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/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
checkpte.c
Abstract:
This module contains routines for sanity checking the page directory.
Author:
Lou Perazzoli (loup) 25-Apr-1989
Revision History:
--*/
#include "mi.h"
#if DBG
VOID
CheckValidPte (
IN PMMPTE PointerPte
);
VOID
CheckInvalidPte (
IN PMMPTE PointerPte
);
VOID
MiCheckPte (
VOID
)
/*++
Routine Description:
This routine checks each page table page in an address space to
ensure it is in the proper state.
Arguments:
None.
Return Value:
None.
Environment:
Kernel mode, APC's disabled.
--*/
{
ULONG i,j;
PMMPTE PointerPte;
PMMPTE PointerPde;
PMMPFN Pfn1;
ULONG ValidCount;
ULONG TransitionCount;
KIRQL PreviousIrql;
KIRQL OldIrql;
PEPROCESS TargetProcess;
USHORT UsedPages;
ULONG PdeValidCount;
TargetProcess = PsGetCurrentProcess ();
KeRaiseIrql (APC_LEVEL, &PreviousIrql);
LOCK_WS (TargetProcess);
LOCK_PFN (OldIrql);
PointerPde = MiGetPdeAddress(0);
UsedPages = 0;
PdeValidCount = 1;
for (i = 0; i < PDE_PER_PAGE; i++) {
if (PointerPde->u.Hard.Valid) {
if ((i < 512) || (i == 769) || (i== 896) ) {
PdeValidCount += 1;
}
ValidCount = 0;
TransitionCount = 0;
CheckValidPte (PointerPde);
PointerPte = MiGetPteAddress (i<<22);
for (j=0; j < PTE_PER_PAGE; j++) {
if ((PointerPte >= MiGetPteAddress(HYPER_SPACE)) &&
(PointerPte < MiGetPteAddress(WORKING_SET_LIST))) {
goto endloop;
}
if (PointerPte->u.Hard.Valid) {
ValidCount += 1;
CheckValidPte (PointerPte);
} else {
CheckInvalidPte (PointerPte);
if ((PointerPte->u.Soft.Transition == 1) &&
(PointerPte->u.Soft.Prototype == 0)) {
//
// Transition PTE, up the transition count.
//
TransitionCount += 1;
}
}
if (PointerPte->u.Long != 0) {
UsedPages += 1;
}
endloop:
PointerPte++;
}
if ((i < 512) || (i == 896)) {
if (MmWorkingSetList->UsedPageTableEntries[i] != UsedPages) {
DbgPrint("used pages and page table used not equal %lx %lx %lx\n",
i,MmWorkingSetList->UsedPageTableEntries[i], UsedPages);
}
}
//
// Check the share count for the page table page.
//
if ((i < 511) || (i == 896)) {
Pfn1 = MI_PFN_ELEMENT (PointerPde->u.Hard.PageFrameNumber);
if (Pfn1->u2.ShareCount != ((ULONG)1+ValidCount+TransitionCount)) {
DbgPrint("share count for page table page bad - %lx %lx %lx\n",
i,ValidCount, TransitionCount);
MiFormatPfn(Pfn1);
}
}
}
PointerPde++;
UsedPages = 0;
}
PointerPde = (PMMPTE)0xc0300c00;
Pfn1 = MI_PFN_ELEMENT(PointerPde->u.Hard.PageFrameNumber);
UNLOCK_PFN (OldIrql);
UNLOCK_WS (TargetProcess);
KeLowerIrql (PreviousIrql);
return;
}
VOID
CheckValidPte (
IN PMMPTE PointerPte
)
{
PMMPFN Pfn1;
PMMPTE PointerPde;
if (PointerPte->u.Hard.PageFrameNumber > MmNumberOfPhysicalPages) {
return;
}
Pfn1 = MI_PFN_ELEMENT(PointerPte->u.Hard.PageFrameNumber);
if (PointerPte->u.Hard.PageFrameNumber == 0) {
DbgPrint("physical page zero mapped\n");
MiFormatPte(PointerPte);
MiFormatPfn(Pfn1);
}
if (Pfn1->u3.e1.PageLocation != ActiveAndValid) {
DbgPrint("valid PTE with page frame not active and valid\n");
MiFormatPfn(Pfn1);
MiFormatPte(PointerPte);
}
if (Pfn1->u3.e1.PrototypePte == 0) {
//
// This is not a prototype PTE.
//
if (Pfn1->PteAddress != PointerPte) {
DbgPrint("checkpte - pfn pte address and pte address not equal\n");
MiFormatPte(PointerPte);
MiFormatPfn(Pfn1);
return;
}
}
if (!MmIsAddressValid(Pfn1->PteAddress)) {
return;
}
PointerPde = MiGetPteAddress (Pfn1->PteAddress);
if (PointerPde->u.Hard.Valid == 1) {
if (PointerPde->u.Hard.PageFrameNumber != Pfn1->PteFrame) {
DbgPrint("checkpte - pteframe not right\n");
MiFormatPfn(Pfn1);
MiFormatPte(PointerPte);
MiFormatPte(PointerPde);
}
}
return;
}
VOID
CheckInvalidPte (
IN PMMPTE PointerPte
)
{
PointerPte;
return;
}
#endif //DBG
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