/* Release the working set lock */
MiUnlockProcessWorkingSetForFault(CurrentProcess,
CurrentThread,
- WsSafe,
- WsShared);
+ &WsSafe,
+ &WsShared);
/* Fault it in */
Status = MmAccessFault(FALSE, PageTableVirtualAddress, KernelMode, NULL);
KeReleaseQueuedSpinLock(LockQueuePfnLock, OldIrql);
/* Destroy the PTE */
- PointerPte->u.Long = 0;
+ MI_ERASE_PTE(PointerPte);
+ }
+ else
+ {
+ /*
+ * The only other ARM3 possibility is a demand zero page, which would
+ * mean freeing some of the paged pool pages that haven't even been
+ * touched yet, as part of a larger allocation.
+ *
+ * Right now, we shouldn't expect any page file information in the PTE
+ */
+ ASSERT(PointerPte->u.Soft.PageFileHigh == 0);
+
+ /* Destroy the PTE */
+ MI_ERASE_PTE(PointerPte);
}
/* Actual legitimate pages */
ActualPages++;
}
- else
- {
- /*
- * The only other ARM3 possibility is a demand zero page, which would
- * mean freeing some of the paged pool pages that haven't even been
- * touched yet, as part of a larger allocation.
- *
- * Right now, we shouldn't expect any page file information in the PTE
- */
- ASSERT(PointerPte->u.Soft.PageFileHigh == 0);
-
- /* Destroy the PTE */
- PointerPte->u.Long = 0;
- }
/* Keep going */
PointerPte++;
}
/* Destroy the PTE and flush the TLB */
- PointerPte->u.Long = 0;
+ MI_ERASE_PTE(PointerPte);
KeFlushCurrentTb();
}
KIRQL OldIrql;
BOOLEAN AddressGap = FALSE;
PSUBSECTION Subsection;
- PUSHORT UsedPageTableEntries;
/* Get out if this is a fake VAD, RosMm will free the marea pages */
if ((Vad) && (Vad->u.VadFlags.Spare == 1)) return;
/* Now we should have a valid PDE, mapped in, and still have some VA */
ASSERT(PointerPde->u.Hard.Valid == 1);
ASSERT(Va <= EndingAddress);
- UsedPageTableEntries = &MmWorkingSetList->UsedPageTableEntries[MiGetPdeOffset(Va)];
/* Check if this is a section VAD with gaps in it */
if ((AddressGap) && (LastPrototypePte))
TempPte = *PointerPte;
if (TempPte.u.Long)
{
- *UsedPageTableEntries -= 1;
- ASSERT((*UsedPageTableEntries) < PTE_COUNT);
+ MiDecrementPageTableReferences((PVOID)Va);
/* Check if the PTE is actually mapped in */
- if (TempPte.u.Long & 0xFFFFFC01)
+ if (MI_IS_MAPPED_PTE(&TempPte))
{
/* Are we dealing with section VAD? */
if ((LastPrototypePte) && (PrototypePte > LastPrototypePte))
(TempPte.u.Soft.Prototype == 1))
{
/* Just nuke it */
- PointerPte->u.Long = 0;
+ MI_ERASE_PTE(PointerPte);
}
else
{
else
{
/* The PTE was never mapped, just nuke it here */
- PointerPte->u.Long = 0;
+ MI_ERASE_PTE(PointerPte);
}
}
/* The PDE should still be valid at this point */
ASSERT(PointerPde->u.Hard.Valid == 1);
- if (*UsedPageTableEntries == 0)
+ /* Check remaining PTE count (go back 1 page due to above loop) */
+ if (MiQueryPageTableReferences((PVOID)(Va - PAGE_SIZE)) == 0)
{
if (PointerPde->u.Long != 0)
{
//
// Return the error
//
- return STATUS_WORKING_SET_QUOTA;
+ _SEH2_YIELD(return STATUS_WORKING_SET_QUOTA);
}
//
KeStackAttachProcess(&TargetProcess->Pcb, &ApcState);
}
+ /* Lock the address space and make sure the process isn't already dead */
+ MmLockAddressSpace(&TargetProcess->Vm);
+ if (TargetProcess->VmDeleted)
+ {
+ /* Unlock the address space of the process */
+ MmUnlockAddressSpace(&TargetProcess->Vm);
+
+ /* Check if we were attached */
+ if (ProcessHandle != NtCurrentProcess())
+ {
+ /* Detach and dereference the process */
+ KeUnstackDetachProcess(&ApcState);
+ ObDereferenceObject(TargetProcess);
+ }
+
+ /* Bail out */
