_PAGE_PRESENT and _PAGE_ACCESSED

[LEROY Christophe]

In ppc8xx tlbmiss handler, we consider a page valid if both  
_PAGE_PRESENT and _PAGE_ACCESSED are set.
Is there any chance to have _PAGE_ACCESSED set and not _PAGE_PRESENT ?
Otherwise we could simplify the handler by considering the page valid  
only when _PAGE_ACCESSED is set

Christophe
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