KeQueryMaximumProcessorCountEx

UINT64 __stdcall KeQueryMaximumProcessorCountEx(UINT16 GroupNumber){
  unsigned __int64 v2; 
  unsigned int v3; 
  if( KeDynamicPartitioningSupported )
  {
    if( GroupNumber == 0xFFFF || !GroupNumber && KiMaximumGroups == 1 )
    {
      return(unsigned int)KeMaximumProcessors;
    }
    else
    {
      v3 = 0;
      if( GroupNumber < (unsigned __int16)KiMaximumGroups )
        return(unsigned int)KiMaximumGroupSize;
      return v3;
    }
  }
  else if( GroupNumber == 0xFFFF )
  {
    return(unsigned int)KeNumberProcessors_0;
  }
  else if( GroupNumber >= (unsigned __int16)KiActiveGroups )
  {
    return 0i64;
  }
  else
  {
    v2 = KeActiveProcessors.Bitmap[GroupNumber]
       - ((KeActiveProcessors.Bitmap[GroupNumber] >> 1) & 0x5555555555555555i64);
    return(0x101010101010101i64
          * (((v2 & 0x3333333333333333i64)
            + ((v2 >> 2) & 0x3333333333333333i64)
            + (((v2 & 0x3333333333333333i64) + ((v2 >> 2) & 0x3333333333333333i64)) >> 4)) & 0xF0F0F0F0F0F0F0Fi64)) >> 56;
  }
}

Referenced by: