linux-kernel - Re: [PATCH v2] PowerPC: kernel: compiling issue, make additional room in exception vector area

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Date:	Fri, 26 Apr 2013 11:42:48 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Mike Qiu <qiudayu@...ux.vnet.ibm.com>
CC:	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 11:25, 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 д��:
>>>>>> 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.

:-)

> Thank you for your information !
> 
> I have checked the disassemble by powerpc64-linux-gnu-objdump, it seems
> all we have done for 0x900 is almost like the original done for 0x200.
> 
> I am just learning about the CFAR (google it), And I plan to wait for a
> day, if all things go smoothly, I will send patch v3.
> 
> 
> :-)
> 


-- 
Chen Gang

Asianux Corporation
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