CPUID module

[Robert Millan]

Here's a patch to implement cpuid.mod.  This module checks for CPU features
(currently only the long_mode flag, but more could be added if needed) using
cpuid.  The idea behind this is that grub.cfg scripts can use it to decide
wether a 64-bit or 32-bit Linux image should be boot (e.g. like Debian
multiarch CDs do).  I haven't investigated what the syntax for that hack
would be, although I assume it's possible.

Cpuid detection code has been borrowed from gcc and is FSF-copyrighted.

I'm not sure where would the file go.  I noticed that other utility modules
(e.g. hello/hello.c) add themselves in the top dir, so I suppose i386/cpuid.c
would be ok?

Or perhaps we could have an "util" dir for modules?

-- 
Robert Millan

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