INLINE
VOID
LfsFreeNonPagedFcb (
PNON_PAGED_FCB NonPagedFcb
)
{
#if FAT_FILL_FREE
RtlFillMemoryUlong(NonPagedFcb, sizeof(NON_PAGED_FCB), FAT_FILL_FREE);
#endif
ExFreeToNPagedLookasideList( &GlobalLfs.NonPagedFcbLookasideList, (PVOID) NonPagedFcb );
}
INLINE
VOID
LfsFreeResource (
IN PERESOURCE Resource
)
{
ExDeleteResourceLite( Resource );
#if FAT_FILL_FREE
RtlFillMemoryUlong(Resource, sizeof(ERESOURCE), FAT_FILL_FREE);
#endif
ExFreeToNPagedLookasideList( &GlobalLfs.EResourceLookasideList, (PVOID) Resource );
}
USHORT
NTAPI
KeRosCaptureUserStackBackTrace(IN ULONG FramesToSkip,
IN ULONG FramesToCapture,
OUT PVOID *BackTrace,
OUT PULONG BackTraceHash OPTIONAL)
{
PVOID Frames[2 * 64];
ULONG FrameCount;
ULONG Hash = 0, i;
/* Skip a frame for the caller */
FramesToSkip++;
/* Don't go past the limit */
if ((FramesToCapture + FramesToSkip) >= 128) return 0;
/* Do the back trace */
FrameCount = RtlWalkFrameChain(Frames, FramesToCapture + FramesToSkip, 1);
/* Make sure we're not skipping all of them */
if (FrameCount <= FramesToSkip) return 0;
/* Loop all the frames */
for (i = 0; i < FramesToCapture; i++)
{
/* Don't go past the limit */
if ((FramesToSkip + i) >= FrameCount) break;
/* Save this entry and hash it */
BackTrace[i] = Frames[FramesToSkip + i];
Hash += PtrToUlong(BackTrace[i]);
}
/* Write the hash */
if (BackTraceHash) *BackTraceHash = Hash;
/* Clear the other entries and return count */
RtlFillMemoryUlong(Frames, 128, 0);
return (USHORT)i;
}
NTSTATUS
NTAPI
DriverEntry(IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath)
{
HEADLESS_RSP_QUERY_INFO HeadlessInformation;
ULONG InfoSize = sizeof(HeadlessInformation);
NTSTATUS Status;
UNICODE_STRING DriverName;
PDEVICE_OBJECT DeviceObject;
PSAC_DEVICE_EXTENSION DeviceExtension;
PAGED_CODE();
SAC_DBG(SAC_DBG_ENTRY_EXIT, "Entering.\n");
/* Check if EMS is enabled in the kernel */
HeadlessDispatch(HeadlessCmdQueryInformation,
NULL,
0,
&HeadlessInformation,
&InfoSize);
if ((HeadlessInformation.Serial.TerminalType != HeadlessUndefinedPortType) &&
((HeadlessInformation.Serial.TerminalType != HeadlessSerialPort) ||
(HeadlessInformation.Serial.TerminalAttached)))
{
/* It is, so create the device */
RtlInitUnicodeString(&DriverName, L"\\Device\\SAC");
Status = IoCreateDevice(DriverObject,
sizeof(SAC_DEVICE_EXTENSION),
&DriverName,
FILE_DEVICE_UNKNOWN,
FILE_DEVICE_SECURE_OPEN,
FALSE,
&DeviceObject);
if (NT_SUCCESS(Status))
{
/* Setup the device extension */
DeviceExtension = DeviceObject->DeviceExtension;
DeviceExtension->Initialized = FALSE;
/* Initialize the driver object */
RtlFillMemoryUlong(DriverObject->MajorFunction,
RTL_NUMBER_OF(DriverObject->MajorFunction),
(ULONG_PTR)Dispatch);
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = DispatchDeviceControl;
DriverObject->MajorFunction[IRP_MJ_SHUTDOWN] = DispatchShutdownControl;
