clockreg
struct clockreg *cl = clockreg;
static struct clockreg *clockreg = (struct clockreg *)CLOCK_ADDR;
uint32_t q, clockreg;
clockreg = regr(sc, CLOCK_CNTL);
clockreg &= ~CLOCK_SEL;
clockreg |= sc->sc_clock | CLOCK_STROBE;
regw(sc, CLOCK_CNTL, clockreg);