read_icu
if ((read_icu(INTCTL_ICIP) & 0x1) != 0)
sd.sd_iclr = read_icu(INTCTL_ICLR);
sd.sd_icmr = read_icu(INTCTL_ICMR);
sd.sd_iccr = read_icu(INTCTL_ICCR);
irqbits = read_icu(SAIPIC_IP);
read_icu(SAIPIC_MR) & ~(1U<<irqno));