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authorAli Saidi <Ali.Saidi@ARM.com>2012-05-10 18:04:26 -0500
committerAli Saidi <Ali.Saidi@ARM.com>2012-05-10 18:04:26 -0500
commitf6895e8bd46a1533c607fe528a2da68b64e722dc (patch)
tree62f2225f891dcf1201bde837f1b918aa3e3c7679 /src
parentdc456d8166fce16c3af26f09405b0bf91ff1e38f (diff)
downloadgem5-f6895e8bd46a1533c607fe528a2da68b64e722dc.tar.xz
Cache: Panic if you attempt to create a checkpoint with a cache in the system
Diffstat (limited to 'src')
-rw-r--r--src/mem/cache/cache.hh6
-rw-r--r--src/mem/cache/cache_impl.hh29
2 files changed, 35 insertions, 0 deletions
diff --git a/src/mem/cache/cache.hh b/src/mem/cache/cache.hh
index d2110adce..ce68b2405 100644
--- a/src/mem/cache/cache.hh
+++ b/src/mem/cache/cache.hh
@@ -370,6 +370,12 @@ class Cache : public BaseCache
* Find next request ready time from among possible sources.
*/
Tick nextMSHRReadyTime();
+
+ /** serialize the state of the caches
+ * We currently don't support checkpointing cache state, so this panics.
+ */
+ virtual void serialize(std::ostream &os);
+ void unserialize(Checkpoint *cp, const std::string &section);
};
#endif // __CACHE_HH__
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index 008bbb8d9..3312fc941 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -1539,6 +1539,35 @@ Cache<TagStore>::nextMSHRReadyTime()
return nextReady;
}
+template<class TagStore>
+void
+Cache<TagStore>::serialize(std::ostream &os)
+{
+ warn("*** Creating checkpoints with caches is not supported. ***\n");
+ warn(" Remove any caches before taking checkpoints\n");
+ warn(" This checkpoint will not restore correctly and dirty data in "
+ "the cache will be lost!\n");
+
+ // Since we don't write back the data dirty in the caches to the physical
+ // memory if caches exist in the system we won't be able to restore
+ // from the checkpoint as any data dirty in the caches will be lost.
+
+ bool bad_checkpoint = true;
+ SERIALIZE_SCALAR(bad_checkpoint);
+}
+
+template<class TagStore>
+void
+Cache<TagStore>::unserialize(Checkpoint *cp, const std::string &section)
+{
+ bool bad_checkpoint;
+ UNSERIALIZE_SCALAR(bad_checkpoint);
+ if (bad_checkpoint) {
+ fatal("Restoring from checkpoints with caches is not supported in the "
+ "classic memory system. Please remove any caches before taking "
+ "checkpoints.\n");
+ }
+}
///////////////
//