NTSTATUS
NTAPI
_MmSetPageEntrySectionSegment(PMM_SECTION_SEGMENT Segment,
PLARGE_INTEGER Offset,
ULONG_PTR Entry,
const char *file,
int line)
{
ULONG_PTR PageIndex, OldEntry;
PCACHE_SECTION_PAGE_TABLE PageTable;
ASSERT(Segment->Locked);
ASSERT(!IS_SWAP_FROM_SSE(Entry) || !IS_DIRTY_SSE(Entry));
if (Entry && !IS_SWAP_FROM_SSE(Entry))
MmGetRmapListHeadPage(PFN_FROM_SSE(Entry));
PageTable = MiSectionPageTableGetOrAllocate(&Segment->PageTable, Offset);
if (!PageTable) return STATUS_NO_MEMORY;
ASSERT(MiSectionPageTableGet(&Segment->PageTable, Offset));
PageTable->Segment = Segment;
PageIndex = (ULONG_PTR)((Offset->QuadPart - PageTable->FileOffset.QuadPart) / PAGE_SIZE);
OldEntry = PageTable->PageEntries[PageIndex];
DPRINT("MiSetPageEntrySectionSegment(%p,%08x%08x,%x=>%x)\n",
Segment,
Offset->u.HighPart,
Offset->u.LowPart,
OldEntry,
Entry);
if (PFN_FROM_SSE(Entry) == PFN_FROM_SSE(OldEntry)) {
/* Nothing */
} else if (Entry && !IS_SWAP_FROM_SSE(Entry)) {
ASSERT(!OldEntry || IS_SWAP_FROM_SSE(OldEntry));
MmSetSectionAssociation(PFN_FROM_SSE(Entry), Segment, Offset);
} else if (OldEntry && !IS_SWAP_FROM_SSE(OldEntry)) {
ASSERT(!Entry || IS_SWAP_FROM_SSE(Entry));
MmDeleteSectionAssociation(PFN_FROM_SSE(OldEntry));
} else if (IS_SWAP_FROM_SSE(Entry)) {
ASSERT(!IS_SWAP_FROM_SSE(OldEntry) ||
SWAPENTRY_FROM_SSE(OldEntry) == MM_WAIT_ENTRY);
if (OldEntry && SWAPENTRY_FROM_SSE(OldEntry) != MM_WAIT_ENTRY)
MmDeleteSectionAssociation(PFN_FROM_SSE(OldEntry));
} else if (IS_SWAP_FROM_SSE(OldEntry)) {
ASSERT(!IS_SWAP_FROM_SSE(Entry));
if (Entry)
MmSetSectionAssociation(PFN_FROM_SSE(OldEntry), Segment, Offset);
} else {
/* We should not be replacing a page like this */
ASSERT(FALSE);
}
PageTable->PageEntries[PageIndex] = Entry;
return STATUS_SUCCESS;
}
ULONG
NTAPI
MiCacheEvictPages(PMM_SECTION_SEGMENT Segment,
ULONG Target)
{
ULONG_PTR Entry;
ULONG Result = 0, i, j;
NTSTATUS Status;
PFN_NUMBER Page;
LARGE_INTEGER Offset;
MmLockSectionSegment(Segment);
for (i = 0; i < RtlNumberGenericTableElements(&Segment->PageTable); i++) {
PCACHE_SECTION_PAGE_TABLE Element = RtlGetElementGenericTable(&Segment->PageTable,
i);
ASSERT(Element);
Offset = Element->FileOffset;
for (j = 0; j < ENTRIES_PER_ELEMENT; j++, Offset.QuadPart += PAGE_SIZE) {
Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
if (Entry && !IS_SWAP_FROM_SSE(Entry)) {
Page = PFN_FROM_SSE(Entry);
MmUnlockSectionSegment(Segment);
Status = MmpPageOutPhysicalAddress(Page);
if (NT_SUCCESS(Status))
Result++;
MmLockSectionSegment(Segment);
}
}
}
MmUnlockSectionSegment(Segment);
return Result;
}
NTSTATUS
NTAPI
MiCowCacheSectionPage (
_In_ PMMSUPPORT AddressSpace,
_In_ PMEMORY_AREA MemoryArea,
_In_ PVOID Address,
_In_ BOOLEAN Locked,
_Inout_ PMM_REQUIRED_RESOURCES Required)
{
PMM_SECTION_SEGMENT Segment;
PFN_NUMBER NewPage, OldPage;
NTSTATUS Status;
PVOID PAddress;
LARGE_INTEGER Offset;
PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
