From: "Jim Hull" <jim_hull@hp.com>
To: linux-ia64@vger.kernel.org
Subject: RE: [Linux-ia64] New rev 2.1 SDM for Itanium published
Date: Fri, 22 Nov 2002 18:08:39 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709805474@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590709805465@msgid-missing>
Matt wrote:
> On Thu, Nov 21, 2002 at 07:47:11AM -0800, Mallick, Asit K wrote:
> > This version includes the 3 new instructions:
> > - atomic ops (16 byte compare and exchange)
>
> I presume this one is not backwards-compatible with existing processor
> implementations?
Correct.
> If so, should this be noted somewhere so that naive
> people who read the manuals don't assume that it's implemented?
There is a new "ao" bit in CPUID[4], which as described on p. 1:32, will
be 1 only if the new larger atomic ops are implemented. Do you think
this is insufficient?
-- Jim
HP IPF Processor Architect
next prev parent reply other threads:[~2002-11-22 18:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-21 15:47 [Linux-ia64] New rev 2.1 SDM for Itanium published Mallick, Asit K
2002-11-22 9:12 ` Matt Chapman
2002-11-22 18:08 ` Jim Hull [this message]
2002-11-22 18:27 ` David Mosberger
2002-11-22 19:02 ` Jim Hull
2002-11-22 20:07 ` Bjorn Helgaas
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