Re: remap_page_range64() for PPC

Glenn Burkhardt
2004-10-17T13:17:12Z

On Saturday 16 October 2004 02:32 am, Matt Porter wrote:
> On Fri, Oct 15, 2004 at 11:46:42PM -0400, Glenn Burkhardt wrote:
> > I'm writing an application to run on a PowerPC with a 2.4 embedded
> > Linux kernel, and I want to make device registers for our custom
> > hardware accessable from user space with mmap(). The physical address
> > of the device is above the 4gb boundary (we attach to the 440's
> > external peripheral bus), so a standard 'remap_page_range()' call
> > won't work.
>
> <snip>
>
> This has come up several times on the ppc lists (but since we still
> don't have archives back, nobody can search anyway). I dropped
^^^^^^
> 2.4 and 2.5 patches in source.mvista.com:/pub/linuxppc/ a long
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> time ago. You just need to update your board-specific fixup routine
> in that version or just make a copy or remap_page_range() into your
> driver and use u64 for the phys address.

Do you mean that you applied a patch, or had one and decided not to
use it? I just looked at mm/memory.c didn't notice anything
substantially different in remap_page_range(). To which module was
the patch applied?

Thanks for verifying that the approach I took was correct, which was
to use u64 for the phys address for remap_page_range().