[ion] 57148: [NTOSKRNL]: Fix broken way we were creating prototype PTEs, which was only supporting 256MB worth of prototype PTE area instead of 1GB. [NTOSKRNL]: Add support (macros) for subsection ...
24 Aug
2012
24 Aug
'12
6:08 a.m.
Author: ion
Date: Fri Aug 24 06:08:20 2012
New Revision: 57148
URL: http://svn.reactos.org/svn/reactos?rev=57148&view=rev
Log:
[NTOSKRNL]: Fix broken way we were creating prototype PTEs, which was only supporting
256MB worth of prototype PTE area instead of 1GB.
[NTOSKRNL]: Add support (macros) for subsection PTEs.
Modified:
trunk/reactos/ntoskrnl/mm/ARM3/miarm.h
trunk/reactos/ntoskrnl/mm/ARM3/mminit.c
trunk/reactos/ntoskrnl/mm/ARM3/pagfault.c
Modified: trunk/reactos/ntoskrnl/mm/ARM3/miarm.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/miarm.h?r…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/miarm.h [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/miarm.h [iso-8859-1] Fri Aug 24 06:08:20 2012
@@ -266,7 +266,19 @@
//
#define MiProtoPteToPte(x) \
(PMMPTE)((ULONG_PTR)MmPagedPoolStart + \
- (((x)->u.Proto.ProtoAddressHigh << 7) |
(x)->u.Proto.ProtoAddressLow))
+ (((x)->u.Proto.ProtoAddressHigh << 9) |
(x)->u.Proto.ProtoAddressLow << 2))
+
+//
+// Decodes a Prototype PTE into the underlying PTE
+//
+#define MiSubsectionPteToSubsection(x) \
+ ((x)->u.Subsect.WhichPool == PagedPool) ? \
+ (PMMPTE)((ULONG_PTR)MmSubsectionBase + \
+ (((x)->u.Subsect.SubsectionAddressHigh << 7) | \
+ (x)->u.Subsect.SubsectionAddressLow << 3)) : \
+ (PMMPTE)((ULONG_PTR)MmNonPagedPoolEnd - \
+ (((x)->u.Subsect.SubsectionAddressHigh << 7) | \
+ (x)->u.Subsect.SubsectionAddressLow << 3))
#endif
//
@@ -631,7 +643,6 @@
extern PVOID MmSystemCacheEnd;
extern MMSUPPORT MmSystemCacheWs;
extern SIZE_T MmAllocatedNonPagedPool;
-extern ULONG_PTR MmSubsectionBase;
extern ULONG MmSpecialPoolTag;
extern PVOID MmHyperSpaceEnd;
extern PMMWSL MmSystemCacheWorkingSetList;
@@ -694,6 +705,7 @@
extern KGUARDED_MUTEX MmSectionBasedMutex;
extern PVOID MmHighSectionBase;
extern SIZE_T MmSystemLockPagesCount;
+extern ULONG_PTR MmSubsectionBase;
BOOLEAN
FORCEINLINE
@@ -875,15 +887,58 @@
/*
* Prototype PTEs are only valid in paged pool by design, this little trick
- * lets us only use 28 bits for the adress of the PTE
+ * lets us only use 30 bits for the adress of the PTE, as long as the area
+ * stays 1024MB At most.
*/
Offset = (ULONG_PTR)PointerPte - (ULONG_PTR)MmPagedPoolStart;
- /* 7 bits go in the "low", and the other 21 bits go in the "high"
*/
- NewPte->u.Proto.ProtoAddressLow = Offset & 0x7F;
- NewPte->u.Proto.ProtoAddressHigh = (Offset & 0xFFFFFF80) >> 7;
- ASSERT(MiProtoPteToPte(NewPte) == PointerPte);
-}
+ /*
+ * 7 bits go in the "low" (but we assume the bottom 2 are zero)
+ * and the other 21 bits go in the "high"
+ */
+ NewPte->u.Proto.ProtoAddressLow = (Offset & 0x1FC) >> 2;
+ NewPte->u.Proto.ProtoAddressHigh = (Offset & 0x3FFFFE00) >> 9;
+}
+
+//
+// Builds a Subsection PTE for the address of the Segment
+//
+FORCEINLINE
+VOID
+MI_MAKE_SUBSECTION_PTE(IN PMMPTE NewPte,
+ IN PVOID Segment)
+{
+ ULONG_PTR Offset;
+
+ /* Mark this as a prototype */
+ NewPte->u.Long = 0;
+ NewPte->u.Subsect.Prototype = 1;
+
+ /*
+ * Segments are only valid either in nonpaged pool. We store the 20 bit
+ * difference either from the top or bottom of nonpaged pool, giving a
+ * maximum of 128MB to each delta, meaning nonpaged pool cannot exceed
+ * 256MB.
