Port: Add protocol-agnostic ports in the port hierarchy

This patch adds an additional level of ports in the inheritance
hierarchy, separating out the protocol-specific and protocl-agnostic
parts. All the functionality related to the binding of ports is now
confined to use BaseMaster/BaseSlavePorts, and all the
protocol-specific parts stay in the Master/SlavePort. In the future it
will be possible to add other protocol-specific implementations.

The functions used in the binding of ports, i.e. getMaster/SlavePort
now use the base classes, and the index parameter is updated to use
the PortID typedef with the symbolic InvalidPortID as the default.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/mem/ruby/system/RubyPort.hh b/src/mem/ruby/system/RubyPort.hh
index 7cce6bac3..ab09bd90a 100644
--- a/src/mem/ruby/system/RubyPort.hh
+++ b/src/mem/ruby/system/RubyPort.hh
@@ -126,8 +126,10 @@ class RubyPort : public MemObject
 
     void init();
 
-    MasterPort &getMasterPort(const std::string &if_name, int idx);
-    SlavePort &getSlavePort(const std::string &if_name, int idx);
+    BaseMasterPort &getMasterPort(const std::string &if_name,
+                                  PortID idx = InvalidPortID);
+    BaseSlavePort &getSlavePort(const std::string &if_name,
+                                PortID idx = InvalidPortID);
 
     virtual RequestStatus makeRequest(PacketPtr pkt) = 0;
     virtual int outstandingCount() const = 0;