From: lsorense@csclub.uwaterloo.ca (Lennart Sorensen)
To: Timur Tabi <timur@freescale.com>
Cc: Anton Altaparmakov <aia21@cam.ac.uk>,
Jan Engelhardt <jengelh@computergmbh.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN_BITFIELD
Date: Tue, 9 Oct 2007 13:46:23 -0400 [thread overview]
Message-ID: <20071009174623.GC4003@csclub.uwaterloo.ca> (raw)
In-Reply-To: <4706A842.9030507@freescale.com>
On Fri, Oct 05, 2007 at 04:10:26PM -0500, Timur Tabi wrote:
> Why not? I honestly don't know what x86 does, but I would think that if I
> write a 32-bit value to a memory location, that when I examine that memory
> location, all 32 bits will be in order.
>
> You're talking about byte endian. I'm talking about bit endian -- the
> order of bits within a byte. Software cannot know what the bit endian is,
> but external devices that have memory-mapped registers can know.
The guy wiring up the hardware should connect the wires correctly.
> The CPU shift operation, yes. I'm talking about shift operations on
> external memory-mapped devices.
Doesn't the bus usually have some definition of bit order which the
device would have to adhere to? After all there must be address lines
somewhere.
Does this perhaps offer anything useful?
http://www.linuxjournal.com/article/6788
--
Len Sorensen
next prev parent reply other threads:[~2007-10-09 17:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-05 18:27 Timur Tabi
2007-10-05 18:35 ` Jan Engelhardt
2007-10-05 19:35 ` Timur Tabi
2007-10-05 19:43 ` Jan Engelhardt
2007-10-05 19:47 ` Timur Tabi
2007-10-05 20:04 ` Andreas Schwab
2007-10-05 20:07 ` Timur Tabi
2007-10-05 20:34 ` linux-os (Dick Johnson)
2007-10-05 20:37 ` Timur Tabi
2007-10-05 23:27 ` Benjamin Herrenschmidt
2007-10-05 21:17 ` Andreas Schwab
2007-10-05 21:06 ` Anton Altaparmakov
2007-10-05 21:10 ` Timur Tabi
2007-10-05 21:29 ` Andreas Schwab
2007-10-05 21:32 ` Timur Tabi
2007-10-05 23:17 ` Andreas Schwab
2007-10-09 17:46 ` Lennart Sorensen [this message]
2007-10-09 17:56 ` Timur Tabi
2007-10-09 18:34 ` Lennart Sorensen
2007-10-09 18:50 ` Krzysztof Halasa
2007-10-09 18:57 ` Timur Tabi
2007-10-09 19:37 ` Krzysztof Halasa
2007-10-09 19:44 ` Timur Tabi
2007-10-09 22:11 ` Krzysztof Halasa
2007-10-09 19:11 ` Jeremy Fitzhardinge
2007-10-09 19:39 ` Krzysztof Halasa
2007-10-09 21:40 ` Jeremy Fitzhardinge
2007-10-09 22:34 ` Krzysztof Halasa
2007-10-10 12:05 ` linux-os (Dick Johnson)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20071009174623.GC4003@csclub.uwaterloo.ca \
--to=lsorense@csclub.uwaterloo.ca \
--cc=aia21@cam.ac.uk \
--cc=jengelh@computergmbh.de \
--cc=linux-kernel@vger.kernel.org \
--cc=timur@freescale.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®