That is indeed the case, but since the 601 and 603 don't don't search the
htab for you but rather trap to the os there's no need to even use it! It
would be quite possible (and I've been thinking about it lately) to just
have the 60{1,3} search the linux maintained tree instead, load tlb
entries from there and only convert this tree to the ppc htab for the 604
which does the search for you.
}I'm not a PPC MMU expert, but AFAIK in Linux/PPC the `Intel style' MMU tree is
}converted on the fly to a PPC MMU tree.