vmebusvec
sc->sc_vec = (struct vmebusvec *)bh;
vec = ihp->sc->sc_vec->vmebusvec[level];
struct vmebusvec *sc_vec; /* VME interrupt vector */
volatile char *addr = &ihp->sc->sc_vec->vmebusvec[level];
volatile uint8_t vmebusvec[16];