power: Low-power idle power state for idle CPUs

Add functionality to the BaseCPU that will put the entire CPU into a low-power
idle state whenever all threads in it are idle.

2 files changed, 7 insertions, 0 deletions

diff --git a/src/cpu/simple/atomic.cc b/src/cpu/simple/atomic.cc
index f3e14d401..3cd6c1666 100644
--- a/src/cpu/simple/atomic.cc
+++ b/src/cpu/simple/atomic.cc
@@ -247,6 +247,8 @@ AtomicSimpleCPU::activateContext(ThreadID thread_num)
         == activeThreads.end()) {
         activeThreads.push_back(thread_num);
     }
+
+    BaseCPU::activateContext(thread_num);
 }
 
 
@@ -273,6 +275,7 @@ AtomicSimpleCPU::suspendContext(ThreadID thread_num)
         }
     }
 
+    BaseCPU::suspendContext(thread_num);
 }
 
 
diff --git a/src/cpu/simple/timing.cc b/src/cpu/simple/timing.cc
index 43f4eb9f4..c99f9c475 100644
--- a/src/cpu/simple/timing.cc
+++ b/src/cpu/simple/timing.cc
@@ -218,6 +218,8 @@ TimingSimpleCPU::activateContext(ThreadID thread_num)
          == activeThreads.end()) {
         activeThreads.push_back(thread_num);
     }
+
+    BaseCPU::activateContext(thread_num);
 }
 
 
@@ -243,6 +245,8 @@ TimingSimpleCPU::suspendContext(ThreadID thread_num)
             deschedule(fetchEvent);
         }
     }
+
+    BaseCPU::suspendContext(thread_num);
 }
 
 bool