CLOCK_PRI
oba->oba_pri = CLOCK_PRI;
ca->ca_intpri = CLOCK_PRI;
vec_set_entry(VECI_INTRAV0 + CLOCK_PRI, (void *)_isr_clock);
m68k_count_intr(CLOCK_PRI);
ca->ca_intpri = CLOCK_PRI;
ca->ca_intpri = CLOCK_PRI;
vec_set_entry(VECI_INTRAV0 + CLOCK_PRI, (void *)_isr_clock);
m68k_count_intr(CLOCK_PRI);