AU_HIMEM_SPACE_IO
if (c->c_flags & AU_HIMEM_SPACE_IO)
0x00000000, 0xffffffff, AU_HIMEM_SPACE_IO);
AU_HIMEM_SPACE_LITTLE_ENDIAN | AU_HIMEM_SPACE_IO);
AU_HIMEM_SPACE_LITTLE_ENDIAN | AU_HIMEM_SPACE_IO);