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Re: [patch] hp-timing for powerpc64


Paul Mackerras wrote:

> On reflection, I guess you are thinking of the RTC registers in the
> 601, which was different

No, I wasn't.


> All 64-bit PowerPC machines have a timebase register, which is a
> simple 64-bit binary counter which increments at a constant frequency
> and can be read with the mftb instruction.  So it should be OK to use
> it for the hp-timing facility for powerpc64.

Once the code gets the appropriate scaling (i.e., multiply by the factor
for the CPU) I have no problems.  Stuff the value into the vdso if
possible since the /proc reading is rather expensive (but necessary
unless the vdso has the value).

-- 
â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â

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