+ DPRINT1("Process is dying\n");
+ return STATUS_PROCESS_IS_TERMINATING;
+ }
+
/* Loop the VADs */
ASSERT(TargetProcess->VadRoot.NumberGenericTableElements);
if (TargetProcess->VadRoot.NumberGenericTableElements)
MemoryInfo.RegionSize = (PCHAR)MM_HIGHEST_VAD_ADDRESS + 1 - (PCHAR)Address;
}
+ /* Unlock the address space of the process */
+ MmUnlockAddressSpace(&TargetProcess->Vm);
+
/* Check if we were attached */
if (ProcessHandle != NtCurrentProcess())
{
MemoryInfo.Type = MEM_MAPPED;
}
- /* Lock the address space of the process */
- MmLockAddressSpace(&TargetProcess->Vm);
-
/* Find the memory area the specified address belongs to */
MemoryArea = MmLocateMemoryAreaByAddress(&TargetProcess->Vm, BaseAddress);
ASSERT(MemoryArea != NULL);
if (MemoryArea->Type == MEMORY_AREA_SECTION_VIEW)
{
Status = MmQuerySectionView(MemoryArea, BaseAddress, &MemoryInfo, &ResultLength);
- ASSERT(NT_SUCCESS(Status));
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("MmQuerySectionView failed. MemoryArea=%p (%p-%p), BaseAddress=%p\n",
+ MemoryArea, MemoryArea->StartingAddress, MemoryArea->EndingAddress, BaseAddress);
+ NT_ASSERT(NT_SUCCESS(Status));
+ }
}
else
{
ObDereferenceObject(TargetProcess);
}
- /* Return the data, NtQueryInformation already probed it*/
+ /* Return the data, NtQueryInformation already probed it */
if (PreviousMode != KernelMode)
{
_SEH2_TRY
ASSERT(PteContents.u.Soft.Transition == 0);
/* The PTE is already demand-zero, just update the protection mask */
- PointerPte->u.Soft.Protection = ProtectionMask;
+ PteContents.u.Soft.Protection = ProtectionMask;
+ MI_WRITE_INVALID_PTE(PointerPte, PteContents);
ASSERT(PointerPte->u.Long != 0);
}
return Status;
}
+FORCEINLINE
+BOOLEAN
+MI_IS_LOCKED_VA(
+ PMMPFN Pfn1,
+ ULONG LockType)
+{
+ // HACK until we have proper WSLIST support
+ PMMWSLE Wsle = &Pfn1->Wsle;
+
+ if ((LockType & MAP_PROCESS) && (Wsle->u1.e1.LockedInWs))
+ return TRUE;
+ if ((LockType & MAP_SYSTEM) && (Wsle->u1.e1.LockedInMemory))
+ return TRUE;
+
+ return FALSE;
+}
+
+FORCEINLINE
+VOID
+MI_LOCK_VA(
+ PMMPFN Pfn1,
+ ULONG LockType)
+{
+ // HACK until we have proper WSLIST support
+ PMMWSLE Wsle = &Pfn1->Wsle;
+
+ if (!Wsle->u1.e1.LockedInWs &&
+ !Wsle->u1.e1.LockedInMemory)
+ {
+ MiReferenceProbedPageAndBumpLockCount(Pfn1);
+ }
+
+ if (LockType & MAP_PROCESS)
+ Wsle->u1.e1.LockedInWs = 1;
+ if (LockType & MAP_SYSTEM)
+ Wsle->u1.e1.LockedInMemory = 1;
+}
+
+FORCEINLINE
+VOID
+MI_UNLOCK_VA(
+ PMMPFN Pfn1,
+ ULONG LockType)
+{
+ // HACK until we have proper WSLIST support
+ PMMWSLE Wsle = &Pfn1->Wsle;
+
+ if (LockType & MAP_PROCESS)
+ Wsle->u1.e1.LockedInWs = 0;
+ if (LockType & MAP_SYSTEM)
+ Wsle->u1.e1.LockedInMemory = 0;
+
+ if (!Wsle->u1.e1.LockedInWs &&
+ !Wsle->u1.e1.LockedInMemory)
+ {
+ MiDereferencePfnAndDropLockCount(Pfn1);
+ }
+}
+
+static
+NTSTATUS
+MiCheckVadsForLockOperation(
+ _Inout_ PVOID *BaseAddress,
+ _Inout_ PSIZE_T RegionSize,
+ _Inout_ PVOID *EndAddress)
+
+{
+ PMMVAD Vad;
+ PVOID CurrentVa;
+
+ /* Get the base address and align the start address */
+ *EndAddress = (PUCHAR)*BaseAddress + *RegionSize;
+ *EndAddress = ALIGN_UP_POINTER_BY(*EndAddress, PAGE_SIZE);
+ *BaseAddress = ALIGN_DOWN_POINTER_BY(*BaseAddress, PAGE_SIZE);
+
+ /* First loop and check all VADs */
+ CurrentVa = *BaseAddress;
+ while (CurrentVa < *EndAddress)
+ {
+ /* Get VAD */
+ Vad = MiLocateAddress(CurrentVa);
+ if (Vad == NULL)
+ {
+ /// FIXME: this might be a memory area for a section view...