DPRINT("MmAccessFaultSectionView(%p, %p, %p, %u)\n",
AddressSpace,
MemoryArea,
Address,
Locked);
Segment = MemoryArea->Data.SectionData.Segment;
/* Lock the segment */
MmLockSectionSegment(Segment);
/* Find the offset of the page */
PAddress = MM_ROUND_DOWN(Address, PAGE_SIZE);
Offset.QuadPart = (ULONG_PTR)PAddress - (ULONG_PTR)MemoryArea->StartingAddress +
MemoryArea->Data.SectionData.ViewOffset.QuadPart;
if (!Segment->WriteCopy /*&&
!MemoryArea->Data.SectionData.WriteCopyView*/ ||
Segment->Image.Characteristics & IMAGE_SCN_MEM_SHARED)
{
#if 0
if (Region->Protect == PAGE_READWRITE ||
Region->Protect == PAGE_EXECUTE_READWRITE)
#endif
{
ULONG_PTR Entry;
DPRINTC("setting non-cow page %p %p:%p offset %I64x (%Ix) to writable\n",
Segment,
Process,
PAddress,
Offset.QuadPart,
MmGetPfnForProcess(Process, Address));
if (Segment->FileObject)
{
DPRINTC("file %wZ\n", &Segment->FileObject->FileName);
}
Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
DPRINT("Entry %x\n", Entry);
if (Entry &&
!IS_SWAP_FROM_SSE(Entry) &&
PFN_FROM_SSE(Entry) == MmGetPfnForProcess(Process, Address)) {
MmSetPageEntrySectionSegment(Segment,
&Offset,
DIRTY_SSE(Entry));
}
MmSetPageProtect(Process, PAddress, PAGE_READWRITE);
MmSetDirtyPage(Process, PAddress);
MmUnlockSectionSegment(Segment);
DPRINT("Done\n");
return STATUS_SUCCESS;
}
#if 0
else
{
DPRINT("Not supposed to be writable\n");
MmUnlockSectionSegment(Segment);
return STATUS_ACCESS_VIOLATION;
}
#endif
}
if (!Required->Page[0])
{
SWAPENTRY SwapEntry;
if (MmIsPageSwapEntry(Process, Address))
{
MmGetPageFileMapping(Process, Address, &SwapEntry);
MmUnlockSectionSegment(Segment);
if (SwapEntry == MM_WAIT_ENTRY)
return STATUS_SUCCESS + 1; // Wait ... somebody else is getting it right now
else
return STATUS_SUCCESS; // Nonwait swap entry ... handle elsewhere
}
/* Call out to acquire a page to copy to. We'll be re-called when
* the page has been allocated. */
Required->Page[1] = MmGetPfnForProcess(Process, Address);
Required->Consumer = MC_CACHE;
Required->Amount = 1;
Required->File = __FILE__;
Required->Line = __LINE__;
Required->DoAcquisition = MiGetOnePage;
MmCreatePageFileMapping(Process, Address, MM_WAIT_ENTRY);
MmUnlockSectionSegment(Segment);
return STATUS_MORE_PROCESSING_REQUIRED;
}
NewPage = Required->Page[0];
OldPage = Required->Page[1];
DPRINT("Allocated page %x\n", NewPage);
/* Unshare the old page */
MmDeleteRmap(OldPage, Process, PAddress);
/* Copy the old page */
DPRINT("Copying\n");
MiCopyPageToPage(NewPage, OldPage);
/* Set the PTE to point to the new page */
Status = MmCreateVirtualMapping(Process,
Address,
PAGE_READWRITE,
&NewPage,
1);
if (!NT_SUCCESS(Status))
{
DPRINT1("MmCreateVirtualMapping failed, not out of memory\n");
ASSERT(FALSE);
MmUnlockSectionSegment(Segment);
return Status;
}
MmInsertRmap(NewPage, Process, PAddress);
MmReleasePageMemoryConsumer(MC_CACHE, OldPage);
MmUnlockSectionSegment(Segment);
DPRINT("Address 0x%p\n", Address);
