[PATCH v4 0/5] [RESEND] x86: efi: cleanups and basic 32/64-bit support

From: Olof Johansson
Date: Tue Feb 07 2012 - 19:28:20 EST


This series allows basic booting of a 32-bit kernel on 64-bit EFI and vice
versa. It's needed by Chrome OS, and we've been carrying a nasty hack
to do it that I've cleaned up and made sure it works in both directions.

Tested on Chrome OS for 64-bit EFI 32-bit kernel. Tested with an old
MacBook for 32-bit EFI, 64-bit kernel.

Note that this is required, but not sufficient, for full platform support for
EFI in a mixed environment. There is no handling of runtime services, and no
thunking for going in and out of firmware in a different mode.


Resend of the last posted version. Acked by Matt, and Matthew seems to be OK
with it as well (see http://marc.info/?l=linux-kernel&m=132578786105542).

Please consider for 3.4 merge window. Thanks!


-Olof


Changelog is:
v4:
* Removed bogus memdesc warning printout
* Fixed up printk formatting, removing redundant EFI output
* Some of the earlier cleanup was accidentally reverted by this patch, fixed.
* Reworded some messages to not have to line wrap printk strings

v3:
* Reorganized to a series of patches to make it easier to review, and
do some of the cleanups I had left out before.

v2:
* Added graceful error handling for 32-bit kernel that gets passed
EFI data above 4GB.
* Removed some warnings that were missed in first version.



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