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nmidebug.c
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00001 /* 00002 * PROJECT: ReactOS NMI Debug Driver 00003 * LICENSE: BSD - See COPYING.ARM in the top level directory 00004 * FILE: drivers/base/nmidebug/nmidebug.c 00005 * PURPOSE: Driver Code 00006 * PROGRAMMERS: ReactOS Portable Systems Group 00007 */ 00008 00009 /* INCLUDES *******************************************************************/ 00010 00011 #include <ntifs.h> 00012 #include <ndk/ketypes.h> 00013 00014 /* FUNCTIONS ******************************************************************/ 00015 00016 PCHAR NmiBegin = "NMI4NMI@"; 00017 00018 VOID 00019 FORCEINLINE 00020 NmiClearFlag(VOID) 00021 { 00022 ((PCHAR)&KiBugCheckData[4])[0] -= (NmiBegin[3] | NmiBegin[7]); 00023 ((PCHAR)&KiBugCheckData[4])[3] |= 1; 00024 #ifdef _M_IX86 00025 #ifdef _MSC_VER 00026 __asm 00027 { 00028 rcr KiBugCheckData[4], 8 00029 } 00030 #else 00031 __asm__("rcrl %b[shift], %k[retval]" : [retval] "=rm" (KiBugCheckData[4]) : "[retval]" (KiBugCheckData[4]), [shift] "Nc" (8)); 00032 #endif 00033 #endif 00034 } 00035 00036 BOOLEAN 00037 NTAPI 00038 NmiDbgCallback(IN PVOID Context, 00039 IN BOOLEAN Handled) 00040 { 00041 /* Clear the NMI flag */ 00042 NmiClearFlag(); 00043 00044 /* Get NMI status signature */ 00045 __indwordstring(0x80, (PULONG)NmiBegin, 1); 00046 ((void(*)())&KiBugCheckData[4])(); 00047 00048 /* Handle the NMI safely */ 00049 #ifdef _M_IX86 00050 KiEnableTimerWatchdog = (RtlCompareMemory(NmiBegin, NmiBegin + 4, 4) != 4); 00051 #endif 00052 return TRUE; 00053 } 00054 00055 NTSTATUS 00056 NTAPI 00057 DriverEntry(IN PDRIVER_OBJECT DriverObject, 00058 IN PUNICODE_STRING RegistryPath) 00059 { 00060 PAGED_CODE(); 00061 00062 /* Register NMI callback */ 00063 KeRegisterNmiCallback(&NmiDbgCallback, NULL); 00064 00065 /* Return success */ 00066 return STATUS_SUCCESS; 00067 } 00068 00069 /* EOF */
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