2 * PROJECT: ReactOS Kernel
3 * LICENSE: BSD - See COPYING.ARM in the top level directory
4 * FILE: ntoskrnl/mm/ARM3/pagfault.c
5 * PURPOSE: ARM Memory Manager Page Fault Handling
6 * PROGRAMMERS: ReactOS Portable Systems Group
9 /* INCLUDES *******************************************************************/
15 #define MODULE_INVOLVED_IN_ARM3
16 #include "../ARM3/miarm.h"
18 /* GLOBALS ********************************************************************/
20 #define HYDRA_PROCESS (PEPROCESS)1
22 BOOLEAN UserPdeFault
= FALSE
;
25 /* PRIVATE FUNCTIONS **********************************************************/
29 MiCheckForUserStackOverflow(IN PVOID Address
,
30 IN PVOID TrapInformation
)
32 PETHREAD CurrentThread
= PsGetCurrentThread();
33 PTEB Teb
= CurrentThread
->Tcb
.Teb
;
34 PVOID StackBase
, DeallocationStack
, NextStackAddress
;
38 /* Do we own the address space lock? */
39 if (CurrentThread
->AddressSpaceOwner
== 1)
41 /* This isn't valid */
42 DPRINT1("Process owns address space lock\n");
43 ASSERT(KeAreAllApcsDisabled() == TRUE
);
44 return STATUS_GUARD_PAGE_VIOLATION
;
47 /* Are we attached? */
48 if (KeIsAttachedProcess())
50 /* This isn't valid */
51 DPRINT1("Process is attached\n");
52 return STATUS_GUARD_PAGE_VIOLATION
;
55 /* Read the current settings */
56 StackBase
= Teb
->NtTib
.StackBase
;
57 DeallocationStack
= Teb
->DeallocationStack
;
58 GuranteedSize
= Teb
->GuaranteedStackBytes
;
59 DPRINT("Handling guard page fault with Stacks Addresses 0x%p and 0x%p, guarantee: %lx\n",
60 StackBase
, DeallocationStack
, GuranteedSize
);
62 /* Guarantees make this code harder, for now, assume there aren't any */
63 ASSERT(GuranteedSize
== 0);
65 /* So allocate only the minimum guard page size */
66 GuranteedSize
= PAGE_SIZE
;
68 /* Does this faulting stack address actually exist in the stack? */
69 if ((Address
>= StackBase
) || (Address
< DeallocationStack
))
72 DPRINT1("Faulting address outside of stack bounds. Address=%p, StackBase=%p, DeallocationStack=%p\n",
73 Address
, StackBase
, DeallocationStack
);
74 return STATUS_GUARD_PAGE_VIOLATION
;
77 /* This is where the stack will start now */
78 NextStackAddress
= (PVOID
)((ULONG_PTR
)PAGE_ALIGN(Address
) - GuranteedSize
);
80 /* Do we have at least one page between here and the end of the stack? */
81 if (((ULONG_PTR
)NextStackAddress
- PAGE_SIZE
) <= (ULONG_PTR
)DeallocationStack
)
83 /* We don't -- Windows would try to make this guard page valid now */
84 DPRINT1("Close to our death...\n");
86 return STATUS_STACK_OVERFLOW
;
89 /* Don't handle this flag yet */
90 ASSERT((PsGetCurrentProcess()->Peb
->NtGlobalFlag
& FLG_DISABLE_STACK_EXTENSION
) == 0);
92 /* Update the stack limit */
93 Teb
->NtTib
.StackLimit
= (PVOID
)((ULONG_PTR
)NextStackAddress
+ GuranteedSize
);
95 /* Now move the guard page to the next page */
96 Status
= ZwAllocateVirtualMemory(NtCurrentProcess(),
101 PAGE_READWRITE
| PAGE_GUARD
);
102 if ((NT_SUCCESS(Status
) || (Status
== STATUS_ALREADY_COMMITTED
)))
105 DPRINT("Guard page handled successfully for %p\n", Address
);
106 return STATUS_PAGE_FAULT_GUARD_PAGE
;
109 /* Fail, we couldn't move the guard page */
110 DPRINT1("Guard page failure: %lx\n", Status
);
112 return STATUS_STACK_OVERFLOW
;
118 _In_ ULONG ProtectionMask
,
120 _In_ BOOLEAN Execute
)
122 #define _BYTE_MASK(Bit0, Bit1, Bit2, Bit3, Bit4, Bit5, Bit6, Bit7) \
123 (Bit0) | ((Bit1) << 1) | ((Bit2) << 2) | ((Bit3) << 3) | \
124 ((Bit4) << 4) | ((Bit5) << 5) | ((Bit6) << 6) | ((Bit7) << 7)
125 static const UCHAR AccessAllowedMask
[2][2] =
127 { // Protect 0 1 2 3 4 5 6 7
128 _BYTE_MASK(0, 1, 1, 1, 1, 1, 1, 1), // READ
129 _BYTE_MASK(0, 0, 1, 1, 0, 0, 1, 1), // EXECUTE READ
132 _BYTE_MASK(0, 0, 0, 0, 1, 1, 1, 1), // WRITE
133 _BYTE_MASK(0, 0, 0, 0, 0, 0, 1, 1), // EXECUTE WRITE
137 /* We want only the lower access bits */
138 ProtectionMask
&= MM_PROTECT_ACCESS
;
140 /* Look it up in the table */
141 return (AccessAllowedMask
[Write
!= 0][Execute
!= 0] >> ProtectionMask
) & 1;
146 MiAccessCheck(IN PMMPTE PointerPte
,
147 IN BOOLEAN StoreInstruction
,
148 IN KPROCESSOR_MODE PreviousMode
,
149 IN ULONG_PTR ProtectionMask
,
155 /* Check for invalid user-mode access */
156 if ((PreviousMode
== UserMode
) && (PointerPte
> MiHighestUserPte
))
158 return STATUS_ACCESS_VIOLATION
;
161 /* Capture the PTE -- is it valid? */
162 TempPte
= *PointerPte
;
163 if (TempPte
.u
.Hard
.Valid
)
165 /* Was someone trying to write to it? */
166 if (StoreInstruction
)
169 if ((TempPte
.u
.Hard
.Write
) || (TempPte
.u
.Hard
.CopyOnWrite
))
171 /* Then there's nothing to worry about */
172 return STATUS_SUCCESS
;
175 /* Oops! This isn't allowed */
176 return STATUS_ACCESS_VIOLATION
;
179 /* Someone was trying to read from a valid PTE, that's fine too */
180 return STATUS_SUCCESS
;
183 /* Check if the protection on the page allows what is being attempted */
184 if (!MiIsAccessAllowed(ProtectionMask
, StoreInstruction
, FALSE
))
186 return STATUS_ACCESS_VIOLATION
;
189 /* Check if this is a guard page */
190 if ((ProtectionMask
& MM_PROTECT_SPECIAL
) == MM_GUARDPAGE
)
192 NT_ASSERT(ProtectionMask
!= MM_DECOMMIT
);
194 /* Attached processes can't expand their stack */
195 if (KeIsAttachedProcess()) return STATUS_ACCESS_VIOLATION
;
197 /* No support for transition PTEs yet */
198 ASSERT(((TempPte
.u
.Soft
.Transition
== 1) &&
199 (TempPte
.u
.Soft
.Prototype
== 0)) == FALSE
);
201 /* Remove the guard page bit, and return a guard page violation */
202 TempPte
.u
.Soft
.Protection
= ProtectionMask
& ~MM_GUARDPAGE
;
203 NT_ASSERT(TempPte
.u
.Long
!= 0);
204 MI_WRITE_INVALID_PTE(PointerPte
, TempPte
);
205 return STATUS_GUARD_PAGE_VIOLATION
;
209 return STATUS_SUCCESS
;
214 MiCheckVirtualAddress(IN PVOID VirtualAddress
,
215 OUT PULONG ProtectCode
,
216 OUT PMMVAD
*ProtoVad
)
221 /* No prototype/section support for now */
224 /* User or kernel fault? */
225 if (VirtualAddress
<= MM_HIGHEST_USER_ADDRESS
)
227 /* Special case for shared data */
228 if (PAGE_ALIGN(VirtualAddress
) == (PVOID
)MM_SHARED_USER_DATA_VA
)
230 /* It's a read-only page */
231 *ProtectCode
= MM_READONLY
;
232 return MmSharedUserDataPte
;
235 /* Find the VAD, it might not exist if the address is bogus */
236 Vad
= MiLocateAddress(VirtualAddress
);
239 /* Bogus virtual address */
240 *ProtectCode
= MM_NOACCESS
;
244 /* ReactOS does not handle physical memory VADs yet */
245 ASSERT(Vad
->u
.VadFlags
.VadType
!= VadDevicePhysicalMemory
);
247 /* Check if it's a section, or just an allocation */
248 if (Vad
->u
.VadFlags
.PrivateMemory
)
250 /* ReactOS does not handle AWE VADs yet */
251 ASSERT(Vad
->u
.VadFlags
.VadType
!= VadAwe
);
253 /* This must be a TEB/PEB VAD */
254 if (Vad
->u
.VadFlags
.MemCommit
)
256 /* It's committed, so return the VAD protection */
257 *ProtectCode
= (ULONG
)Vad
->u
.VadFlags
.Protection
;
261 /* It has not yet been committed, so return no access */
262 *ProtectCode
= MM_NOACCESS
;
265 /* In both cases, return no PTE */
270 /* ReactOS does not supoprt these VADs yet */
271 ASSERT(Vad
->u
.VadFlags
.VadType
!= VadImageMap
);
272 ASSERT(Vad
->u2
.VadFlags2
.ExtendableFile
== 0);
274 /* Return the proto VAD */
277 /* Get the prototype PTE for this page */
278 PointerPte
= (((ULONG_PTR
)VirtualAddress
>> PAGE_SHIFT
) - Vad
->StartingVpn
) + Vad
->FirstPrototypePte
;
279 ASSERT(PointerPte
!= NULL
);
280 ASSERT(PointerPte
<= Vad
->LastContiguousPte
);
282 /* Return the Prototype PTE and the protection for the page mapping */
283 *ProtectCode
= (ULONG
)Vad
->u
.VadFlags
.Protection
;
287 else if (MI_IS_PAGE_TABLE_ADDRESS(VirtualAddress
))
289 /* This should never happen, as these addresses are handled by the double-maping */
290 if (((PMMPTE
)VirtualAddress
>= MiAddressToPte(MmPagedPoolStart
)) &&
291 ((PMMPTE
)VirtualAddress
<= MmPagedPoolInfo
.LastPteForPagedPool
))
293 /* Fail such access */
294 *ProtectCode
= MM_NOACCESS
;
298 /* Return full access rights */
299 *ProtectCode
= MM_READWRITE
;
302 else if (MI_IS_SESSION_ADDRESS(VirtualAddress
))
304 /* ReactOS does not have an image list yet, so bail out to failure case */
305 ASSERT(IsListEmpty(&MmSessionSpace
->ImageList
));
308 /* Default case -- failure */
309 *ProtectCode
= MM_NOACCESS
;
313 #if (_MI_PAGING_LEVELS == 2)
316 MiSynchronizeSystemPde(PMMPDE PointerPde
)
321 /* Get the Index from the PDE */
322 Index
= ((ULONG_PTR
)PointerPde
& (SYSTEM_PD_SIZE
- 1)) / sizeof(MMPTE
);
324 /* Copy the PDE from the double-mapped system page directory */
325 SystemPde
= MmSystemPagePtes
[Index
];
326 *PointerPde
= SystemPde
;
328 /* Make sure we re-read the PDE and PTE */
329 KeMemoryBarrierWithoutFence();
331 /* Return, if we had success */
332 return (BOOLEAN
)SystemPde
.u
.Hard
.Valid
;
337 MiCheckPdeForSessionSpace(IN PVOID Address
)
341 PVOID SessionAddress
;
344 /* Is this a session PTE? */
345 if (MI_IS_SESSION_PTE(Address
))
347 /* Make sure the PDE for session space is valid */
