merge with m5 head

--HG--
extra : convert_revision : c90339248d1ee74df1c6b90a77ec9ea41f646311

9 files changed, 391 insertions, 62 deletions

diff --git a/dev/alpha_console.cc b/dev/alpha_console.cc
index ad9d0a239..f592b239d 100644
--- a/dev/alpha_console.cc
+++ b/dev/alpha_console.cc
@@ -43,6 +43,9 @@
 #include "dev/console.hh"
 #include "dev/simple_disk.hh"
 #include "dev/tlaser_clock.hh"
+#include "mem/bus/bus.hh"
+#include "mem/bus/pio_interface.hh"
+#include "mem/bus/pio_interface_impl.hh"
 #include "mem/functional_mem/memory_control.hh"
 #include "sim/builder.hh"
 #include "sim/system.hh"
@@ -50,14 +53,21 @@
 
 using namespace std;
 
-AlphaConsole::AlphaConsole(const string &name, SimConsole *cons,
-                           SimpleDisk *d, System *system,
-                           BaseCPU *cpu, TsunamiIO *clock, int num_cpus,
-                           Addr a, MemoryController *mmu)
-    : FunctionalMemory(name), disk(d), console(cons), addr(a)
+AlphaConsole::AlphaConsole(const string &name, SimConsole *cons, SimpleDisk *d,
+                           System *system, BaseCPU *cpu, TsunamiIO *clock,
+                           int num_cpus, MemoryController *mmu, Addr a,
+                           HierParams *hier, Bus *bus)
+    : PioDevice(name), disk(d), console(cons), addr(a)
+>>>>>>>
 {
     mmu->add_child(this, Range<Addr>(addr, addr + size));
 
+    if (bus) {
+        pioInterface = newPioInterface(name, hier, bus, this,
+                                       &AlphaConsole::cacheAccess);
+        pioInterface->addAddrRange(addr, addr + size);
+    }
+
     consoleData = new uint8_t[size];
     memset(consoleData, 0, size);
 
@@ -185,6 +195,12 @@ AlphaConsole::write(MemReqPtr &req, const uint8_t *data)
     return No_Fault;
 }
 
+Tick
+AlphaConsole::cacheAccess(MemReqPtr &req)
+{
+    return curTick + 1000;
+}
+
 void
 AlphaAccess::serialize(ostream &os)
 {
@@ -253,6 +269,8 @@ BEGIN_DECLARE_SIM_OBJECT_PARAMS(AlphaConsole)
     SimObjectParam<System *> system;
     SimObjectParam<BaseCPU *> cpu;
     SimObjectParam<TsunamiIO *> clock;
+    SimObjectParam<Bus*> io_bus;
+    SimObjectParam<HierParams *> hier;
 
 END_DECLARE_SIM_OBJECT_PARAMS(AlphaConsole)
 
@@ -265,14 +283,17 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(AlphaConsole)
     INIT_PARAM(addr, "Device Address"),
     INIT_PARAM(system, "system object"),
     INIT_PARAM(cpu, "Processor"),
-    INIT_PARAM(clock, "Turbolaser Clock")
+    INIT_PARAM(clock, "Turbolaser Clock"),
+    INIT_PARAM_DFLT(io_bus, "The IO Bus to attach to", NULL),
+    INIT_PARAM_DFLT(hier, "Hierarchy global variables", &defaultHierParams)
 
 END_INIT_SIM_OBJECT_PARAMS(AlphaConsole)
 
 CREATE_SIM_OBJECT(AlphaConsole)
 {
-    return  new AlphaConsole(getInstanceName(), sim_console, disk,
-                             system, cpu, clock, num_cpus, addr, mmu);
+    return new AlphaConsole(getInstanceName(), sim_console, disk,
+                            system, cpu, clock, num_cpus, mmu,
+                            addr, hier, io_bus);
 }
 
