Refactor crossystem to move x86-specific implementation to its own file.

Refactor crossystem to move x86-specific implementation to its own file.

This should be ready for the ARM team to pick up and work on.  I added
a placeholder ARM implementation file, though it's not hooked up in
the Makefile yet.

As soon as you implement the VbNvStorage APIs, all the related
crossystem commands will start working.  Ditto for VbSharedData.

The params which x86 gets from ACPI you'll need to get from u-boot
somehow, probably via your own kernel driver.

R=robotboy@chromium.org
BUG=chromium-os:12522
TEST=emerge-x86-alex vboot_reference, make sure it still works on x86

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=eb59195

[robotboy, 2011-03-30 23:20:56]

Rong is a better person for this review since he will be working with the ARM
part of this tool.  I've also CC'ed other firmware folk in Taiwan.

[Randall Spangler, 2011-04-04 16:38:53]

Can someone, anyone, look at this review, and at least determine it does no harm
to x86?  Taiwan's on vacation until Wed.

Thanks
    Randall

[rongchang, 2011-04-04 17:45:15]

Sorry for the late. I was trying to implement the kernel driver part that can
work with an unmodified corssystem. So is it possible to pend this refactoring
for several days?

On 2011/04/04 16:38:53, Randall Spangler wrote:
> Can someone, anyone, look at this review, and at least determine it does no
harm
> to x86?  Taiwan's on vacation until Wed.
> 
> Thanks
>     Randall

[Olof Johansson, 2011-04-04 23:12:47]

Rong, I think this is a step in the right direction even if the kernel part is
not ready yet -- especially since it allows us to set developer mode to true by
default until the logic has been wired up.

I don't see how we can share the kernel<>userspace interface for all of the
implementation, since it's inherently ACPI-specific on x86 for example. So we
will need to make this differentiation no matter what.

[Olof Johansson, 2011-04-07 02:48:52]

LGTM, let's get this in for now and we can improve later.