read_c0_intctl
cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7;
cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7;
cp0_fdc_irq = (read_c0_intctl() >> INTCTLB_IPFDC) & 7;