An AM34 erratum requires MMUCTR read and write on entry to certain exceptions,
prior to EPSW.NMID being cleared to allow NMIs to happen.
Signed-off-by: NAkira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: NKiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>