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Message-ID: <517B9A4D.1020502@gmail.com>
Date: Sat, 27 Apr 2013 17:28:45 +0800
From: Chen Gang F T <chen.gang.flying.transformer@...il.com>
To: Mike Qiu <qiudayu@...ux.vnet.ibm.com>
CC: Chen Gang <gang.chen@...anux.com>,
Michael Neuling <mikey@...ling.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <michael@...erman.id.au>,
linuxppc-dev@...ts.ozlabs.org, sfr@...b.auug.org.au,
matt@...abs.org, linux-kernel@...r.kernel.org,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional
room in exception vector area
On 2013年04月26日 11:54, Mike Qiu wrote:
> 于 2013/4/26 11:42, Chen Gang 写道:
>> On 2013年04月26日 11:25, Chen Gang wrote:
>>> On 2013年04月26日 11:08, Mike Qiu wrote:
>>>> 于 2013/4/26 10:06, Chen Gang 写道:
>>>>> On 2013年04月26日 10:03, Mike Qiu wrote:
>>>>>> �� 2013/4/26 9:36, Chen Gang �:
>>>>>>>> On 2013��04��26�� 09:18, Chen Gang wrote:
>>>>>>>>>> On 2013��04��26�� 09:06, Chen Gang wrote:
>>>>>>>>>>>>>> CFAR is the Come From Register. It saves the location of the
>>>>>>>>>>>>>> last
>>>>>>>>>>>>>>>> branch and is hence overwritten by any branch.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>> Do we process it just like others done (e.g. 0x300, 0xe00,
>>>>>>>>>>>> 0xe20 ...) ?
>>>>>>>>>>>> . = 0x900
>>>>>>>>>>>> .globl decrementer_pSeries
>>>>>>>>>>>> decrementer_pSeries:
>>>>>>>>>>>> HMT_MEDIUM_PPR_DISCARD
>>>>>>>>>>>> SET_SCRATCH0(r13)
>>>>>>>>>>>> b decrementer_pSeries_0
>>>>>>>>>>>>
>>>>>>>>>>>> ...
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>> Oh, it seems EXCEPTION_PROLOG_1 will save the regesters which
>>>>>>>> related
>>>>>>>> with CFAR, so I think need move EXCEPTION_PROLOG_1 to near 0x900.
>>>>>> I will try your diff V2, to see if the machine can boot up
>>>>> OK, thanks. (hope it can work)
>>>> It seems that the machine can be bootup in powernv mode, but I'm not
>>>> sure if my machine call that module.
>>>>
>>>> At lease my machine can boot up
>> Please reference commit number: 1707dd161349e6c54170c88d94fed012e3d224e3
>> (1707dd1 powerpc: Save CFAR before branching in interrupt entry paths)
>>
>> What our diff v2 has done is just the fix for our patch v2 (just like
>> the commit 1707dd1 has done).
>>
>> Please check, thanks.
>>
>> :-)
> I will check this evening or tomorrow, I have something else to do this
> afteroon.
I think the diff v2 is correct, but is not the best one for this issue.
I prefer the Paul's patch for this issue which has better performance
:-)
Thanks.
--
Chen Gang
Flying Transformer
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