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|NTOS:MM] Simplify some code

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This commit is contained in:
Jérôme Gardou
2021-02-03 09:41:23 +01:00
parent 48e1c8593f
commit 727e73f253
1 changed files with 25 additions and 22 deletions
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ntoskrnl/cache/section/sptab.c
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+25 -22
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@@ -204,27 +204,30 @@ _MmSetPageEntrySectionSegment(PMM_SECTION_SEGMENT Segment,
OldEntry,
Entry);
if (PFN_FROM_SSE(Entry) == PFN_FROM_SSE(OldEntry)) {
/* Nothing */
} else if (Entry && !IS_SWAP_FROM_SSE(Entry)) {
ASSERT(!OldEntry || IS_SWAP_FROM_SSE(OldEntry));
MmSetSectionAssociation(PFN_FROM_SSE(Entry), Segment, Offset);
} else if (OldEntry && !IS_SWAP_FROM_SSE(OldEntry)) {
ASSERT(!Entry || IS_SWAP_FROM_SSE(Entry));
MmDeleteSectionAssociation(PFN_FROM_SSE(OldEntry));
} else if (IS_SWAP_FROM_SSE(Entry)) {
ASSERT(!IS_SWAP_FROM_SSE(OldEntry) ||
SWAPENTRY_FROM_SSE(OldEntry) == MM_WAIT_ENTRY);
if (OldEntry && SWAPENTRY_FROM_SSE(OldEntry) != MM_WAIT_ENTRY)
MmDeleteSectionAssociation(PFN_FROM_SSE(OldEntry));
} else if (IS_SWAP_FROM_SSE(OldEntry)) {
ASSERT(!IS_SWAP_FROM_SSE(Entry));
if (Entry)
MmSetSectionAssociation(PFN_FROM_SSE(OldEntry), Segment, Offset);
} else {
/* We should not be replacing a page like this */
ASSERT(FALSE);
if (Entry && !IS_SWAP_FROM_SSE(Entry))
{
/* We have a valid entry. See if we must do something */
if (OldEntry && !IS_SWAP_FROM_SSE(OldEntry))
{
/* The previous entry was valid. Shall we swap the Rmaps ? */
if (PFN_FROM_SSE(Entry) != PFN_FROM_SSE(OldEntry))
{
MmDeleteSectionAssociation(PFN_FROM_SSE(OldEntry));
MmSetSectionAssociation(PFN_FROM_SSE(Entry), Segment, Offset);
}
}
else
{
/* We're switching to a valid entry from an invalid one. Add the Rmap */
MmSetSectionAssociation(PFN_FROM_SSE(Entry), Segment, Offset);
}
}
else if (OldEntry && !IS_SWAP_FROM_SSE(OldEntry))
{
/* We're switching to an invalid entry from a valid one */
MmDeleteSectionAssociation(PFN_FROM_SSE(OldEntry));
}
PageTable->PageEntries[PageIndex] = Entry;
return STATUS_SUCCESS;
}
@@ -332,13 +335,13 @@ MmGetSectionAssociation(PFN_NUMBER Page,
PMM_SECTION_SEGMENT Segment = NULL;
PCACHE_SECTION_PAGE_TABLE PageTable;
PageTable = (PCACHE_SECTION_PAGE_TABLE)MmGetSegmentRmap(Page,
&RawOffset);
PageTable = MmGetSegmentRmap(Page, &RawOffset);
if (PageTable)
{
Segment = PageTable->Segment;
Offset->QuadPart = PageTable->FileOffset.QuadPart +
((ULONG64)RawOffset << PAGE_SHIFT);
ASSERT(PFN_FROM_SSE(PageTable->PageEntries[RawOffset]) == Page);
}
return Segment;