CLOCK_CNTL
clockreg = regr(sc, CLOCK_CNTL);
regw(sc, CLOCK_CNTL, clockreg);
reg = regr(sc, CLOCK_CNTL);
regw(sc, CLOCK_CNTL, reg);
regw(sc, CLOCK_CNTL, reg);
regw(sc, CLOCK_CNTL, reg);
regwb(sc, CLOCK_CNTL + 1, index << 2);
return regrb(sc, CLOCK_CNTL + 2);
reg = regr(sc, CLOCK_CNTL);
clk_ctl = regr(sc, CLOCK_CNTL);