From: Matt Porter <porter@cox.net>
To: Vishwanath <vishwanath@mistralsoftware.com>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: ioremap64 and remap_page_range in 440GP
Date: Sun, 5 Jan 2003 21:10:07 -0700 [thread overview]
Message-ID: <20030105211007.C22675@home.com> (raw)
In-Reply-To: <001801c2b161$5fa973c0$faffa8c0@VISHWANATH>; from vishwanath@mistralsoftware.com on Wed, Jan 01, 2003 at 12:15:29PM +0530
On Wed, Jan 01, 2003 at 12:15:29PM +0530, Vishwanath wrote:
>
> Hi All,
>
> In PPC Linux, to bring a particular IO page onto Linux addressing space, we
> use ioremap64(). Is my understanding correct? If I want to map this remapped
Yes.
> address on user space, I have to use remap_page_range() of kernel in my
> driver. remap_page_range() takes a 32-bit physical address as argument. But
> in 440GP, all addresses are 36-bit with respect to processor. Is there any
> 64-bit equivalent of remap_page_range(). If it exists, how to use it?
There's a patch to make remap_page_range() use a phys_addr_t and to use
the same bigphys fixups that ioremap() on 440gp uses. Part of it is
a bit of hack which is why it's not being commited. See the changeset
description in linuxppc_2_4_devel or linuxppc-2.5 for a pointer to
pick up the patch.
Regards,
--
Matt Porter
porter@cox.net
This is Linux Country. On a quiet night, you can hear Windows reboot.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2003-01-06 4:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-01 6:45 ioremap64 and remap_page_range in 440GP Vishwanath
2003-01-06 4:10 ` Matt Porter [this message]
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