IO_READ_1
IO_READ_1(sc, PORT_PKTPG_PTR + 0);
IO_READ_1(sc, PORT_PKTPG_PTR + 1);
IO_READ_1(sc, PORT_PKTPG_PTR + 0);
IO_READ_1(sc, PORT_PKTPG_PTR + 1);
result = (IO_READ_1(sc, off) & 0xff);
result |= ((IO_READ_1(sc, off+1) & 0xff) << 8);