read_gc0_cause
u32 old_cause = read_gc0_cause();
*v = (long)read_gc0_cause();
if ((read_gc0_cause() ^ v) & CAUSEF_DC) {
kvm_mips_deliver_interrupts(vcpu, read_gc0_cause());
read_gc0_cause());
cause = read_gc0_cause();
cause = read_gc0_cause();