Re: [uml-user] tsc.c in UML

[Han <kee...@gm...>]

On Tue, Aug 27, 2013 at 1:31 PM, Richard Weinberger <ri...@no...> wrote:

> Hi!
>
> Am 27.08.2013 19:51, schrieb Han:
> >
> > On Sat, Aug 24, 2013 at 6:42 AM, richard -rw- weinberger <
> ric...@gm... <mailto:ric...@gm...>> wrote:
> >
> >     On Fri, Aug 23, 2013 at 8:35 PM, Han <kee...@gm... <mailto:
> kee...@gm...>> wrote:
> >     > Hi,
> >     >
> >     > I am using Linux kernel 2.6.27 for building UML kernel.  It seems
> like
> >     > "arch/x86/kernel/tsc.c" is not built in and the symbol "cpu_khz"
> is not
> >     > available.
> >     >
> >     > My question is:  what's the reason that "tsc.c" not included in
> UML?  Is
> >     > there any config or simple way(patch?)  to include it in UML?
> >
> >     Simply because UML has no TSC.
> >
> >
> >
> > [Han]  I don't really understand why UML has no TSC.   As I know,  TSC
> is accessible from user space process (on x86 at least) and I don't see any
> obvious reason why UML does not
> > support TSC.   I might missed something.
>
> What exactly is the problem you are trying to solve?
>
> > I am trying to add TSC into UML kernel (2.6.27)  for an experiment.   Is
> that a practical thing to do at all?
>
> What exactly do you want to add? TSC as a clocksource to UML..?
>

my immediate need is to compile and run an application that uses "cpu_khz"
 (which is part of tsc.c).  I cannot modify the source code of the
application as I am not the owner.

thanks.
Han

>
> Thanks,
> //richard
>
>