SELF_ID_ZERO_SCODE_MASK
return (quadlet & SELF_ID_ZERO_SCODE_MASK) >> SELF_ID_ZERO_SCODE_SHIFT;
*quadlet &= ~SELF_ID_ZERO_SCODE_MASK;
*quadlet |= (speed << SELF_ID_ZERO_SCODE_SHIFT) & SELF_ID_ZERO_SCODE_MASK;
((((const u32 *)quads)[0] & SELF_ID_ZERO_SCODE_MASK) >> SELF_ID_ZERO_SCODE_SHIFT)