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+/*
+ * Copyright (c) 2004-2005 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * 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.
+ */
+
+/** @file
+ * Declaration of a fake device.
+ */
+
+#ifndef __ISA_FAKE_HH__
+#define __ISA_FAKE_HH__
+
+#include "dev/tsunami.hh"
+#include "base/range.hh"
+#include "dev/io_device.hh"
+
+/**
+ * IsaFake is a device that returns -1 on all reads and
+ * accepts all writes. It is meant to be placed at an address range
+ * so that an mcheck doesn't occur when an os probes a piece of hw
+ * that doesn't exist (e.g. UARTs1-3).
+ */
+class IsaFake : public PioDevice
+{
+  private:
+    /** The address in memory that we respond to */
+    Addr addr;
+
+  public:
+    /**
+      * The constructor for Tsunmami Fake just registers itself with the MMU.
+      * @param name name of this device.
+      * @param a address to respond to.
+      * @param mmu the mmu we register with.
+      * @param size number of addresses to respond to
+      */
+    IsaFake(const std::string &name, Addr a, MemoryController *mmu,
+                HierParams *hier, Bus *bus, Addr size = 0x8);
+
+    /**
+     * This read always returns -1.
+     * @param req The memory request.
+     * @param data Where to put the data.
+     */
+    virtual Fault read(MemReqPtr &req, uint8_t *data);
+
+    /**
+     * All writes are simply ignored.
+     * @param req The memory request.
+     * @param data the data to not write.
+     */
+    virtual Fault write(MemReqPtr &req, const uint8_t *data);
+
+    /**
+     * Return how long this access will take.
+     * @param req the memory request to calcuate
+     * @return Tick when the request is done
+     */
+    Tick cacheAccess(MemReqPtr &req);
+};
+
+#endif // __ISA_FAKE_HH__