ppc: fix exception model for HV mode
This properly implements LPES0 handling for HV vs. !HV mode and removes the unsupported LPES1. This has been removed from the specs since ISA v2.07. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> [clg: AIL implementation was fixed in commit 5c94b2a5. This patch only contains the bits of the original patch related to LPES0 handling, adapted commit log. fixed checkpatch.pl errors. ] Signed-off-by: NCédric Le Goater <clg@kaod.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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