static
VOID
MmDeletePageTablePfn(PFN_NUMBER PageFrameNumber, ULONG Level)
{
PMMPTE PageTable;
KIRQL OldIrql;
PMMPFN PfnEntry;
ULONG i, NumberEntries;
/* Check if this is a page table */
if (Level > 0)
{
NumberEntries = (Level == 4) ? MiAddressToPxi(MmHighestUserAddress)+1 : 512;
/* Map the page table in hyperspace */
PageTable = (PMMPTE)MmCreateHyperspaceMapping(PageFrameNumber);
/* Loop all page table entries */
for (i = 0; i < NumberEntries; i++)
{
/* Check if the entry is valid */
if (PageTable[i].u.Hard.Valid)
{
/* Recursively free the page that backs it */
MmDeletePageTablePfn(PageTable[i].u.Hard.PageFrameNumber, Level - 1);
}
}
/* Delete the hyperspace mapping */
MmDeleteHyperspaceMapping(PageTable);
}
/* Check if this is a legacy allocation */
PfnEntry = MiGetPfnEntry(PageFrameNumber);
if (MI_IS_ROS_PFN(PfnEntry))
{
/* Free it using the legacy API */
MmReleasePageMemoryConsumer(MC_SYSTEM, PageFrameNumber);
}
else
{
OldIrql = KeAcquireQueuedSpinLock(LockQueuePfnLock);
/* Free it using the ARM3 API */
MI_SET_PFN_DELETED(PfnEntry);
MiDecrementShareCount(PfnEntry, PageFrameNumber);
KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
}
}
NTSTATUS
NTAPI
_MiWriteBackPage
(PFILE_OBJECT FileObject,
PLARGE_INTEGER FileOffset,
ULONG Length,
PFN_NUMBER Page,
const char *File,
int Line)
{
NTSTATUS Status;
PVOID Hyperspace;
IO_STATUS_BLOCK Iosb;
KIRQL OldIrql;
PVOID PageBuffer = ExAllocatePool(NonPagedPool, PAGE_SIZE);
if (!PageBuffer) return STATUS_NO_MEMORY;
KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
Hyperspace = MmCreateHyperspaceMapping(Page);
RtlCopyMemory(PageBuffer, Hyperspace, PAGE_SIZE);
MmDeleteHyperspaceMapping(Hyperspace);
KeLowerIrql(OldIrql);
DPRINT1("MiWriteBackPage(%wZ,%08x%08x,%s:%d)\n", &FileObject->FileName, FileOffset->u.HighPart, FileOffset->u.LowPart, File, Line);
Status = MiSimpleWrite
(FileObject,
FileOffset,
PageBuffer,
Length,
&Iosb);
ExFreePool(PageBuffer);
if (!NT_SUCCESS(Status))
{
DPRINT1("MiSimpleWrite failed (%x)\n", Status);
}
return Status;
}