348 PointerPde
= MiAddressToPde(MmSessionSpace
);
349 if (!PointerPde
->u
.Hard
.Valid
)
351 /* This means there's no valid session, bail out */
352 DbgPrint("MiCheckPdeForSessionSpace: No current session for PTE %p\n",
355 return STATUS_ACCESS_VIOLATION
;
358 /* Now get the session-specific page table for this address */
359 SessionAddress
= MiPteToAddress(Address
);
360 PointerPde
= MiAddressToPte(Address
);
361 if (PointerPde
->u
.Hard
.Valid
) return STATUS_WAIT_1
;
363 /* It's not valid, so find it in the page table array */
364 Index
= ((ULONG_PTR
)SessionAddress
- (ULONG_PTR
)MmSessionBase
) >> 22;
365 TempPde
.u
.Long
= MmSessionSpace
->PageTables
[Index
].u
.Long
;
366 if (TempPde
.u
.Hard
.Valid
)
368 /* The copy is valid, so swap it in */
369 InterlockedExchange((PLONG
)PointerPde
, TempPde
.u
.Long
);
370 return STATUS_WAIT_1
;
373 /* We don't seem to have allocated a page table for this address yet? */
374 DbgPrint("MiCheckPdeForSessionSpace: No Session PDE for PTE %p, %p\n",
375 PointerPde
->u
.Long
, SessionAddress
);
377 return STATUS_ACCESS_VIOLATION
;
380 /* Is the address also a session address? If not, we're done */
381 if (!MI_IS_SESSION_ADDRESS(Address
)) return STATUS_SUCCESS
;
383 /* It is, so again get the PDE for session space */
384 PointerPde
= MiAddressToPde(MmSessionSpace
);
385 if (!PointerPde
->u
.Hard
.Valid
)
387 /* This means there's no valid session, bail out */
388 DbgPrint("MiCheckPdeForSessionSpace: No current session for VA %p\n",
391 return STATUS_ACCESS_VIOLATION
;
394 /* Now get the PDE for the address itself */
395 PointerPde
= MiAddressToPde(Address
);
396 if (!PointerPde
->u
.Hard
.Valid
)
398 /* Do the swap, we should be good to go */
399 Index
= ((ULONG_PTR
)Address
- (ULONG_PTR
)MmSessionBase
) >> 22;
400 PointerPde
->u
.Long
= MmSessionSpace
->PageTables
[Index
].u
.Long
;
401 if (PointerPde
->u
.Hard
.Valid
) return STATUS_WAIT_1
;
403 /* We had not allocated a page table for this session address yet, fail! */
404 DbgPrint("MiCheckPdeForSessionSpace: No Session PDE for VA %p, %p\n",
405 PointerPde
->u
.Long
, Address
);
407 return STATUS_ACCESS_VIOLATION
;
410 /* It's valid, so there's nothing to do */
411 return STATUS_SUCCESS
;
416 MiCheckPdeForPagedPool(IN PVOID Address
)
419 NTSTATUS Status
= STATUS_SUCCESS
;
421 /* Check session PDE */
422 if (MI_IS_SESSION_ADDRESS(Address
)) return MiCheckPdeForSessionSpace(Address
);
423 if (MI_IS_SESSION_PTE(Address
)) return MiCheckPdeForSessionSpace(Address
);
426 // Check if this is a fault while trying to access the page table itself
428 if (MI_IS_SYSTEM_PAGE_TABLE_ADDRESS(Address
))
431 // Send a hint to the page fault handler that this is only a valid fault
432 // if we already detected this was access within the page table range
434 PointerPde
= (PMMPDE
)MiAddressToPte(Address
);
435 Status
= STATUS_WAIT_1
;
437 else if (Address
< MmSystemRangeStart
)
440 // This is totally illegal
442 return STATUS_ACCESS_VIOLATION
;
447 // Get the PDE for the address
449 PointerPde
= MiAddressToPde(Address
);
453 // Check if it's not valid
455 if (PointerPde
->u
.Hard
.Valid
== 0)
458 // Copy it from our double-mapped system page directory
460 InterlockedExchangePte(PointerPde
,
461 MmSystemPagePtes
[((ULONG_PTR
)PointerPde
& (SYSTEM_PD_SIZE
- 1)) / sizeof(MMPTE
)].u
.Long
);
472 MiCheckPdeForPagedPool(IN PVOID Address
)
474 return STATUS_ACCESS_VIOLATION
;
480 MiZeroPfn(IN PFN_NUMBER PageFrameNumber
)
487 /* Get the PFN for this page */
488 Pfn1
= MiGetPfnEntry(PageFrameNumber
);
491 /* Grab a system PTE we can use to zero the page */
492 ZeroPte
= MiReserveSystemPtes(1, SystemPteSpace
);
495 /* Initialize the PTE for it */
496 TempPte
= ValidKernelPte
;
497 TempPte
.u
.Hard
.PageFrameNumber
= PageFrameNumber
;
500 if (Pfn1
->u3
.e1
.CacheAttribute
== MiWriteCombined
)
502 /* Write combining, no caching */
503 MI_PAGE_DISABLE_CACHE(&TempPte
);
504 MI_PAGE_WRITE_COMBINED(&TempPte
);
506 else if (Pfn1
->u3
.e1
.CacheAttribute
== MiNonCached
)
508 /* Write through, no caching */
509 MI_PAGE_DISABLE_CACHE(&TempPte
);
510 MI_PAGE_WRITE_THROUGH(&TempPte
);
513 /* Make the system PTE valid with our PFN */
514 MI_WRITE_VALID_PTE(ZeroPte
, TempPte
);
516 /* Get the address it maps to, and zero it out */
517 ZeroAddress
= MiPteToAddress(ZeroPte
);
518 KeZeroPages(ZeroAddress
, PAGE_SIZE
);
520 /* Now get rid of it */
521 MiReleaseSystemPtes(ZeroPte
, 1, SystemPteSpace
);
526 MiResolveDemandZeroFault(IN PVOID Address
,
527 IN PMMPTE PointerPte
,
528 IN PEPROCESS Process
,
531 PFN_NUMBER PageFrameNumber
= 0;
533 BOOLEAN NeedZero
= FALSE
, HaveLock
= FALSE
;
536 DPRINT("ARM3 Demand Zero Page Fault Handler for address: %p in process: %p\n",
540 /* Must currently only be called by paging path */
541 if ((Process
> HYDRA_PROCESS
) && (OldIrql
== MM_NOIRQL
))
544 ASSERT(MI_IS_PAGE_TABLE_ADDRESS(PointerPte
));
547 ASSERT(Process
->ForkInProgress
== NULL
);
549 /* Get process color */
550 Color
= MI_GET_NEXT_PROCESS_COLOR(Process
);
551 ASSERT(Color
!= 0xFFFFFFFF);
553 /* We'll need a zero page */
558 /* Check if we need a zero page */
559 NeedZero
= (OldIrql
!= MM_NOIRQL
);
561 /* Session-backed image views must be zeroed */
562 if ((Process
== HYDRA_PROCESS
) &&
563 ((MI_IS_SESSION_IMAGE_ADDRESS(Address
)) ||
564 ((Address
>= MiSessionViewStart
) && (Address
< MiSessionSpaceWs
))))
569 /* Hardcode unknown color */
573 /* Check if the PFN database should be acquired */
574 if (OldIrql
== MM_NOIRQL
)
576 /* Acquire it and remember we should release it after */
577 OldIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
581 /* We either manually locked the PFN DB, or already came with it locked */
582 ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL
);
583 ASSERT(PointerPte
->u
.Hard
.Valid
== 0);
585 /* Assert we have enough pages */
586 ASSERT(MmAvailablePages
>= 32);
589 if (UserPdeFault
) MI_SET_USAGE(MI_USAGE_PAGE_TABLE
);
590 if (!UserPdeFault
) MI_SET_USAGE(MI_USAGE_DEMAND_ZERO
);
592 if (Process
) MI_SET_PROCESS2(Process
->ImageFileName
);
593 if (!Process
) MI_SET_PROCESS2("Kernel Demand 0");
595 /* Do we need a zero page? */
596 if (Color
!= 0xFFFFFFFF)
598 /* Try to get one, if we couldn't grab a free page and zero it */
599 PageFrameNumber
= MiRemoveZeroPageSafe(Color
);
600 if (!PageFrameNumber
)
602 /* We'll need a free page and zero it manually */
603 PageFrameNumber
= MiRemoveAnyPage(Color
);
609 /* Get a color, and see if we should grab a zero or non-zero page */
610 Color
= MI_GET_NEXT_COLOR();
613 /* Process or system doesn't want a zero page, grab anything */
614 PageFrameNumber
= MiRemoveAnyPage(Color
);
618 /* System wants a zero page, obtain one */
619 PageFrameNumber
= MiRemoveZeroPage(Color
);
624 MiInitializePfn(PageFrameNumber
, PointerPte
, TRUE
);
626 /* Do we have the lock? */
630 KeReleaseQueuedSpinLock(LockQueuePfnLock
, OldIrql
);
632 /* Update performance counters */
633 if (Process
> HYDRA_PROCESS
) Process
->NumberOfPrivatePages
++;
636 /* Increment demand zero faults */
637 InterlockedIncrement(&KeGetCurrentPrcb()->MmDemandZeroCount
);
639 /* Zero the page if need be */
640 if (NeedZero
) MiZeroPfn(PageFrameNumber
);
642 /* Fault on user PDE, or fault on user PTE? */
643 if (PointerPte
<= MiHighestUserPte
)
645 /* User fault, build a user PTE */
646 MI_MAKE_HARDWARE_PTE_USER(&TempPte
,
648 PointerPte
->u
.Soft
.Protection
,
653 /* This is a user-mode PDE, create a kernel PTE for it */
654 MI_MAKE_HARDWARE_PTE(&TempPte
,
656 PointerPte
->u
.Soft
.Protection
,
660 /* Set it dirty if it's a writable page */
661 if (MI_IS_PAGE_WRITEABLE(&TempPte
)) MI_MAKE_DIRTY_PAGE(&TempPte
);
664 MI_WRITE_VALID_PTE(PointerPte
, TempPte
);
666 /* Did we manually acquire the lock */
669 /* Get the PFN entry */
670 Pfn1
= MI_PFN_ELEMENT(PageFrameNumber
);
672 /* Windows does these sanity checks */
673 ASSERT(Pfn1
->u1
.Event
== 0);
674 ASSERT(Pfn1
->u3
.e1
.PrototypePte
== 0);
680 DPRINT("Demand zero page has now been paged in\n");
681 return STATUS_PAGE_FAULT_DEMAND_ZERO
;
686 MiCompleteProtoPteFault(IN BOOLEAN StoreInstruction
,
688 IN PMMPTE PointerPte
,
689 IN PMMPTE PointerProtoPte
,
691 IN PMMPFN
* LockedProtoPfn
)
694 PMMPTE OriginalPte
, PageTablePte
;
695 ULONG_PTR Protection
;
696 PFN_NUMBER PageFrameIndex
;
698 BOOLEAN OriginalProtection
, DirtyPage
;
700 /* Must be called with an valid prototype PTE, with the PFN lock held */
701 ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL
);
702 ASSERT(PointerProtoPte
->u
.Hard
.Valid
== 1);
705 PageFrameIndex
= PFN_FROM_PTE(PointerProtoPte
);
707 /* Get the PFN entry and set it as a prototype PTE */
708 Pfn1
= MiGetPfnEntry(PageFrameIndex
);
709 Pfn1
->u3
.e1
.PrototypePte
= 1;
711 /* Increment the share count for the page table */
712 // FIXME: This doesn't work because we seem to bump the sharecount to two, and MiDeletePte gets annoyed and ASSERTs.
