On Thu, 7 Dec 2000, Andi Kleen wrote:
> Interesting. One of my ports references for PCs lists
>
> 0044 r/w PIT counter 3 (PS/2, EISA)
> used as fail-safe timer. generates an NMI on time out.
> for user generated NMI see at 0462.
Oh no, we don't use that. Even though we could, it's rare -- it exists
for EISA systems only and then mostly older ones (i.e. non-PCI ones).
In fact the only chipset that provides these additional NMI sources I
have docs for is the i82350 one.
> I don't know if modern PCs still provide this counter, but if yes it could
> be used for a slow NMI watchdog that only runs every 30s or so.
An ability to choose a NMI frequency, especially such a low one, would be
desirable but it is really inexistent for most IA32 systems.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +- 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/
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