KeSetTargetProcessorDpcEx

NTSTATUS __stdcall KeSetTargetProcessorDpcEx(_KDPC *Dpc, PROCESSOR_NUMBER *ProcNumber){
  NTSTATUS ProcessorIndexFromNumber; 

  ProcessorIndexFromNumber = KeGetProcessorIndexFromNumber(&ProcNumber->Group);
  if( ProcessorIndexFromNumber == -1 )
    return -1073741811;
  if( !Dpc->DpcData )
    Dpc->Number = ProcessorIndexFromNumber + 1280;
  return 0;
}

Referenced by:

HalpHvInitMcaPcrContext
HalpMcaInitializePcrContext
KeMaskInterrupt
KeSetTargetProcessorDpc