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SubjectRe: [OT] fpu IRQ x86-ism
Date
Followup to:  <Pine.LNX.4.10.10003061109520.12766-100000@neptune.terran>
By author: "B. James Phillippe" <bryan@terran.org>
In newsgroup: linux.dev.kernel
>
> Greetings,
>
> 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.

-hpa

--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."

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