linux-kernel - [PATCH 00/23] x86, realmode: new infrastructure for realmode code

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Message-Id: <1336501366-28617-1-git-send-email-jarkko.sakkinen@intel.com>
Date:	Tue,  8 May 2012 21:22:23 +0300
From:	Jarkko Sakkinen <jarkko.sakkinen@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-kbuild@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	Sam Ravnborg <sam@...nborg.org>,
	Joseph Cihula <joseph.cihula@...el.com>,
	Shane Wang <shane.wang@...el.com>, hpa@...ux.intel.com,
	Jarkko Sakkinen <jarkko.sakkinen@...el.com>
Subject: [PATCH 00/23] x86, realmode: new infrastructure for realmode code

I've been working together with H. Peter Anvin in order
replace the ad-hoc real-mode code inside .x86_trampoline
section with an encapsulated binary that is fully relocatable
to any memory location under 1MB. Everything that is needs to
be relocated is relocated during initialization.

Benefits:
- Simplifies things. Real-mode code does not have to find its
own location any more. This makes maintaining and extending 
this code much nicer experience.
- Cleans up code base a lot. Now real-mode code is encapsulated
from kernel both in source tree and in vmlinux.
- We can set proper permissions to pages of text, data/bss
and rodata. Before, .x86_trampoline had just rwx permissions.
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