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Eric,

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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.  

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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.

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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