 REGISTER_SIM_OBJECT("AlphaConsole", AlphaConsole)
diff --git a/dev/alpha_console.hh b/dev/alpha_console.hh
index d0fa552af..be8538e50 100644
--- a/dev/alpha_console.hh
+++ b/dev/alpha_console.hh
@@ -35,7 +35,7 @@
 
 #include "base/range.hh"
 #include "dev/alpha_access.h"
-#include "mem/functional_mem/functional_memory.hh"
+#include "dev/io_device.hh"
 #include "sim/host.hh"
 #include "dev/tsunami_io.hh"
 
@@ -70,7 +70,7 @@ class SimpleDisk;
  * primarily used doing boot before the kernel has loaded its device
  * drivers.
  */
-class AlphaConsole : public FunctionalMemory
+class AlphaConsole : public PioDevice
 {
   protected:
     union {
@@ -89,10 +89,10 @@ class AlphaConsole : public FunctionalMemory
 
   public:
     /** Standard Constructor */
-    AlphaConsole(const std::string &name, SimConsole *cons,
-                 SimpleDisk *d, System *system, BaseCPU *cpu,
-                 TsunamiIO *clock, int num_cpus,
-                 Addr a, MemoryController *mmu);
+    AlphaConsole(const std::string &name, SimConsole *cons, SimpleDisk *d,
+                 System *system, BaseCPU *cpu, TsunamiIO *clock,
+                 int num_cpus, MemoryController *mmu, Addr addr,
+                 HierParams *hier, Bus *bus);
 
     /**
      * memory mapped reads and writes
@@ -105,6 +105,9 @@ class AlphaConsole : public FunctionalMemory
      */
     virtual void serialize(std::ostream &os);
     virtual void unserialize(Checkpoint *cp, const std::string &section);
+
+  public:
+    Tick cacheAccess(MemReqPtr &req);
 };
 
 #endif // __ALPHA_CONSOLE_HH__
diff --git a/dev/etherdump.cc b/dev/etherdump.cc
index 6d86adc32..b6d6bbe30 100644
--- a/dev/etherdump.cc
+++ b/dev/etherdump.cc
@@ -34,6 +34,7 @@
 
 #include <string>
 
+#include "base/misc.hh"
 #include "dev/etherdump.hh"
 #include "sim/builder.hh"
 #include "sim/universe.hh"
@@ -43,11 +44,8 @@ using std::string;
 EtherDump::EtherDump(const string &name, const string &file)
     : SimObject(name)
 {
-    if (!file.empty()) {
+    if (!file.empty())
         stream.open(file.c_str());
-        if (stream.is_open())
-            init();
-    }
 }
 
 #define DLT_EN10MB		1       	// Ethernet (10Mb)
@@ -66,7 +64,8 @@ struct pcap_file_header {
 };
 
 struct pcap_pkthdr {
-    struct timeval ts;		// time stamp
+    uint32_t seconds;
+    uint32_t microseconds;
     uint32_t caplen;		// length of portion present
     uint32_t len;		// length this packet (off wire)
 };
@@ -74,6 +73,9 @@ struct pcap_pkthdr {
 void
 EtherDump::init()
 {
+    if (!stream.is_open())
+        return;
+
     curtime = time(NULL);
     s_freq = ticksPerSecond;
     us_freq = ticksPerSecond / ULL(1000000);
@@ -96,8 +98,8 @@ EtherDump::init()
      * to sim_cycles.
      */
     pcap_pkthdr pkthdr;
-    pkthdr.ts.tv_sec = curtime;
-    pkthdr.ts.tv_usec = 0;
+    pkthdr.seconds = curtime;
+    pkthdr.microseconds = 0;
     pkthdr.caplen = 0;
     pkthdr.len = 0;
     stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr));
@@ -109,8 +111,8 @@ void
 EtherDump::dumpPacket(PacketPtr &packet)
 {
     pcap_pkthdr pkthdr;
-    pkthdr.ts.tv_sec = curtime + (curTick / s_freq);
-    pkthdr.ts.tv_usec = (curTick / us_freq) % ULL(1000000);
+    pkthdr.seconds = curtime + (curTick / s_freq);
+    pkthdr.microseconds = (curTick / us_freq) % ULL(1000000);
     pkthdr.caplen = packet->length;
     pkthdr.len = packet->length;
     stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr));
diff --git a/dev/etherlink.cc b/dev/etherlink.cc
index 676b1da1c..25991f1a7 100644
--- a/dev/etherlink.cc
+++ b/dev/etherlink.cc
@@ -42,17 +42,19 @@
 #include "dev/etherpkt.hh"
 #include "sim/builder.hh"
 #include "sim/universe.hh"
+#include "sim/system.hh"
 
