IOTA

- implement iota panic ("dead") codes
- fix uih interrupt window condition leading to iota machine stack
  overflow and/or phantom interrupt detection
- fix iota static machine stack init value
- refactor UIH for both IOTA and PK to pull the priority table from a
  common source
- the entire INTERCME0 IRQ handler in PK is executed with EE=0, for IOTA
  this can only be emulated by masking all higher priorities in the UIH
  for that particular task/interrupt priority group

Change-Id: I4eafbe95870761bdf45ce17f9c6e0fee7a20f800
Original-Change-Id: I8357518b02922d3328aff4d80003ac3030fdd5e7
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/44135
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Brian T. Vanderpool <vanderp@us.ibm.com>
Reviewed-by: Michael S. Floyd <mfloyd@us.ibm.com>
Reviewed-by: Gregory S. Still <stillgs@us.ibm.com>

import/chips/p9/procedures/ppe_closed/cme/stop_cme/p9_cme_stop_entry.c

@@ -975,7 +975,9 @@ p9_cme_stop_entry()
                   (core << SHIFT32(15)) |
                   (core << SHIFT32(17)));
             sync();
+            wrteei(0);
             out32(CME_LCL_EIMR_OR,  (BITS32(12, 6) | BITS32(20, 2)));
+            wrteei(1);
 #endif
 
             //===================
@@ -1189,7 +1191,9 @@ p9_cme_stop_entry()
                   (core << SHIFT32(15)) |
                   (core << SHIFT32(17)));
             sync();
+            wrteei(0);
             out32(CME_LCL_EIMR_OR,  (BITS32(12, 6) | BITS32(20, 2)));
+            wrteei(1);
 #endif
 
             //===================