writew
#define writew(va, d) (*(volatile uint16_t *) (va) = (d))
#undef writew
writew(uint16_t v, volatile void *addr)
#define writew(v, addr) writew(v, addr)
#define writew(a, v) ofwfb_writew((u_int16_t *)(a), (v))
#define writew(a, v) (*(uint16_t*)(a) = (v))
#define writew(va, d) (*(volatile uint16_t *) (va) = (d))