uchar              15 bootmain.c     void readseg(uchar*, uint, uint);
uchar              79 bootmain.c     readseg(uchar* pa, uint count, uint offset)
uchar              80 defs.h         void            lapicstartap(uchar, uint);
uchar             140 lapic.c        lapicstartap(uchar apicid, uint addr)
uchar              27 mp.c           sum(uchar *addr, int len)
uchar              22 x86.h          outb(ushort port, uchar data)