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From: Philippe Gerum <rpm@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: Xenomai-core@domain.hid
Subject: Re: [Xenomai-core] [PATCH] fix __ipipe_tick_irq tracking across APIC reprogramming
Date: Wed, 26 Dec 2007 19:33:32 +0100	[thread overview]
Message-ID: <47729E7C.1050909@domain.hid> (raw)
In-Reply-To: <477275F1.6020708@domain.hid>

Jan Kiszka wrote:
> As LOCAL_TIMER_VECTOR != RTHAL_APIC_TIMER_VECTOR (Philippe, what was the
> motivation for this?),

In some cases, it's much saner to have two separate timer hw interrupt
sources, so that we may trigger a timer tick targeted at the Linux
kernel only from whatever domain, while grabbing the real-time timer
interrupt within the Xenomai domain, without getting any "boomerang"
effect. This is why we grab IPI3 and propagate to the local timer vector.

 we need to update __ipipe_tick_irq when we
> reprogram the APIC. Otherwise, I-pipe will not be able to capture and
> forward the related IRQ registers.
> 
> At this chance, refactor some references to Xenomai's own APIC timer IRQ.
> 
> Merry Christmas and all the best for 2008 to everyone!
> 

Thanks, best wishes for 2008 too.

> Jan
> 


-- 
Philippe.


      reply	other threads:[~2007-12-26 18:33 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-26 15:40 [Xenomai-core] [PATCH] fix __ipipe_tick_irq tracking across APIC reprogramming Jan Kiszka
2007-12-26 18:33 ` Philippe Gerum [this message]

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