145 lines
2.8 KiB
C
145 lines
2.8 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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setmodfy.c
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Abstract:
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This module contains the setting modify bit routine for memory management.
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i386 specific.
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Author:
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10-Apr-1989
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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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MiSetModifyBit (
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IN PMMPFN Pfn
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)
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/*++
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Routine Description:
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This routine sets the modify bit in the specified PFN element
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and deallocates any allocated page file space.
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Arguments:
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Pfn - Supplies the pointer to the PFN element to update.
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Return Value:
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None.
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Environment:
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Kernel mode, APCs disabled, Working set mutex held and PFN lock held.
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--*/
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{
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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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MI_SET_MODIFIED (Pfn, 1, 0x16);
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if (Pfn->OriginalPte.u.Soft.Prototype == 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 (Pfn->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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Pfn->OriginalPte.u.Soft.PageFileHigh = 0;
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}
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return;
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}
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ULONG
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FASTCALL
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MiDetermineUserGlobalPteMask (
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IN PMMPTE Pte
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)
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/*++
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Routine Description:
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Builds a mask to OR with the PTE frame field.
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This mask has the valid and access bits set and
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has the global and owner bits set based on the
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address of the PTE.
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******************* NOTE *********************************************
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THIS ROUTINE DOES NOT CHECK FOR PDEs WHICH NEED TO BE
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SET GLOBAL AS IT ASSUMES PDEs FOR SYSTEM SPACE ARE
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PROPERLY SET AT INITIALIZATION TIME!
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Arguments:
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Pte - Supplies a pointer to the PTE in which to fill.
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Return Value:
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Mask to OR into the frame to make a valid PTE.
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Environment:
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Kernel mode, 386 specific.
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--*/
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{
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MMPTE Mask;
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Mask.u.Long = 0;
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Mask.u.Hard.Valid = 1;
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Mask.u.Hard.Accessed = 1;
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if (Pte <= MiHighestUserPte) {
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Mask.u.Hard.Owner = 1;
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} else if ((Pte < MiGetPteAddress (PTE_BASE)) ||
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(Pte >= MiGetPteAddress (MM_SYSTEM_CACHE_WORKING_SET))) {
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if (MI_IS_SESSION_PTE (Pte) == FALSE) {
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#if defined (_X86PAE_)
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if ((Pte < (PMMPTE)PDE_BASE) || (Pte > (PMMPTE)PDE_TOP))
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#endif
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Mask.u.Long |= MmPteGlobal.u.Long;
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}
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} else if ((Pte >= MiGetPdeAddress (NULL)) && (Pte <= MiHighestUserPde)) {
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Mask.u.Hard.Owner = 1;
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}
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//
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// Since the valid, accessed, global and owner bits are always in the
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// low dword of the PTE, returning a ULONG is ok.
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//
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return (ULONG)Mask.u.Long;
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}
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