On 6 September 2011 14:38, Mans Rullgard <mans.rullg...@linaro.org> wrote:

> I have an old kernel patch somewhere that allows userspace to read the
> ID register
> by emulating the relevant MRC in the illegal instruction trap handler.  
> Perhaps
> this is something worth reviving.  With this approach, interpreting the ID 
> value
> would still be left as an exercise for the application.

Would it be better for the kernel just to pass it in the AUXV somewhere?
It's fine for the user space to interpret it - I'm thinking of ifunc
to be able to decide
based on a libraries idea that it knows what's better for a particular core.

Dave

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