[sldev] Linux cpu frequency

[Dzonatas]

I just tested a little tidbit, and I was surprised it was accurate even 
on a virtualized Linux.

in CProcessor::GetCPUFrequency()

    struct timeval tv_start, tv_end;
    U64 start, end;
    F64 secs_start, secs_end;
   
    gettimeofday(&tv_start, NULL);
    start = get_cpu_clock_count();

    usleep(uiMeasureMSecs);

    gettimeofday(&tv_end, NULL);
    end = get_cpu_clock_count();

    secs_start      = (F64)tv_start.tv_usec / 1000000.0f + 
(F64)tv_start.tv_sec;
    secs_end        = (F64)tv_end.tv_usec / 1000000.0f + (F64)tv_end.tv_sec;

    return ( uqwFrequency = (F64)(end - start) / (secs_end - secs_start) 
/ 1000000 );

That'll work for a default method for any x86 Unix that supports 
usleep() and an accurate gettimeofday().

Now to test /proc and /sys before this is used...

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