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Date: Tue, 10 Jul 2012 19:00:16 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] XDDP and inter-driver API.
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To: Lennart Sorensen <lsorense@csclub.uwaterloo.ca>
Cc: xenomai@xenomai.org

On 07/10/2012 06:24 PM, Lennart Sorensen wrote:
> On Tue, Jul 10, 2012 at 12:15:24PM -0400, Sunetra Sashi wrote:
>> Thanks for clarifying. I should have said ¨not possible using Xenomai
>> IPCs¨. Sorry about that.
>>
>> I am not trying to port legacy code. I am instead trying to establish a
>> communication pathway from voice applications in user land to some real
>> time xenomai code running within the kernel via a linux driver KM running
>> native linux. In our instance, it is necessary that the code executes in
>> the kernel space.
>
> Nothing is ever necesary.  Sometimes it may be easier.
>
>> On a related note, if I create a simple xenomai kernel module running real
>> time code and signal events to it from linux kernel space (via the rt_event
>> API) and communicate information back via interrupts (assuming we manage
>> memory via shared buffers), would that considered to be a true
>> Linux-Xenomai switch?
>
> My understanding was that xenomai 3.x won't even allow kernel mode
> realtime anymore, only userspace, so unless you have no intension of
> ever going to future versions, you probably don't want to design your
> code that way.
>
> I must admit I haven't checked the details of that to see how device
> drivers for xenomai are supposed to be handled in 3.x.
>

Xenomai will allow real-time mode in kernel space, but only over RTDM tasks.

-- 
Philippe.