+ return STATUS_ACCESS_VIOLATION;
+ }
+
+ /* Check VAD type */
+ if ((Vad->u.VadFlags.VadType != VadNone) &&
+ (Vad->u.VadFlags.VadType != VadImageMap) &&
+ (Vad->u.VadFlags.VadType != VadWriteWatch))
+ {
+ *EndAddress = CurrentVa;
+ *RegionSize = (PUCHAR)*EndAddress - (PUCHAR)*BaseAddress;
+ return STATUS_INCOMPATIBLE_FILE_MAP;
+ }
+
+ CurrentVa = (PVOID)((Vad->EndingVpn + 1) << PAGE_SHIFT);
+ }
+
+ *RegionSize = (PUCHAR)*EndAddress - (PUCHAR)*BaseAddress;
+ return STATUS_SUCCESS;
+}
+
+static
+NTSTATUS
+MiLockVirtualMemory(
+ IN OUT PVOID *BaseAddress,
+ IN OUT PSIZE_T RegionSize,
+ IN ULONG MapType)
+{
+ PEPROCESS CurrentProcess;
+ PMMSUPPORT AddressSpace;
+ PVOID CurrentVa, EndAddress;
+ PMMPTE PointerPte, LastPte;
+ PMMPDE PointerPde;
+#if (_MI_PAGING_LEVELS >= 3)
+ PMMPDE PointerPpe;
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ PMMPDE PointerPxe;
+#endif
+ PMMPFN Pfn1;
+ NTSTATUS Status, TempStatus;
+
+ /* Lock the address space */
+ AddressSpace = MmGetCurrentAddressSpace();
+ MmLockAddressSpace(AddressSpace);
+
+ /* Make sure we still have an address space */
+ CurrentProcess = PsGetCurrentProcess();
+ if (CurrentProcess->VmDeleted)
+ {
+ Status = STATUS_PROCESS_IS_TERMINATING;
+ goto Cleanup;
+ }
+
+ /* Check the VADs in the requested range */
+ Status = MiCheckVadsForLockOperation(BaseAddress, RegionSize, &EndAddress);
+ if (!NT_SUCCESS(Status))
+ {
+ goto Cleanup;
+ }
+
+ /* Enter SEH for probing */
+ _SEH2_TRY
+ {
+ /* Loop all pages and probe them */
+ CurrentVa = *BaseAddress;
+ while (CurrentVa < EndAddress)
+ {
+ (void)(*(volatile CHAR*)CurrentVa);
+ CurrentVa = (PUCHAR)CurrentVa + PAGE_SIZE;
+ }
+ }
+ _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
+ {
+ Status = _SEH2_GetExceptionCode();
+ goto Cleanup;
+ }
+ _SEH2_END;
+
+ /* All pages were accessible, since we hold the address space lock, nothing
+ can be de-committed. Assume success for now. */
+ Status = STATUS_SUCCESS;
+
+ /* Get the PTE and PDE */
+ PointerPte = MiAddressToPte(*BaseAddress);
+ PointerPde = MiAddressToPde(*BaseAddress);
+#if (_MI_PAGING_LEVELS >= 3)
+ PointerPpe = MiAddressToPpe(*BaseAddress);
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ PointerPxe = MiAddressToPxe(*BaseAddress);
+#endif
+
+ /* Get the last PTE */
+ LastPte = MiAddressToPte((PVOID)((ULONG_PTR)EndAddress - 1));
+
+ /* Lock the process working set */
+ MiLockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
+
+ /* Loop the pages */
+ do
+ {
+ /* Check for a page that is not accessible */
+ while (
+#if (_MI_PAGING_LEVELS == 4)
+ (PointerPxe->u.Hard.Valid == 0) ||
+#endif
+#if (_MI_PAGING_LEVELS >= 3)
+ (PointerPpe->u.Hard.Valid == 0) ||
+#endif
+ (PointerPde->u.Hard.Valid == 0) ||
+ (PointerPte->u.Hard.Valid == 0))
+ {
+ /* Release process working set */
+ MiUnlockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
+
+ /* Access the page */
+ CurrentVa = MiPteToAddress(PointerPte);
+
