legacy_device
ai->legacy_device = unit;
ai->legacy_device = unit;
ai->legacy_device = unit;
mi->legacy_device = unit;
mi->legacy_device = i;
int legacy_device; /* Obsolete field. Replaced by devnode */
int legacy_device;
struct legacy_device *atdev = DEVTOAT(child);
struct legacy_device *atdev;
atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
struct legacy_device *atdev = DEVTOAT(child);
struct legacy_device *atdev = DEVTOAT(child);
#define DEVTOAT(dev) ((struct legacy_device *)device_get_ivars(dev))