From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1M02bl-00035V-Gs for qemu-devel@nongnu.org; Fri, 01 May 2009 19:57:33 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1M02bg-00034y-3x for qemu-devel@nongnu.org; Fri, 01 May 2009 19:57:32 -0400 Received: from [199.232.76.173] (port=47669 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1M02bf-00034v-UB for qemu-devel@nongnu.org; Fri, 01 May 2009 19:57:27 -0400 Received: from mx20.gnu.org ([199.232.41.8]:42861) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1M02bf-0006Nr-K8 for qemu-devel@nongnu.org; Fri, 01 May 2009 19:57:27 -0400 Received: from mail.codesourcery.com ([65.74.133.4]) by mx20.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1M02be-000371-Pz for qemu-devel@nongnu.org; Fri, 01 May 2009 19:57:27 -0400 From: Paul Brook Subject: Re: [Qemu-devel] [PATCH] 64 bit I/O support v7 Date: Sat, 2 May 2009 00:57:23 +0100 References: <49EDB109.5010009@earthlink.net> <49FB1302.4090904@earthlink.net> <49FB88C8.9060906@earthlink.net> In-Reply-To: <49FB88C8.9060906@earthlink.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200905020057.23902.paul@codesourcery.com> List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Robert Reif > Should a new intermediate bus layer also do byte swapping? Yes, though a bus layer isn't actually a necessary prerequisite. As I mentioned in the recent "Smarter compilation for target devices" thread[1], having individual devices do byteswapping is bogus. A while ago I reworked the TLB handling, so there should now be spare bits that can be used for things like byteswapping. Paul [1] http://lists.gnu.org/archive/html/qemu-devel/2009-04/msg01820.html