ntoskrnl/mm/powerpc/pfault.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            ntoskrnl/mm/powerpc/pfault.c
   5  * PURPOSE:         Paging file functions
   6  *
   7  * PROGRAMMERS:     David Welch (welch@mcmail.com)
   8  */
   9
  10 /* INCLUDES *****************************************************************/
  11
  12 #include <ntoskrnl.h>
  13 #define NDEBUG
  14 #include <debug.h>
  15 #include <ppcmmu/mmu.h>
  16
  17 /* EXTERNS *******************************************************************/
  18
  19 NTSTATUS
  20 NTAPI
  21 MmNotPresentFault(KPROCESSOR_MODE Mode,
  22                   ULONG_PTR Address,
  23                   BOOLEAN FromMdl);
  24 extern ULONG KiKernelTrapHandler(PKTRAP_FRAME Tf, ULONG ExceptionNr, PVOID Cr2);
  25
  26 /* FUNCTIONS *****************************************************************/
  27
  28 VOID MmpPpcTrapFrameToTrapFrame(ppc_trap_frame_t *frame, PKTRAP_FRAME Tf)
  29 {
  30     RtlCopyMemory(&Tf->Gpr0, frame->gpr, 12 * sizeof(ULONG));
  31     Tf->Lr = frame->lr;
  32     Tf->Cr = frame->cr;
  33     Tf->Ctr = frame->ctr;
  34     Tf->Xer = frame->xer;
  35     Tf->Iar = frame->srr0;
  36     Tf->Msr = frame->srr1 & 0xffff;
  37     Tf->Dr0 = frame->dar;
  38     Tf->Dr1 = frame->dsisr;
  39 }
  40
  41 void CopyFrame(int *oldframe, int *ourframe)
  42 {
  43     int i;
  44
  45     for (i = 0; i < sizeof(ppc_trap_frame_t) / sizeof(int); i++)
  46     {
  47         ourframe[i] = GetPhys((int)&oldframe[i]);
  48     }
  49 }
  50
  51 void KiPageFaultHandler(int trap, ppc_trap_frame_t *frame)
  52 {
  53     NTSTATUS Status = STATUS_SUCCESS;
  54     KPROCESSOR_MODE Mode;
  55     EXCEPTION_RECORD Er;
  56     KTRAP_FRAME Tf;
  57     BOOLEAN AccessFault = !!(frame->dsisr & (1<<28));
  58     vaddr_t VirtualAddr;
  59     PVOID TrapInfo = NULL;
  60
  61     /* get the faulting address */
  62     if (trap == 4) /* Instruction miss */
  63         VirtualAddr = frame->srr0;
  64     else /* Data miss */
  65         VirtualAddr = frame->dar;
  66
  67     /* MSR_PR */
  68     Mode = frame->srr1 & 0x4000 ? UserMode : KernelMode;
  69     DPRINT("Page Fault at %08x\n", frame->srr0);
  70
  71     /* handle the fault */
  72     if (AccessFault)
  73     {
  74         Status = MmAccessFault(Mode, (PVOID)VirtualAddr, FALSE, TrapInfo);
  75     }
  76     else
  77     {
  78         Status = MmNotPresentFault(Mode, VirtualAddr, FALSE);
  79     }
  80
  81     if (NT_SUCCESS(Status))
  82     {
  83         MmuCallbackRet();
  84     }
  85
  86     if (KeGetCurrentThread()->ApcState.UserApcPending)
  87     {
  88         KIRQL oldIrql;
  89
  90         KeRaiseIrql(APC_LEVEL, &oldIrql);
  91         KiDeliverApc(UserMode, NULL, NULL);
  92         KeLowerIrql(oldIrql);
  93     }
  94
  95     MmpPpcTrapFrameToTrapFrame(frame, &Tf);
  96
  97     Er.ExceptionCode = STATUS_ACCESS_VIOLATION;
  98     Er.ExceptionFlags = 0;
  99     Er.ExceptionRecord = NULL;
 100     Er.ExceptionAddress = (PVOID)frame->srr0;
 101     Er.NumberParameters = 2;
 102     Er.ExceptionInformation[0] = AccessFault;
 103     Er.ExceptionInformation[1] = VirtualAddr;
 104
 105     /* FIXME: Which exceptions are noncontinuable? */
 106     Er.ExceptionFlags = 0;
 107
 108     KiDispatchException(&Er, 0, &Tf, Mode, TRUE);
 109     MmuCallbackRet();
 110 }
 111