* H. Peter Anvin <[EMAIL PROTECTED]> wrote:
> I did a quick scan over the patchset (not quite awake yet, so I may
> very well have missed something), but it looks like EFI (again!) is
> the only user of ioremapping before paging_init(). This makes me
> wonder if that code can't be restructured so that isn't necessary.
i think that in general making access to unmapped memory a bit easier is
generally a good robustness idea as ACPI could be impacted by it as
well.
Fundamentally, paging_init() has obvious dependency on "figuring out the
memory setup" of the box, and "figuring out the memory setup" means
interpreting various data structures passed in by the BIOS - some of
which might be in not yet mapped areas or iommu areas (if we have to do
some early quirk). So having a robust implementation of ioremap_early()
sounds like a definitive plus.
Ingo
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