DriverObject->FastIoDispatch = NULL;
DriverObject->DriverUnload = UnloadHandler;
/* Initialize driver data */
if (InitializeGlobalData(RegistryPath, DriverObject))
{
/* Initialize device data */
if (InitializeDeviceData(DeviceObject))
{
/* We're all good, register a shutdown notification */
IoRegisterShutdownNotification(DeviceObject);
return Status;
}
}
/* One of the initializations failed, bail out */
Status = STATUS_INSUFFICIENT_RESOURCES;
}
else
{
/* Print a debug statement if enabled */
SAC_DBG(SAC_DBG_INIT, "unable to create device object: %X\n", Status);
}
/* Free any data we may have allocated and exit with failure */
FreeGlobalData();
SAC_DBG(SAC_DBG_ENTRY_EXIT, "Exiting with status 0x%x\n", Status);
return Status;
}
/* EMS is not enabled */
return STATUS_PORT_DISCONNECTED;
}
NTSTATUS
MiCcPutPagesInTransition (
IN PMI_READ_INFO MiReadInfo
)
/*++
Routine Description:
This routine allocates physical memory for the specified read-list and
puts all the pages in transition (so collided faults from other threads
for these same pages remain coherent). I/O for any pages not already
resident are issued here. The caller must wait for their completion.
Arguments:
MiReadInfo - Supplies a pointer to the read-list.
Return Value:
STATUS_SUCCESS - all the pages were already resident, reference counts
have been applied and no I/O needs to be waited for.
STATUS_ISSUE_PAGING_IO - the I/O has been issued and the caller must wait.
Various other failure status values indicate the operation failed.
Environment:
Kernel mode. PASSIVE_LEVEL.
--*/
{
NTSTATUS status;
PMMPTE LocalPrototypePte;
PVOID StartingVa;
PFN_NUMBER MdlPages;
KIRQL OldIrql;
MMPTE PteContents;
PFN_NUMBER PageFrameIndex;
PFN_NUMBER ResidentAvailableCharge;
PPFN_NUMBER IoPage;
PPFN_NUMBER ApiPage;
PPFN_NUMBER Page;
PPFN_NUMBER DestinationPage;
ULONG PageColor;
PMMPTE PointerPte;
PMMPTE *ProtoPteArray;
PMMPTE *EndProtoPteArray;
PFN_NUMBER DummyPage;
PMDL Mdl;
PMDL FreeMdl;
PMMPFN PfnProto;
PMMPFN Pfn1;
PMMPFN DummyPfn1;
ULONG i;
PFN_NUMBER DummyTrim;
ULONG NumberOfPagesNeedingIo;
MMPTE TempPte;
PMMPTE PointerPde;
PEPROCESS CurrentProcess;
PMMINPAGE_SUPPORT InPageSupport;
PKPRCB Prcb;
ASSERT (KeGetCurrentIrql() == PASSIVE_LEVEL);
MiReadInfo->DummyPagePfn = NULL;
FreeMdl = NULL;
CurrentProcess = PsGetCurrentProcess();
PfnProto = NULL;
PointerPde = NULL;
InPageSupport = MiReadInfo->InPageSupport;
Mdl = MI_EXTRACT_PREFETCH_MDL (InPageSupport);
ASSERT (Mdl == MiReadInfo->IoMdl);
IoPage = (PPFN_NUMBER)(Mdl + 1);
ApiPage = (PPFN_NUMBER)(MiReadInfo->ApiMdl + 1);
StartingVa = (PVOID)((PCHAR)Mdl->StartVa + Mdl->ByteOffset);
MdlPages = ADDRESS_AND_SIZE_TO_SPAN_PAGES (StartingVa,
Mdl->ByteCount);
if (MdlPages + 1 > MAXUSHORT) {
//
// The PFN ReferenceCount for the dummy page could wrap, refuse the
// request.
