cpu: Don't init simple and inorder CPUs if they are defered.

initCPU() will be called to initialize switched out CPUs for the simple and
inorder CPU models. this patch prevents those CPUs from being initialized
because they should get their state from the active CPU when it is switched
out.

src/cpu/inorder/cpu.cc

@@ -792,7 +792,7 @@ InOrderCPU::init()
         thread[tid]->initMemProxies(thread[tid]->getTC());
     }
 
-    if (FullSystem) {
+    if (FullSystem && !params()->defer_registration) {
         for (ThreadID tid = 0; tid < numThreads; tid++) {
             ThreadContext *src_tc = threadContexts[tid];
             TheISA::initCPU(src_tc, src_tc->contextId());

src/cpu/simple/atomic.cc

@@ -86,7 +86,7 @@ AtomicSimpleCPU::init()
     // Initialise the ThreadContext's memory proxies
     tcBase()->initMemProxies(tcBase());
 
-    if (FullSystem) {
+    if (FullSystem && !params()->defer_registration) {
         ThreadID size = threadContexts.size();
         for (ThreadID i = 0; i < size; ++i) {
             ThreadContext *tc = threadContexts[i];

src/cpu/simple/timing.cc

@@ -68,7 +68,7 @@ TimingSimpleCPU::init()
     // Initialise the ThreadContext's memory proxies
     tcBase()->initMemProxies(tcBase());
 
-    if (FullSystem) {
+    if (FullSystem && !params()->defer_registration) {
         for (int i = 0; i < threadContexts.size(); ++i) {
             ThreadContext *tc = threadContexts[i];
             // initialize CPU, including PC