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

[Richard W. <ri...@no...>]

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..?

Thanks,
//richard