Messages in this thread |  | | From | "H. Peter Anvin" <> | Subject | Re: VGA PCI IO port reservations | Date | 17 Nov 2000 18:10:13 -0800 |
| |
Followup to: <20001117202009.B2472@zalem.puupuu.org> By author: Olivier Galibert <galibert@pobox.com> In newsgroup: linux.dev.kernel > > 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.
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |