ddi_compatible_driver_major
major = ddi_compatible_driver_major(dsearch, NULL);
major = ddi_compatible_driver_major(dip, NULL);
major = ddi_compatible_driver_major(dip, &p);
ddi_compatible_driver_major(dev_info_t *dip, char **formp);
if (ddi_compatible_driver_major(dip, NULL) == (major_t)-1) {