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Date: Sun, 6 Apr 2008 09:57:56 +0300
From: "Blue Swirl" <blauwirbel@gmail.com>
Subject: Re: [Qemu-devel] [PATCH 2/6] PCI DMA API (v2)
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To: qemu-devel@nongnu.org
Cc: kvm-devel@lists.sourceforge.net, Marcelo Tosatti <marcelo@kvack.org>, Anthony Liguori <aliguori@us.ibm.com>, Paul Brook <paul@codesourcery.com>, Aurelien Jarno <aurelien@aurel32.net>

On 4/5/08, Anthony Liguori <aliguori@us.ibm.com> wrote:
> This patch introduces a PCI DMA API and some generic code to support other DMA
>  APIs.  It introduces a IOVector type that contains physical address/length
>  pairs.  These vectors can be translated by the PCI layer and passed either to
>  generic copying functions or directly to the block or network subsystems.

But cpu_map_physical_page can't be the correct function for
translation for every case. To support Sparc IOMMU and DMA controller
I need a way to call a series of different translation functions
depending on the bus where we are. For the byte swapping case the
memcpy functions must be dynamic as well.