| From: | Allan Odgaard |
| Date: | 13 Jun 2000 at 22:40:16 |
| Subject: | Re: Off topic, and libraries :) and asm |
On 13-Jun-00, Johan Rasten wrote:
>>> But if the VP is parsing all the commands wouldn't it be very easy to
>>> check if the memwrite is legal? [...]
> [...] (as commands are parsed by the vp) it wouldn't take too
> many extra cycles to check if the adress to be written to is also legal..
Well, the VP interpretor doesn't have the required info to know where the task
is allowed to write. If it had, it'd be exactly as if the OS supported MP
except that the processor/MMU can do it without overhead (the VP would use
*many* cycles to look up the address in a table). Also, it still disallows
virtual memory.
Regards Allan
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