RING_BBADDR
bbaddr = ENGINE_READ64(engine, RING_BBADDR, RING_BBADDR_UDW);
bbaddr = ENGINE_READ(engine, RING_BBADDR);
{ RING_BBADDR(0), 0, 0, "RING_BBADDR_LOW32" }, \
MMIO_RING_GM(RING_BBADDR, D_ALL, NULL, NULL);
ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
MMIO_RING_D(RING_BBADDR);
{ RING_BBADDR(0), REG_64BIT_LOW_DW, 0, 0, 0, NULL}, \