Re: how to get cpu_khz?

[Richard B. Johnson]

On Mon, 17 Sep 2001, David Fries wrote:

> On Mon, Sep 17, 2001 at 03:11:26PM -0400, John Weber wrote:
> > David Fries wrote:
> > > 
> > > I'm using the TSC of the Pentium processors to get some precise timing
> > > delays for writing to a eeprom (bit banging bus operations), and it
> > > works just fine, but the cpu_khz variable isn't exported to a kernel
> > > module, so I hardcoded in my module.  It works fine for that one
> > > system, but obviously I don't want to hard code it for the general
> > > case.  I guess I could write my own routine to figure out what the
> > > cpu_khz is, but it is already done, so how do I get access to it?
> > 
> > I don't know of any official way of doing this, but here's some 
> > code (written by aa) that accomplishes this.
> 
> For a user space program you could just read /proc/cpuinfo, I'm
> actually writing a kernel driver, maybe I wasn't clear enough.  I'm
> just frustrated because the variable I'm after, cpu_khz is already
> calculated at boot time (that's where /proc/cpuinfo gets its data) and
> that variable doesn't appear to be exported to the rest of the kernel,
> either that or I'm just missing something, which I would rather be the
> case at this point.
> 

Ask Alan to export it by default. If no-go, export it in your
configuration.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).

    I was going to compile a list of innovations that could be
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