JDK GNU/Linux SPARC and MIPS
springer at reservoir.com
Tue Sep 4 10:01:41 PDT 2007
Sunil Amitkumar Janki wrote:
> Christian Thalinger wrote:
>> On Wed, 2007-08-22 at 14:56 +0200, Sunil Amitkumar Janki wrote:
>>> I have GNU/Linux running on x86, MIPS and SPARC but only
>>> x86 has an up to date JDK. For MIPS I have JDK 1.5.0 and
>>> for SPARC Blackdown's JDK 1.4.1.
>>> I would like to see support for both architectures integrated
>>> into the JDK sources alongside x86, x86_64 and Solaris SPARC
>>> so all systems can benefit from up to date Java installations.
>>> Could someone point out to me what I'd have to do to get
>>> the latest JDK up and running and support for it integrated
>>> into mainline sources?
>> Well, you could port HotSpot or join us, in whatever way, in the IcedTea
>> project where we try to get OpenJDK running on non-HotSpot platforms.
>> - twisti
> I think it's a better use of my time to get OpenJDK running on
> MIPS and SPARC than porting an older HotSpot JVM. I hope
> there are provisions for other architectures in the build system
> or at least that it's flexible enough to accommodate for those.
> What parts of IcedTea would have to be ported or rewritten in
> order to support MIPS and SPARC? I will checkout from the
> repository and see what the IcedTea source code looks like later
The biggest part of porting is the core Hotspot virtual machine itself. The amount of
code that needs to be rewritten to port that to a new platform depends on whether either
or both of OS or hardware are new. OpenJDK is well-organized in that it separates out the
platform-dependent code into separate directories. There are three categories of
platform-dependent directory: os, cpu, and os_cpu.
The easiest of your ports would be Linux-SPARC, since there are already directories
os=linux and cpu=sparc, so you would just have to write the code in os_cpu=linux_sparc.
This is probably about 2500 LOC. Ports to a new os are harder, requiring about 10k LOC
(could be more if the OS is especially primitive). Ports to a new cpu are the hardest,
requiring from maybe 25k to 45k LOC, depending on the route you choose and whether you do
all the parts.
(Redirected from distro-pkg-dev since this isn't really a distro discussion.)
Jonathan Springer |
Reservoir Labs, Inc. | http://www.reservoir.com/
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