linux-kernel - Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN

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Message-ID: <Pine.LNX.4.64.0710052031310.13406@fbirervta.pbzchgretzou.qr>
Date:	Fri, 5 Oct 2007 20:35:08 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Timur Tabi <timur@...escale.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN_BITFIELD


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)

standard sparc:
---MSB-- ---3SB-- ---2SB-- ---LSB-- [bytes] BIG_ENDIAN
M765432L M765432L M765432L M765432L  [bits] ?_BITFIELD

(I hope I got these two right)


Theoretical machine with BIG_ENDIAN but LITTLE_ENDIAN_BITFIELD:
---MSB-- ---3SB-- ---2SB-- ---LSB--
L234567M L234567M L234567M L234567M
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