linux-kernel - [RFC] x86: Unify allocation of low memory trampolines

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Message-ID: <4D5DFBE4.7090104@intel.com>
Date:	Thu, 17 Feb 2011 20:56:04 -0800
From:	"H. Peter Anvin" <h.peter.anvin@...el.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthieu Castet <castet.matthieu@...e.fr>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [RFC] x86: Unify allocation of low memory trampolines

This patchset unifies all the allocation of low memory (a.k.a. realmode
memory, low megabyte) code (currently there are three users of low
memory: BIOS reboot, suspend, and of course the SMP trampoline -- there
is at least one additional one coming down the pipe in the near term)
and reserves and installs them as a single memory object very early
during initialization.  This means the original can be put in initrodata
and discarded after the allocation is done.

I consider this patchset to be a first step: the next step is to
actually link all the realmode code together into a single common
address space before encapsulation.  This will enable X/W separation as
well as provide an even more natural way to access symbols in the real
mode object.

	-hpa
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