func: static void register_core_rtas(void)
  
  {
  
      spapr_rtas_register("display-character", rtas_display_character);
  
      spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
  
      spapr_rtas_register("power-off", rtas_power_off);
  
  
  
  
  }