713 // This could be beause MiDeletePte is now being called from strange code in Rosmm
714 PageTablePte
= MiAddressToPte(PointerPte
);
715 Pfn2
= MiGetPfnEntry(PageTablePte
->u
.Hard
.PageFrameNumber
);
716 //Pfn2->u2.ShareCount++;
717 DBG_UNREFERENCED_LOCAL_VARIABLE(Pfn2
);
719 /* Check where we should be getting the protection information from */
720 if (PointerPte
->u
.Soft
.PageFileHigh
== MI_PTE_LOOKUP_NEEDED
)
722 /* Get the protection from the PTE, there's no real Proto PTE data */
723 Protection
= PointerPte
->u
.Soft
.Protection
;
725 /* Remember that we did not use the proto protection */
726 OriginalProtection
= FALSE
;
730 /* Get the protection from the original PTE link */
731 OriginalPte
= &Pfn1
->OriginalPte
;
732 Protection
= OriginalPte
->u
.Soft
.Protection
;
734 /* Remember that we used the original protection */
735 OriginalProtection
= TRUE
;
737 /* Check if this was a write on a read only proto */
738 if ((StoreInstruction
) && !(Protection
& MM_READWRITE
))
741 StoreInstruction
= 0;
745 /* Check if this was a write on a non-COW page */
747 if ((StoreInstruction
) && ((Protection
& MM_WRITECOPY
) != MM_WRITECOPY
))
749 /* Then the page should be marked dirty */
753 ASSERT(Pfn1
->OriginalPte
.u
.Soft
.Prototype
!= 0);
756 /* Did we get a locked incoming PFN? */
759 /* Drop a reference */
760 ASSERT((*LockedProtoPfn
)->u3
.e2
.ReferenceCount
>= 1);
761 MiDereferencePfnAndDropLockCount(*LockedProtoPfn
);
762 *LockedProtoPfn
= NULL
;
765 /* Release the PFN lock */
766 KeReleaseQueuedSpinLock(LockQueuePfnLock
, OldIrql
);
768 /* Remove special/caching bits */
769 Protection
&= ~MM_PROTECT_SPECIAL
;
772 if (Pfn1
->u3
.e1
.CacheAttribute
== MiWriteCombined
)
774 /* Write combining, no caching */
775 MI_PAGE_DISABLE_CACHE(&TempPte
);
776 MI_PAGE_WRITE_COMBINED(&TempPte
);
778 else if (Pfn1
->u3
.e1
.CacheAttribute
== MiNonCached
)
780 /* Write through, no caching */
781 MI_PAGE_DISABLE_CACHE(&TempPte
);
782 MI_PAGE_WRITE_THROUGH(&TempPte
);
785 /* Check if this is a kernel or user address */
786 if (Address
< MmSystemRangeStart
)
788 /* Build the user PTE */
789 MI_MAKE_HARDWARE_PTE_USER(&TempPte
, PointerPte
, Protection
, PageFrameIndex
);
793 /* Build the kernel PTE */
794 MI_MAKE_HARDWARE_PTE(&TempPte
, PointerPte
, Protection
, PageFrameIndex
);
797 /* Set the dirty flag if needed */
798 if (DirtyPage
) TempPte
.u
.Hard
.Dirty
= TRUE
;
801 MI_WRITE_VALID_PTE(PointerPte
, TempPte
);
803 /* Reset the protection if needed */
804 if (OriginalProtection
) Protection
= MM_ZERO_ACCESS
;
807 ASSERT(PointerPte
== MiAddressToPte(Address
));
808 return STATUS_SUCCESS
;
813 MiResolvePageFileFault(_In_ BOOLEAN StoreInstruction
,
814 _In_ PVOID FaultingAddress
,
815 _In_ PMMPTE PointerPte
,
816 _In_ PEPROCESS CurrentProcess
,
817 _Inout_ KIRQL
*OldIrql
)
822 MMPTE TempPte
= *PointerPte
;
825 ULONG PageFileIndex
= TempPte
.u
.Soft
.PageFileLow
;
826 ULONG_PTR PageFileOffset
= TempPte
.u
.Soft
.PageFileHigh
;
828 /* Things we don't support yet */
829 ASSERT(CurrentProcess
> HYDRA_PROCESS
);
830 ASSERT(*OldIrql
!= MM_NOIRQL
);
832 /* We must hold the PFN lock */
833 ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL
);
835 /* Some sanity checks */
836 ASSERT(TempPte
.u
.Hard
.Valid
== 0);
837 ASSERT(TempPte
.u
.Soft
.PageFileHigh
!= 0);
838 ASSERT(TempPte
.u
.Soft
.PageFileHigh
!= MI_PTE_LOOKUP_NEEDED
);
840 /* Get any page, it will be overwritten */
841 Color
= MI_GET_NEXT_PROCESS_COLOR(CurrentProcess
);
842 Page
= MiRemoveAnyPage(Color
);
844 /* Initialize this PFN */
845 MiInitializePfn(Page
, PointerPte
, StoreInstruction
);
847 /* Sets the PFN as being in IO operation */
848 Pfn1
= MI_PFN_ELEMENT(Page
);
849 ASSERT(Pfn1
->u1
.Event
== NULL
);
850 ASSERT(Pfn1
->u3
.e1
.ReadInProgress
== 0);
851 ASSERT(Pfn1
->u3
.e1
.WriteInProgress
== 0);
853 KeInitializeEvent(&Event
, NotificationEvent
, FALSE
);
854 Pfn1
->u1
.Event
= &Event
;
855 Pfn1
->u3
.e1
.ReadInProgress
= 1;
857 /* We must write the PTE now as the PFN lock will be released while performing the IO operation */
858 TempPte
.u
.Soft
.Transition
= 1;
859 TempPte
.u
.Soft
.PageFileLow
= 0;
860 TempPte
.u
.Soft
.Prototype
= 0;
861 TempPte
.u
.Trans
.PageFrameNumber
= Page
;
863 MI_WRITE_INVALID_PTE(PointerPte
, TempPte
);
865 /* Release the PFN lock while we proceed */
866 KeReleaseQueuedSpinLock(LockQueuePfnLock
, *OldIrql
);
868 /* Do the paging IO */
869 Status
= MiReadPageFile(Page
, PageFileIndex
, PageFileOffset
);
871 /* Lock the PFN database again */
872 *OldIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
874 /* Nobody should have changed that while we were not looking */
875 ASSERT(Pfn1
->u1
.Event
== &Event
);
876 ASSERT(Pfn1
->u3
.e1
.ReadInProgress
== 1);
877 ASSERT(Pfn1
->u3
.e1
.WriteInProgress
== 0);
879 if (!NT_SUCCESS(Status
))
883 Pfn1
->u4
.InPageError
= 1;
884 Pfn1
->u1
.ReadStatus
= Status
;
887 /* This is now a nice and normal PFN */
888 Pfn1
->u1
.Event
= NULL
;
889 Pfn1
->u3
.e1
.ReadInProgress
= 0;
891 /* And the PTE can finally be valid */
892 MI_MAKE_HARDWARE_PTE(&TempPte
, PointerPte
, TempPte
.u
.Trans
.Protection
, Page
);
893 MI_WRITE_VALID_PTE(PointerPte
, TempPte
);
895 /* Waiters gonna wait */
896 KeSetEvent(&Event
, IO_NO_INCREMENT
, FALSE
);
903 MiResolveTransitionFault(IN PVOID FaultingAddress
,
904 IN PMMPTE PointerPte
,
905 IN PEPROCESS CurrentProcess
,
907 OUT PVOID
*InPageBlock
)
909 PFN_NUMBER PageFrameIndex
;
912 PMMPTE PointerToPteForProtoPage
;
913 DPRINT1("Transition fault on 0x%p with PTE 0x%p in process %s\n",
914 FaultingAddress
, PointerPte
, CurrentProcess
->ImageFileName
);
916 /* Windowss does this check */
917 ASSERT(*InPageBlock
== NULL
);
919 /* ARM3 doesn't support this path */
920 ASSERT(OldIrql
!= MM_NOIRQL
);
922 /* Capture the PTE and make sure it's in transition format */
923 TempPte
= *PointerPte
;
924 ASSERT((TempPte
.u
.Soft
.Valid
== 0) &&
925 (TempPte
.u
.Soft
.Prototype
== 0) &&
926 (TempPte
.u
.Soft
.Transition
== 1));
928 /* Get the PFN and the PFN entry */
929 PageFrameIndex
= TempPte
.u
.Trans
.PageFrameNumber
;
930 DPRINT1("Transition PFN: %lx\n", PageFrameIndex
);
931 Pfn1
= MiGetPfnEntry(PageFrameIndex
);
933 /* One more transition fault! */
934 InterlockedIncrement(&KeGetCurrentPrcb()->MmTransitionCount
);
936 /* This is from ARM3 -- Windows normally handles this here */
937 ASSERT(Pfn1
->u4
.InPageError
== 0);
939 /* See if we should wait before terminating the fault */
940 if (Pfn1
->u3
.e1
.ReadInProgress
== 1)
942 DPRINT1("The page is currently being read!\n");
943 ASSERT(Pfn1
->u1
.Event
!= NULL
);
944 *InPageBlock
= Pfn1
->u1
.Event
;
945 if (PointerPte
== Pfn1
->PteAddress
)
947 DPRINT1("And this if for this particular PTE.\n");
948 /* The PTE will be made valid by the thread serving the fault */
949 return STATUS_SUCCESS
