CPU: Moving towards a more general port across CPU models

This patch performs minimal changes to move the instruction and data
ports from specialised subclasses to the base CPU (to the largest
degree possible). Ultimately it servers to make the CPU(s) have a
well-defined interface to the memory sub-system.

1 files changed, 62 insertions, 0 deletions

diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index c37f45856..2fe41cd4d 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2011 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 2002-2005 The Regents of The University of Michigan
  * Copyright (c) 2011 Regents of the University of California
  * All rights reserved.
@@ -485,3 +497,53 @@ BaseCPU::traceFunctionsInternal(Addr pc)
         functionEntryTick = curTick();
     }
 }
+
+bool
+BaseCPU::CpuPort::recvTiming(PacketPtr pkt)
+{
+    panic("BaseCPU doesn't expect recvTiming callback!");
+    return true;
+}
+
+void
+BaseCPU::CpuPort::recvRetry()
+{
+    panic("BaseCPU doesn't expect recvRetry callback!");
+}
+
+Tick
+BaseCPU::CpuPort::recvAtomic(PacketPtr pkt)
+{
+    panic("BaseCPU doesn't expect recvAtomic callback!");
+    return curTick();
+}
+
+void
+BaseCPU::CpuPort::recvFunctional(PacketPtr pkt)
+{
+    // No internal storage to update (in the general case). In the
+    // long term this should never be called, but that assumed a split
+    // into master/slave and request/response.
+}
+
+void
+BaseCPU::CpuPort::recvStatusChange(Status status)
+{
+    if (status == RangeChange) {
+        if (!snoopRangeSent) {
+            snoopRangeSent = true;
+            sendStatusChange(Port::RangeChange);
+        }
+        return;
+    }
+
+    panic("BaseCPU doesn't expect recvStatusChange callback!");
+}
+
+void
+BaseCPU::CpuPort::getDeviceAddressRanges(AddrRangeList& resp,
+                                         bool& snoop)
+{
+    resp.clear();
+    snoop = false;
+}