VR_INTRS
if ((status & VR_INTRS) == 0)
if (status == 0 || status == 0xffff || (status & VR_INTRS) == 0)
for (; (status & VR_INTRS) != 0;) {
CSR_WRITE_2(sc, VR_IMR, VR_INTRS);
CSR_WRITE_2(sc, VR_IMR, VR_INTRS);
CSR_WRITE_2(sc, VR_IMR, VR_INTRS);