Subject: Re: FDDI
To: One Without Reason <email@example.com>
From: David Edelsohn <firstname.lastname@example.org>
Date: 10/16/2001 15:24:19
>>>>> One Without Reason writes:
Sridhar> Sort of. It supports the S/390 G4 and higher. Doesn't support the S/390
Sridhar> G1, the ES/9000, or others. Basically what I am doing is to move all the
Sridhar> code for the S/390-Ri4+ instruction set onto its own compiler flag.
Sridhar> Finding exactly where all these instructions are is taking time. It'll
Sridhar> take me another month or so. When I am done, though, I will be able to
Sridhar> get the NetBSD kernel working on any IBM mainframe newer than the ES/9000
Sridhar> 9021, and maybe even older systems than that.
I assume that you are aware of the S/390 "Principles of Operation"
documentation available on IBM websites as HTML, PDF, and BookMgr format:
Documentation for all generations of the S/390 architecture are
online for comparison, including details of changes in the introduction of
I believe that one of the dependencies on G4 and above for Linux
kernel support was the addition of a privileged instruction for SMP
support. For a UP kernel, NetBSD (and Linux) could run on an earlier
It would be wonderful to modularize the GCC support to allow
runtime choice of S/390 generation, and even S/370 support. Merging the
GCC "i370" port into the s390 port would be great. That work was not
within the mandate of the IBMers who developed the port.