CIU3_IDT_CTL
cvmx_write_csr(b + CIU3_IDT_CTL(idt_ip2), 0);
cvmx_write_csr(b + CIU3_IDT_CTL(idt_ip3), 1);
cvmx_write_csr(b + CIU3_IDT_CTL(idt_ip4), 2);
cvmx_write_csr(b + CIU3_IDT_CTL(unused_idt2), 0);