AT_ERROR
ata_ctlp->ac_error = (uchar_t *)ioaddr1 + AT_ERROR;
ddi_get8(io_hdl1, (uchar_t *)ioaddr1 + AT_ERROR)));
ddi_get8(io_hdl1, (uchar_t *)ioaddr1 + AT_ERROR)));
ddi_get8(io_hdl1, (uchar_t *)ioaddr1 + AT_ERROR)));
ddi_get8(io_hdl1, (uchar_t *)ioaddr1 + AT_ERROR)));