Re: [Qemu-ppc] [OpenBIOS] Running client with MMU off

[Alexander Graf]

On 26.06.14 14:03, BALATON Zoltan wrote:
> On Thu, 26 Jun 2014, Alexander Graf wrote:
> > > > I don't think any other OS really accesses these ranges, but only 
> > > > time will tell ;).
> > >
> > > Don't know, according to previous replies they may. Then how about 
> > > always clearing the translation for page zero the next time our 
> > > handler is called so I always get a new exception when it's 
> > > accessed? (I have to add it for the access to succeed but I may 
> > > remove it at the next possible occasion.) In the lack of a better 
> > > idea I'll try this.
> >
> > That sounds odd. Why don't you just implement a tiny instruction 
> > emulator? We only need to catch stores here, no?
>
> I assume yes but I'm not sure and I don't know how to do that. Do you 
> know about an example somewhere?

http://www.mail-archive.com/address@hidden/msg104190.html

vaddr_accessed is really just DAR at the time of the interrupt. I think 
you can reuse pretty much all of that code and remove everything related 
to load instructions.


Alex