Typedefs starting with `s' in osfmk/ppc

• savearea osfmk/ppc/exception.h:393
• savectl osfmk/ppc/exception.h:401
• screen_event_t osfmk/ppc/screen.h:126
• screen_evque_t osfmk/ppc/screen.h:144
• screen_hw_info_t osfmk/ppc/screen.h:313
• screen_point_t osfmk/ppc/screen.h:150
• screen_rect_t osfmk/ppc/screen.h:158
• screen_softc_t osfmk/ppc/screen_switch.h:86
• screen_timed_point_t osfmk/ppc/screen.h:132
• sdr1_t osfmk/ppc/proc_reg.h:238