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

From: Alexander Graf
Subject: Re: [Qemu-ppc] [OpenBIOS] Running client with MMU off
Date: Thu, 26 Jun 2014 14:08:23 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

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?


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.


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