumberOfPtes * sizeof(MMPTE);
+ Size = sizeof(SUBSECTION);
+ }
+ else
+ {
+ /* Charge nothing, and allocate a mapped subsection */
+ PagedCharge = 0;
+ Size = sizeof(MSUBSECTION);
+ }
+
+ /* Check if this is a normal CA */
ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);
ASSERT(ControlArea->u.Flags.Rom == 0);
- ASSERT(ControlArea->u.Flags.WasPurged == 0);
- /* A pagefile-backed mapping only has one subsection, and this is all ARM3 supports */
+ /* Charge only a CA, and the subsection is right after */
+ NonPagedCharge = sizeof(CONTROL_AREA);
Subsection = (PSUBSECTION)(ControlArea + 1);
+
+ /* We only support single-subsection mappings */
+ NonPagedCharge += Size;
ASSERT(Subsection->NextSubsection == NULL);
/* Create the actual section object, with enough space for the prototype PTEs */
- Status = ObCreateObject(ExGetPreviousMode(),
+ Status = ObCreateObject(PreviousMode,
MmSectionObjectType,
ObjectAttributes,
- ExGetPreviousMode(),
+ PreviousMode,
NULL,
sizeof(SECTION),
- sizeof(SECTION) +
- NewSegment->TotalNumberOfPtes * sizeof(MMPTE),
- sizeof(CONTROL_AREA) + sizeof(SUBSECTION),
+ PagedCharge,
+ NonPagedCharge,
(PVOID*)&NewSection);
ASSERT(NT_SUCCESS(Status));
/* Now copy the local section object from the stack into this new object */
RtlCopyMemory(NewSection, &Section, sizeof(SECTION));
NewSection->Address.StartingVpn = 0;
+
+ /* For now, only user calls are supported */
+ ASSERT(KernelCall == FALSE);
NewSection->u.Flags.UserReference = TRUE;
/* Migrate the attribute into a flag */
KeReleaseGuardedMutex(&MmSectionBasedMutex);
}
+ /* Write down if this was a kernel call */
+ ControlArea->u.Flags.WasPurged |= KernelCall;
+ ASSERT(ControlArea->u.Flags.WasPurged == FALSE);
+
+ /* Make sure the segment and the section are the same size, or the section is smaller */
+ ASSERT(NewSection->SizeOfSection.QuadPart <= NewSection->Segment->SizeOfSegment);
+
/* Return the object and the creation status */
*SectionObject = (PVOID)NewSection;
return Status;
projects / reactos.git / commitdiff