Re: [Qemu-devel] Timers

["andrzej zaborowski" <balrogg@gmail.com>]

On 23/05/07, Paul Brook <paul@codesourcery.com> wrote:
> On Wednesday 23 May 2007, Blue Swirl wrote:
> > On 5/23/07, Paul Brook <paul@codesourcery.com> wrote:
> > > On Wednesday 23 May 2007, Blue Swirl wrote:
> > > > On 5/23/07, Paul Brook <paul@codesourcery.com> wrote:
> > > > > I get fed up of having to re-implement a simple countdown timer for
> > > > > every new board, so I've added a simple periodic timer implementation
> > > > > to cvs (ptimer.c). Currently only the Arm PrimeCell based boards use
> > > > > this, but I've a few other uses in the pipeline.
> > > >
> > > > Nice idea! On Sparc the timer can be configured to work in 64-bit
> > > > mode, so could the ptimer_get/set_count be changed to use 64-bit
> > > > values?
> > I made the API change and converted Sparc timers. Looks like it works
> > (guest clock runs normally), though there are the following messages
> > on startup:
> > FIXME: ptimer_set_limit with running timer
> >
> > Comments? Did I break something?
>
> Code looks reasonable to me.  The FIXME means you're changing the timer
> parameters after starting the timer. I didn't check whether this does
> anything sensible (this may depend on the device), hence the message.
> It probably needs some attention when reload == 1 && s->enabled.
>
> Note that save/restore is not implemented.  You may wish to implement this

I was thinking that it should be possible to save/restore all vm_clock
based timers in qemu at QEMUTimer level so that hardware emulation
doesn't have to bother restoring this. (the "ptimer" would still need
to save its internal fields).

Regards,
Andrzej