drivers/base/nmidebug/nmidebug.c

   1 /*
   2  * PROJECT:         ReactOS NMI Debug Driver
   3  * LICENSE:         BSD - See COPYING.ARM in the top level directory
   4  * FILE:            drivers/base/nmidebug/nmidebug.c
   5  * PURPOSE:         Driver Code
   6  * PROGRAMMERS:     ReactOS Portable Systems Group
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include <ntifs.h>
  12 #include <ntndk.h>
  13
  14 /* FUNCTIONS ******************************************************************/
  15
  16 PCHAR NmiBegin = "NMI2NMI1";
  17
  18 BOOLEAN
  19 NTAPI
  20 NmiDbgCallback(IN PVOID Context,
  21                IN BOOLEAN Handled)
  22 {
  23     /* Clear the NMI flag */
  24     ((PCHAR)&KiBugCheckData[4])[3] -= NmiBegin[3];
  25
  26     /* Get NMI status signature */
  27     __indwordstring(0x80, (PULONG)NmiBegin, 1);
  28     ((void(*)())&KiBugCheckData[4])();
  29
  30     /* Handle the NMI safely */
  31     KiEnableTimerWatchdog = strcmp(NmiBegin, NmiBegin + 4);
  32     return TRUE;
  33 }
  34
  35 NTSTATUS
  36 NTAPI
  37 DriverEntry(IN PDRIVER_OBJECT DriverObject,
  38             IN PUNICODE_STRING RegistryPath)
  39 {
  40     PAGED_CODE();
  41
  42     /* Register NMI callback */
  43     KeRegisterNmiCallback(&NmiDbgCallback, NULL);
  44
  45     /* Return success */
  46     return STATUS_SUCCESS;
  47 }
  48
  49 /* EOF */