+ //HACK: Pass a placeholder TrapInformation so the fault handler knows we're unlocked
+ TempStatus = MmAccessFault(TRUE, CurrentVa, KernelMode, (PVOID)0xBADBADA3);
+ if (!NT_SUCCESS(TempStatus))
+ {
+ // This should only happen, when remote backing storage is not accessible
+ ASSERT(FALSE);
+ Status = TempStatus;
+ goto Cleanup;
+ }
+
+ /* Lock the process working set */
+ MiLockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
+ }
+
+ /* Get the PFN */
+ Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(PointerPte));
+ ASSERT(Pfn1 != NULL);
+
+ /* Check the previous lock status */
+ if (MI_IS_LOCKED_VA(Pfn1, MapType))
+ {
+ Status = STATUS_WAS_LOCKED;
+ }
+
+ /* Lock it */
+ MI_LOCK_VA(Pfn1, MapType);
+
+ /* Go to the next PTE */
+ PointerPte++;
+
+ /* Check if we're on a PDE boundary */
+ if (MiIsPteOnPdeBoundary(PointerPte)) PointerPde++;
+#if (_MI_PAGING_LEVELS >= 3)
+ if (MiIsPteOnPpeBoundary(PointerPte)) PointerPpe++;
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ if (MiIsPteOnPxeBoundary(PointerPte)) PointerPxe++;
+#endif
+ } while (PointerPte <= LastPte);
+
+ /* Release process working set */
+ MiUnlockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
+
+Cleanup:
+ /* Unlock address space */
+ MmUnlockAddressSpace(AddressSpace);
+
+ return Status;
+}
+
NTSTATUS
NTAPI
NtLockVirtualMemory(IN HANDLE ProcessHandle,
}
//
- // Oops :(
+ // Call the internal function
//
- UNIMPLEMENTED;
+ Status = MiLockVirtualMemory(&CapturedBaseAddress,
+ &CapturedBytesToLock,
+ MapType);
//
// Detach if needed
// Return data to user
//
*BaseAddress = CapturedBaseAddress;
- *NumberOfBytesToLock = 0;
+ *NumberOfBytesToLock = CapturedBytesToLock;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
//
// Return status
//
- return STATUS_SUCCESS;
+ return Status;
+}
+
+
+static
+NTSTATUS
+MiUnlockVirtualMemory(
+ IN OUT PVOID *BaseAddress,
+ IN OUT PSIZE_T RegionSize,
+ IN ULONG MapType)
+{
+ PEPROCESS CurrentProcess;
+ PMMSUPPORT AddressSpace;
+ PVOID EndAddress;
+ PMMPTE PointerPte, LastPte;
+ PMMPDE PointerPde;
+#if (_MI_PAGING_LEVELS >= 3)
+ PMMPDE PointerPpe;
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ PMMPDE PointerPxe;
+#endif
+ PMMPFN Pfn1;
+ NTSTATUS Status;
+
+ /* Lock the address space */
+ AddressSpace = MmGetCurrentAddressSpace();
+ MmLockAddressSpace(AddressSpace);
+
+ /* Make sure we still have an address space */
+ CurrentProcess = PsGetCurrentProcess();
+ if (CurrentProcess->VmDeleted)
+ {
+ Status = STATUS_PROCESS_IS_TERMINATING;
+ goto Cleanup;
+ }
+
+ /* Check the VADs in the requested range */
+ Status = MiCheckVadsForLockOperation(BaseAddress, RegionSize, &EndAddress);
+
+ /* Note: only bail out, if we hit an area without a VAD. If we hit an
+ incompatible VAD we continue, like Windows does */
+ if (Status == STATUS_ACCESS_VIOLATION)
+ {
+ Status = STATUS_NOT_LOCKED;
+ goto Cleanup;
+ }
+
+ /* Get the PTE and PDE */
+ PointerPte = MiAddressToPte(*BaseAddress);
+ PointerPde = MiAddressToPde(*BaseAddress);