; // FIXME: Maybe something more descriptive
953 /* Windows checks there's some free pages and this isn't an in-page error */
954 ASSERT(MmAvailablePages
> 0);
955 ASSERT(Pfn1
->u4
.InPageError
== 0);
957 /* ReactOS checks for this */
958 ASSERT(MmAvailablePages
> 32);
960 /* Was this a transition page in the valid list, or free/zero list? */
961 if (Pfn1
->u3
.e1
.PageLocation
== ActiveAndValid
)
963 /* All Windows does here is a bunch of sanity checks */
964 DPRINT1("Transition in active list\n");
965 ASSERT((Pfn1
->PteAddress
>= MiAddressToPte(MmPagedPoolStart
)) &&
966 (Pfn1
->PteAddress
<= MiAddressToPte(MmPagedPoolEnd
)));
967 ASSERT(Pfn1
->u2
.ShareCount
!= 0);
968 ASSERT(Pfn1
->u3
.e2
.ReferenceCount
!= 0);
972 /* Otherwise, the page is removed from its list */
973 DPRINT1("Transition page in free/zero list\n");
974 MiUnlinkPageFromList(Pfn1
);
975 MiReferenceUnusedPageAndBumpLockCount(Pfn1
);
978 /* At this point, there should no longer be any in-page errors */
979 ASSERT(Pfn1
->u4
.InPageError
== 0);
981 /* Check if this was a PFN with no more share references */
982 if (Pfn1
->u2
.ShareCount
== 0) MiDropLockCount(Pfn1
);
984 /* Bump the share count and make the page valid */
985 Pfn1
->u2
.ShareCount
++;
986 Pfn1
->u3
.e1
.PageLocation
= ActiveAndValid
;
988 /* Prototype PTEs are in paged pool, which itself might be in transition */
989 if (FaultingAddress
>= MmSystemRangeStart
)
991 /* Check if this is a paged pool PTE in transition state */
992 PointerToPteForProtoPage
= MiAddressToPte(PointerPte
);
993 TempPte
= *PointerToPteForProtoPage
;
994 if ((TempPte
.u
.Hard
.Valid
== 0) && (TempPte
.u
.Soft
.Transition
== 1))
996 /* This isn't yet supported */
997 DPRINT1("Double transition fault not yet supported\n");
1002 /* Build the transition PTE -- maybe a macro? */
1003 ASSERT(PointerPte
->u
.Hard
.Valid
== 0);
1004 ASSERT(PointerPte
->u
.Trans
.Prototype
== 0);
1005 ASSERT(PointerPte
->u
.Trans
.Transition
== 1);
1006 TempPte
.u
.Long
= (PointerPte
->u
.Long
& ~0xFFF) |
1007 (MmProtectToPteMask
[PointerPte
->u
.Trans
.Protection
]) |
1008 MiDetermineUserGlobalPteMask(PointerPte
);
1010 /* Is the PTE writeable? */
1011 if (((Pfn1
->u3
.e1
.Modified
) && (TempPte
.u
.Hard
.Write
)) &&
1012 (TempPte
.u
.Hard
.CopyOnWrite
== 0))
1015 TempPte
.u
.Hard
.Dirty
= TRUE
;
1020 TempPte
.u
.Hard
.Dirty
= FALSE
;
1023 /* Write the valid PTE */
1024 MI_WRITE_VALID_PTE(PointerPte
, TempPte
);
1026 /* Return success */
1027 return STATUS_PAGE_FAULT_TRANSITION
;
1032 MiResolveProtoPteFault(IN BOOLEAN StoreInstruction
,
1034 IN PMMPTE PointerPte
,
1035 IN PMMPTE PointerProtoPte
,
1036 IN OUT PMMPFN
*OutPfn
,
1037 OUT PVOID
*PageFileData
,
1038 OUT PMMPTE PteValue
,
1039 IN PEPROCESS Process
,
1041 IN PVOID TrapInformation
)
1043 MMPTE TempPte
, PteContents
;
1045 PFN_NUMBER PageFrameIndex
;
1047 PVOID InPageBlock
= NULL
;
1049 /* Must be called with an invalid, prototype PTE, with the PFN lock held */
1050 ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL
);
1051 ASSERT(PointerPte
->u
.Hard
.Valid
== 0);
1052 ASSERT(PointerPte
->u
.Soft
.Prototype
== 1);
1054 /* Read the prototype PTE and check if it's valid */
1055 TempPte
= *PointerProtoPte
;
1056 if (TempPte
.u
.Hard
.Valid
== 1)
1058 /* One more user of this mapped page */
1059 PageFrameIndex
= PFN_FROM_PTE(&TempPte
);
1060 Pfn1
= MiGetPfnEntry(PageFrameIndex
);
1061 Pfn1
->u2
.ShareCount
++;
1063 /* Call it a transition */
1064 InterlockedIncrement(&KeGetCurrentPrcb()->MmTransitionCount
);
1066 /* Complete the prototype PTE fault -- this will release the PFN lock */
1067 return MiCompleteProtoPteFault(StoreInstruction
,
1075 /* Make sure there's some protection mask */
1076 if (TempPte
.u
.Long
== 0)
1078 /* Release the lock */
1079 DPRINT1("Access on reserved section?\n");
1080 KeReleaseQueuedSpinLock(LockQueuePfnLock
, OldIrql
);
1081 return STATUS_ACCESS_VIOLATION
;
1084 /* There is no such thing as a decommitted prototype PTE */
1085 NT_ASSERT(TempPte
.u
.Long
!= MmDecommittedPte
.u
.Long
);
1087 /* Check for access rights on the PTE proper */
1088 PteContents
= *PointerPte
;
1089 if (PteContents
.u
.Soft
.PageFileHigh
!= MI_PTE_LOOKUP_NEEDED
)
1091 if (!PteContents
.u
.Proto
.ReadOnly
)
1093 /* Check for page acess in software */
1094 Status
= MiAccessCheck(PointerProtoPte
,
1097 TempPte
.u
.Soft
.Protection
,
1100 ASSERT(Status
== STATUS_SUCCESS
);
1102 /* Check for copy on write page */
1103 if ((TempPte
.u
.Soft
.Protection
& MM_WRITECOPY
) == MM_WRITECOPY
)
1105 /* Not yet supported */
1112 /* Check for copy on write page */
1113 if ((PteContents
.u
.Soft
.Protection
& MM_WRITECOPY
) == MM_WRITECOPY
)
1115 /* Not yet supported */
1120 /* Check for clone PTEs */
1121 if (PointerPte
<= MiHighestUserPte
) ASSERT(Process
->CloneRoot
== NULL
);
1123 /* We don't support mapped files yet */
1124 ASSERT(TempPte
.u
.Soft
.Prototype
== 0);
1126 /* We might however have transition PTEs */
1127 if (TempPte
.u
.Soft
.Transition
== 1)
1129 /* Resolve the transition fault */
1130 ASSERT(OldIrql
!= MM_NOIRQL
);
1131 Status
= MiResolveTransitionFault(Address
,
1136 ASSERT(NT_SUCCESS(Status
));
1140 /* We also don't support paged out pages */
1141 ASSERT(TempPte
.u
.Soft
.PageFileHigh
== 0);
1143 /* Resolve the demand zero fault */
1144 Status
= MiResolveDemandZeroFault(Address
,
1148 ASSERT(NT_SUCCESS(Status
));
1151 /* Complete the prototype PTE fault -- this will release the PFN lock */
1152 ASSERT(PointerPte
->u
.Hard
.Valid
== 0);
1153 return MiCompleteProtoPteFault(StoreInstruction
,
1163 MiDispatchFault(IN BOOLEAN StoreInstruction
,
1165 IN PMMPTE PointerPte
,
1166 IN PMMPTE PointerProtoPte
,
1167 IN BOOLEAN Recursive
,
1168 IN PEPROCESS Process
,
1169 IN PVOID TrapInformation
,
1173 KIRQL OldIrql
, LockIrql
;
1175 PMMPTE SuperProtoPte
;
1176 PMMPFN Pfn1
, OutPfn
= NULL
;
1177 PFN_NUMBER PageFrameIndex
;
1178 PFN_COUNT PteCount
, ProcessedPtes
;
1179 DPRINT("ARM3 Page Fault Dispatcher for address: %p in process: %p\n",
1183 /* Make sure the addresses are ok */
1184 ASSERT(PointerPte
== MiAddressToPte(Address
));
1187 // Make sure APCs are off and we're not at dispatch
1189 OldIrql
= KeGetCurrentIrql();
1190 ASSERT(OldIrql
<= APC_LEVEL
);
1191 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1194 // Grab a copy of the PTE
1196 TempPte
= *PointerPte
;
1198 /* Do we have a prototype PTE? */
1199 if (PointerProtoPte
)
1201 /* This should never happen */
1202 ASSERT(!MI_IS_PHYSICAL_ADDRESS(PointerProtoPte
));
1204 /* Check if this is a kernel-mode address */
1205 SuperProtoPte
= MiAddressToPte(PointerProtoPte
);
1206 if (Address
>= MmSystemRangeStart
)
1208 /* Lock the PFN database */
1209 LockIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
1211 /* Has the PTE been made valid yet? */
1212 if (!SuperProtoPte
->u
.Hard
