PCIR_STATUS
sts = pci_get_cfgdata16(pi, PCIR_STATUS);
pci_set_cfgdata16(pi, PCIR_STATUS, sts|PCIM_STATUS_CAPPRESENT);
sts = pci_get_cfgdata16(pi, PCIR_STATUS);
sts = passthru_read_config(sc, PCIR_STATUS, 2);
*rv = passthru_read_config(sc, PCIR_STATUS, 2) << 16 |
passthru_write_config(sc, PCIR_STATUS, 2, val >> 16);