[okl4-developer] Adding a privileged mode functionality

[Martin P. Lawitzky]

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