SP ATTN area relative addressing cleanup

This change attemps to remove some technical debt incurred by the
"HRMOR relative addressing for PHyp SP ATTN area dump" commit.

Change-Id: I773c25e6f704fba561aa78106120325562698e4e
RTC:186439
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/61099
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Nicholas E. Bofferding <bofferdn@us.ibm.com>
Reviewed-by: Michael Baiocchi <mbaiocch@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: ILYA SMIRNOV <ismirno@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/include/usr/runtime/runtime.H b/src/include/usr/runtime/runtime.H
index 3ac97e81a..b5e717e2b 100644
--- a/src/include/usr/runtime/runtime.H
+++ b/src/include/usr/runtime/runtime.H
@@ -32,6 +32,9 @@
 #include <hdat/hdat.H>
 #include "../../../src/usr/runtime/hdatstructs.H"
 #include <vmmconst.h>
+#include <sys/misc.h>
+#include <kernel/vmmmgr.H>
+
 
 namespace RUNTIME
 {
@@ -371,6 +374,22 @@ void findHdatLocation(uint64_t payloadBase_va,
  */
 errlHndl_t getRsvdMemTraceBuf(uint64_t& o_RsvdMemAddress, uint64_t& o_size);
 
+
+/*
+ *  @brief Calculates the node's proposed start address for the system's
+ *         SP ATTN areas, which becomes the effective configuration if it's
+ *         elected as the master.
+ *
+ *  @return uint64_t Absolute start address for the intended SP ATTN areas
+ */
+inline uint64_t calcSpAttnAreaStart()
+{
+    auto hrmorVal = cpu_spr_value(CPU_SPR_HRMOR);
+    return  (hrmorVal - VMM_HRMOR_OFFSET + PHYP_ATTN_AREA_OFFSET)
+                                              | VmmManager::FORCE_PHYS_ADDR;
+}
+
+
 }
 
 #endif