> > but you'd need a huge bitmap for 64k ports for many (not too recent) cards
> > because of the great sparse IBM 8514A register layout:(
>
> 8192 bytes, and it can be solved that only _that_ process has such a large
> bitmap.
ah, glad to read that.
> > and in/out instructions take quite a few more cycles for every bitmap access.
>
> 3 cycles instead of 1 (if that cacheline is cached), is that really such a
> big problem?
in my 486 databook it's 10 vs. 30 cycles. is P5 that different?
> > and this all won't protect your system from graphics chips going cracy and
> > locking up e.g. the PCI bus due to bad values in correct registers
> > (not an uncommon problem at least for S3 chip;)
>
> yep but it will probably prevent a few hundred 'guest roots' ;)
haven't seen them yet, they seem to hide themself pretty well ;-)
Harald
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koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
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