Florin Malita wrote:
On Thu, 22 Sep 2005 11:19:37 -0300
sauro <sauro@xxxxxxxxxxx> wrote:
I am actually working on an MPC5200 (Freescale PowerPC) with Denx
embedded linux distribution, and there is no rdtsc avaiable... :(
And we are getting problems with gettimeofday, because of timer
desynchronization with the time server... and jiffies can't get the
desired precision in our application.
So that's why I am trying to use get_cycles. Was it a bad idea?
It's just not worth the trouble. What I'm suggesting is just copy
get_cycles() from your architecture-specific implementation in your
application. I assume it's not based on any kernel-specific mechanism
as most architectures have dedicated registers for this kind of stuff.
Just pick your architecture from the list and dig into the get_cycles()
code: http://lxr.linux.no/ident?i=get_cycles
It's probably this one?
http://lxr.linux.no/source/include/asm-ppc/timex.h#L24
Florin
It worked just perfect! Thank you very much! :)
You are right, the inline code has no depencies upon any kernel stuff,
so it was just a matter of putting some assembly into my C app, no prob
at all.
(the code was that one you pointed out, I had just found it on my kernel
tree by the same time)
Sauro
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