127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
/*++
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Copyright (c) 1989 Microsoft Corporation
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Copyright (c) 1992 Digital Equipment Corporation
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Module Name:
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setdirty.c
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Abstract:
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This module contains the setting dirty bit routine for memory management.
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ALPHA specific.
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Author:
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Lou Perazzoli (loup) 10-Apr-1990.
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Joe Notarangelo 23-Apr-1992 ALPHA version
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Revision History:
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--*/
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#include "mi.h"
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VOID
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MiSetDirtyBit (
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IN PVOID FaultingAddress,
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IN PMMPTE PointerPte,
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IN ULONG PfnHeld
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)
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/*++
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Routine Description:
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This routine sets dirty in the specified PTE and the modify bit in the
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correpsonding PFN element. If any page file space is allocated, it
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is deallocated.
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Arguments:
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FaultingAddress - Supplies the faulting address.
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PointerPte - Supplies a pointer to the corresponding valid PTE.
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PfnHeld - Supplies TRUE if the PFN mutex is already held.
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Return Value:
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None.
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Environment:
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Kernel mode, APC's disabled, Working set mutex held.
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--*/
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{
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MMPTE TempPte;
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ULONG PageFrameIndex;
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PMMPFN Pfn1;
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KIRQL OldIrql;
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//
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// The TB entry must be flushed as the valid PTE with the dirty bit clear
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// has been fetched into the TB. If it isn't flushed, another fault
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// is generated as the dirty bit is not set in the cached TB entry.
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//
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// KiFlushSingleDataTb( FaultingAddress );
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__dtbis( FaultingAddress );
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//
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// The page is NOT copy on write, update the PTE setting both the
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// dirty bit and the accessed bit. Note, that as this PTE is in
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// the TB, the TB must be flushed.
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//
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PageFrameIndex = PointerPte->u.Hard.PageFrameNumber;
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Pfn1 = MI_PFN_ELEMENT (PageFrameIndex);
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TempPte = *PointerPte;
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TempPte.u.Hard.Dirty = 1;
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MI_SET_ACCESSED_IN_PTE (&TempPte, 1);
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*PointerPte = TempPte;
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//
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// If the PFN database lock is not held, then do not update the
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// PFN database.
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//
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if (PfnHeld) {
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//
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// Set the modified field in the PFN database, also, if the physical
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// page is currently in a paging file, free up the page file space
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// as the contents are now worthless.
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//
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if ( (Pfn1->OriginalPte.u.Soft.Prototype == 0) &&
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(Pfn1->u3.e1.WriteInProgress == 0) ) {
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//
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// This page is in page file format, deallocate the page file space.
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//
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MiReleasePageFileSpace (Pfn1->OriginalPte);
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//
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// Change original PTE to indicate no page file space is reserved,
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// otherwise the space will be deallocated when the PTE is
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// deleted.
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//
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Pfn1->OriginalPte.u.Soft.PageFileHigh = 0;
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}
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Pfn1->u3.e1.Modified = 1;
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}
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return;
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}
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