[RFC] x86: Unify allocation of low memory trampolines

[H. Peter Anvin]

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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