+#if (_MI_PAGING_LEVELS >= 3)
+ PointerPpe = MiAddressToPpe(*BaseAddress);
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ PointerPxe = MiAddressToPxe(*BaseAddress);
+#endif
+
+ /* Get the last PTE */
+ LastPte = MiAddressToPte((PVOID)((ULONG_PTR)EndAddress - 1));
+
+ /* Lock the process working set */
+ MiLockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
+
+ /* Loop the pages */
+ do
+ {
+ /* Check for a page that is not present */
+ if (
+#if (_MI_PAGING_LEVELS == 4)
+ (PointerPxe->u.Hard.Valid == 0) ||
+#endif
+#if (_MI_PAGING_LEVELS >= 3)
+ (PointerPpe->u.Hard.Valid == 0) ||
+#endif
+ (PointerPde->u.Hard.Valid == 0) ||
+ (PointerPte->u.Hard.Valid == 0))
+ {
+ /* Remember it, but keep going */
+ Status = STATUS_NOT_LOCKED;
+ }
+ else
+ {
+ /* Get the PFN */
+ Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(PointerPte));
+ ASSERT(Pfn1 != NULL);
+
+ /* Check if all of the requested locks are present */
+ if (((MapType & MAP_SYSTEM) && !MI_IS_LOCKED_VA(Pfn1, MAP_SYSTEM)) ||
+ ((MapType & MAP_PROCESS) && !MI_IS_LOCKED_VA(Pfn1, MAP_PROCESS)))
+ {
+ /* Remember it, but keep going */
+ Status = STATUS_NOT_LOCKED;
+
+ /* Check if no lock is present */
+ if (!MI_IS_LOCKED_VA(Pfn1, MAP_PROCESS | MAP_SYSTEM))
+ {
+ DPRINT1("FIXME: Should remove the page from WS\n");
+ }
+ }
+ }
+
+ /* Go to the next PTE */
+ PointerPte++;
+
+ /* Check if we're on a PDE boundary */
+ if (MiIsPteOnPdeBoundary(PointerPte)) PointerPde++;
+#if (_MI_PAGING_LEVELS >= 3)
+ if (MiIsPteOnPpeBoundary(PointerPte)) PointerPpe++;
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ if (MiIsPteOnPxeBoundary(PointerPte)) PointerPxe++;
+#endif
+ } while (PointerPte <= LastPte);
+
+ /* Check if we hit a page that was not locked */
+ if (Status == STATUS_NOT_LOCKED)
+ {
+ goto CleanupWithWsLock;
+ }
+
+ /* All pages in the region were locked, so unlock them all */
+
+ /* Get the PTE and PDE */
+ PointerPte = MiAddressToPte(*BaseAddress);
+ PointerPde = MiAddressToPde(*BaseAddress);
+#if (_MI_PAGING_LEVELS >= 3)
+ PointerPpe = MiAddressToPpe(*BaseAddress);
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ PointerPxe = MiAddressToPxe(*BaseAddress);
+#endif
+
+ /* Loop the pages */
+ do
+ {
+ /* Unlock it */
+ Pfn1 = MiGetPfnEntry(PFN_FROM_PTE(PointerPte));
+ MI_UNLOCK_VA(Pfn1, MapType);
+
+ /* Go to the next PTE */
+ PointerPte++;
+
+ /* Check if we're on a PDE boundary */
+ if (MiIsPteOnPdeBoundary(PointerPte)) PointerPde++;
+#if (_MI_PAGING_LEVELS >= 3)
+ if (MiIsPteOnPpeBoundary(PointerPte)) PointerPpe++;
+#endif
+#if (_MI_PAGING_LEVELS == 4)
+ if (MiIsPteOnPxeBoundary(PointerPte)) PointerPxe++;
+#endif
+ } while (PointerPte <= LastPte);
+
+ /* Everything is done */
+ Status = STATUS_SUCCESS;
+
+CleanupWithWsLock:
+
+ /* Release process working set */
+ MiUnlockProcessWorkingSet(CurrentProcess, PsGetCurrentThread());
+
+Cleanup:
+ /* Unlock address space */
+ MmUnlockAddressSpace(AddressSpace);
+
+ return Status;
}
+
