Messages in this thread | | | Date | Mon, 06 Mar 2000 17:06:43 -0600 | From | "Thomas E. Dodd /CSDC" <> | Subject | Re: [OT] fpu IRQ x86-ism |
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nathan.zook@amd.com wrote: > > > -----Original Message----- > > From: hpa@transmeta.com [mailto:hpa@transmeta.com] > > By author: "B. James Phillippe" <bryan@terran.org> > > > > > > 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 > > It is in comaptibility mode. Which means we have to support it.
So is there a way to free that IRQ for something else on newer CPU like the K7 and P6? Does anything in the Linux world depend on it?
-Thomas
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