//
return STATUS_INSUFFICIENT_RESOURCES;
}
NumberOfPagesNeedingIo = 0;
ProtoPteArray = (PMMPTE *)InPageSupport->BasePte;
EndProtoPteArray = ProtoPteArray + MdlPages;
ASSERT (*ProtoPteArray != NULL);
LOCK_PFN (OldIrql);
//
// Ensure sufficient pages exist for the transfer plus the dummy page.
//
if (((SPFN_NUMBER)MdlPages > (SPFN_NUMBER)(MmAvailablePages - MM_HIGH_LIMIT)) ||
(MI_NONPAGEABLE_MEMORY_AVAILABLE() <= (SPFN_NUMBER)MdlPages)) {
UNLOCK_PFN (OldIrql);
return STATUS_INSUFFICIENT_RESOURCES;
}
//
// Charge resident available immediately as the PFN lock may get released
// and reacquired below before all the pages have been locked down.
// Note the dummy page is immediately charged separately.
//
MI_DECREMENT_RESIDENT_AVAILABLE (MdlPages, MM_RESAVAIL_ALLOCATE_BUILDMDL);
ResidentAvailableCharge = MdlPages;
//
// Allocate a dummy page to map discarded pages that aren't skipped.
//
DummyPage = MiRemoveAnyPage (0);
Pfn1 = MI_PFN_ELEMENT (DummyPage);
ASSERT (Pfn1->u2.ShareCount == 0);
ASSERT (Pfn1->u3.e2.ReferenceCount == 0);
MiInitializePfnForOtherProcess (DummyPage, MI_PF_DUMMY_PAGE_PTE, 0);
//
// Give the page a containing frame so MiIdentifyPfn won't crash.
//
Pfn1->u4.PteFrame = PsInitialSystemProcess->Pcb.DirectoryTableBase[0] >> PAGE_SHIFT;
//
// Always bias the reference count by 1 and charge for this locked page
// up front so the myriad increments and decrements don't get slowed
// down with needless checking.
//
Pfn1->u3.e1.PrototypePte = 0;
MI_ADD_LOCKED_PAGE_CHARGE (Pfn1);
Pfn1->u3.e1.ReadInProgress = 1;
MiReadInfo->DummyPagePfn = Pfn1;
DummyPfn1 = Pfn1;
DummyPfn1->u3.e2.ReferenceCount =
(USHORT)(DummyPfn1->u3.e2.ReferenceCount + MdlPages);
//
// Properly initialize the inpage support block fields we overloaded.
//
InPageSupport->BasePte = *ProtoPteArray;
//
// Build the proper InPageSupport and MDL to describe this run.
//
for (; ProtoPteArray < EndProtoPteArray; ProtoPteArray += 1, IoPage += 1, ApiPage += 1) {
//
// Fill the MDL entry for this RLE.
//
PointerPte = *ProtoPteArray;
ASSERT (PointerPte != NULL);
//
// The PointerPte better be inside a prototype PTE allocation
// so that subsequent page trims update the correct PTEs.
//
ASSERT (((PointerPte >= (PMMPTE)MmPagedPoolStart) &&
(PointerPte <= (PMMPTE)MmPagedPoolEnd)) ||
((PointerPte >= (PMMPTE)MmSpecialPoolStart) && (PointerPte <= (PMMPTE)MmSpecialPoolEnd)));
//
// Check the state of this prototype PTE now that the PFN lock is held.
// If the page is not resident, the PTE must be put in transition with
// read in progress before the PFN lock is released.
//
//
// Lock page containing prototype PTEs in memory by
// incrementing the reference count for the page.
// Unlock any page locked earlier containing prototype PTEs if
// the containing page is not the same for both.
