Merge remote-tracking branch 'rth/axp-next' into staging

# By Richard Henderson
# Via Richard Henderson
* rth/axp-next:
  target-alpha: Implement the typhoon iommu
  target-alpha: Consider the superpage when threading and ending TBs
  target-alpha: Use goto_tb in call_pal
  target-alpha: Implement call_pal without an exception

Message-id: 1376720412-2165-1-git-send-email-rth@twiddle.net
Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>