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diff --git a/src/arch/arm/fastmodel/protocol/signal_interrupt.hh b/src/arch/arm/fastmodel/protocol/signal_interrupt.hh
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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
+ */
+
+#ifndef __ARCH_ARM_FASTMODEL_PROTOCOL_SIGNAL_INTERRUPT_HH__
+#define __ARCH_ARM_FASTMODEL_PROTOCOL_SIGNAL_INTERRUPT_HH__
+
+#include <string>
+#include <systemc>
+#include <tlm>
+
+struct SignalInterruptDummyProtocolType {};
+
+class SignalInterruptFwIf : public virtual sc_core::sc_interface
+{
+  public:
+    virtual ~SignalInterruptFwIf() {}
+    virtual void ppi(uint8_t cpu, uint32_t num, bool state) = 0;
+    virtual void spi(uint32_t num, bool state) = 0;
+};
+
+class SignalInterruptBwIf : public virtual sc_core::sc_interface
+{
+  public:
+    virtual ~SignalInterruptBwIf() {}
+};
+
+class SignalInterruptSlaveBase : public SignalInterruptFwIf
+{
+  public:
+    SignalInterruptSlaveBase(const std::string &name) {}
+};
+
+class SignalInterruptInitiatorSocket :
+    public tlm::tlm_base_initiator_socket<64, SignalInterruptFwIf,
+                                          SignalInterruptBwIf>
+{
+  private:
+    SignalInterruptBwIf dummyBwIf;
+
+  public:
+    typedef tlm::tlm_base_initiator_socket<64, SignalInterruptFwIf,
+                                           SignalInterruptBwIf> Base;
+
+    using Base::bind;
+    using Base::operator();
+
+    SignalInterruptInitiatorSocket() : Base()
+    {
+        get_base_export().bind(dummyBwIf);
+    }
+    SignalInterruptInitiatorSocket(const char *name) : Base(name)
+    {
+        get_base_export().bind(dummyBwIf);
+    }
+
+    const char *
+    kind() const override
+    {
+        return "SignalInterruptInitiatorSocket";
+    }
+
+    std::type_index
+    get_protocol_types() const override
+    {
+        return typeid(SignalInterruptDummyProtocolType);
+    }
+};
+
+class SignalInterruptTargetSocket :
+    public tlm::tlm_base_target_socket<64, SignalInterruptFwIf,
+                                       SignalInterruptBwIf>
+{
+  public:
+    typedef tlm::tlm_base_target_socket<64, SignalInterruptFwIf,
+                                        SignalInterruptBwIf> Base;
+
+    using Base::bind;
+    using Base::operator();
+
+    using Base::Base;
+
+    const char *
+    kind() const override
+    {
+        return "SignalInterruptInitiatorSocket";
+    }
+
+    std::type_index
+    get_protocol_types() const override
+    {
+        return typeid(SignalInterruptDummyProtocolType);
+    }
+};
+
+#endif // __ARCH_ARM_FASTMODEL_PROTOCOL_SIGNAL_INTERRUPT_HH__