Typedefs starting with `u' in osfmk/ppc

• UInt16 osfmk/ppc/atomic_switch.h:23
• UInt32 osfmk/ppc/atomic_switch.h:24
• UInt8 osfmk/ppc/atomic_switch.h:22
• user_info_t osfmk/ppc/screen.h:253