UNIT
#define UNIT(x) minor(x)
#define UNIT(dev) (minor(dev) & XLCOM_UNIT_MASK)
#define UNIT(x) (minor(x) & 3)
#define UNIT(x) (minor(x) & 3)
#define UNIT(x) minor(x)
#define UNIT(ctlr, target) ((ctlr) * 10 + (target))
#define UNIT(dev) minor(dev)
#define UNIT(x) minor(x)
#define UNIT(x) minor(x)
#define UNIT(x) minor(x)
#define UNIT(x) ((x) & 0x0f)
#define UNIT(x) (minor((x) & 0x0f))
#define UNIT(x) ((x) & 0x0f)