From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bjorn Helgaas Date: Fri, 22 Nov 2002 20:07:43 +0000 Subject: Re: [Linux-ia64] New rev 2.1 SDM for Itanium published Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Friday 22 November 2002 11:27 am, David Mosberger wrote: > >>>>> On Fri, 22 Nov 2002 10:08:39 -0800, "Jim Hull" said: > > >> If so, should this be noted somewhere so that naive > >> people who read the manuals don't assume that it's implemented? > > Jim> There is a new "ao" bit in CPUID[4], which as described on p. 1:32, will > Jim> be 1 only if the new larger atomic ops are implemented. Do you think > Jim> this is insufficient? > > The ao bit seems to have gotten lost in the final version of SDM2.1. > It's mentioned (indirectly) in the Document Revision history, but in > the CPUID[4] description, only "branchlong" and "spontaneous deferral" > show up. Also, seems like the cmp8xchg16 instruction description ought to mention that not all implementations support the instruction. At least, that's what was done for "brl". -- Bjorn Helgaas - bjorn_helgaas at hp.com Linux and Open Source Lab Hewlett-Packard Company