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List:       linux-ia64
Subject:    Re: pgprot_writecombine & shub 1.x
From:       David Mosberger <davidm () napali ! hpl ! hp ! com>
Date:       2005-01-19 18:04:55
Message-ID: 16878.41287.397332.789804 () napali ! hpl ! hp ! com
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>>>>> On Wed, 19 Jan 2005 09:56:59 -0800, Jesse Barnes <jbarnes@sgi.com> said:

  Jesse> On Wednesday, January 19, 2005 9:53 am, David Mosberger
  Jesse> wrote:
  >> I'm still not clear which case you're concerned about: mapping
  >> I/O memory with WC or mapping real memory with WC.  For the
  >> latter, I think we may need an API to allocate memory that can be
  >> mapped WC (if possible at all).

  Jesse> Oh, I thought I said that in the first message, I'm talking
  Jesse> about I/O memory here.

OK, thanks for clarifying.

  Jesse> In any event though, we shouldn't be mapping anything with
  Jesse> the WC attribute that the EFI memory map doesn't allow.

Adding new routines for supporting this sounds reasonable, but I think
it needs to be added to linux/efi.h, since EFI isn't ia64-specific.

  Jesse> And yes, we probably do need a special allocator for mapping
  Jesse> regular memory with WC or UC attributes to avoid mapping the
  Jesse> same region with different attributes.

OK, sounds like we're in violent agreement.

	--david
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