ExpExTimerAttributesAreValid

UINT8 __stdcall ExpExTimerAttributesAreValid(UINT64 Attributes){
  return(Attributes & 0x8000000E) == (_DWORD)Attributes && ((Attributes & 6) == 0 || (Attributes & 8) == 0);
}

Referenced by:

ExAllocateTimerInternal2
NtCreateTimer2