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
MmNotPresentFaultCachePage (
_In_ PMMSUPPORT AddressSpace,
_In_ MEMORY_AREA* MemoryArea,
_In_ PVOID Address,
_In_ BOOLEAN Locked,
_Inout_ PMM_REQUIRED_RESOURCES Required)
{
NTSTATUS Status;
PVOID PAddress;
ULONG Consumer;
PMM_SECTION_SEGMENT Segment;
LARGE_INTEGER FileOffset, TotalOffset;
ULONG_PTR Entry;
ULONG Attributes;
PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
KIRQL OldIrql;
DPRINT("Not Present: %p %p (%p-%p)\n",
AddressSpace,
Address,
MemoryArea->StartingAddress,
MemoryArea->EndingAddress);
/*
* There is a window between taking the page fault and locking the
* address space when another thread could load the page so we check
* that.
*/
if (MmIsPagePresent(Process, Address))
{
DPRINT("Done\n");
return STATUS_SUCCESS;
}
PAddress = MM_ROUND_DOWN(Address, PAGE_SIZE);
TotalOffset.QuadPart = (ULONG_PTR)PAddress -
(ULONG_PTR)MemoryArea->StartingAddress;
Segment = MemoryArea->Data.SectionData.Segment;
TotalOffset.QuadPart += MemoryArea->Data.SectionData.ViewOffset.QuadPart;
FileOffset = TotalOffset;
//Consumer = (Segment->Flags & MM_DATAFILE_SEGMENT) ? MC_CACHE : MC_USER;
Consumer = MC_CACHE;
if (Segment->FileObject)
{
DPRINT("FileName %wZ\n", &Segment->FileObject->FileName);
}
DPRINT("Total Offset %08x%08x\n", TotalOffset.HighPart, TotalOffset.LowPart);
/* Lock the segment */
MmLockSectionSegment(Segment);
/* Get the entry corresponding to the offset within the section */
Entry = MmGetPageEntrySectionSegment(Segment, &TotalOffset);
Attributes = PAGE_READONLY;
if (Required->State && Required->Page[0])
{
DPRINT("Have file and page, set page %x in section @ %x #\n",
Required->Page[0],
TotalOffset.LowPart);
if (Required->SwapEntry)
MmSetSavedSwapEntryPage(Required->Page[0], Required->SwapEntry);
if (Required->State & 2)
{
DPRINT("Set in section @ %x\n", TotalOffset.LowPart);
Status = MmSetPageEntrySectionSegment(Segment,
&TotalOffset,
Entry = MAKE_PFN_SSE(Required->Page[0]));
if (!NT_SUCCESS(Status))
{
MmReleasePageMemoryConsumer(MC_CACHE, Required->Page[0]);
}
MmUnlockSectionSegment(Segment);
MiSetPageEvent(Process, Address);
DPRINT("Status %x\n", Status);
return STATUS_MM_RESTART_OPERATION;
}
else
{
DPRINT("Set %x in address space @ %p\n", Required->Page[0], Address);
Status = MmCreateVirtualMapping(Process,
Address,
Attributes,
Required->Page,
1);
if (NT_SUCCESS(Status))
{
MmInsertRmap(Required->Page[0], Process, Address);
}
else
{
/* Drop the reference for our address space ... */
MmReleasePageMemoryConsumer(MC_CACHE, Required->Page[0]);
}
MmUnlockSectionSegment(Segment);
DPRINTC("XXX Set Event %x\n", Status);
MiSetPageEvent(Process, Address);
DPRINT("Status %x\n", Status);
return Status;
}
}
else if (MM_IS_WAIT_PTE(Entry))
{
// Whenever MM_WAIT_ENTRY is required as a swap entry, we need to
// ask the fault handler to wait until we should continue. Rathern
// than recopy this boilerplate code everywhere, we just ask them
// to wait.
