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Move pre-existing PAGE_(SHIFT|SIZE|MASK|ALIGN)_(4K|64K) and
introduce corresponding defines for 16K page granularity to/in a
common place in xen/page-defs.h to allow later commits to use the
consolidated defines.
Signed-off-by: Sergej Proskurin <proskurin@sec.in.tum.de>
Acked-by: Jan Beulich <jbeulich@suse.com>