[okl4-developer] Fwd: Adding a privileged mode functionality

[Jorge Torres]

---------- Forwarded message ----------
From: Jorge Torres <jorge.torres.maldonado at gmail.com>
Date: Oct 18, 2007 10:26 AM
Subject: Re: [okl4-developer] Adding a privileged mode functionality
To: "Martin P. Lawitzky" <martin.lawitzky at nicta.com.au>

Hi Martin,

What are those functions?, sigma does not exist eny more, the only
priviliged thread is the rootserver (iguana server), I don't see why if you
need a privileged thread not to add it, you can have a thread privileged if
you set its AS to be the root AS, this can be done by hacking the iguana
server and there you can create your privileged threads.

Cheers,

Jorge

On 10/18/07, Martin P. Lawitzky <martin.lawitzky at nicta.com.au> wrote:
>
> Hi,
>
> I need to add certain functions to L4 that require the privileged mode
> and can be invoked from user space. In particular, I need some
> co-processor functions.
>
> My first idea was adding syscalls for these purposes, but I found here:
> http://osdir.com/ml/micro-kernel.l4.l4ka.general/2006-11/msg00017.html
> that adding syscalls is not supposed.
>
> Another idea was adding privileged threads besides root and sigma to be
> called via IPC. But this also seems not to be the supposed way.
>
> So, my question is: What is the supposed way to make additional
> privileged-mode code accessible to user space?
>
> I'm new to L4 and would be happy about your advice.
>
>
> Thanks in advance,
>
> Martin
>
>
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