Ruby: Add support for functional accesses

This patch rpovides functional access support in Ruby. Currently only
the M5Port of RubyPort supports functional accesses. The support for
functional through the PioPort will be added as a separate patch.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/mem/packet.hh b/src/mem/packet.hh
index 5fcd9286e..be0c20d42 100644
--- a/src/mem/packet.hh
+++ b/src/mem/packet.hh
@@ -103,6 +103,8 @@ class MemCmd
         NetworkNackError,  // nacked at network layer (not by protocol)
         InvalidDestError,  // packet dest field invalid
         BadAddressError,   // memory address invalid
+        FunctionalReadError, // unable to fulfill functional read
+        FunctionalWriteError, // unable to fulfill functional write
         // Fake simulator-only commands
         PrintReq,       // Print state matching address
         FlushReq,      //request for a cache flush
@@ -240,6 +242,9 @@ class Packet : public FastAlloc, public Printable
     /// the data pointer points to an array (thus delete []) needs to
     /// be called on it rather than simply delete.
     static const FlagsType ARRAY_DATA             = 0x00004000;
+    /// suppress the error if this packet encounters a functional
+    /// access failure.
+    static const FlagsType SUPPRESS_FUNC_ERROR    = 0x00008000;
 
     Flags flags;
 
@@ -428,6 +433,8 @@ class Packet : public FastAlloc, public Printable
     void setSupplyExclusive()   { flags.set(SUPPLY_EXCLUSIVE); }
     void clearSupplyExclusive() { flags.clear(SUPPLY_EXCLUSIVE); }
     bool isSupplyExclusive()    { return flags.isSet(SUPPLY_EXCLUSIVE); }
+    void setSuppressFuncError() { flags.set(SUPPRESS_FUNC_ERROR); }
+    bool suppressFuncError()    { return flags.isSet(SUPPRESS_FUNC_ERROR); }
 
     // Network error conditions... encapsulate them as methods since
     // their encoding keeps changing (from result field to command
@@ -617,6 +624,18 @@ class Packet : public FastAlloc, public Printable
         makeResponse();
     }
 
+    void
+    setFunctionalResponseStatus(bool success)
+    {
+        if (!success) {
+            if (isWrite()) {
+                cmd = MemCmd::FunctionalWriteError;
+            } else {
+                cmd = MemCmd::FunctionalReadError;
+            }
+        }
+    }
+
     /**
      * Take a request packet that has been returned as NACKED and
      * modify it so that it can be sent out again. Only packets that