Support for draining, and the new method of switching out. Now switching out happens after the pipeline has been drained, deferring the three way handshake to the normal drain mechanism. The calls of switchOut() and takeOverFrom() both take action immediately.

src/cpu/o3/commit.hh:
src/cpu/o3/commit_impl.hh:
src/cpu/o3/cpu.cc:
src/cpu/o3/cpu.hh:
src/cpu/o3/decode.hh:
src/cpu/o3/decode_impl.hh:
src/cpu/o3/fetch.hh:
src/cpu/o3/fetch_impl.hh:
src/cpu/o3/iew.hh:
src/cpu/o3/iew_impl.hh:
src/cpu/o3/rename.hh:
src/cpu/o3/rename_impl.hh:
    Support for draining, new method of switching out.

--HG--
extra : convert_revision : 05bf8b271ec85b3e2c675c3bed6c42aeba21f465

1 files changed, 10 insertions, 4 deletions

diff --git a/src/cpu/o3/fetch.hh b/src/cpu/o3/fetch.hh
index 848ebf39e..9611f0455 100644
--- a/src/cpu/o3/fetch.hh
+++ b/src/cpu/o3/fetch.hh
@@ -180,11 +180,14 @@ class DefaultFetch
     /** Processes cache completion event. */
     void processCacheCompletion(PacketPtr pkt);
 
-    /** Begins the switch out of the fetch stage. */
-    void switchOut();
+    /** Begins the drain of the fetch stage. */
+    void drain();
+
+    /** Resumes execution after a drain. */
+    void resume();
 
-    /** Completes the switch out of the fetch stage. */
-    void doSwitchOut();
+    /** Tells fetch stage to prepare to be switched out. */
+    void switchOut();
 
     /** Takes over from another CPU's thread. */
     void takeOverFrom();
@@ -421,6 +424,9 @@ class DefaultFetch
      */
     bool interruptPending;
 
+    /** Is there a drain pending. */
+    bool drainPending;
+
     /** Records if fetch is switched out. */
     bool switchedOut;