//
if (PfnProto != NULL) {
if (PointerPde != MiGetPteAddress (PointerPte)) {
ASSERT (PfnProto->u3.e2.ReferenceCount > 1);
MI_REMOVE_LOCKED_PAGE_CHARGE_AND_DECREF (PfnProto);
PfnProto = NULL;
}
}
if (PfnProto == NULL) {
ASSERT (!MI_IS_PHYSICAL_ADDRESS (PointerPte));
PointerPde = MiGetPteAddress (PointerPte);
if (PointerPde->u.Hard.Valid == 0) {
MiMakeSystemAddressValidPfn (PointerPte, OldIrql);
}
PfnProto = MI_PFN_ELEMENT (PointerPde->u.Hard.PageFrameNumber);
MI_ADD_LOCKED_PAGE_CHARGE (PfnProto);
ASSERT (PfnProto->u3.e2.ReferenceCount > 1);
}
recheck:
PteContents = *PointerPte;
// LWFIX: are zero or dzero ptes possible here ?
ASSERT (PteContents.u.Long != 0);
if (PteContents.u.Hard.Valid == 1) {
PageFrameIndex = MI_GET_PAGE_FRAME_FROM_PTE (&PteContents);
Pfn1 = MI_PFN_ELEMENT (PageFrameIndex);
ASSERT (Pfn1->u3.e1.PrototypePte == 1);
MI_ADD_LOCKED_PAGE_CHARGE (Pfn1);
*ApiPage = PageFrameIndex;
*IoPage = DummyPage;
continue;
}
if ((PteContents.u.Soft.Prototype == 0) &&
(PteContents.u.Soft.Transition == 1)) {
//
// The page is in transition. If there is an inpage still in
// progress, wait for it to complete. Reference the PFN and
// then march on.
//
PageFrameIndex = MI_GET_PAGE_FRAME_FROM_TRANSITION_PTE (&PteContents);
Pfn1 = MI_PFN_ELEMENT (PageFrameIndex);
ASSERT (Pfn1->u3.e1.PrototypePte == 1);
if (Pfn1->u4.InPageError) {
//
// There was an in-page read error and there are other
// threads colliding for this page, delay to let the
// other threads complete and then retry.
//
UNLOCK_PFN (OldIrql);
KeDelayExecutionThread (KernelMode, FALSE, (PLARGE_INTEGER)&MmHalfSecond);
LOCK_PFN (OldIrql);
goto recheck;
}
if (Pfn1->u3.e1.ReadInProgress) {
// LWFIX - start with temp\aw.c
}
//
// PTE refers to a normal transition PTE.
//
ASSERT ((SPFN_NUMBER)MmAvailablePages >= 0);
if (MmAvailablePages == 0) {
//
// This can only happen if the system is utilizing a hardware
// compression cache. This ensures that only a safe amount
// of the compressed virtual cache is directly mapped so that
// if the hardware gets into trouble, we can bail it out.
//
UNLOCK_PFN (OldIrql);
KeDelayExecutionThread (KernelMode, FALSE, (PLARGE_INTEGER)&MmHalfSecond);
LOCK_PFN (OldIrql);
goto recheck;
}
//
// The PFN reference count will be 1 already here if the
// modified writer has begun a write of this page. Otherwise
// it's ordinarily 0.
//
MI_ADD_LOCKED_PAGE_CHARGE_FOR_MODIFIED_PAGE (Pfn1);
*IoPage = DummyPage;
*ApiPage = PageFrameIndex;
continue;
}
// LWFIX: need to handle protos that are now pagefile (or dzero)
// backed - prefetching it from the file here would cause us to lose
// the contents. Note this can happen for session-space images
// as we back modified (ie: for relocation fixups or IAT
// updated) portions from the pagefile. remove the assert below too.
ASSERT (PteContents.u.Soft.Prototype == 1);
if ((MmAvailablePages < MM_HIGH_LIMIT) &&
(MiEnsureAvailablePageOrWait (NULL, OldIrql))) {
//
// Had to wait so recheck all state.
//
goto recheck;
}
NumberOfPagesNeedingIo += 1;
//
// Allocate a physical page.
