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+/*
+ * Copyright (c) 2006 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
+ * Virtual Port Object Decleration. These ports incorporate some translation
+ * into their access methods. Thus you can use one to read and write data
+ * to/from virtual addresses.
+ */
+
+#ifndef __MEM_VPORT_HH__
+#define __MEM_VPORT_HH__
+
+#include "mem/port.hh"
+#include "config/full_system.hh"
+#include "arch/vtophys.hh"
+
+
+/** A class that translates a virtual address to a physical address and then
+ * calls the above read/write functions. If an execution context is provided the
+ * address can alway be translated, If not it can only be translated if it is a
+ * simple address masking operation (such as alpha super page accesses).
+ */
+
+class VirtualPort  : public FunctionalPort
+{
+  private:
+    ExecContext *xc;
+
+  public:
+    VirtualPort(ExecContext *_xc = NULL)
+        : xc(_xc)
+    {}
+
+    /** Return true if we have an exec context. This is used to prevent someone
+     * from accidently deleting the cpus statically allocated vport.
+     * @return true if an execution context isn't valid
+     */
+    bool nullExecContext() { return xc != NULL; }
+
+    /** Write a piece of data into a virtual address.
+     * @param vaddr virtual address to write to
+     * @param data data to write
+     */
+    template <typename T>
+    inline void write(Addr vaddr, T data)
+    {
+        Addr paddr;
+        if (xc)
+            paddr = TheISA::vtophys(xc,vaddr);
+        else
+            paddr = TheISA::vtophys(vaddr);
+
+        FunctionalPort::write(paddr, data);
+    }
+
+    /** Read data from a virtual address and return it.
+     * @param vaddr address to read
+     * @return data read
+     */
+
+    template <typename T>
+    inline T read(Addr vaddr)
+    {
+        Addr paddr;
+        if (xc)
+            paddr = TheISA::vtophys(xc,vaddr);
+        else
+            paddr = TheISA::vtophys(vaddr);
+
+        return FunctionalPort::read<T>(paddr);
+    }
+
+    /** Version of readblob that translates virt->phys and deals
+      * with page boundries. */
+    virtual void readBlob(Addr addr, uint8_t *p, int size);
+
+    /** Version of writeBlob that translates virt->phys and deals
+      * with page boundries. */
+    virtual void writeBlob(Addr addr, uint8_t *p, int size);
+};
+
+#endif //__MEM_VPORT_HH__
+