powerpc/book3e-64/kexec: create an identity TLB mapping
book3e has no real MMU mode so we have to create an identity TLB mapping to make sure we can access the real physical address. Signed-off-by: NTiejun Chen <tiejun.chen@windriver.com> [scottwood: cleanup, and split off some changes] Signed-off-by: NScott Wood <scottwood@freescale.com>
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