HPET_TIMER_N_INT_ENB_CNF_BIT
if (ret & HPET_TIMER_N_INT_ENB_CNF_BIT) {
ret &= ~HPET_TIMER_N_INT_ENB_CNF_BIT;
l &= ~HPET_TIMER_N_INT_ENB_CNF_BIT;
l |= HPET_TIMER_N_INT_ENB_CNF_BIT;
conf &= ~HPET_TIMER_N_INT_ENB_CNF_BIT; /* disabled */