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In order to do the full context switch with address space, it's convenient to have a way to switch the address space. We already have this in our code - just pull it out to be called by the context switch code later. v2: Rebased on BDW support. Required adding BDW. Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>