Need some Info regarding OpenJDK for MIPS.

[YANG Yongqiang]

Hi Kiran,

I think it will need not too much effort to do this job. The job could be
divided into 2 phases.

First, you can change template interperter back to big endian.
To do this, you need to implement your bytes operations, which are in 
hotspot/src/cpu/mips/vm/bytes_mips*.

Second, you can make c1 support MIPS with big endian. You need to
implement  native instructions which are in
hotspot/src/cpu/mips/vm/nativeInst_mips*.

During our porting, we had a premise that destination processor is little
endian.  Thus maybe there are some ugly codes which rely on the premise. 
This will need your some efforts to detect these codes.


Cheers,
Yongqiang.

> Hi Yang
>
> Thanks for the reply ,what is the effort needed to change it back
> to big endian.If you have any idea please let me know ,as I am intersted
> to change it back
> to bigendian as the Hadware we use is MIPS big endian.
>
>
> Thanks and Regards
> -------------------------------------
>
> Kiran Kumar P
> Mobile: 9880758736
>
> -----Original Message-----
> From: ext YANG Yongqiang [mailto:yangyongqiang at loongson.cn]
> Sent: Thursday, December 23, 2010 12:10 PM
> To: Kumar, Kiran 3. (NSN - IN/Bangalore)
> Cc: ext YANG Yongqiang; mips-port at openjdk.java.net
> Subject: RE: Need some Info regarding OpenJDK for MIPS.
>
>>
>> Hi  YANG
>>
>> Here I have one question as JAVA by defaullt is big endian ,correct me
>> if
>> I am wrong.
>> What I understood is it is ported to  little endian now I have to change
>> it back to use big endian right.
>
> Yes, you are right.
> BTW: The destination of this porting is Loongson processor which is little
> endian, so we must change big endian to little endian .
>
>>
>>
>>
>>
>> Thanks and Regards
>> -------------------------------------
>>
>> Kiran Kumar P
>> Mobile: 9880758736
>>
>> -----Original Message-----
>> From: ext YANG Yongqiang [mailto:yangyongqiang at loongson.cn]
>> Sent: Thursday, December 23, 2010 11:58 AM
>> To: Kumar, Kiran 3. (NSN - IN/Bangalore)
>> Cc: mips-port at openjdk.java.net
>> Subject: Re: Need some Info regarding OpenJDK for MIPS.
>>
>> Hi Kiran Kumar P,
>>
>> Now it only supports MIPS on little Endian architecture.  If you want a
>> version supporting MIPS on big Endian architecture.  You just need to
>> change native instructions and bytes instructions yourself.
>>
>> Cheers,
>> Yongqiang.
>>
>>>
>>> HI
>>>
>>> I am Kiran from Nokia Siemens Bangalore, I came across u r website
>>> http://icedtea.classpath.org/hg/openjdk6-mips/summary
>>> That I came to know that OpenJDK is available for MIPS ,we are also
>>> looking for java on MIPS.
>>>
>>> Here my question is this OpenJDK supports MIPS on big Endian
>>> architecure,as we are looking for OpenJDK on MIPS for big Endian.
>>> Thank you.
>>>
>>>
>>> Thanks and Regards
>>> -------------------------------------
>>>
>>> Kiran Kumar P
>>> Mobile: 9880758736
>>>
>>>
>>
>>
>> --
>> Yongqiang
>> $B!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(J
>>
>>
>
>
> --
> Yongqiang
> $B!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(J
>
>


-- 
Yongqiang
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