Riley Williams wrote:
>
> Hi Peter.
>
> >> Sorry for this somewhat OT question - I'll try to be brief.
> >> I have always noticed that on x86 Linux boxes, IRQ 13 is
> >> for the FPU and is always "1" (I assume this is from
> >> probing or testing at bootup). This value never seems to
> >> change, so again I will assume that it is only used to
> >> signal FPU errors. There is no "fpu IRQ" on my Alpha,
> >> obviously it has an FPU as well. Is it's existance on the
> >> PC just some lame legacy issue?
>
> > Yup. It isn't even used to signal FPU errors on 486+ PCs.
>
> Does that mean it's available for use by other hardware, or is
> that prohibited by other considerations?
>
It's not -- there is no wire that can be used to raise IRQ 13 from any
other device.
-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Tue Mar 07 2000 - 21:00:21 EST