NTSTATUS
NTAPI
NtUnlockVirtualMemory(IN HANDLE ProcessHandle,
}
//
- // Oops :(
+ // Call the internal function
//
- UNIMPLEMENTED;
+ Status = MiUnlockVirtualMemory(&CapturedBaseAddress,
+ &CapturedBytesToUnlock,
+ MapType);
//
// Detach if needed
//
// Return data to user
//
- *BaseAddress = PAGE_ALIGN(CapturedBaseAddress);
- *NumberOfBytesToUnlock = 0;
+ *BaseAddress = CapturedBaseAddress;
+ *NumberOfBytesToUnlock = CapturedBytesToUnlock;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
//
// Catch illegal base address
//
- if (BaseAddress > MM_HIGHEST_USER_ADDRESS) return STATUS_INVALID_PARAMETER_2;
+ if (BaseAddress > MM_HIGHEST_USER_ADDRESS) _SEH2_YIELD(return STATUS_INVALID_PARAMETER_2);
//
// Catch illegal region size
//
// Fail
//
- return STATUS_INVALID_PARAMETER_3;
+ _SEH2_YIELD(return STATUS_INVALID_PARAMETER_3);
}
//
//
// Must have a count
//
- if (CapturedEntryCount == 0) return STATUS_INVALID_PARAMETER_5;
+ if (CapturedEntryCount == 0) _SEH2_YIELD(return STATUS_INVALID_PARAMETER_5);
//
// Can't be larger than the maximum
//
// Fail
//
- return STATUS_INVALID_PARAMETER_5;
+ _SEH2_YIELD(return STATUS_INVALID_PARAMETER_5);
}
//
Status = STATUS_CONFLICTING_ADDRESSES;
goto FailPath;
}
-
+
if ((AllocationType & MEM_RESET) == MEM_RESET)
{
/// @todo HACK: pretend success
//
TempPte.u.Long = 0;
TempPte.u.Soft.Protection = ProtectionMask;
+ NT_ASSERT(TempPte.u.Long != 0);
//
// Get the PTE, PDE and the last PTE for this address range
PMEMORY_AREA MemoryArea;
SIZE_T PRegionSize;
PVOID PBaseAddress;
- ULONG_PTR CommitReduction = 0;
+ LONG_PTR CommitReduction = 0;
ULONG_PTR StartingAddress, EndingAddress;
PMMVAD Vad;
NTSTATUS Status;
return Status;
}
+
+PHYSICAL_ADDRESS
+NTAPI
+MmGetPhysicalAddress(PVOID Address)
+{
+ PHYSICAL_ADDRESS PhysicalAddress;
+ MMPDE TempPde;
+ MMPTE TempPte;
+
+ /* Check if the PXE/PPE/PDE is valid */
+ if (
+#if (_MI_PAGING_LEVELS == 4)
+ (MiAddressToPxe(Address)->u.Hard.Valid) &&
+#endif
+#if (_MI_PAGING_LEVELS >= 3)
+ (MiAddressToPpe(Address)->u.Hard.Valid) &&
+#endif
+ (MiAddressToPde(Address)->u.Hard.Valid))
+ {
+ /* Check for large pages */
+ TempPde = *MiAddressToPde(Address);
+ if (TempPde.u.Hard.LargePage)
+ {
+ /* Physical address is base page + large page offset */
+ PhysicalAddress.QuadPart = TempPde.u.Hard.PageFrameNumber << PAGE_SHIFT;
+ PhysicalAddress.QuadPart += ((ULONG_PTR)Address & (PAGE_SIZE * PTE_PER_PAGE - 1));
+ return PhysicalAddress;
+ }
+
+ /* Check if the PTE is valid */
+ TempPte = *MiAddressToPte(Address);
+ if (TempPte.u.Hard.Valid)
+ {
+ /* Physical address is base page + page offset */
+ PhysicalAddress.QuadPart = TempPte.u.Hard.PageFrameNumber << PAGE_SHIFT;
+ PhysicalAddress.QuadPart += ((ULONG_PTR)Address & (PAGE_SIZE - 1));
+ return PhysicalAddress;
+ }
+ }
+
+ DPRINT1("MM:MmGetPhysicalAddressFailed base address was %p\n", Address);
+ PhysicalAddress.QuadPart = 0;
+ return PhysicalAddress;
+}
+
+
/* EOF */
projects / reactos.git / blobdiff