ruby: add a prefetcher

This patch adds a prefetcher for the ruby memory system. The prefetcher
is based on a prefetcher implemented by others (well, I don't know
who wrote the original). The prefetcher does stride-based prefetching,
both unit and non-unit. It obseves the misses in the cache and trains on
these. After the training period is over, the prefetcher starts issuing
prefetch requests to the controller.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/mem/ruby/slicc_interface/AbstractController.hh b/src/mem/ruby/slicc_interface/AbstractController.hh
index c5cb46f1e..9ab924608 100644
--- a/src/mem/ruby/slicc_interface/AbstractController.hh
+++ b/src/mem/ruby/slicc_interface/AbstractController.hh
@@ -78,6 +78,10 @@ class AbstractController : public SimObject, public Consumer
     //! The return value indicates the number of messages written with the
     //! data from the packet.
     virtual uint32_t functionalWriteBuffers(PacketPtr&) = 0;
+
+    //! Function for enqueuing a prefetch request
+    virtual void enqueuePrefetch(const Address&, const RubyRequestType&)
+    { fatal("Prefetches not implemented!");}
 };
 
 #endif // __MEM_RUBY_SLICC_INTERFACE_ABSTRACTCONTROLLER_HH__