clockfns
(*clockfns->cf_init)(clockdev);
const struct clockfns *clockfns;
clockattach(device_t dev, const struct clockfns *fns)
if (clockfns != NULL)
clockfns = fns;
if (clockfns == NULL)
void clockattach(device_t, const struct clockfns *);
const struct clockfns mcclock_clockfns = {