linux-kernel - Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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Message-Id: <f9afbdb49bc1f935153305315770bccd@kernel.crashing.org>
Date:	Thu, 17 May 2007 21:27:17 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linuxppc-dev@...abs.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

> +	 * We must write a positive value to the decrementer to clear
> +	 * the interrupt on the IBM 970 CPU series.  In periodic mode,
> +	 * this happens when the decrementer gets reloaded later, but
> +	 * in one-shot mode, we have to do it here since an event handler
> +	 * may skip loading the new value...

Nothing special about 970 here -- on *every* PowerPC,
a decrementer exception exists as long as the high
bit of the decrementer equals 1.  BookE is different
of course.  Some other CPUs might deviate from the
architecture as well.


Segher

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