You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
160 lines
3.2 KiB
160 lines
3.2 KiB
/*++
|
|
|
|
Copyright (c) 1989 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
setmodfy.c
|
|
|
|
Abstract:
|
|
|
|
This module contains the setting modify bit routine for memory management.
|
|
x86 specific.
|
|
|
|
Author:
|
|
|
|
Lou Perazzoli (loup) 6-Jan-1990
|
|
Landy Wang (landyw) 2-Jun-1997
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
|
|
#include "mi.h"
|
|
|
|
#if defined (_X86PAE_)
|
|
extern PMMPTE MmSystemCacheWorkingSetListPte;
|
|
#endif
|
|
|
|
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 defined (_X86PAE_)
|
|
ASSERT (MmSystemCacheWorkingSetListPte != NULL);
|
|
#endif
|
|
|
|
if (Pte <= MiHighestUserPte) {
|
|
Mask.u.Hard.Owner = 1;
|
|
}
|
|
else if ((Pte < MiGetPteAddress (PTE_BASE)) ||
|
|
#if defined (_X86PAE_)
|
|
(Pte >= MmSystemCacheWorkingSetListPte)
|
|
#else
|
|
(Pte >= MiGetPteAddress (MM_SYSTEM_CACHE_WORKING_SET))
|
|
#endif
|
|
) {
|
|
|
|
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;
|
|
}
|