alpha,arm,mips,power,x86,cpu,sim: Cleanup activate/deactivate

activate(), suspend(), and halt() used on thread contexts had an optional
delay parameter. However this parameter was often ignored. Also, when used,
the delay was seemily arbitrarily set to 0 or 1 cycle (no other delays were
ever specified). This patch removes the delay parameter and 'Events'
associated with them across all ISAs and cores. Unused activate logic
is also removed.

2 files changed, 11 insertions, 38 deletions

diff --git a/src/cpu/minor/cpu.cc b/src/cpu/minor/cpu.cc
index f7007f6ff..45817c3a8 100644
--- a/src/cpu/minor/cpu.cc
+++ b/src/cpu/minor/cpu.cc
@@ -63,7 +63,6 @@ MinorCPU::MinorCPU(MinorCPUParams *params) :
     }
 
     threads.push_back(thread);
-    threadActivateEvents.push_back(new ThreadActivateEvent(*this, 0));
 
     thread->setStatus(ThreadContext::Halted);
 
@@ -87,7 +86,6 @@ MinorCPU::~MinorCPU()
 
     for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) {
         delete threads[thread_id];
-        delete threadActivateEvents[thread_id];
     }
 }
 
@@ -192,6 +190,9 @@ MinorCPU::startup()
 
     for (auto i = threads.begin(); i != threads.end(); i ++)
         (*i)->startup();
+
+    /* CPU state setup, activate initial context */
+    activateContext(0);
 }
 
 unsigned int
@@ -275,31 +276,20 @@ MinorCPU::takeOverFrom(BaseCPU *old_cpu)
 }
 
 void
-MinorCPU::activateContext(ThreadID thread_id, Cycles delay)
-{
-    DPRINTF(MinorCPU, "ActivateContext thread: %d delay: %d\n",
-        thread_id, delay);
-
-    if (!threadActivateEvents[thread_id]->scheduled()) {
-        schedule(threadActivateEvents[thread_id], clockEdge(delay));
-    }
-}
-
-void
-MinorCPU::ThreadActivateEvent::process()
+MinorCPU::activateContext(ThreadID thread_id)
 {
-    DPRINTFS(MinorCPU, (&cpu), "Activating thread: %d\n", thread_id);
+    DPRINTF(MinorCPU, "ActivateContext thread: %d", thread_id);
 
     /* Do some cycle accounting.  lastStopped is reset to stop the
      *  wakeup call on the pipeline from adding the quiesce period
      *  to BaseCPU::numCycles */
-    cpu.stats.quiesceCycles += cpu.pipeline->cyclesSinceLastStopped();
-    cpu.pipeline->resetLastStopped();
+    stats.quiesceCycles += pipeline->cyclesSinceLastStopped();
+    pipeline->resetLastStopped();
 
     /* Wake up the thread, wakeup the pipeline tick */
-    cpu.threads[thread_id]->activate();
-    cpu.wakeupOnEvent(Minor::Pipeline::CPUStageId);
-    cpu.pipeline->wakeupFetch();
+    threads[thread_id]->activate();
+    wakeupOnEvent(Minor::Pipeline::CPUStageId);
+    pipeline->wakeupFetch();
 }
 
 void
diff --git a/src/cpu/minor/cpu.hh b/src/cpu/minor/cpu.hh
index 80f41b5d2..507261fbd 100644
--- a/src/cpu/minor/cpu.hh
+++ b/src/cpu/minor/cpu.hh
@@ -78,23 +78,6 @@ typedef SimpleThread MinorThread;
 class MinorCPU : public BaseCPU
 {
   protected:
-    /** Event for delayed wakeup of a thread */
-    class ThreadActivateEvent : public Event
-    {
-      public:
-        MinorCPU &cpu;
-        ThreadID thread_id;
-
-        ThreadActivateEvent(MinorCPU &cpu_, ThreadID thread_id_) :
-            cpu(cpu_), thread_id(thread_id_)
-        { }
-
-        void process();
-    };
-
-    /** Events to wakeup each thread */
-    std::vector<ThreadActivateEvent *> threadActivateEvents;
-
     /** pipeline is a container for the clockable pipeline stage objects.
      *  Elements of pipeline call TheISA to implement the model. */
     Minor::Pipeline *pipeline;
@@ -184,7 +167,7 @@ class MinorCPU : public BaseCPU
     void takeOverFrom(BaseCPU *old_cpu);
 
     /** Thread activation interface from BaseCPU. */
-    void activateContext(ThreadID thread_id, Cycles delay);
+    void activateContext(ThreadID thread_id);
     void suspendContext(ThreadID thread_id);
 
     /** Interface for stages to signal that they have become active after