linux-kernel - Re: [PATCH 3/7] [RFC] add support for BlueGene/P FPU

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Date:	Fri, 20 May 2011 10:43:40 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	Eric Van Hensbergen <ericvh@...il.com>
cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	bg-linux@...ts.anl-external.org
Subject: Re: [PATCH 3/7] [RFC] add support for BlueGene/P FPU

> >> >> > Eric,
> >> >> >
> >> >> >> This patch adds save/restore register support for the BlueGene/P
> >> >> >> double hummer FPU.
> >> >> >
> >> >> > What does this mean? =3DA0Needs more details here.
> >> >> >
> >>
> >> okay, I've changed it a bit in [V2], if you want more I can do my best.
> >
> > If you can describe the whole primary and secondary registers that'd be
> > cool. =A0ASCII art would be awesome! :-)
> >
> 
> You sure you don't just want a bitfield.conf? :)  

hehe, maybe an interpretive dance video posted on youtube?

> I'll do my best, but my ASCII art isn't what it used to be.  I'll also
> include a reference to the PDF.

Something self contained in the comments would be great as external
links tend to disappear.  

> >> > Ok, sounds like there is 32*8*2 bytes of data, rather than the normal
> >> > 32*8 bytes for FP only (ignoring VSX). If this is the case, then you'll
> >> > need make 'fpr' in the thread struct bigger which you can do by setting
> >> > TS_FPRWIDTH = 2 like we do for VSX.
> >> >
> 
> Okay - so basically what I have now and TS_FPRWIDTH=2 ?

Yes.

> >>
> >> Since it isn't available on other chips, shoudl it just be PPC_BGP_FPU
> >> or PPC_BGP_DOUBLE_FPU?
> >
> > I'd probably still prefer it disassociated with the CPU name, but we are
> > really bike shedding here. =A0I'm not too fussed.
> >
> 
> I'll leave it separate and switch it to PPC_FP2 (or would you prefer
> PPC_FP2_FPU to make it clear) since the public PDF refers to it this
> way.

PPC_FPU_FP2 would be my vote.

> If that all sounds good, I'll spin [V3] tomorrow.

Thanks!

Mikey
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