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List: linuxppc-embedded
Subject: Re: [PATCH] powerpc: Fix xmon for systems without MSR[RI]
From: Jimi Xenidis <jimix () pobox ! com>
Date: 2011-08-31 21:08:48
Message-ID: 372EB5CE-5331-4B30-973F-87005D4402CF () pobox ! com
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On Aug 30, 2011, at 1:08 PM, Scott Wood wrote:
> On 08/30/2011 01:11 AM, Benjamin Herrenschmidt wrote:
>> On Mon, 2011-08-08 at 16:25 -0500, Jimi Xenidis wrote:
>>> From: David Gibson <dwg@au1.ibm.com>
>>>
>>> Based on patch by David Gibson <dwg@au1.ibm.com>
>>>
>>> xmon has a longstanding bug on systems which are SMP-capable but lack
>>> the MSR[RI] bit. In these cases, xmon invoked by IPI on secondary
>>> CPUs will not properly keep quiet, but will print stuff, thereby
>>> garbling the primary xmon's output. This patch fixes it, by ignoring
>>> the RI bit if the processor does not support it.
>>>
>>> There's already a version of this for 4xx upstream, which we'll need
>>> to extend to other RI-lacking CPUs at some point. For now this adds
>>> BookE processors to the mix.
>>
>> Don't freescale one have RI ?
>
> e500mc does.
hmm, according to the ISA, MSR[RI] is only defined for Book3s and is not defined for Book3e
Should we scope it to just book3e?
-jx
>
> e500v2 doesn't -- if a machine check happens while MSR[ME]=0, it causes
> a checkstop.
>
> -Scott
>
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