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  1. Path: sparky!uunet!know!mips2!news.bbn.com!usc!zaphod.mps.ohio-state.edu!darwin.sura.net!europa.asd.contel.com!emory!swrinde!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!ira.uka.de!math.fu-berlin.de!uni-paderborn.de!uni-paderborn.de!usenet
  2. From: tron@uni-paderborn.de (Matthias Scheler)
  3. Newsgroups: comp.sys.amiga.programmer
  4. Subject: Re: physical memory protection with MMU
  5. Keywords: mmu, memory, task
  6. Message-ID: <nn.geht.nicht.die-zweite.121192@uni-paderborn.de>
  7. Date: 13 Nov 92 00:49:40 GMT
  8. References: <1992Oct26.162400@uni-paderborn.de> <heinz.04a3@edohwg.adsp.sub.org> <1992Nov10.154421.18725@cbis.ece.drexel.edu> <1dtp0rINN9jk@uni-paderborn.de> <1du485INNdbn@uni-paderborn.de>
  9. Organization: Uni Paderborn FB 17 Informatik GERMANY
  10. Lines: 27
  11. NNTP-Posting-Host: corinth-bb.uni-paderborn.de
  12.  
  13. chandler@uni-paderborn.de (Martin Grote) writes:
  14.  
  15. [stuff deleted]
  16.  
  17. >However, to focus on my original intention again:
  18. >- is it impossible / too difficult?
  19.  
  20. Too difficult, you can't build MMU tables for every 8 bytes of allocated
  21. memory. If you really would know how a MMU works and how Operating Systems
  22. with "Memory Protection" work you would know that it is impossible to put
  23. this in AmigaDOS without loosing 99.9% of the software. It's easy to
  24. scream for memory protection if you never wrote a program and don't know
  25. the concept of AmigaOS.
  26.  
  27. >- any disadvantages (does it have slow down the system)?
  28.  
  29. A little bit, and you would loose 99% of the software.
  30. Didn't I say that already :-) ?
  31.  
  32. >- if not, how about implementing it?
  33.  
  34. Do it, if it's so easy.
  35.  
  36. --
  37. Matthias Scheler                                         tron@uni-paderborn.de
  38. University of Paderborn (Germany)
  39. ,
  40.