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Date: Thu, 31 May 2001 12:16:24 -0700
From: Jun Sun <jsun@mvista.com>
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To: Ralf Baechle <ralf@oss.sgi.com>
CC: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>,
   Joe deBlaquiere <jadb@redhat.com>, "Kevin D. Kissell" <kevink@mips.com>,
   linux-mips@oss.sgi.com
Subject: Re: Surprise! (Re: MIPS_ATOMIC_SET again (Re: newest kernel
References: <3B0ED686.C1D85CE1@mvista.com> <Pine.GSO.3.96.1010528172454.15200I-100000@delta.ds2.pg.gda.pl> <20010531135454.A1195@bacchus.dhis.org>
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Ralf Baechle wrote:
> 
> On Mon, May 28, 2001 at 05:34:26PM +0200, Maciej W. Rozycki wrote:
> 
> > > Alright, I rolled my sleeve and digged into IRIX 6.5, and guess what?
> > > sysmips() does NOT have MIPS_ATOMIC_SET (2001) on IRIX!  See the header below.
> >
> >  I remember Ralf writing of this being a compatibility call with RISC/OS
> > (is it the original OS of MIPS, Inc.?), IIRC.  Ralf: am I right?
> 
> Yes; this function is also implemented for IRIX 5 which we have some
> binary compatibility code for.
> 

Is anybody at all still running IRIX binary on Linux?  My impression the
compatibility is broken a while back.

> > > So apparently MIPS_ATOMIC_SET was invented for Linux only, probably just to
> > > implement _test_and_set().  (It would be interesting to see how IRIX
> > > implement _test_and_set() on MIPS I machines.  However, the machine I
> > > have access uses ll/sc instructions).
> 
> I don't recall seeing a _test_and_set() in the IRIX API/ABI.
>

It is part of SYSV MIPS supplement spec.  IRIX 6.5 has it.
 
Jun