//
PageColor = MI_PAGE_COLOR_VA_PROCESS (
MiGetVirtualAddressMappedByPte (PointerPte),
&CurrentProcess->NextPageColor);
PageFrameIndex = MiRemoveAnyPage (PageColor);
Pfn1 = MI_PFN_ELEMENT (PageFrameIndex);
ASSERT (Pfn1->u3.e2.ReferenceCount == 0);
ASSERT (Pfn1->u2.ShareCount == 0);
ASSERT (PointerPte->u.Hard.Valid == 0);
//
// Initialize read-in-progress PFN.
//
MiInitializePfn (PageFrameIndex, PointerPte, 0);
//
// These pieces of MiInitializePfn initialization are overridden
// here as these pages are only going into prototype
// transition and not into any page tables.
//
Pfn1->u3.e1.PrototypePte = 1;
Pfn1->u2.ShareCount -= 1;
ASSERT (Pfn1->u2.ShareCount == 0);
Pfn1->u3.e1.PageLocation = ZeroedPageList;
Pfn1->u3.e2.ReferenceCount -= 1;
ASSERT (Pfn1->u3.e2.ReferenceCount == 0);
MI_ADD_LOCKED_PAGE_CHARGE_FOR_MODIFIED_PAGE (Pfn1);
//
// Initialize the I/O specific fields.
//
Pfn1->u1.Event = &InPageSupport->Event;
Pfn1->u3.e1.ReadInProgress = 1;
ASSERT (Pfn1->u4.InPageError == 0);
//
// Increment the PFN reference count in the control area for
// the subsection.
//
MiReadInfo->ControlArea->NumberOfPfnReferences += 1;
//
// Put the prototype PTE into the transition state.
//
MI_MAKE_TRANSITION_PTE (TempPte,
PageFrameIndex,
PointerPte->u.Soft.Protection,
PointerPte);
MI_WRITE_INVALID_PTE (PointerPte, TempPte);
*IoPage = PageFrameIndex;
*ApiPage = PageFrameIndex;
}
//
// If all the pages were resident, dereference the dummy page references
// now and notify our caller that I/O is not necessary.
//
if (NumberOfPagesNeedingIo == 0) {
ASSERT (DummyPfn1->u3.e2.ReferenceCount > MdlPages);
DummyPfn1->u3.e2.ReferenceCount =
(USHORT)(DummyPfn1->u3.e2.ReferenceCount - MdlPages);
//
// Unlock page containing prototype PTEs.
//
if (PfnProto != NULL) {
ASSERT (PfnProto->u3.e2.ReferenceCount > 1);
MI_REMOVE_LOCKED_PAGE_CHARGE_AND_DECREF (PfnProto);
}
UNLOCK_PFN (OldIrql);
//
// Return the upfront resident available charge as the
// individual charges have all been made at this point.
//
MI_INCREMENT_RESIDENT_AVAILABLE (ResidentAvailableCharge,
MM_RESAVAIL_FREE_BUILDMDL_EXCESS);
return STATUS_SUCCESS;
}
//
// Carefully trim leading dummy pages.
//
Page = (PPFN_NUMBER)(Mdl + 1);
DummyTrim = 0;
for (i = 0; i < MdlPages - 1; i += 1) {
if (*Page == DummyPage) {
DummyTrim += 1;
Page += 1;
}
else {
break;
}
}
if (DummyTrim != 0) {
Mdl->Size = (USHORT)(Mdl->Size - (DummyTrim * sizeof(PFN_NUMBER)));
Mdl->ByteCount -= (ULONG)(DummyTrim * PAGE_SIZE);
ASSERT (Mdl->ByteCount != 0);
InPageSupport->ReadOffset.QuadPart += (DummyTrim * PAGE_SIZE);
DummyPfn1->u3.e2.ReferenceCount =
(USHORT)(DummyPfn1->u3.e2.ReferenceCount - DummyTrim);
//
// Shuffle down the PFNs in the MDL.
