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Re: [Qemu-devel] [Qemu-ppc] [RESEND][PATCH] booke timers

From: Scott Wood
Subject: Re: [Qemu-devel] [Qemu-ppc] [RESEND][PATCH] booke timers
Date: Mon, 12 Sep 2011 12:23:36 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110428 Fedora/3.1.10-1.fc15 Thunderbird/3.1.10

On 09/09/2011 09:58 AM, Alexander Graf wrote:
> On 09.09.2011, at 16:22, Fabien Chouteau wrote:
>> if the interrupt is already set and you clear TCR.DIE, the interrupt has to
>> remain set. The only way to unset an interrupt is to clear the corresponding
>> bit in TSR (currently in store_booke_tsr).
> Are you sure? I see several things in the 2.06 spec:
> To me that sounds as if the decrementer interrupt gets injected only
> when TSR.DIS=1, TCR.DIE=1 and MSR.EE=1. Unsetting any of these bits
> stops the interrupt from being delivered.
> Scott, can you please check up with the hardware guys if this is correct?

This is how I've always understood it to work (assuming the interrupt
hasn't already been delivered, of course).  Fabien, do you have real
hardware that you see behave the way you describe?


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