From: Jonas Bonn <jonas@southpole.se>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: ioremap definition in generic io.h
Date: Wed, 29 Sep 2010 13:07:26 +0200 [thread overview]
Message-ID: <1285758446.12259.9.camel@needafix> (raw)
In-Reply-To: <4CA31AA6.7020003@gmail.com>
On Wed, 2010-09-29 at 12:53 +0200, Jiri Slaby wrote:
> On 09/29/2010 09:59 AM, Jonas Bonn wrote:
> > I'm wondering about the usefulness of the definition of ioremap and
> > __ioremap in asm-generic/io.h. How is this intended to be used? How
> > are the page tables for this mapping supposed to be constructed?
>
> Which page tables? The functions there are for machines w/o MMU with 1:1
> phys:virt mapping.
>
OK, thanks. It's not clear from asm-generic/io.h that it's intended for
NOMMU systems only. Aside from the ioremap definition, everything in
that file should be applicable generically... or am I missing something?
On another note, looking at the definitions of ioread32/iowrite32, they
imply a little-endian bus. Some architectures (e.g. Microblaze) define
these to use host-native byte ordering instead. Is there a _correct_
way these functions should be defined?
/Jonas
next prev parent reply other threads:[~2010-09-29 11:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-29 7:59 ioremap definition in generic io.h Jonas Bonn
2010-09-29 10:53 ` Jiri Slaby
2010-09-29 11:07 ` Jonas Bonn [this message]
2010-09-30 11:45 ` Arnd Bergmann
2010-09-30 11:52 ` Jonas Bonn
2010-09-30 12:04 ` Arnd Bergmann
2010-10-01 8:35 ` Jonas Bonn
2010-10-01 8:43 ` Arnd Bergmann
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