[kmiroslav]

It's easy to do this when you don't need to interact with the outside world and you don't even care about memory protection.

[kedean]

If by 'outside world' you mean legacy systems, then ok, that's valid, but there's not really any reason that idea couldn't be portable across systems, as long as they support common encodings. I fail to see how a ring-0 memory model factors in at all.