+ */
+ if ((ULONG_PTR)Segment < ((ULONG_PTR)MmSubsectionBase + (128 * _1MB)))
+ {
+ Offset = (ULONG_PTR)Segment - (ULONG_PTR)MmSubsectionBase;
+ NewPte->u.Subsect.WhichPool = PagedPool;
+ }
+ else
+ {
+ Offset = (ULONG_PTR)MmNonPagedPoolEnd - (ULONG_PTR)Segment;
+ NewPte->u.Subsect.WhichPool = NonPagedPool;
+ }
+
+ /*
+ * 4 bits go in the "low" (but we assume the bottom 3 are zero)
+ * and the other 20 bits go in the "high"
+ */
+ NewPte->u.Subsect.SubsectionAddressLow = (Offset & 0x78) >> 3;
+ NewPte->u.Subsect.SubsectionAddressHigh = (Offset & 0xFFFFF80) >> 7;
+}
+
#endif
//
Modified: trunk/reactos/ntoskrnl/mm/ARM3/mminit.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/mminit.c?…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/mminit.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/mminit.c [iso-8859-1] Fri Aug 24 06:08:20 2012
@@ -2004,6 +2004,11 @@
PVOID Bitmap;
PPHYSICAL_MEMORY_RUN Run;
PFN_NUMBER PageCount;
+#if DBG
+ ULONG j;
+ PMMPTE PointerPte, TestPte;
+ MMPTE TempPte;
+#endif
/* Dump memory descriptors */
if (MiDbgEnableMdDump) MiDbgDumpMemoryDescriptors();
@@ -2063,9 +2068,43 @@
/* Initialize session space address layout */
MiInitializeSessionSpaceLayout();
-
+
/* Set the based section highest address */
MmHighSectionBase = (PVOID)((ULONG_PTR)MmHighestUserAddress - 0x800000);
+
+#if DBG
+ /* The subection PTE format depends on things being 8-byte aligned */
+ ASSERT((sizeof(CONTROL_AREA) % 8) == 0);
+ ASSERT((sizeof(SUBSECTION) % 8) == 0);
+
+ /* Prototype PTEs are assumed to be in paged pool, so check if the math works */
+ PointerPte = (PMMPTE)MmPagedPoolStart;
+ MI_MAKE_PROTOTYPE_PTE(&TempPte, PointerPte);
+ TestPte = MiProtoPteToPte(&TempPte);
+ ASSERT(PointerPte == TestPte);
+
+ /* Try the last nonpaged pool address */
+ PointerPte = (PMMPTE)MI_NONPAGED_POOL_END;
+ MI_MAKE_PROTOTYPE_PTE(&TempPte, PointerPte);
+ TestPte = MiProtoPteToPte(&TempPte);
+ ASSERT(PointerPte == TestPte);
+
+ /* Try a bunch of random addresses near the end of the address space */
+ PointerPte = (PMMPTE)0xFFFC8000;
+ for (j = 0; j < 20; j += 1)
+ {
+ MI_MAKE_PROTOTYPE_PTE(&TempPte, PointerPte);
+ TestPte = MiProtoPteToPte(&TempPte);
+ ASSERT(PointerPte == TestPte);
+ PointerPte++;
+ }
+
+ /* Subsection PTEs are always in nonpaged pool, pick a random address to try */
+ PointerPte = (PMMPTE)0xFFAACBB8;
+ MI_MAKE_SUBSECTION_PTE(&TempPte, PointerPte);
+ TestPte = MiSubsectionPteToSubsection(&TempPte);
+ ASSERT(PointerPte == TestPte);
+#endif
/* Loop all 8 standby lists */
for (i = 0; i < 8; i++)
Modified: trunk/reactos/ntoskrnl/mm/ARM3/pagfault.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/mm/ARM3/pagfault.…
==============================================================================
--- trunk/reactos/ntoskrnl/mm/ARM3/pagfault.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/mm/ARM3/pagfault.c [iso-8859-1] Fri Aug 24 06:08:20 2012
@@ -1742,18 +1742,15 @@
{
/* Get the protection code and check if this is a proto PTE */
ProtectionCode = TempPte.u.Soft.Protection;
- DPRINT1("Code: %lx\n", ProtectionCode);
if (TempPte.u.Soft.Prototype)
{
/* Do we need to go find the real PTE? */
- DPRINT1("Soft: %lx\n", TempPte.u.Soft.PageFileHigh);
if (TempPte.u.Soft.PageFileHigh == MI_PTE_LOOKUP_NEEDED)
{
/* Get the prototype pte and VAD for it */
ProtoPte = MiCheckVirtualAddress(Address,
&ProtectionCode,
&Vad);
- DPRINT1("Address: %p ProtoP %p Code: %lx Vad: %p\n", Address,
ProtoPte, ProtectionCode, Vad);
if (!ProtoPte)
{
ASSERT(KeGetCurrentIrql() <= APC_LEVEL);
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