.Valid
)
1216 else if (PointerPte
->u
.Hard
.Valid
== 1)
1221 /* Resolve the fault -- this will release the PFN lock */
1222 Status
= MiResolveProtoPteFault(StoreInstruction
,
1232 ASSERT(Status
== STATUS_SUCCESS
);
1234 /* Complete this as a transition fault */
1235 ASSERT(OldIrql
== KeGetCurrentIrql());
1236 ASSERT(OldIrql
<= APC_LEVEL
);
1237 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1242 /* We only handle the lookup path */
1243 ASSERT(PointerPte
->u
.Soft
.PageFileHigh
== MI_PTE_LOOKUP_NEEDED
);
1245 /* Is there a non-image VAD? */
1247 (Vad
->u
.VadFlags
.VadType
!= VadImageMap
) &&
1248 !(Vad
->u2
.VadFlags2
.ExtendableFile
))
1250 /* One day, ReactOS will cluster faults */
1251 ASSERT(Address
<= MM_HIGHEST_USER_ADDRESS
);
1252 DPRINT("Should cluster fault, but won't\n");
1255 /* Only one PTE to handle for now */
1259 /* Lock the PFN database */
1260 LockIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
1262 /* We only handle the valid path */
1263 ASSERT(SuperProtoPte
->u
.Hard
.Valid
== 1);
1265 /* Capture the PTE */
1266 TempPte
= *PointerProtoPte
;
1268 /* Loop to handle future case of clustered faults */
1271 /* For our current usage, this should be true */
1272 if (TempPte
.u
.Hard
.Valid
== 1)
1274 /* Bump the share count on the PTE */
1275 PageFrameIndex
= PFN_FROM_PTE(&TempPte
);
1276 Pfn1
= MI_PFN_ELEMENT(PageFrameIndex
);
1277 Pfn1
->u2
.ShareCount
++;
1279 else if ((TempPte
.u
.Soft
.Prototype
== 0) &&
1280 (TempPte
.u
.Soft
.Transition
== 1))
1282 /* This is a standby page, bring it back from the cache */
1283 PageFrameIndex
= TempPte
.u
.Trans
.PageFrameNumber
;
1284 DPRINT("oooh, shiny, a soft fault! 0x%lx\n", PageFrameIndex
);
1285 Pfn1
= MI_PFN_ELEMENT(PageFrameIndex
);
1286 ASSERT(Pfn1
->u3
.e1
.PageLocation
!= ActiveAndValid
);
1288 /* Should not yet happen in ReactOS */
1289 ASSERT(Pfn1
->u3
.e1
.ReadInProgress
== 0);
1290 ASSERT(Pfn1
->u4
.InPageError
== 0);
1293 MiUnlinkPageFromList(Pfn1
);
1295 /* Bump its reference count */
1296 ASSERT(Pfn1
->u2
.ShareCount
== 0);
1297 InterlockedIncrement16((PSHORT
)&Pfn1
->u3
.e2
.ReferenceCount
);
1298 Pfn1
->u2
.ShareCount
++;
1300 /* Make it valid again */
1301 /* This looks like another macro.... */
1302 Pfn1
->u3
.e1
.PageLocation
= ActiveAndValid
;
1303 ASSERT(PointerProtoPte
->u
.Hard
.Valid
== 0);
1304 ASSERT(PointerProtoPte
->u
.Trans
.Prototype
== 0);
1305 ASSERT(PointerProtoPte
->u
.Trans
.Transition
== 1);
1306 TempPte
.u
.Long
= (PointerProtoPte
->u
.Long
& ~0xFFF) |
1307 MmProtectToPteMask
[PointerProtoPte
->u
.Trans
.Protection
];
1308 TempPte
.u
.Hard
.Valid
= 1;
1309 TempPte
.u
.Hard
.Accessed
= 1;
1311 /* Is the PTE writeable? */
1312 if (((Pfn1
->u3
.e1
.Modified
) && (TempPte
.u
.Hard
.Write
)) &&
1313 (TempPte
.u
.Hard
.CopyOnWrite
== 0))
1316 TempPte
.u
.Hard
.Dirty
= TRUE
;
1321 TempPte
.u
.Hard
.Dirty
= FALSE
;
1324 /* Write the valid PTE */
1325 MI_WRITE_VALID_PTE(PointerProtoPte
, TempPte
);
1326 ASSERT(PointerPte
->u
.Hard
.Valid
== 0);
1330 /* Page is invalid, get out of the loop */
1334 /* One more done, was it the last? */
1335 if (++ProcessedPtes
== PteCount
)
1337 /* Complete the fault */
1338 MiCompleteProtoPteFault(StoreInstruction
,
1345 /* THIS RELEASES THE PFN LOCK! */
1349 /* No clustered faults yet */
1353 /* Did we resolve the fault? */
1356 /* Bump the transition count */
1357 InterlockedExchangeAddSizeT(&KeGetCurrentPrcb()->MmTransitionCount
, ProcessedPtes
);
1360 /* Loop all the processing we did */
1361 ASSERT(ProcessedPtes
== 0);
1363 /* Complete this as a transition fault */
1364 ASSERT(OldIrql
== KeGetCurrentIrql());
1365 ASSERT(OldIrql
<= APC_LEVEL
);
1366 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1367 return STATUS_PAGE_FAULT_TRANSITION
;
1370 /* We did not -- PFN lock is still held, prepare to resolve prototype PTE fault */
1371 OutPfn
= MI_PFN_ELEMENT(SuperProtoPte
->u
.Hard
.PageFrameNumber
);
1372 MiReferenceUsedPageAndBumpLockCount(OutPfn
);
1373 ASSERT(OutPfn
->u3
.e2
.ReferenceCount
> 1);
1374 ASSERT(PointerPte
->u
.Hard
.Valid
== 0);
1376 /* Resolve the fault -- this will release the PFN lock */
1377 Status
= MiResolveProtoPteFault(StoreInstruction
,
1387 //ASSERT(Status != STATUS_ISSUE_PAGING_IO);
1388 //ASSERT(Status != STATUS_REFAULT);
1389 //ASSERT(Status != STATUS_PTE_CHANGED);
1391 /* Did the routine clean out the PFN or should we? */
1394 /* We had a locked PFN, so acquire the PFN lock to dereference it */
1395 ASSERT(PointerProtoPte
!= NULL
);
1396 OldIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
1398 /* Dereference the locked PFN */
1399 MiDereferencePfnAndDropLockCount(OutPfn
);
1400 ASSERT(OutPfn
->u3
.e2
.ReferenceCount
>= 1);
1402 /* And now release the lock */
1403 KeReleaseQueuedSpinLock(LockQueuePfnLock
, OldIrql
);
1406 /* Complete this as a transition fault */
1407 ASSERT(OldIrql
== KeGetCurrentIrql());
1408 ASSERT(OldIrql
<= APC_LEVEL
);
1409 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1414 /* Is this a transition PTE */
1415 if (TempPte
.u
.Soft
.Transition
)
1417 PVOID InPageBlock
= NULL
;
1418 /* Lock the PFN database */
1419 LockIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
1422 Status
= MiResolveTransitionFault(Address
, PointerPte
, Process
, LockIrql
, &InPageBlock
);
1424 NT_ASSERT(NT_SUCCESS(Status
));
1426 /* And now release the lock and leave*/
1427 KeReleaseQueuedSpinLock(LockQueuePfnLock
, LockIrql
);
1429 if (InPageBlock
!= NULL
)
1431 /* The page is being paged in by another process */
1432 KeWaitForSingleObject(InPageBlock
, WrPageIn
, KernelMode
, FALSE
, NULL
);
1435 ASSERT(OldIrql
== KeGetCurrentIrql());
1436 ASSERT(OldIrql
<= APC_LEVEL
);
1437 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1441 /* Should we page the data back in ? */
1442 if (TempPte
.u
.Soft
.PageFileHigh
!= 0)
1444 /* Lock the PFN database */
1445 LockIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
1448 Status
= MiResolvePageFileFault(StoreInstruction
, Address
, PointerPte
, Process
, &LockIrql
);
1450 /* And now release the lock and leave*/
1451 KeReleaseQueuedSpinLock(LockQueuePfnLock
, LockIrql
);
1453 ASSERT(OldIrql
== KeGetCurrentIrql());
1454 ASSERT(OldIrql
<= APC_LEVEL
);
1455 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1460 // The PTE must be invalid but not completely empty. It must also not be a
1461 // prototype a transition or a paged-out PTE as those scenarii should've been handled above.
1462 // These are all Windows checks
1464 ASSERT(TempPte
.u
.Hard
.Valid
== 0);
1465 ASSERT(TempPte
.u
.Soft
.Prototype
== 0);
1466 ASSERT(TempPte
.u
.Soft
.Transition
== 0);
1467 ASSERT(TempPte
.u
.Soft
.PageFileHigh
== 0);
1468 ASSERT(TempPte
.u
.Long
!= 0);
1471 // If we got this far, the PTE can only be a demand zero PTE, which is what
1472 // we want. Go handle it!
