Subject:
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Re: mmu
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 11 Aug 1998 23:32:03 GMT
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Original-From:
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Chuck McManis <cmcmanis@freegate.com&ihatespam&>
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Viewed:
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1238 times
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It's not impossible. The easiest way is to use the same technique as
Java (or IC) and write an embedded interpreter that executes code for a
"psuedo" machine. The resulting machine can have arbitrarily strict
access restrictions between tasks. You do have to take away some C
"features" like casting an arbitrary value to a pointer, etc, but you
can do it.
I'm curious how the "users" of your system would be motivated to crash
it. If you're simply looking for a "safe" development environment
consider a version of BASIC without poke...
--Chuck
Richard meester wrote:
>
> Hello all,
>
> i'm trying to write a small OS, but am confused about something.
>
> I don't want to give access to all memory locations for the user, only
> for the supervisor.
> Since the 68hc11 doens't have these modes i have to think of something
> else. A sollution is a external mmu, but this maybe some overkill.
>
> Does anyone have some suggestions, or is it simply impossible to do.
>
> Regards
> Richard Meester
> Software Engineer
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Message is in Reply To:
 | | mmu
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| Hello all, i'm trying to write a small OS, but am confused about something. I don't want to give access to all memory locations for the user, only for the supervisor. Since the 68hc11 doens't have these modes i have to think of something else. A (...) (26 years ago, 11-Aug-98, to lugnet.robotics.handyboard)
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