From: Arnd Bergmann <arnd@arndb.de>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: Pekka Paalanen <pq@iki.fi>, linux-kernel@vger.kernel.org
Subject: Re: Do cpu-endian MMIO accessors exist?
Date: Tue, 21 Jul 2009 23:15:49 +0200 [thread overview]
Message-ID: <200907212315.50225.arnd@arndb.de> (raw)
In-Reply-To: <4A662C33.7080505@gmail.com>
On Tuesday 21 July 2009, Jiri Slaby wrote:
> > Do cpu-endian MMIO accessors exist? What should I use, or do I just
> > have to use #ifdef __BIG_ENDIAN?
>
> There is __raw_readl which doesn't switch bytes.
__raw_readl is not a replacement for real accessors like
ioread32 or in_be32, because it does not synchronize with the
instruction stream.
The best solution would be if you could find a way to set
the hardware into little-endian mode on all architectures.
>From the description, it sounds like the hardware should allow that.
Arnd <><
next prev parent reply other threads:[~2009-07-21 21:17 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-21 20:42 Do cpu-endian MMIO accessors exist? Pekka Paalanen
2009-07-21 20:59 ` Jiri Slaby
2009-07-21 21:15 ` Arnd Bergmann [this message]
2009-07-21 21:33 ` Christoph Hellwig
2009-07-21 22:01 ` Arnd Bergmann
2009-07-22 17:11 ` Pekka Paalanen
2009-07-22 21:19 ` Arnd Bergmann
2009-07-23 16:23 ` Pekka Paalanen
2009-07-22 21:20 ` Arnd Bergmann
2009-07-21 21:56 ` Jiri Slaby
2009-07-21 22:05 ` Arnd Bergmann
2009-07-22 7:24 ` Jiri Slaby
2009-07-22 7:24 ` Jiri Slaby
2009-07-22 8:35 ` Arnd Bergmann
2009-07-22 8:35 ` Arnd Bergmann
2009-07-22 8:43 ` Alan Cox
2009-07-22 8:43 ` Alan Cox
2009-07-22 13:44 ` Arnd Bergmann
2009-07-22 13:44 ` Arnd Bergmann
2009-07-27 5:00 ` Paul Mundt
2009-07-27 5:00 ` Paul Mundt
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=200907212315.50225.arnd@arndb.de \
--to=arnd@arndb.de \
--cc=jirislaby@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=pq@iki.fi \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.