145 lines
2.8 KiB
C
145 lines
2.8 KiB
C
/*++
|
||
|
||
Copyright (c) 1989 Microsoft Corporation
|
||
|
||
Module Name:
|
||
|
||
setmodfy.c
|
||
|
||
Abstract:
|
||
|
||
This module contains the setting modify bit routine for memory management.
|
||
|
||
i386 specific.
|
||
|
||
Author:
|
||
|
||
10-Apr-1989
|
||
|
||
Revision History:
|
||
|
||
--*/
|
||
|
||
#include "mi.h"
|
||
|
||
VOID
|
||
MiSetModifyBit (
|
||
IN PMMPFN Pfn
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine sets the modify bit in the specified PFN element
|
||
and deallocates any allocated page file space.
|
||
|
||
Arguments:
|
||
|
||
Pfn - Supplies the pointer to the PFN element to update.
|
||
|
||
Return Value:
|
||
|
||
None.
|
||
|
||
Environment:
|
||
|
||
Kernel mode, APCs disabled, Working set mutex held and PFN lock held.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
//
|
||
// Set the modified field in the PFN database, also, if the physical
|
||
// page is currently in a paging file, free up the page file space
|
||
// as the contents are now worthless.
|
||
//
|
||
|
||
MI_SET_MODIFIED (Pfn, 1, 0x16);
|
||
|
||
if (Pfn->OriginalPte.u.Soft.Prototype == 0) {
|
||
|
||
//
|
||
// This page is in page file format, deallocate the page file space.
|
||
//
|
||
|
||
MiReleasePageFileSpace (Pfn->OriginalPte);
|
||
|
||
//
|
||
// Change original PTE to indicate no page file space is reserved,
|
||
// otherwise the space will be deallocated when the PTE is
|
||
// deleted.
|
||
//
|
||
|
||
Pfn->OriginalPte.u.Soft.PageFileHigh = 0;
|
||
}
|
||
|
||
|
||
return;
|
||
}
|
||
|
||
ULONG
|
||
FASTCALL
|
||
MiDetermineUserGlobalPteMask (
|
||
IN PMMPTE Pte
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
Builds a mask to OR with the PTE frame field.
|
||
This mask has the valid and access bits set and
|
||
has the global and owner bits set based on the
|
||
address of the PTE.
|
||
|
||
******************* NOTE *********************************************
|
||
THIS ROUTINE DOES NOT CHECK FOR PDEs WHICH NEED TO BE
|
||
SET GLOBAL AS IT ASSUMES PDEs FOR SYSTEM SPACE ARE
|
||
PROPERLY SET AT INITIALIZATION TIME!
|
||
|
||
Arguments:
|
||
|
||
Pte - Supplies a pointer to the PTE in which to fill.
|
||
|
||
Return Value:
|
||
|
||
Mask to OR into the frame to make a valid PTE.
|
||
|
||
Environment:
|
||
|
||
Kernel mode, 386 specific.
|
||
|
||
--*/
|
||
|
||
|
||
{
|
||
MMPTE Mask;
|
||
|
||
Mask.u.Long = 0;
|
||
Mask.u.Hard.Valid = 1;
|
||
Mask.u.Hard.Accessed = 1;
|
||
|
||
if (Pte <= MiHighestUserPte) {
|
||
Mask.u.Hard.Owner = 1;
|
||
} else if ((Pte < MiGetPteAddress (PTE_BASE)) ||
|
||
(Pte >= MiGetPteAddress (MM_SYSTEM_CACHE_WORKING_SET))) {
|
||
if (MI_IS_SESSION_PTE (Pte) == FALSE) {
|
||
#if defined (_X86PAE_)
|
||
if ((Pte < (PMMPTE)PDE_BASE) || (Pte > (PMMPTE)PDE_TOP))
|
||
#endif
|
||
Mask.u.Long |= MmPteGlobal.u.Long;
|
||
}
|
||
} else if ((Pte >= MiGetPdeAddress (NULL)) && (Pte <= MiHighestUserPde)) {
|
||
Mask.u.Hard.Owner = 1;
|
||
}
|
||
|
||
//
|
||
// Since the valid, accessed, global and owner bits are always in the
|
||
// low dword of the PTE, returning a ULONG is ok.
|
||
//
|
||
|
||
return (ULONG)Mask.u.Long;
|
||
}
|