linux-kernel - Re: [PATCH v5 5/5] x86: efi: allow basic init with mixed 32/64-bit efi/kernel

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Date:	Wed, 15 Feb 2012 13:33:42 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Olof Johansson <olof@...om.net>
Cc:	x86@...nel.org, hpa@...or.com, mingo@...e.hu, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, mjg@...hat.com
Subject: Re: [PATCH v5 5/5] x86: efi: allow basic init with mixed 32/64-bit
 efi/kernel

On Sun, 2012-02-12 at 13:24 -0800, Olof Johansson wrote:
> Traditionally the kernel has refused to setup EFI at all if there's been
> a mismatch in 32/64-bit mode between EFI and the kernel.
> 
> On some platforms that boot natively through EFI (Chrome OS being one),
> we still need to get at least some of the static data such as memory
> configuration out of EFI. Runtime services aren't as critical, and
> it's a significant amount of work to implement switching between the
> operating modes to call between kernel and firmware for thise cases. So
> I'm ignoring it for now.
> 
> v5:
> * Fixed some printk strings based on feedback
> * Renamed 32/64-bit specific types to not have _ prefix
> * Fixed bug in printout of efi runtime disablement
> 
> v4:
> * 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.
> 
> Signed-off-by: Olof Johansson <olof@...om.net>
> ---
>  arch/x86/include/asm/efi.h  |    2 +-
>  arch/x86/kernel/setup.c     |   10 ++-
>  arch/x86/platform/efi/efi.c |  164 +++++++++++++++++++++++++++++++++++++------
>  include/linux/efi.h         |   45 ++++++++++++
>  4 files changed, 196 insertions(+), 25 deletions(-)

Acked-by: Matt Fleming <matt.fleming@...el.com>

-- 
Matt Fleming, Intel Open Source Technology Center

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