[PATCH] hp-timing for ppc32/64

[Benjamin Herrenschmidt]

> On x86 they only implement hp-timing on i686 and newer based on the "Time 
> Stamp Counter" and the "read time-stamp counter" instruction. Since they 
> only have one "kind" of timebase they don't need to access dl_hwcap in 
> hp-timing. This is also true for alpha, ia64, sparc, X86_64 and powerpc64. 
> It would be true for ppc32 except for the 601 and 403 chips ...

How do they know that they are running on i686 ?

> The whole idea of hp-timing is that is fast, simple, and inline code. It 
> is not a general purpose clock. It must also work in the restricted 
> environment of the dynamic loader itself, like before and the durring the 
> time the loader is relocating its self!

AT_HWCAP is available at all time since it's passed by the kernel

Ben.