cpu: provide a wakeup mechanism that can be used to pull CPUs out of sleep.

Make interrupts use the new wakeup method, and pull all of the interrupt
stuff into the cpu base class so that only the wakeup code needs to be updated.
I tried to make wakeup, wakeCPU, and the various other mechanisms for waking
and sleeping a little more sane, but I couldn't understand why the statistics
were changing the way they were.  Maybe we'll try again some day.

src/cpu/base.cc

@@ -389,24 +389,6 @@ BaseCPU::ProfileEvent::process()
     cpu->schedule(this, curTick + interval);
 }
 
-void
-BaseCPU::postInterrupt(int int_num, int index)
-{
-    interrupts->post(int_num, index);
-}
-
-void
-BaseCPU::clearInterrupt(int int_num, int index)
-{
-    interrupts->clear(int_num, index);
-}
-
-void
-BaseCPU::clearInterrupts()
-{
-    interrupts->clearAll();
-}
-
 void
 BaseCPU::serialize(std::ostream &os)
 {

src/cpu/base.hh

@@ -125,9 +125,26 @@ class BaseCPU : public MemObject
         return interrupts;
     }
 
-    virtual void postInterrupt(int int_num, int index);
-    virtual void clearInterrupt(int int_num, int index);
-    virtual void clearInterrupts();
+    virtual void wakeup() = 0;
+
+    void
+    postInterrupt(int int_num, int index)
+    {
+        interrupts->post(int_num, index);
+        wakeup();
+    }
+
+    void
+    clearInterrupt(int int_num, int index)
+    {
+        interrupts->clear(int_num, index);
+    }
+
+    void
+    clearInterrupts()
+    {
+        interrupts->clearAll();
+    }
 
     bool
     checkInterrupts(ThreadContext *tc) const

src/cpu/o3/cpu.cc

@@ -893,18 +893,6 @@ FullO3CPU<Impl>::activateWhenReady(int tid)
 }
 
 #if FULL_SYSTEM
-template <class Impl>
-void
-FullO3CPU<Impl>::postInterrupt(int int_num, int index)
-{
-    BaseCPU::postInterrupt(int_num, index);
-
-    if (this->thread[0]->status() == ThreadContext::Suspended) {
-        DPRINTF(IPI,"Suspended Processor awoke\n");
-        this->threadContexts[0]->activate();
-    }
-}
-
 template <class Impl>
 Fault
 FullO3CPU<Impl>::hwrei(unsigned tid)
@@ -1689,6 +1677,21 @@ FullO3CPU<Impl>::wakeCPU()
     schedule(tickEvent, nextCycle());
 }
 
+#if FULL_SYSTEM
+template <class Impl>
+void
+FullO3CPU<Impl>::wakeup()
+{
+    if (this->thread[0]->status() != ThreadContext::Suspended)
+        return;
+
+    this->wakeCPU();
+
+    DPRINTF(Quiesce, "Suspended Processor woken\n");
+    this->threadContexts[0]->activate();
+}
+#endif
+
 template <class Impl>
 int
 FullO3CPU<Impl>::getFreeTid()

src/cpu/o3/cpu.hh

@@ -402,9 +402,6 @@ class FullO3CPU : public BaseO3CPU
     void trap(Fault fault, unsigned tid);
 
 #if FULL_SYSTEM
-    /** Posts an interrupt. */
-    void postInterrupt(int int_num, int index);
-
     /** HW return from error interrupt. */
     Fault hwrei(unsigned tid);
 
@@ -701,6 +698,10 @@ class FullO3CPU : public BaseO3CPU
     /** Wakes the CPU, rescheduling the CPU if it's not already active. */
     void wakeCPU();
 
+#if FULL_SYSTEM
+    virtual void wakeup();
+#endif
+
     /** Gets a free thread id. Use if thread ids change across system. */
     int getFreeTid();
 

src/cpu/ozone/cpu.hh

@@ -333,7 +333,7 @@ class OzoneCPU : public BaseCPU
     Status _status;
 
   public:
-    void postInterrupt(int int_num, int index);
+    void wakeup();
 
     void zero_fill_64(Addr addr) {
         static int warned = 0;

src/cpu/ozone/cpu_impl.hh

@@ -582,10 +582,8 @@ OzoneCPU<Impl>::dbg_vtophys(Addr addr)
 #if FULL_SYSTEM
 template <class Impl>
 void
-OzoneCPU<Impl>::postInterrupt(int int_num, int index)
+OzoneCPU<Impl>::wakeup()
 {
-    BaseCPU::postInterrupt(int_num, index);
-
     if (_status == Idle) {
         DPRINTF(IPI,"Suspended Processor awoke\n");
 //      thread.activate();

src/cpu/simple/base.cc

@@ -303,14 +303,13 @@ BaseSimpleCPU::dbg_vtophys(Addr addr)
 
 #if FULL_SYSTEM
 void
-BaseSimpleCPU::postInterrupt(int int_num, int index)
+BaseSimpleCPU::wakeup()
 {
-    BaseCPU::postInterrupt(int_num, index);
+    if (thread->status() != ThreadContext::Suspended)
+        return;
 
-    if (thread->status() == ThreadContext::Suspended) {
-                DPRINTF(Quiesce,"Suspended Processor awoke\n");
-        thread->activate();
-    }
+    DPRINTF(Quiesce,"Suspended Processor awoke\n");
+    thread->activate();
 }
 #endif // FULL_SYSTEM
 

src/cpu/simple/base.hh

@@ -98,7 +98,7 @@ class BaseSimpleCPU : public BaseCPU
     }
 
   public:
-    void postInterrupt(int int_num, int index);
+    void wakeup();
 
     void zero_fill_64(Addr addr) {
       static int warned = 0;