NTSTATUS NTAPI MmpAccessFault	(	KPROCESSOR_MODE	Mode,
		ULONG_PTR	Address,
		BOOLEAN	FromMdl
	)
Definition at line 23 of file mmfault.c.
Referenced by MmAccessFault().
{
   PMMSUPPORT AddressSpace;
   MEMORY_AREA* MemoryArea;
   NTSTATUS Status;

   DPRINT("MmAccessFault(Mode %d, Address %x)\n", Mode, Address);

   if (KeGetCurrentIrql() >= DISPATCH_LEVEL)
   {
      DPRINT1("Page fault at high IRQL was %d\n", KeGetCurrentIrql());
      return(STATUS_UNSUCCESSFUL);
   }

   /*
    * Find the memory area for the faulting address
    */
   if (Address >= (ULONG_PTR)MmSystemRangeStart)
   {
      /*
       * Check permissions
       */
      if (Mode != KernelMode)
      {
         DPRINT1("MmAccessFault(Mode %d, Address %x)\n", Mode, Address);
         return(STATUS_ACCESS_VIOLATION);
      }
      AddressSpace = MmGetKernelAddressSpace();
   }
   else
   {
      AddressSpace = &PsGetCurrentProcess()->Vm;
   }

   if (!FromMdl)
   {
      MmLockAddressSpace(AddressSpace);
   }
   do
   {
      MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, (PVOID)Address);
      if (MemoryArea == NULL || MemoryArea->DeleteInProgress)
      {
         if (!FromMdl)
         {
            MmUnlockAddressSpace(AddressSpace);
         }
         return (STATUS_ACCESS_VIOLATION);
      }

      switch (MemoryArea->Type)
      {
         case MEMORY_AREA_SECTION_VIEW:
            Status = MmAccessFaultSectionView(AddressSpace,
                                              MemoryArea,
                                              (PVOID)Address);
            break;

         case MEMORY_AREA_CACHE:
            // This code locks for itself to keep from having to break a lock
            // passed in.
            if (!FromMdl)
               MmUnlockAddressSpace(AddressSpace);
            Status = MmAccessFaultCacheSection(Mode, Address, FromMdl);
            if (!FromMdl)
               MmLockAddressSpace(AddressSpace);
            break;

         default:
            Status = STATUS_ACCESS_VIOLATION;
            break;
      }
   }
   while (Status == STATUS_MM_RESTART_OPERATION);

   DPRINT("Completed page fault handling\n");
   if (!FromMdl)
   {
      MmUnlockAddressSpace(AddressSpace);
   }
   return(Status);
}
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