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diff --git a/src/arch/arm/fastmodel/GIC/commands.hh b/src/arch/arm/fastmodel/GIC/commands.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_GIC_COMMANDS_HH__
+#define __ARCH_ARM_FASTMODEL_GIC_COMMANDS_HH__
+
+#include <cstdint>
+
+#include "base/logging.hh"
+#include "sg/SGSignal.h"
+
+namespace FastModel
+{
+
+class PPICommand
+{
+  private:
+    uint8_t _cpu;
+    uint32_t _num;
+    sg::Signal::State _state;
+
+  public:
+    PPICommand(uint8_t c, uint32_t n, bool set) :
+        _cpu(c), _num(n), _state(set ? sg::Signal::Set : sg::Signal::Clear)
+    {
+        panic_if(_cpu > 255, "PPICommand CPU out of bounds");
+        panic_if(_num > 15, "PPICommand number out of bounds");
+    }
+
+    PPICommand() : PPICommand(0, 0, false) {}
+
+    uint8_t cpu() const { return _cpu; }
+    uint32_t num() const { return _num; }
+    sg::Signal::State state() const { return _state; }
+};
+
+class SPICommand
+{
+  private:
+    uint32_t _num;
+    sg::Signal::State _state;
+
+  public:
+    SPICommand(uint32_t n, bool set) :
+        _num(n), _state(set ? sg::Signal::Set : sg::Signal::Clear)
+    {
+        panic_if(_num > 987, "SPICommand number out of bounds");
+    }
+
+    SPICommand() : SPICommand(0, false) {}
+
+    uint32_t num() const { return _num; }
+    sg::Signal::State state() const { return _state; }
+};
+
+} // namespace FastModel
+
+#endif // __ARCH_ARM_FASTMODEL_GIC_COMMANDS_HH__