dev2unit
#define DEV2UNIT(x) ((dev2unit(x) & 0xff00) >> 8)
#define DEV2SUB(x) (dev2unit(x) & 0xff)
#define DEV_FWMEM(x) (dev2unit(x) & FWMEM_FLAG)
cpu = dev2unit(ap->a_head.a_dev);
int cpu = dev2unit(ap->a_head.a_dev);
kbd_get_keyboard(kbd_find_keyboard(KEYBOARD_NAME, dev2unit(d)))
int unit = dev2unit(dev), error;
SND_CLONE_ASSERT(ce->unit == dev2unit(dev),
ce->unit, dev2unit(dev)));
#define MIDIUNIT(y) ((dev2unit(y) >> 4) & 0x0f)
#define MIDIDEV(y) (dev2unit(y) & 0x0f)
wdevunit = dev2unit(i_dev);
rdevunit = dev2unit(i_dev);
unit = dev2unit(dev);