Add a function to get a SimObject's memory mode and rework

the set memory mode code to only go through the change if
it is necessary

--HG--
extra : convert_revision : 28288227bb56b0a04d756776eaf0a4ff9e1f8c20

src/python/m5/SimObject.py

@@ -722,6 +722,13 @@ class SimObject(object):
         for child in self._children.itervalues():
             child.resume()
 
+    def getMemoryMode(self):
+        if not isinstance(self, m5.objects.System):
+            return None
+
+        system_ptr = internal.sim_object.convertToSystemPtr(self._ccObject)
+        return system_ptr.getMemoryMode()
+
     def changeTiming(self, mode):
         if isinstance(self, m5.objects.System):
             # i don't know if there's a better way to do this - calling