Article View: comp.sys.amiga.tech
Article #13039Re: MEMF_PHYSICAL?
From: Kristoffer Eriksson
Date: Thu, 08 Jun 1989 18:25
Date: Thu, 08 Jun 1989 18:25
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1571 bytes
In article <8906030123.AA14671@jade.berkeley.edu> 451061@UOTTAWA.BITNET (Valentin Pepelea) writes:
>Valentin's AmigaOS 2.0:
>
>1. Single addressing space.
>2. Virtual memory.
>3. Memory protection.
-----------------
>4. Resource tracking.
>His error is pretty easy to catch if you though out how virtual memory is to
>be implemented. You see, the virtual memory handler on a single address space
>OS does not care what program is running in what memory. It merely swaps in and
-----------------------------------------------
>out individual pages one-by-one. Full programs never have to be swapped out
>entirely, just individual pages. This will become more obvious in a couple of
>weeks. :-)
How can the OS and MMU provide any protection, if they don't care what program
is using what memory?
--
Kristoffer Eriksson, Peridot Konsult AB, Hagagatan 6, S-703 40 Oerebro, Sweden
Phone: +46 19-13 03 60 ! e-mail: ske@pkmab.se
Fax: +46 19-11 51 03 ! or ...!{uunet,mcvax}!sunic.sunet.se!kullmar!pkmab!ske
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!mcvax!kth!sunic!kullmar!pkmab!skeReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!mcvax!kth!sunic!kullmar!pkmab!ske From: ske@pkmab.se (Kristoffer Eriksson) Newsgroups: comp.sys.amiga.tech Subject: Re: MEMF_PHYSICAL? Summary: How does the protection work? Message-ID: <1251@pkmab.se> Date: 8 Jun 89 18:25:20 GMT References: <8906030123.AA14671@jade.berkeley.edu> Reply-To: ske@pkmab.UUCP (Kristoffer Eriksson) Organization: Peridot Konsult i Mellansverige AB, Oerebro, Sweden Lines: 28