F_RO
MMIO_F(reg, 4, F_RO | f, 0, rm, d, r, w)
MMIO_RING_F(prefix, 4, F_RO | f, 0, rm, d, r, w)
MMIO_RING_F(RING_REG, 4, F_RO, 0,
MMIO_RING_F(RING_REG, 8, F_RO, 0, ~0, D_BDW_PLUS,
MMIO_RING_F(RING_REG, 48, F_RO, 0, ~0, D_BDW_PLUS, NULL, NULL);