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SubjectRe: VGA PCI IO port reservations
Followup to:  <>
By author: Olivier Galibert <>
In newsgroup:
> What guarantees you that:
> 1- No device will respond 0xffff for an address it decodes
> 2- No device will crap up on you simply because you've read one
> particular address
> If any of these if true for any device out there (I think I have one
> in my computer that does the 1/ part in some cases), your code is
> unsafe.

It is. There are plenty of devices for which an arbitrary IN is an
irrecoverable state transition.

<> at work, <> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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