1474 Status
= MiResolveDemandZeroFault(Address
,
1478 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1479 if (NT_SUCCESS(Status
))
1482 // Make sure we're returning in a sane state and pass the status down
1484 ASSERT(OldIrql
== KeGetCurrentIrql());
1485 ASSERT(KeGetCurrentIrql() <= APC_LEVEL
);
1490 // Generate an access fault
1492 return STATUS_ACCESS_VIOLATION
;
1497 MmArmAccessFault(IN BOOLEAN StoreInstruction
,
1499 IN KPROCESSOR_MODE Mode
,
1500 IN PVOID TrapInformation
)
1502 KIRQL OldIrql
= KeGetCurrentIrql(), LockIrql
;
1503 PMMPTE ProtoPte
= NULL
;
1504 PMMPTE PointerPte
= MiAddressToPte(Address
);
1505 PMMPDE PointerPde
= MiAddressToPde(Address
);
1506 #if (_MI_PAGING_LEVELS >= 3)
1507 PMMPDE PointerPpe
= MiAddressToPpe(Address
);
1508 #if (_MI_PAGING_LEVELS == 4)
1509 PMMPDE PointerPxe
= MiAddressToPxe(Address
);
1513 PETHREAD CurrentThread
;
1514 PEPROCESS CurrentProcess
;
1516 PMMSUPPORT WorkingSet
;
1517 ULONG ProtectionCode
;
1519 PFN_NUMBER PageFrameIndex
;
1521 BOOLEAN IsSessionAddress
;
1523 DPRINT("ARM3 FAULT AT: %p\n", Address
);
1525 /* Check for page fault on high IRQL */
1526 if (OldIrql
> APC_LEVEL
)
1528 #if (_MI_PAGING_LEVELS < 3)
1529 /* Could be a page table for paged pool, which we'll allow */
1530 if (MI_IS_SYSTEM_PAGE_TABLE_ADDRESS(Address
)) MiSynchronizeSystemPde((PMMPDE
)PointerPte
);
1531 MiCheckPdeForPagedPool(Address
);
1533 /* Check if any of the top-level pages are invalid */
1535 #if (_MI_PAGING_LEVELS == 4)
1536 (PointerPxe
->u
.Hard
.Valid
== 0) ||
1538 #if (_MI_PAGING_LEVELS >= 3)
1539 (PointerPpe
->u
.Hard
.Valid
== 0) ||
1541 (PointerPde
->u
.Hard
.Valid
== 0) ||
1542 (PointerPte
->u
.Hard
.Valid
== 0))
1544 /* This fault is not valid, print out some debugging help */
1545 DbgPrint("MM:***PAGE FAULT AT IRQL > 1 Va %p, IRQL %lx\n",
1548 if (TrapInformation
)
1550 PKTRAP_FRAME TrapFrame
= TrapInformation
;
1552 DbgPrint("MM:***EIP %p, EFL %p\n", TrapFrame
->Eip
, TrapFrame
->EFlags
);
1553 DbgPrint("MM:***EAX %p, ECX %p EDX %p\n", TrapFrame
->Eax
, TrapFrame
->Ecx
, TrapFrame
->Edx
);
1554 DbgPrint("MM:***EBX %p, ESI %p EDI %p\n", TrapFrame
->Ebx
, TrapFrame
->Esi
, TrapFrame
->Edi
);
1555 #elif defined(_M_AMD64)
1556 DbgPrint("MM:***RIP %p, EFL %p\n", TrapFrame
->Rip
, TrapFrame
->EFlags
);
1557 DbgPrint("MM:***RAX %p, RCX %p RDX %p\n", TrapFrame
->Rax
, TrapFrame
->Rcx
, TrapFrame
->Rdx
);
1558 DbgPrint("MM:***RBX %p, RSI %p RDI %p\n", TrapFrame
->Rbx
, TrapFrame
->Rsi
, TrapFrame
->Rdi
);
1562 /* Tell the trap handler to fail */
1563 return STATUS_IN_PAGE_ERROR
| 0x10000000;
1566 /* Not yet implemented in ReactOS */
1567 ASSERT(MI_IS_PAGE_LARGE(PointerPde
) == FALSE
);
1568 ASSERT(((StoreInstruction
) && (PointerPte
->u
.Hard
.CopyOnWrite
)) == FALSE
);
1570 /* Check if this was a write */
1571 if (StoreInstruction
)
1573 /* Was it to a read-only page? */
1574 Pfn1
= MI_PFN_ELEMENT(PointerPte
->u
.Hard
.PageFrameNumber
);
1575 if (!(PointerPte
->u
.Long
& PTE_READWRITE
) &&
1576 !(Pfn1
->OriginalPte
.u
.Soft
.Protection
& MM_READWRITE
))
1578 /* Crash with distinguished bugcheck code */
1579 KeBugCheckEx(ATTEMPTED_WRITE_TO_READONLY_MEMORY
,
1582 (ULONG_PTR
)TrapInformation
,
1587 /* Nothing is actually wrong */
1588 DPRINT1("Fault at IRQL %u is ok (%p)\n", OldIrql
, Address
);
1589 return STATUS_SUCCESS
;
1592 /* Check for kernel fault address */
1593 if (Address
>= MmSystemRangeStart
)
1595 /* Bail out, if the fault came from user mode */
1596 if (Mode
== UserMode
) return STATUS_ACCESS_VIOLATION
;
1598 #if (_MI_PAGING_LEVELS == 2)
1599 if (MI_IS_SYSTEM_PAGE_TABLE_ADDRESS(Address
)) MiSynchronizeSystemPde((PMMPDE
)PointerPte
);
1600 MiCheckPdeForPagedPool(Address
);
1603 /* Check if the higher page table entries are invalid */
1605 #if (_MI_PAGING_LEVELS == 4)
1606 /* AMD64 system, check if PXE is invalid */
1607 (PointerPxe
->u
.Hard
.Valid
== 0) ||
1609 #if (_MI_PAGING_LEVELS >= 3)
1610 /* PAE/AMD64 system, check if PPE is invalid */
1611 (PointerPpe
->u
.Hard
.Valid
== 0) ||
1613 /* Always check if the PDE is valid */
1614 (PointerPde
->u
.Hard
.Valid
== 0))
1616 /* PXE/PPE/PDE (still) not valid, kill the system */
1617 KeBugCheckEx(PAGE_FAULT_IN_NONPAGED_AREA
,
1620 (ULONG_PTR
)TrapInformation
,
1624 /* Not handling session faults yet */
1625 IsSessionAddress
= MI_IS_SESSION_ADDRESS(Address
);
1627 /* The PDE is valid, so read the PTE */
1628 TempPte
= *PointerPte
;
1629 if (TempPte
.u
.Hard
.Valid
== 1)
1631 /* Check if this was system space or session space */
1632 if (!IsSessionAddress
)
1634 /* Check if the PTE is still valid under PFN lock */
1635 OldIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
1636 TempPte
= *PointerPte
;
1637 if (TempPte
.u
.Hard
.Valid
)
1639 /* Check if this was a write */
1640 if (StoreInstruction
)
1642 /* Was it to a read-only page? */
1643 Pfn1
= MI_PFN_ELEMENT(PointerPte
->u
.Hard
.PageFrameNumber
);
1644 if (!(PointerPte
->u
.Long
& PTE_READWRITE
) &&
1645 !(Pfn1
->OriginalPte
.u
.Soft
.Protection
& MM_READWRITE
))
1647 /* Crash with distinguished bugcheck code */
1648 KeBugCheckEx(ATTEMPTED_WRITE_TO_READONLY_MEMORY
,
1651 (ULONG_PTR
)TrapInformation
,
1657 /* Release PFN lock and return all good */
1658 KeReleaseQueuedSpinLock(LockQueuePfnLock
, OldIrql
);
1659 return STATUS_SUCCESS
;
1662 #if (_MI_PAGING_LEVELS == 2)
1663 /* Check if this was a session PTE that needs to remap the session PDE */
1664 if (MI_IS_SESSION_PTE(Address
))
1666 /* Do the remapping */
1667 Status
= MiCheckPdeForSessionSpace(Address
);
1668 if (!NT_SUCCESS(Status
))
1670 /* It failed, this address is invalid */
1671 KeBugCheckEx(PAGE_FAULT_IN_NONPAGED_AREA
,
1674 (ULONG_PTR
)TrapInformation
,
1680 _WARN("Session space stuff is not implemented yet!")
