add nacked result and a function to swizzle nacked packet into something that can be sent out again

implement ability for i/o devices to handle

src/dev/io_device.cc:
src/dev/io_device.hh:
    implement ability for i/o devices to handle
src/mem/packet.hh:
    add nacked result and a function to swizzle nacked packet into something that can be sent out again

--HG--
extra : convert_revision : fa42b01f4ab21562d37bd6bf6f4d7f69a94f0e86

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mem/packet.hh b/src/mem/packet.hh
index d5a10d29a..403039d96 100644
--- a/src/mem/packet.hh
+++ b/src/mem/packet.hh
@@ -179,6 +179,7 @@ class Packet
     {
         Success,
         BadAddress,
+        Nacked,
         Unknown
     };
 
@@ -249,6 +250,16 @@ class Packet
         srcValid = false;
     }
 
+    /** Take a request packet that has been returned as NACKED and modify it so
+     * that it can be sent out again. Only packets that need a response can be
+     * NACKED, so verify that that is true. */
+    void reinitNacked() {
+        assert(needsResponse() && result == Nacked);
+        dest =  Broadcast;
+        result = Unknown;
+    }
+
+
     /** Set the data pointer to the following value that should not be freed. */
     template <typename T>
     void dataStatic(T *p);