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Re: CVS Update@-mips.org: linux

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: CVS Update@-mips.org: linux
From: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Date: Tue, 22 Jul 2003 23:37:44 +0200 (MET DST)
Cc: Keith M Wesolowski <wesolows@foobazco.org>, "Kevin D. Kissell" <kevink@mips.com>, linux-mips@linux-mips.org
In-reply-to: <20030722212117.GB1660@linux-mips.org>
Organization: Technical University of Gdansk
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
On Tue, 22 Jul 2003, Ralf Baechle wrote:

> And yes, the R6000 is different.  With that in mind R2000 and R4000 look
> like enzygotic twins ...

 ;-)

> > 2. A better visual existence of the 64-bit port; not really a technical
> > advantage, but more a psychological one.  It stops any newcomer wondering
> > whether we support 64-bit systems natively or not. 
> 
> I was thinking about that also.  arch/mips64 and include/asm-mips64 will
> go away but on the other side there will be an option to configure a
> 64-bit kernel in the menus - which will hopefully be more visible than
> just two subdirectories.

 Well, as long as one get that far to run a configuration script (BTW,
what menus are you referring to? -- I haven't seen any).  Right now that's
easily visible straight in the archive which is now even browsable in the
Internet here and there -- Q: "What architectures are supported?" A: "See
the subdirectories of arch/." 

> Btw, an old experience repeats - some of the code was identical except
> inline assembler using addu etc. for 32-bit and daddu etc. for 64-bit.
> I rewrote that stuff to use C for this arithmetic.  The result - less
> inline assembler, more readable code and a file that's identical for
> both 32-bit and 64-bit.

 Well, whatever is plain C code (or should be such) should be identical,
indeed, but macros will differ as will low-level assembly.  Then add
64-bit specific options and you get yet more complication. 

 I hope `uname -m' will continue to report the correct architecture and
that ARCH will be correctly handled (i.e. "mips" selecting a 32-bit build
and "mips64" a 64-bit one) -- have you considered this?

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +


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