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Atari demoscene BBS
| Re: memory protection on st |
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Posted by: Peter
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Jun,24.2004-17:08
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It is done using hardware.
(Excuse me if I'm not 100% accurate here, but I think it is somewhat correct)
On each bus cycle, a few input pins on the CPU determine if the current access requires suprvisor or user mode, or if it should generate a bus error.
The address decoding circuits simply apply information on these.
It's a simple static flavour of memory protection.
-- Peter
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