sim: Move mem(Writeback|Invalidate) to SimObject

The memWriteback() and memInvalidate() calls used to live in the
Serializable interface. In this series of patches, the Serializable
interface will be redesigned to make serialization independent of the
object graph and always work on the entire simulator. This means that
the Serialization interface won't be useful to perform maintenance of
the caches in a sub-graph of the entire SimObject graph. This
changeset moves these memory maintenance methods to the SimObject
interface instead.

1 files changed, 34 insertions, 0 deletions

diff --git a/src/sim/sim_object.hh b/src/sim/sim_object.hh
index 16237d051..17714740b 100644
--- a/src/sim/sim_object.hh
+++ b/src/sim/sim_object.hh
@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2015 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 2001-2005 The Regents of The University of Michigan
  * Copyright (c) 2010 Advanced Micro Devices, Inc.
  * All rights reserved.
@@ -175,6 +187,28 @@ class SimObject : public EventManager, public Serializable, public Drainable
      */
     unsigned int drain(DrainManager *drainManger);
 
+    /**
+     * Write back dirty buffers to memory using functional writes.
+     *
+     * After returning, an object implementing this method should have
+     * written all its dirty data back to memory. This method is
+     * typically used to prepare a system with caches for
+     * checkpointing.
+     */
+    virtual void memWriteback() {};
+
+    /**
+     * Invalidate the contents of memory buffers.
+     *
+     * When the switching to hardware virtualized CPU models, we need
+     * to make sure that we don't have any cached state in the system
+     * that might become stale when we return. This method is used to
+     * flush all such state back to main memory.
+     *
+     * @warn This does <i>not</i> cause any dirty state to be written
+     * back to memory.
+     */
+    virtual void memInvalidate() {};
 
     void serialize(CheckpointOut &cp) const M5_ATTR_OVERRIDE {};
     void unserialize(CheckpointIn &cp) M5_ATTR_OVERRIDE {};