linux-kernel - RE : Re: [PATCH 5/5] x86_64 EFI support -v3: EFI document

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Date:	Thu, 9 Aug 2007 13:23:56 +0200 (CEST)
From:	Etienne Lorrain <etienne_lorrain@...oo.fr>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com
Subject: RE : Re: [PATCH 5/5] x86_64 EFI support -v3: EFI document

--- Andi Kleen <ak@...e.de> wrote:
> >  Note that Gujin has a simple problem by using that 32 bits entry point:
> 
> There is really no 32bit entry point today usable for external users.

 That is why I added the 16 bits entry point support (selected by default),
my target with Gujin was not only to load Linux but also another simpler
format - gzip'ed ELF 32/64 files with real-mode embedded at address 0 .
 I also had to show that it was possible to write the Linux-real-mode
code in C with GCC so that someone else would do it and maintain it.
 I may (in few version) remove Gujin code which fills Linux zero-page
structure if the 16 bit entry point works in all cases (mostly in DOS
which help me to create a DBG debug file to sort out Gujin/BIOS problems
remotely).
 I may maintain another patch to produce this gzip'ed ELF32/64 for Linux
as an example of how to use that Gujin interface, but that is not really
related. That patch is in Gujin Sourceforge download.
 Note that I call (instead of jump to) the 16 bits entry point so that
this "function" can return to the bootloader if it detects a problem.

 Etienne.

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