Right now a single thread cpu 1 could get assigned context Id != 1, depending

on the order in which it's registered with the system.  To make them match,
here is a little change.

src/cpu/base.cc

@@ -285,7 +285,17 @@ BaseCPU::registerThreadContexts()
     for (int i = 0; i < threadContexts.size(); ++i) {
         ThreadContext *tc = threadContexts[i];
 
-        tc->setContextId(system->registerThreadContext(tc));
+        /** This is so that contextId and cpuId match where there is a
+         * 1cpu:1context relationship.  Otherwise, the order of registration
+         * could affect the assignment and cpu 1 could have context id 3, for
+         * example.  We may even want to do something like this for SMT so that
+         * cpu 0 has the lowest thread contexts and cpu N has the highest, but
+         * I'll just do this for now
+         */
+        if (number_of_threads == 1)
+            tc->setContextId(system->registerThreadContext(tc, _cpuId));
+        else
+            tc->setContextId(system->registerThreadContext(tc));
 #if !FULL_SYSTEM
         tc->getProcessPtr()->assignThreadContext(tc->contextId());
 #endif