reactos/ntoskrnl/mm/powerpc/pfault.c

   1 /* $Id: pfault.c 24443 2006-10-08 10:01:27Z arty $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/mm/powerpc/pfault.c
   6  * PURPOSE:         Paging file functions
   7  *
   8  * PROGRAMMERS:     David Welch (welch@mcmail.com)
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <ntoskrnl.h>
  14 #define NDEBUG
  15 #include <internal/debug.h>
  16 #include <ppcmmu/mmu.h>
  17
  18 /* EXTERNS *******************************************************************/
  19
  20 extern ULONG KiKernelTrapHandler(PKTRAP_FRAME Tf, ULONG ExceptionNr, PVOID Cr2);
  21
  22 /* FUNCTIONS *****************************************************************/
  23
  24 VOID MmpPpcTrapFrameToTrapFrame(ppc_trap_frame_t *frame, PKTRAP_FRAME Tf)
  25 {
  26     RtlCopyMemory(&Tf->Gpr0, frame->gpr, 12 * sizeof(ULONG));
  27     Tf->Lr = frame->lr;
  28     Tf->Cr = frame->cr;
  29     Tf->Ctr = frame->ctr;
  30     Tf->Xer = frame->xer;
  31     Tf->Msr = frame->srr1 & 0xffff;
  32     Tf->Dr0 = frame->srr0;
  33     Tf->Dr1 = frame->srr1;
  34     Tf->Dr2 = frame->dar;
  35     Tf->Dr3 = frame->dsisr;
  36 }
  37
  38 int KiPageFaultHandler(int trap, ppc_trap_frame_t *frame)
  39 {
  40     NTSTATUS Status = STATUS_SUCCESS;
  41     KPROCESSOR_MODE Mode;
  42     EXCEPTION_RECORD Er;
  43     KTRAP_FRAME Tf;
  44     BOOLEAN AccessFault = !!(frame->dsisr & (1<<28));
  45     vaddr_t VirtualAddr;
  46     PVOID TrapInfo = NULL;
  47
  48     /* get the faulting address */
  49     if (trap == 4) /* Instruction miss */
  50         VirtualAddr = frame->srr0;
  51     else /* Data miss */
  52         VirtualAddr = frame->dar;
  53
  54     /* MSR_PR */
  55     Mode = frame->srr1 & 0x4000 ? KernelMode : UserMode;
  56
  57     /* handle the fault */
  58     if (AccessFault)
  59     {
  60         Status = MmAccessFault(Mode, (PVOID)VirtualAddr, FALSE, TrapInfo);
  61     }
  62     else
  63     {
  64         KeBugCheck(0);
  65         //Status = MmNotPresentFault(Mode, (PVOID)VirtualAddr, FALSE, TrapInfo);
  66     }
  67
  68     if (NT_SUCCESS(Status))
  69         return 1;
  70
  71     if (KeGetCurrentThread()->ApcState.UserApcPending)
  72     {
  73         KIRQL oldIrql;
  74
  75         KeRaiseIrql(APC_LEVEL, &oldIrql);
  76         KiDeliverApc(UserMode, NULL, NULL);
  77         KeLowerIrql(oldIrql);
  78     }
  79
  80     MmpPpcTrapFrameToTrapFrame(frame, &Tf);
  81
  82     Er.ExceptionCode = STATUS_ACCESS_VIOLATION;
  83     Er.ExceptionFlags = 0;
  84     Er.ExceptionRecord = NULL;
  85     Er.ExceptionAddress = (PVOID)frame->srr0;
  86     Er.NumberParameters = 2;
  87     Er.ExceptionInformation[0] = AccessFault;
  88     Er.ExceptionInformation[1] = VirtualAddr;
  89
  90     /* FIXME: Which exceptions are noncontinuable? */
  91     Er.ExceptionFlags = 0;
  92
  93     KiDispatchException(&Er, 0, &Tf, Mode, TRUE);
  94     return 1;
  95 }
  96