From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sun, 15 Aug 1999 17:29:12 -0700 From: Richard Henderson To: Paul.Mackerras@cs.anu.edu.au Cc: Jes.Sorensen@cern.ch, dgatwood@mvista.com, Geert.Uytterhoeven@cs.kuleuven.ac.be, linuxppc-dev@lists.linuxppc.org, linux-fbdev@vuser.vu.union.edu Subject: Re: [linux-fbdev] Re: readl() and friends and eieio on PPC Message-ID: <19990815172912.A13394@cygnus.com> References: <199908152316.JAA02196@tango.anu.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <199908152316.JAA02196@tango.anu.edu.au>; from Paul Mackerras on Mon, Aug 16, 1999 at 09:16:47AM +1000 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Mon, Aug 16, 1999 at 09:16:47AM +1000, Paul Mackerras wrote: > The eieio instruction has two separate effects: > > 1. as a write barrier for writes to cacheable memory (hence wmb) > > 2. as a read/write barrier for reads and writes to non-cacheable > memory (hence iobarrier) Ah. The Alpha wmb instruction does _not_ have this second effect. r~ [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. Please check http://lists.linuxppc.org/ ]] [[ and http://www.linuxppc.org/ for useful information before posting. ]]