[RFC] Generic access to firmware environment variables

From: Jan-Benedict Glaw (jbglaw@lug-owl.de)
Date: Wed Apr 10 2002 - 13:42:31 EST

Hi!

I've developed a driver to access environment variables on Alpha
computers from userspace through procfs some time ago. These
days, I updated the driver. While doing this, I also looked
at other architectures; some of them also do have some kind
of environment variables in firmware:

        Alphas - SRM firmware
        SGI Workstations - ARCS firmware
        MIPS/ITE-Boards - PMON
        m68k/MAC - ?? (info is placed into a
                                        "bootinfo" struct)
        IA64 - (_seems_ to know about
                                        environment...)

They all access environment variables either by name, or by an
internally handles number. For Alpha, I've (now) implemented both,
access by name (if variable name is known/described) and access by
generic number.

I think it would be useful to have something like this for other
architectures as well. So I'm currently thinking about implementing a
base driver (like parport does) and additional modules to implement
machine/architecture specific access methode (like parport_pc).

It's easy to code, so what do you think of this?

MfG, JBG 

-- 
Jan-Benedict Glaw   .   jbglaw@lug-owl.de   .   +49-172-7608481
	 -- New APT-Proxy written in shell script --
	   http://lug-owl.de/~jbglaw/software/ap2/
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