KeFrozenProcessorCount

VOID __fastcall KeFrozenProcessorCount(_EJOB *ServerSilo, INT64 ExitStatus){
  int v2; 
  unsigned int i; 
  _KPRCB *Prcb; 

  v2 = 0;
  for( i = 0; i < (unsigned int)KeNumberProcessors_0; ++i )
  {
    Prcb = KeGetPrcb(i);
    if( Prcb )
    {
      if( (Prcb->IpiFrozen & 0xF) == 2 )
        ++v2;
    }
  }
}

Referenced by:

IoInitializeBugCheckProgress
IoUpdateBugCheckProgressEnvVariable