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diff --git a/src/dev/IntPin.py b/src/dev/IntPin.py
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+# Copyright 2019 Google, Inc.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Gabe Black
+
+from m5.params import Port, VectorPort
+
+INT_SOURCE_ROLE = 'Int Source Pin'
+INT_SINK_ROLE = 'Int Sink Pin'
+Port.compat(INT_SOURCE_ROLE, INT_SINK_ROLE)
+
+# A source pin generally represents a single pin which might connect to
+# multiple sinks.
+class IntSourcePin(VectorPort):
+    def __init__(self, desc):
+        super(IntSourcePin, self).__init__(
+                INT_SOURCE_ROLE, desc, is_source=True)
+
+# Each "physical" pin can be driven by a single source pin since there are no
+# provisions for resolving competing signals running to the same pin.
+class IntSinkPin(Port):
+    def __init__(self, desc):
+        super(IntSinkPin, self).__init__(INT_SINK_ROLE, desc)
+
+# A vector of sink pins represents a bank of physical pins. For instance, an
+# interrupt controller with many numbered input interrupts could represent them
+# as a VectorIntSinkPin.
+class VectorIntSinkPin(VectorPort):
+    def __init__(self, desc):
+        super(VectorIntSinkPin, self).__init__(INT_SINK_ROLE, desc)