cpu: Unify the serialization code for all of the CPU models

Cleanup the serialization code for the simple CPUs and the O3 CPU. The
CPU-specific code has been replaced with a (un)serializeThread that
serializes the thread state / context of a specific thread. Assuming
that the thread state class uses the CPU-specific thread state uses
the base thread state serialization code, this allows us to restore a
checkpoint with any of the CPU models.

1 files changed, 24 insertions, 9 deletions

diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index 14b5586c8..3e7a6d4b6 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -524,21 +524,36 @@ BaseCPU::serialize(std::ostream &os)
 {
     SERIALIZE_SCALAR(instCnt);
 
-    /* Unlike _pid, _taskId is not serialized, as they are dynamically
-     * assigned unique ids that are only meaningful for the duration of
-     * a specific run. We will need to serialize the entire taskMap in
-     * system. */
-    SERIALIZE_SCALAR(_pid);
-
-    interrupts->serialize(os);
+    if (!_switchedOut) {
+        /* Unlike _pid, _taskId is not serialized, as they are dynamically
+         * assigned unique ids that are only meaningful for the duration of
+         * a specific run. We will need to serialize the entire taskMap in
+         * system. */
+        SERIALIZE_SCALAR(_pid);
+
+        interrupts->serialize(os);
+
+        // Serialize the threads, this is done by the CPU implementation.
+        for (ThreadID i = 0; i < numThreads; ++i) {
+            nameOut(os, csprintf("%s.xc.%i", name(), i));
+            serializeThread(os, i);
+        }
+    }
 }
 
 void
 BaseCPU::unserialize(Checkpoint *cp, const std::string &section)
 {
     UNSERIALIZE_SCALAR(instCnt);
-    UNSERIALIZE_SCALAR(_pid);
-    interrupts->unserialize(cp, section);
+
+    if (!_switchedOut) {
+        UNSERIALIZE_SCALAR(_pid);
+        interrupts->unserialize(cp, section);
+
+        // Unserialize the threads, this is done by the CPU implementation.
+        for (ThreadID i = 0; i < numThreads; ++i)
+            unserializeThread(cp, csprintf("%s.xc.%i", section, i), i);
+    }
 }
 
 void