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58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* PROJECT: ReactOS NMI Debug Driver
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: drivers/base/nmidebug/nmidebug.c
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* PURPOSE: Driver Code
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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/* INCLUDES *******************************************************************/
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#include <ntifs.h>
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#include <ntndk.h>
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/* FUNCTIONS ******************************************************************/
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PCHAR NmiBegin = "NMI4NMI@";
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VOID
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FORCEINLINE
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NmiClearFlag(VOID)
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{
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((PCHAR)&KiBugCheckData[4])[0] -= (NmiBegin[3] | NmiBegin[7]);
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((PCHAR)&KiBugCheckData[4])[3] |= 1;
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__asm__("rcrl %b[shift], %k[retval]" : [retval] "=rm" (KiBugCheckData[4]) : "[retval]" (KiBugCheckData[4]), [shift] "Nc" (8));
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}
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BOOLEAN
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NTAPI
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NmiDbgCallback(IN PVOID Context,
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IN BOOLEAN Handled)
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{
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/* Clear the NMI flag */
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NmiClearFlag();
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/* Get NMI status signature */
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__indwordstring(0x80, (PULONG)NmiBegin, 1);
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((void(*)())&KiBugCheckData[4])();
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/* Handle the NMI safely */
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KiEnableTimerWatchdog = (RtlCompareMemory(NmiBegin, NmiBegin + 4, 4) != 4);
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return TRUE;
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}
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NTSTATUS
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NTAPI
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DriverEntry(IN PDRIVER_OBJECT DriverObject,
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IN PUNICODE_STRING RegistryPath)
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{
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PAGED_CODE();
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/* Register NMI callback */
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KeRegisterNmiCallback(&NmiDbgCallback, NULL);
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/* Return success */
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return STATUS_SUCCESS;
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}
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/* EOF */
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