// Recalculate BasePte to adjust for the shuffle.
//
Pfn1 = MI_PFN_ELEMENT (*Page);
ASSERT (Pfn1->PteAddress->u.Hard.Valid == 0);
ASSERT ((Pfn1->PteAddress->u.Soft.Prototype == 0) &&
(Pfn1->PteAddress->u.Soft.Transition == 1));
InPageSupport->BasePte = Pfn1->PteAddress;
DestinationPage = (PPFN_NUMBER)(Mdl + 1);
do {
*DestinationPage = *Page;
DestinationPage += 1;
Page += 1;
i += 1;
} while (i < MdlPages);
MdlPages -= DummyTrim;
}
//
// Carefully trim trailing dummy pages.
//
ASSERT (MdlPages != 0);
Page = (PPFN_NUMBER)(Mdl + 1) + MdlPages - 1;
if (*Page == DummyPage) {
ASSERT (MdlPages >= 2);
//
// Trim the last page specially as it may be a partial page.
//
Mdl->Size -= sizeof(PFN_NUMBER);
if (BYTE_OFFSET(Mdl->ByteCount) != 0) {
Mdl->ByteCount &= ~(PAGE_SIZE - 1);
}
else {
Mdl->ByteCount -= PAGE_SIZE;
}
ASSERT (Mdl->ByteCount != 0);
DummyPfn1->u3.e2.ReferenceCount -= 1;
//
// Now trim any other trailing pages.
//
Page -= 1;
DummyTrim = 0;
while (Page != ((PPFN_NUMBER)(Mdl + 1))) {
if (*Page != DummyPage) {
break;
}
DummyTrim += 1;
Page -= 1;
}
if (DummyTrim != 0) {
ASSERT (Mdl->Size > (USHORT)(DummyTrim * sizeof(PFN_NUMBER)));
Mdl->Size = (USHORT)(Mdl->Size - (DummyTrim * sizeof(PFN_NUMBER)));
Mdl->ByteCount -= (ULONG)(DummyTrim * PAGE_SIZE);
DummyPfn1->u3.e2.ReferenceCount =
(USHORT)(DummyPfn1->u3.e2.ReferenceCount - DummyTrim);
}
ASSERT (MdlPages > DummyTrim + 1);
MdlPages -= (DummyTrim + 1);
#if DBG
StartingVa = (PVOID)((PCHAR)Mdl->StartVa + Mdl->ByteOffset);
ASSERT (MdlPages == ADDRESS_AND_SIZE_TO_SPAN_PAGES(StartingVa,
Mdl->ByteCount));
#endif
}
//
// If the MDL is not already embedded in the inpage block, see if its
// final size qualifies it - if so, embed it now.
