Re: [Qemu-devel] [PATCH v9 00/10] 8bit AVR cores

[Michael Rolnik]

in the range [0x0000 - 0x0100)
some registers are owned by the CPU and some by board devices.
CPU registers will be accessed by helper_fullrd & helper_fullwr whereas
device registers e.g. USB, will be handled by USB provided it's possible to
add rd/wr handlers for specific io addresses.

On Wed, Jul 6, 2016 at 12:43 PM, Peter Maydell <address@hidden>
wrote:

> On 6 July 2016 at 10:36, Michael Rolnik <address@hidden> wrote:
> > Peter,
> >
> > I think I will do the following
> > 1. helper fullwr will modify CPU owned registers by itself and call
> cpu_outb
> > for non owned registers
> > 2. I will add helper fullrd that will behave like fullwr.
> > 3. any board/model will have to install a device in the io space for
> > registers not owned by the CPU.
> >
> > it will make sample_io.c device obsolete and make (future) devices more
> > independent.
> >
> > what do you think?
> > Could you please point me to an example how to create a device in the io
> > space?
>
> What does the device in the IO space need to do?
>
> thanks
> -- PMM
>



-- 
Best Regards,
Michael Rolnik