Zdenek Kabelac wrote:
>
> I don't understand this - you mean when CPU executes CLI/STI its being catch
> by some trap ???? - I could imagine that Linux kernel runs on
> different level of protection (i386 has four of them if I remember this
> correctly), but this exception handling takes quite a lot of CPU cycles.
>
> Is there any explanation/article I could learn more about this "magic" ??
> (Basicaly how RTAI could hold with timelimit if the linux-driver calls CLI
> and wait in busy-loop for 1ms)
>
> (I still suppose there are no internal kernel modifications and I could
> use RT just with module insert of RTAI modules)
>
OK, here's were we lost each other. Both RTL and RTAI have to patch
the kernel. It is RTAI's patch of the kernel that inserts the hooks.
Once the hooks are inserted, you can get RT by inserting the RTAI
modules. Check out www.rtai.org for further info on this.
Best regards.
Karim
===================================================
Karim Yaghmour
[EMAIL PROTECTED]
Operating System Consultant
(Linux kernel, real-time and distributed systems)
===================================================
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