1684 /* Check for a fault on the page table or hyperspace */
1685 if (MI_IS_PAGE_TABLE_OR_HYPER_ADDRESS(Address
))
1687 #if (_MI_PAGING_LEVELS < 3)
1688 /* Windows does this check but I don't understand why -- it's done above! */
1689 ASSERT(MiCheckPdeForPagedPool(Address
) != STATUS_WAIT_1
);
1691 /* Handle this as a user mode fault */
1695 /* Get the current thread */
1696 CurrentThread
= PsGetCurrentThread();
1698 /* What kind of address is this */
1699 if (!IsSessionAddress
)
1701 /* Use the system working set */
1702 WorkingSet
= &MmSystemCacheWs
;
1703 CurrentProcess
= NULL
;
1705 /* Make sure we don't have a recursive working set lock */
1706 if ((CurrentThread
->OwnsProcessWorkingSetExclusive
) ||
1707 (CurrentThread
->OwnsProcessWorkingSetShared
) ||
1708 (CurrentThread
->OwnsSystemWorkingSetExclusive
) ||
1709 (CurrentThread
->OwnsSystemWorkingSetShared
) ||
1710 (CurrentThread
->OwnsSessionWorkingSetExclusive
) ||
1711 (CurrentThread
->OwnsSessionWorkingSetShared
))
1714 return STATUS_IN_PAGE_ERROR
| 0x10000000;
1719 /* Use the session process and working set */
1720 CurrentProcess
= HYDRA_PROCESS
;
1721 WorkingSet
= &MmSessionSpace
->GlobalVirtualAddress
->Vm
;
1723 /* Make sure we don't have a recursive working set lock */
1724 if ((CurrentThread
->OwnsSessionWorkingSetExclusive
) ||
1725 (CurrentThread
->OwnsSessionWorkingSetShared
))
1728 return STATUS_IN_PAGE_ERROR
| 0x10000000;
1732 /* Acquire the working set lock */
1733 KeRaiseIrql(APC_LEVEL
, &LockIrql
);
1734 MiLockWorkingSet(CurrentThread
, WorkingSet
);
1736 /* Re-read PTE now that we own the lock */
1737 TempPte
= *PointerPte
;
1738 if (TempPte
.u
.Hard
.Valid
== 1)
1740 /* Check if this was a write */
1741 if (StoreInstruction
)
1743 /* Was it to a read-only page that is not copy on write? */
1744 Pfn1
= MI_PFN_ELEMENT(PointerPte
->u
.Hard
.PageFrameNumber
);
1745 if (!(TempPte
.u
.Long
& PTE_READWRITE
) &&
1746 !(Pfn1
->OriginalPte
.u
.Soft
.Protection
& MM_READWRITE
) &&
1747 !(TempPte
.u
.Hard
.CopyOnWrite
))
1749 /* Case not yet handled */
1750 ASSERT(!IsSessionAddress
);
1752 /* Crash with distinguished bugcheck code */
1753 KeBugCheckEx(ATTEMPTED_WRITE_TO_READONLY_MEMORY
,
1756 (ULONG_PTR
)TrapInformation
,
1761 /* Check for read-only write in session space */
1762 if ((IsSessionAddress
) &&
1763 (StoreInstruction
) &&
1764 !(TempPte
.u
.Hard
.Write
))
1767 ASSERT(MI_IS_SESSION_IMAGE_ADDRESS(Address
));
1770 if (TempPte
.u
.Hard
.CopyOnWrite
== 0)
1772 /* Then this is not allowed */
1773 KeBugCheckEx(ATTEMPTED_WRITE_TO_READONLY_MEMORY
,
1775 (ULONG_PTR
)TempPte
.u
.Long
,
1776 (ULONG_PTR
)TrapInformation
,
1780 /* Otherwise, handle COW */
1784 /* Release the working set */
1785 MiUnlockWorkingSet(CurrentThread
, WorkingSet
);
1786 KeLowerIrql(LockIrql
);
1788 /* Otherwise, the PDE was probably invalid, and all is good now */
1789 return STATUS_SUCCESS
;
1792 /* Check one kind of prototype PTE */
1793 if (TempPte
.u
.Soft
.Prototype
)
1795 /* Make sure protected pool is on, and that this is a pool address */
1796 if ((MmProtectFreedNonPagedPool
) &&
1797 (((Address
>= MmNonPagedPoolStart
) &&
1798 (Address
< (PVOID
)((ULONG_PTR
)MmNonPagedPoolStart
+
1799 MmSizeOfNonPagedPoolInBytes
))) ||
1800 ((Address
>= MmNonPagedPoolExpansionStart
) &&
1801 (Address
< MmNonPagedPoolEnd
))))
1803 /* Bad boy, bad boy, whatcha gonna do, whatcha gonna do when ARM3 comes for you! */
1804 KeBugCheckEx(DRIVER_CAUGHT_MODIFYING_FREED_POOL
,
1811 /* Get the prototype PTE! */
1812 ProtoPte
= MiProtoPteToPte(&TempPte
);
1814 /* Do we need to locate the prototype PTE in session space? */
1815 if ((IsSessionAddress
) &&
1816 (TempPte
.u
.Soft
.PageFileHigh
== MI_PTE_LOOKUP_NEEDED
))
1818 /* Yep, go find it as well as the VAD for it */
1819 ProtoPte
= MiCheckVirtualAddress(Address
,
1822 ASSERT(ProtoPte
!= NULL
);
1827 /* We don't implement transition PTEs */
1828 ASSERT(TempPte
.u
.Soft
.Transition
== 0);
1830 /* Check for no-access PTE */
1831 if (TempPte
.u
.Soft
.Protection
== MM_NOACCESS
)
1833 /* Bugcheck the system! */
1834 KeBugCheckEx(PAGE_FAULT_IN_NONPAGED_AREA
,
1837 (ULONG_PTR
)TrapInformation
,
1842 /* Check for demand page */
1843 if ((StoreInstruction
) &&
1845 !(IsSessionAddress
) &&
1846 !(TempPte
.u
.Hard
.Valid
))
1848 /* Get the protection code */
1849 ASSERT(TempPte
.u
.Soft
.Transition
== 0);
1850 if (!(TempPte
.u
.Soft
.Protection
& MM_READWRITE
))
1852 /* Bugcheck the system! */
1853 KeBugCheckEx(ATTEMPTED_WRITE_TO_READONLY_MEMORY
,
1856 (ULONG_PTR
)TrapInformation
,
1861 /* Now do the real fault handling */
1862 Status
= MiDispatchFault(StoreInstruction
,
1871 /* Release the working set */
1872 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1873 MiUnlockWorkingSet(CurrentThread
, WorkingSet
);
1874 KeLowerIrql(LockIrql
);
1877 DPRINT("Fault resolved with status: %lx\n", Status
);
1881 /* This is a user fault */
1883 CurrentThread
= PsGetCurrentThread();
1884 CurrentProcess
= (PEPROCESS
)CurrentThread
->Tcb
.ApcState
.Process
;
1886 /* Lock the working set */
1887 MiLockProcessWorkingSet(CurrentProcess
, CurrentThread
);
1889 #if (_MI_PAGING_LEVELS == 4)
1890 // Note to Timo: You should call MiCheckVirtualAddress and also check if it's zero pte
1891 // also this is missing the page count increment
1892 /* Check if the PXE is valid */
1893 if (PointerPxe
->u
.Hard
.Valid
== 0)
1895 /* Right now, we only handle scenarios where the PXE is totally empty */
1896 ASSERT(PointerPxe
->u
.Long
== 0);
1898 /* Resolve a demand zero fault */
1899 Status
= MiResolveDemandZeroFault(PointerPpe
,
1904 /* We should come back with a valid PXE */
1905 ASSERT(PointerPxe
->u
.Hard
.Valid
== 1);
1909 #if (_MI_PAGING_LEVELS >= 3)
1910 // Note to Timo: You should call MiCheckVirtualAddress and also check if it's zero pte
1911 // also this is missing the page count increment
1912 /* Check if the PPE is valid */
1913 if (PointerPpe
->u
.Hard
.Valid
== 0)
1915 /* Right now, we only handle scenarios where the PPE is totally empty */
1916 ASSERT(PointerPpe
->u
.Long
== 0);
1918 /* Resolve a demand zero fault */
1919 Status
= MiResolveDemandZeroFault(PointerPde
,
1924 /* We should come back with a valid PPE */
1925 ASSERT(PointerPpe
->u
.Hard
.Valid
== 1);
1929 /* Check if the PDE is valid */
1930 if (PointerPde
->u
.Hard
.Valid
== 0)
1932 /* Right now, we only handle scenarios where the PDE is totally empty */
1933 ASSERT(PointerPde
->u
.Long
== 0);
1935 /* And go dispatch the fault on the PDE. This should handle the demand-zero */
1937 UserPdeFault
= TRUE
;
1939 MiCheckVirtualAddress(Address
, &ProtectionCode
, &Vad
);
1940 if (ProtectionCode
== MM_NOACCESS
)
1942 #if (_MI_PAGING_LEVELS == 2)
1943 /* Could be a page table for paged pool */
1944 MiCheckPdeForPagedPool(Address
);
1946 /* Has the code above changed anything -- is this now a valid PTE? */
1947 Status
= (PointerPde
->u
.Hard
.Valid
== 1) ? STATUS_SUCCESS
: STATUS_ACCESS_VIOLATION
;
1949 /* Either this was a bogus VA or we've fixed up a paged pool PDE */
1950 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
1954 /* Write a demand-zero PDE */
1955 MI_WRITE_INVALID_PTE(PointerPde
, DemandZeroPde
);
1957 /* Dispatch the fault */
1958 Status
= MiDispatchFault(TRUE
,
1963 PsGetCurrentProcess(),
1967 UserPdeFault
= FALSE
;
1969 /* We should come back with APCs enabled, and with a valid PDE */
1970 ASSERT(KeAreAllApcsDisabled() == TRUE
);
1971 ASSERT(PointerPde
->u
.Hard
.Valid
== 1);
1975 /* Not yet implemented in ReactOS */
1976 ASSERT(MI_IS_PAGE_LARGE(PointerPde
) == FALSE
);
1979 /* Now capture the PTE. */
1980 TempPte
= *PointerPte
;
1982 /* Check if the PTE is valid */
1983 if (TempPte
.u
.Hard
.Valid
)
1985 /* Check if this is a write on a readonly PTE */
1986 if (StoreInstruction
)
1988 /* Is this a copy on write PTE? */
1989 if (TempPte
.u
.Hard
.CopyOnWrite
)
1991 /* Not supported yet */
1995 /* Is this a read-only PTE? */
1996 if (!TempPte
.u
.Hard
.Write
)
1998 /* Return the status */
1999 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2000 return STATUS_ACCESS_VIOLATION
;
2004 /* FIXME: Execution is ignored for now, since we don't have no-execute pages yet */
2006 /* The fault has already been resolved by a different thread */
2007 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2008 return STATUS_SUCCESS
;
2011 /* Quick check for demand-zero */
2012 if (TempPte
.u
.Long
== (MM_READWRITE
<< MM_PTE_SOFTWARE_PROTECTION_BITS
))
2014 /* Resolve the fault */
2015 MiResolveDemandZeroFault(Address
,
2020 /* Return the status */
2021 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2022 return STATUS_PAGE_FAULT_DEMAND_ZERO
;
2025 /* Check for zero PTE */
2026 if (TempPte
.u
.Long
== 0)
2028 /* Check if this address range belongs to a valid allocation (VAD) */
2029 ProtoPte
= MiCheckVirtualAddress(Address
, &ProtectionCode
, &Vad
);
