[Xenomai-help] adeos & protection rings on ppc

[Xenomai-help] adeos & protection rings on ppc

[Syed Amer Gilani]

I am currently writing my Thesis about a Motor control running Linux
with Xenomai. In the Process of explaining Adeos i run into something
i don't understand. On an x86 CPU adeos runs on Ring 0 and pushes
Linux to Ring 1 to ensure it alone has access to certain things. User
Programs still run on Ring 3 as before. But the Hardware i use is
PowerPC based(mpc5200) and as far as i know on RISC Architectures
there are only 2 Protection domains, "system" and "user". How does
Adeos work here? Does it run together with Linux on the system domain
or does it push Linux in the user domain?
I hope someone can give me a short answer because documentation beside
the source code itself for the adeos ppc patch doesn't seem to exist.

Amer

Re: [Xenomai-help] adeos & protection rings on ppc

[Gilles Chanteperdrix]

Syed Amer Gilani wrote:
> (...) On an x86 CPU adeos runs on Ring 0 and pushes
> Linux to Ring 1 to ensure it alone has access to certain things (...)

No, even when running with Adeos on x86, Linux ring level is not changed.

-- 
                                                 Gilles Chanteperdrix