RE: a working ppc emulator

Any kind of a low level project like this is a great idea.  My interest is
in porting a powerpc compiler from the Mac or some such platform to the
as400.  Compiling and running a powerpc assembler program on the 400 would
be fantastic. We had a discussion on this list a long time ago on how the
powerpc long jump can branch the program execution to any 64 bit address.
Which on the 400 means you can jump to code that resides in an external
object like a user space. That sort of facility looks to me to be the
foundation of how you would extend the object model of the system.

Matt, as far as what you are proposing, are you suggesting running as400
powerpc byte code on a PC?  I am interested just to know how to do it.  How
would you get the object code off of the as400 onto the pc?

-Steve

-----Original Message-----
From: mi400-bounces@xxxxxxxxxxxx [mailto:mi400-bounces@xxxxxxxxxxxx]On
Behalf Of Matthew D. Frederes
Sent: Saturday, June 26, 2004 6:50 PM
To: mi400@xxxxxxxxxxxx
Subject: [MI400] a working ppc emulator


There is a functional, open source PowerPC emulator for the x86 on the
internet called PearPC, www.pearpc.net <http://www.pearpc.net/> .  I believe
it emulates the PowerPC 750 chip.  It will run PPC Linux and Mac OS X, and
was designed to run a wide variety of PowerPC based operating systems.  I
have witnessed OS X running on a P4, and it was quite amazing.



I realize the PowerPC chip being emulated here is not exactly the same as
used in the iSeries, and that the iSeries chips have extended instructions
with undocumented IOPs, as pointed out in earlier posts.  Nevertheless, I
can not help but wonder what changes would need to be made to this emulator
to be able to IPL the SLIC.  It would be a lot of fun to see it work.



It could be that there is insufficient documentation available for the
peripherals to actually accomplish a working emulator.  Still, I'm curious
if anyone is interested in discussing this topic, or actually starting such
a project, using a base of code such as PearPC as a starting point.



Matt





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