MmUnlockSectionSegment(Segment);
return STATUS_SUCCESS + 1;
}
else if (Entry)
{
PFN_NUMBER Page = PFN_FROM_SSE(Entry);
DPRINT("Take reference to page %x #\n", Page);
if (MiGetPfnEntry(Page) == NULL)
{
DPRINT1("Found no PFN entry for page 0x%x in page entry 0x%x (segment: 0x%p, offset: %08x%08x)\n",
Page,
Entry,
Segment,
TotalOffset.HighPart,
TotalOffset.LowPart);
KeBugCheck(CACHE_MANAGER);
}
OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
MmReferencePage(Page);
KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
Status = MmCreateVirtualMapping(Process, Address, Attributes, &Page, 1);
if (NT_SUCCESS(Status))
{
MmInsertRmap(Page, Process, Address);
}
DPRINT("XXX Set Event %x\n", Status);
MiSetPageEvent(Process, Address);
MmUnlockSectionSegment(Segment);
DPRINT("Status %x\n", Status);
return Status;
}
else
{
DPRINT("Get page into section\n");
/*
* If the entry is zero (and it can't change because we have
* locked the segment) then we need to load the page.
*/
//DPRINT1("Read from file %08x %wZ\n", FileOffset.LowPart, &Section->FileObject->FileName);
Required->State = 2;
Required->Context = Segment->FileObject;
Required->Consumer = Consumer;
Required->FileOffset = FileOffset;
Required->Amount = PAGE_SIZE;
Required->DoAcquisition = MiReadFilePage;
MmSetPageEntrySectionSegment(Segment,
&TotalOffset,
MAKE_SWAP_SSE(MM_WAIT_ENTRY));
MmUnlockSectionSegment(Segment);
return STATUS_MORE_PROCESSING_REQUIRED;
}
ASSERT(FALSE);
return STATUS_ACCESS_VIOLATION;
}
/*
MmWithdrawSectionPage removes a page entry from the section segment, replacing
it with a wait entry. The caller must replace the wait entry with a 0, when
any required writing is done. The wait entry must remain until the page is
written to protect against cases where a fault brings a stale copy of the page
back before writing is complete.
*/
PFN_NUMBER
NTAPI
MmWithdrawSectionPage(PMM_SECTION_SEGMENT Segment,
PLARGE_INTEGER FileOffset,
BOOLEAN *Dirty)
{
ULONG_PTR Entry;
DPRINT("MmWithdrawSectionPage(%p,%08x%08x,%p)\n",
Segment,
FileOffset->HighPart,
FileOffset->LowPart,
Dirty);
MmLockSectionSegment(Segment);
Entry = MmGetPageEntrySectionSegment(Segment, FileOffset);
*Dirty = !!IS_DIRTY_SSE(Entry);
DPRINT("Withdraw %x (%x) of %wZ\n",
FileOffset->LowPart,
Entry,
Segment->FileObject ? &Segment->FileObject->FileName : NULL);
if (!Entry)
{
DPRINT("Stoeled!\n");
MmUnlockSectionSegment(Segment);
return 0;
}
else if (MM_IS_WAIT_PTE(Entry))
{
DPRINT("WAIT\n");
MmUnlockSectionSegment(Segment);
return MM_WAIT_ENTRY;
}
else if (Entry && !IS_SWAP_FROM_SSE(Entry))
{
DPRINT("Page %x\n", PFN_FROM_SSE(Entry));
*Dirty |= (Entry & 2);
MmSetPageEntrySectionSegment(Segment,
FileOffset,
MAKE_SWAP_SSE(MM_WAIT_ENTRY));
MmUnlockSectionSegment(Segment);
return PFN_FROM_SSE(Entry);
}
else
{
DPRINT1("SWAP ENTRY?! (%p:%08x%08x)\n",
Segment,
FileOffset->HighPart,
FileOffset->LowPart);
ASSERT(FALSE);
MmUnlockSectionSegment(Segment);
return 0;
}
}