2030 if (ProtectionCode
== MM_NOACCESS
)
2032 #if (_MI_PAGING_LEVELS == 2)
2033 /* Could be a page table for paged pool */
2034 MiCheckPdeForPagedPool(Address
);
2036 /* Has the code above changed anything -- is this now a valid PTE? */
2037 Status
= (PointerPte
->u
.Hard
.Valid
== 1) ? STATUS_SUCCESS
: STATUS_ACCESS_VIOLATION
;
2039 /* Either this was a bogus VA or we've fixed up a paged pool PDE */
2040 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2045 * Check if this is a real user-mode address or actually a kernel-mode
2046 * page table for a user mode address
2048 if (Address
<= MM_HIGHEST_USER_ADDRESS
)
2050 /* Add an additional page table reference */
2051 MiIncrementPageTableReferences(Address
);
2054 /* Is this a guard page? */
2055 if ((ProtectionCode
& MM_PROTECT_SPECIAL
) == MM_GUARDPAGE
)
2057 /* The VAD protection cannot be MM_DECOMMIT! */
2058 NT_ASSERT(ProtectionCode
!= MM_DECOMMIT
);
2060 /* Remove the bit */
2061 TempPte
.u
.Soft
.Protection
= ProtectionCode
& ~MM_GUARDPAGE
;
2062 MI_WRITE_INVALID_PTE(PointerPte
, TempPte
);
2065 ASSERT(ProtoPte
== NULL
);
2066 ASSERT(CurrentThread
->ApcNeeded
== 0);
2068 /* Drop the working set lock */
2069 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2070 ASSERT(KeGetCurrentIrql() == OldIrql
);
2072 /* Handle stack expansion */
2073 return MiCheckForUserStackOverflow(Address
, TrapInformation
);
2076 /* Did we get a prototype PTE back? */
2079 /* Is this PTE actually part of the PDE-PTE self-mapping directory? */
2080 if (PointerPde
== MiAddressToPde(PTE_BASE
))
2082 /* Then it's really a demand-zero PDE (on behalf of user-mode) */
2083 MI_WRITE_INVALID_PTE(PointerPte
, DemandZeroPde
);
2087 /* No, create a new PTE. First, write the protection */
2088 TempPte
.u
.Soft
.Protection
= ProtectionCode
;
2089 MI_WRITE_INVALID_PTE(PointerPte
, TempPte
);
2092 /* Lock the PFN database since we're going to grab a page */
2093 OldIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
2095 /* Make sure we have enough pages */
2096 ASSERT(MmAvailablePages
>= 32);
2098 /* Try to get a zero page */
2099 MI_SET_USAGE(MI_USAGE_PEB_TEB
);
2100 MI_SET_PROCESS2(CurrentProcess
->ImageFileName
);
2101 Color
= MI_GET_NEXT_PROCESS_COLOR(CurrentProcess
);
2102 PageFrameIndex
= MiRemoveZeroPageSafe(Color
);
2103 if (!PageFrameIndex
)
2105 /* Grab a page out of there. Later we should grab a colored zero page */
2106 PageFrameIndex
= MiRemoveAnyPage(Color
);
2107 ASSERT(PageFrameIndex
);
2109 /* Release the lock since we need to do some zeroing */
2110 KeReleaseQueuedSpinLock(LockQueuePfnLock
, OldIrql
);
2112 /* Zero out the page, since it's for user-mode */
2113 MiZeroPfn(PageFrameIndex
);
2115 /* Grab the lock again so we can initialize the PFN entry */
2116 OldIrql
= KeAcquireQueuedSpinLock(LockQueuePfnLock
);
2119 /* Initialize the PFN entry now */
2120 MiInitializePfn(PageFrameIndex
, PointerPte
, 1);
2122 /* And we're done with the lock */
2123 KeReleaseQueuedSpinLock(LockQueuePfnLock
, OldIrql
);
2125 /* Increment the count of pages in the process */
2126 CurrentProcess
->NumberOfPrivatePages
++;
2128 /* One more demand-zero fault */
2129 InterlockedIncrement(&KeGetCurrentPrcb()->MmDemandZeroCount
);
2131 /* Fault on user PDE, or fault on user PTE? */
2132 if (PointerPte
<= MiHighestUserPte
)
2134 /* User fault, build a user PTE */
2135 MI_MAKE_HARDWARE_PTE_USER(&TempPte
,
2137 PointerPte
->u
.Soft
.Protection
,
2142 /* This is a user-mode PDE, create a kernel PTE for it */
2143 MI_MAKE_HARDWARE_PTE(&TempPte
,
2145 PointerPte
->u
.Soft
.Protection
,
2149 /* Write the dirty bit for writeable pages */
2150 if (MI_IS_PAGE_WRITEABLE(&TempPte
)) MI_MAKE_DIRTY_PAGE(&TempPte
);
2152 /* And now write down the PTE, making the address valid */
2153 MI_WRITE_VALID_PTE(PointerPte
, TempPte
);
2154 Pfn1
= MI_PFN_ELEMENT(PageFrameIndex
);
2155 ASSERT(Pfn1
->u1
.Event
== NULL
);
2158 ASSERT(KeGetCurrentIrql() <= APC_LEVEL
);
2159 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2160 return STATUS_PAGE_FAULT_DEMAND_ZERO
;
2163 /* We should have a valid protection here */
2164 ASSERT(ProtectionCode
!= 0x100);
2166 /* Write the prototype PTE */
2167 TempPte
= PrototypePte
;
2168 TempPte
.u
.Soft
.Protection
= ProtectionCode
;
2169 NT_ASSERT(TempPte
.u
.Long
!= 0);
2170 MI_WRITE_INVALID_PTE(PointerPte
, TempPte
);
2174 /* Get the protection code and check if this is a proto PTE */
2175 ProtectionCode
= (ULONG
)TempPte
.u
.Soft
.Protection
;
2176 if (TempPte
.u
.Soft
.Prototype
)
2178 /* Do we need to go find the real PTE? */
2179 if (TempPte
.u
.Soft
.PageFileHigh
== MI_PTE_LOOKUP_NEEDED
)
2181 /* Get the prototype pte and VAD for it */
2182 ProtoPte
= MiCheckVirtualAddress(Address
,
2187 ASSERT(KeGetCurrentIrql() <= APC_LEVEL
);
2188 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2189 return STATUS_ACCESS_VIOLATION
;
2194 /* Get the prototype PTE! */
2195 ProtoPte
= MiProtoPteToPte(&TempPte
);
2197 /* Is it read-only */
2198 if (TempPte
.u
.Proto
.ReadOnly
)
2200 /* Set read-only code */
2201 ProtectionCode
= MM_READONLY
;
2205 /* Set unknown protection */
2206 ProtectionCode
= 0x100;
2207 ASSERT(CurrentProcess
->CloneRoot
!= NULL
);
2213 /* Do we have a valid protection code? */
2214 if (ProtectionCode
!= 0x100)
2216 /* Run a software access check first, including to detect guard pages */
2217 Status
= MiAccessCheck(PointerPte
,
2223 if (Status
!= STATUS_SUCCESS
)
2226 ASSERT(CurrentThread
->ApcNeeded
== 0);
2228 /* Drop the working set lock */
2229 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2230 ASSERT(KeGetCurrentIrql() == OldIrql
);
2232 /* Did we hit a guard page? */
2233 if (Status
== STATUS_GUARD_PAGE_VIOLATION
)
2235 /* Handle stack expansion */
2236 return MiCheckForUserStackOverflow(Address
, TrapInformation
);
2239 /* Otherwise, fail back to the caller directly */
2244 /* Dispatch the fault */
2245 Status
= MiDispatchFault(StoreInstruction
,
2254 /* Return the status */
2255 ASSERT(KeGetCurrentIrql() <= APC_LEVEL
);
2256 MiUnlockProcessWorkingSet(CurrentProcess
, CurrentThread
);
2262 MmGetExecuteOptions(IN PULONG ExecuteOptions
)
2264 PKPROCESS CurrentProcess
= &PsGetCurrentProcess()->Pcb
;
2265 ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL
);
2267 *ExecuteOptions
= 0;
2269 if (CurrentProcess
->Flags
.ExecuteDisable
)
2271 *ExecuteOptions
|= MEM_EXECUTE_OPTION_DISABLE
;
2274 if (CurrentProcess
->Flags
.ExecuteEnable
)
2276 *ExecuteOptions
|= MEM_EXECUTE_OPTION_ENABLE
;
2279 if (CurrentProcess
->Flags
.DisableThunkEmulation
)
2281 *ExecuteOptions
|= MEM_EXECUTE_OPTION_DISABLE_THUNK_EMULATION
;
2284 if (CurrentProcess
->Flags
.Permanent
)
2286 *ExecuteOptions
|= MEM_EXECUTE_OPTION_PERMANENT
;
2289 if (CurrentProcess
->Flags
.ExecuteDispatchEnable
)
2291 *ExecuteOptions
|= MEM_EXECUTE_OPTION_EXECUTE_DISPATCH_ENABLE
;
2294 if (CurrentProcess
->Flags
.ImageDispatchEnable
)
2296 *ExecuteOptions
|= MEM_EXECUTE_OPTION_IMAGE_DISPATCH_ENABLE
;
2299 return STATUS_SUCCESS
;
2304 MmSetExecuteOptions(IN ULONG ExecuteOptions
)
2306 PKPROCESS CurrentProcess
= &PsGetCurrentProcess()->Pcb
;
2307 KLOCK_QUEUE_HANDLE ProcessLock
;
2308 NTSTATUS Status
= STATUS_ACCESS_DENIED
;
2309 ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL
);
2311 /* Only accept valid flags */
2312 if (ExecuteOptions
& ~MEM_EXECUTE_OPTION_VALID_FLAGS
)
2315 DPRINT1("Invalid no-execute options\n");
2316 return STATUS_INVALID_PARAMETER
;
2319 /* Change the NX state in the process lock */
2320 KiAcquireProcessLock(CurrentProcess
, &ProcessLock
);
2322 /* Don't change anything if the permanent flag was set */
2323 if (!CurrentProcess
->Flags
.Permanent
)
2325 /* Start by assuming it's not disabled */
2326 CurrentProcess
->Flags
.ExecuteDisable
= FALSE
;
2328 /* Now process each flag and turn the equivalent bit on */
2329 if (ExecuteOptions
& MEM_EXECUTE_OPTION_DISABLE
)
2331 CurrentProcess
->Flags
.ExecuteDisable
= TRUE
;
2333 if (ExecuteOptions
& MEM_EXECUTE_OPTION_ENABLE
)
2335 CurrentProcess
->Flags
.ExecuteEnable
= TRUE
;
2337 if (ExecuteOptions
& MEM_EXECUTE_OPTION_DISABLE_THUNK_EMULATION
)
2339 CurrentProcess
->Flags
.DisableThunkEmulation
= TRUE
;
2341 if (ExecuteOptions
& MEM_EXECUTE_OPTION_PERMANENT
)
2343 CurrentProcess
->Flags
.Permanent
= TRUE
;
2345 if (ExecuteOptions
& MEM_EXECUTE_OPTION_EXECUTE_DISPATCH_ENABLE
)
2347 CurrentProcess
->Flags
.ExecuteDispatchEnable
= TRUE
;
2349 if (ExecuteOptions
& MEM_EXECUTE_OPTION_IMAGE_DISPATCH_ENABLE
)
2351 CurrentProcess
->Flags
.ImageDispatchEnable
= TRUE
;
2354 /* These are turned on by default if no-execution is also eanbled */
2355 if (CurrentProcess
->Flags
.ExecuteEnable
)
2357 CurrentProcess
->Flags
.ExecuteDispatchEnable
= TRUE
;
2358 CurrentProcess
->Flags
.ImageDispatchEnable
= TRUE
;
2362 Status
= STATUS_SUCCESS
;
2365 /* Release the lock and return status */
2366 KiReleaseProcessLock(&ProcessLock
);