//
if ((Mdl != &InPageSupport->Mdl) &&
(Mdl->ByteCount <= (MM_MAXIMUM_READ_CLUSTER_SIZE + 1) * PAGE_SIZE)){
#if DBG
RtlFillMemoryUlong (&InPageSupport->Page[0],
(MM_MAXIMUM_READ_CLUSTER_SIZE+1) * sizeof (PFN_NUMBER),
0xf1f1f1f1);
#endif
RtlCopyMemory (&InPageSupport->Mdl, Mdl, Mdl->Size);
FreeMdl = Mdl;
Mdl = &InPageSupport->Mdl;
ASSERT (((ULONG_PTR)Mdl & (sizeof(QUAD) - 1)) == 0);
InPageSupport->u1.e1.PrefetchMdlHighBits = ((ULONG_PTR)Mdl >> 3);
}
void
RosKmAdapter::ProcessPagingBuffer(
ROSDMABUFSUBMISSION * pDmaBufSubmission)
{
ROSDMABUFINFO * pDmaBufInfo = pDmaBufSubmission->m_pDmaBufInfo;
NT_ASSERT(0 == (pDmaBufSubmission->m_EndOffset - pDmaBufSubmission->m_StartOffset) % sizeof(DXGKARG_BUILDPAGINGBUFFER));
DXGKARG_BUILDPAGINGBUFFER * pPagingBuffer = (DXGKARG_BUILDPAGINGBUFFER *)(pDmaBufInfo->m_pDmaBuffer + pDmaBufSubmission->m_StartOffset);
DXGKARG_BUILDPAGINGBUFFER * pEndofBuffer = (DXGKARG_BUILDPAGINGBUFFER *)(pDmaBufInfo->m_pDmaBuffer + pDmaBufSubmission->m_EndOffset);
for (; pPagingBuffer < pEndofBuffer; pPagingBuffer++)
{
switch (pPagingBuffer->Operation)
{
case DXGK_OPERATION_FILL:
{
NT_ASSERT(pPagingBuffer->Fill.Destination.SegmentId == ROSD_SEGMENT_VIDEO_MEMORY);
RtlFillMemoryUlong(
((BYTE *)RosKmdGlobal::s_pVideoMemory) + pPagingBuffer->Fill.Destination.SegmentAddress.QuadPart,
pPagingBuffer->Fill.FillSize,
pPagingBuffer->Fill.FillPattern);
}
break;
case DXGK_OPERATION_TRANSFER:
{
PBYTE pSource, pDestination;
MDL * pMdlToRestore = NULL;
CSHORT savedMdlFlags = 0;
PBYTE pKmAddrToUnmap = NULL;
if (pPagingBuffer->Transfer.Source.SegmentId == ROSD_SEGMENT_VIDEO_MEMORY)
{
pSource = ((BYTE *)RosKmdGlobal::s_pVideoMemory) + pPagingBuffer->Transfer.Source.SegmentAddress.QuadPart;
}
else
{
NT_ASSERT(pPagingBuffer->Transfer.Source.SegmentId == 0);
pMdlToRestore = pPagingBuffer->Transfer.Source.pMdl;
savedMdlFlags = pMdlToRestore->MdlFlags;
pSource = (PBYTE)MmGetSystemAddressForMdlSafe(pPagingBuffer->Transfer.Source.pMdl, HighPagePriority);
pKmAddrToUnmap = pSource;
// Adjust the source address by MdlOffset
pSource += (pPagingBuffer->Transfer.MdlOffset*PAGE_SIZE);
}
if (pPagingBuffer->Transfer.Destination.SegmentId == ROSD_SEGMENT_VIDEO_MEMORY)
{
pDestination = ((BYTE *)RosKmdGlobal::s_pVideoMemory) + pPagingBuffer->Transfer.Destination.SegmentAddress.QuadPart;
}
else
{
NT_ASSERT(pPagingBuffer->Transfer.Destination.SegmentId == 0);
pMdlToRestore = pPagingBuffer->Transfer.Destination.pMdl;
savedMdlFlags = pMdlToRestore->MdlFlags;
pDestination = (PBYTE)MmGetSystemAddressForMdlSafe(pPagingBuffer->Transfer.Destination.pMdl, HighPagePriority);
pKmAddrToUnmap = pDestination;
// Adjust the destination address by MdlOffset
pDestination += (pPagingBuffer->Transfer.MdlOffset*PAGE_SIZE);
}
if (pSource && pDestination)
{
RtlCopyMemory(pDestination, pSource, pPagingBuffer->Transfer.TransferSize);
}
else
{
// TODO[indyz]: Propagate the error back to runtime
m_ErrorHit.m_PagingFailure = 1;
}
// Restore the state of the Mdl (for source or destionation)
if ((0 == (savedMdlFlags & MDL_MAPPED_TO_SYSTEM_VA)) && pKmAddrToUnmap)
{
MmUnmapLockedPages(pKmAddrToUnmap, pMdlToRestore);
}
}
break;
default:
NT_ASSERT(false);
}
}
}
