Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763708AbXJETf0 (ORCPT ); Fri, 5 Oct 2007 15:35:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759460AbXJETfP (ORCPT ); Fri, 5 Oct 2007 15:35:15 -0400 Received: from de01egw01.freescale.net ([192.88.165.102]:54493 "EHLO de01egw01.freescale.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759353AbXJETfN (ORCPT ); Fri, 5 Oct 2007 15:35:13 -0400 Message-ID: <470691EB.7020209@freescale.com> Date: Fri, 05 Oct 2007 14:35:07 -0500 From: Timur Tabi Organization: Freescale User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.8.1.6) Gecko/20070802 SeaMonkey/1.1.4 MIME-Version: 1.0 To: Jan Engelhardt CC: Linux Kernel Mailing List Subject: Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN_BITFIELD References: <4706822D.4070509@freescale.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1172 Lines: 31 Jan Engelhardt wrote: > On Oct 5 2007 13:27, Timur Tabi wrote: >> What's the difference between __LITTLE_ENDIAN and __LITTLE_ENDIAN_BITFIELD? Can >> someone give me an example when __BIG_ENDIAN and __LITTLE_ENDIAN_BITFIELD would >> both be defined simultaneously? > > standard x86: > ---LSB-- ---2SB-- ---3SB-- ---MSB-- [bytes] LITTLE_ENDIAN > M765432L M765432L M765432L M765432L [bits] ?_BITFIELD > > (Not sure what bitfield type, but I'd guess BIG_ENDIAN_BITFIELD) Are you sure? I would think that all machines would have the same byte and bit endian, otherwise you'd never be able to put a 16-bit value into a shift register. Your bits will be shifted out like this: <-- 07 06 05 04 03 02 01 00 15 14 13 12 11 10 09 08 So I think x86 is: ---LSB-- ---2SB-- ---3SB-- ---MSB-- [bytes] LITTLE_ENDIAN L234567M L234567M L234567M L234567M [bits] LITTLE_ENDIAN_BITFIELD -- Timur Tabi Linux Kernel Developer @ Freescale - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/