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Path: utzoo!utgpu!water!watmath!clyde!rutgers!seismo!rochester!stuart
From: stuart@rochester.UUCP
Newsgroups: comp.arch
Subject: AM29000 memory management (was flame)
Message-ID: <27207@rochester.ARPA>
Date: Wed, 22-Apr-87 04:59:00 EST
Article-I.D.: rocheste.27207
Posted: Wed Apr 22 04:59:00 1987
Date-Received: Fri, 24-Apr-87 00:04:42 EST
References: <67@bernina.UUCP>
Distribution: world
Organization: U of Rochester, CS Dept., Rochester, NY
Lines: 12
Summary: translation lookaside buffer not equal to page tables

In article <67@bernina.UUCP>, tve@ethz.UUCP (Th. von Eicken) writes:
> When reading the data sheet I noticed that the TLB entries
> don not have any "page used" flag nor any "page modified"
> flag. Does that mean that the AM29000 memory managenent is even
> more crippled than on a VAX (which doesn't have a "page used" flag???

A translation lookaside buffer (TLB) is not the same as page tables (PT).
The TLB serves as a cache of recently used address translations, while
the PT serves as the source of translation information.  Reference
(page used) and dirty (page modified) flags belong in the PT.

Stu Friedberg  {seismo, allegra}!rochester!stuart  stuart@cs.rochester.edu