 using namespace std;
 
-EtherLink::EtherLink(const std::string &name, EtherInt *i1, EtherInt *i2,
-                     Tick speed, EtherDump *dump)
+EtherLink::EtherLink(const string &name, EtherInt *i1, EtherInt *i2,
+                     Tick speed, Tick dly, EtherDump *dump)
     : SimObject(name)
 {
     double rate = ((double)ticksPerSecond * 8.0) / (double)speed;
+    Tick delay = US2Ticks(dly);
 
-    link1 = new Link(name + ".link1", rate, dump);
-    link2 = new Link(name + ".link2", rate, dump);
+    link1 = new Link(name + ".link1", rate, delay, dump);
+    link2 = new Link(name + ".link2", rate, delay, dump);
 
     int1 = new Interface(name + ".int1", link1, link2);
     int2 = new Interface(name + ".int2", link2, link1);
@@ -72,28 +74,76 @@ EtherLink::~EtherLink()
     delete int2;
 }
 
-EtherLink::Interface::Interface(const std::string &name, Link *tx, Link *rx)
+EtherLink::Interface::Interface(const string &name, Link *tx, Link *rx)
     : EtherInt(name), txlink(tx)
 {
     tx->setTxInt(this);
     rx->setRxInt(this);
 }
 
-EtherLink::Link::Link(const std::string &name, double rate, EtherDump *d)
-    : objName(name), txint(NULL), rxint(NULL), ticks_per_byte(rate),
-      dump(d), event(&mainEventQueue, this)
+EtherLink::Link::Link(const string &name, double rate, Tick delay,
+                      EtherDump *d)
+    : objName(name), txint(NULL), rxint(NULL), ticksPerByte(rate),
+      linkDelay(delay), dump(d), doneEvent(this)
 {}
 
 void
+EtherLink::serialize(ostream &os)
+{
+    nameOut(os, name() + ".link1");
+    link1->serialize(os);
+    nameOut(os, name() + ".link2");
+    link2->serialize(os);
+}
+
+void
+EtherLink::unserialize(Checkpoint *cp, const string &section)
+{
+    link1->unserialize(cp, section + ".link1");
+    link2->unserialize(cp, section + ".link2");
+}
+
+void
+EtherLink::Link::txComplete(PacketPtr &packet)
+{
+    DPRINTF(Ethernet, "packet received: len=%d\n", packet->length);
+    DDUMP(EthernetData, packet->data, packet->length);
+    rxint->sendPacket(packet);
+}
+
+class LinkDelayEvent : public Event
+{
+  protected:
+    EtherLink::Link *link;
+    PacketPtr packet;
+
+    // non-scheduling version for createForUnserialize()
+    LinkDelayEvent(EtherLink::Link *link);
+
+  public:
+    LinkDelayEvent(EtherLink::Link *link, PacketPtr &pkt, Tick when);
+
+    void process();
+
+    virtual void serialize(ostream &os);
+    virtual void unserialize(Checkpoint *cp, const string &section);
+    static Serializable *createForUnserialize(Checkpoint *cp,
+                                              const string &section);
+};
+
+
+void
 EtherLink::Link::txDone()
 {
     if (dump)
         dump->dump(packet);
 
-    DPRINTF(Ethernet, "EtherLink packet received: len=%d\n", packet->length);
-    DDUMP(EthernetData, packet->data, packet->length);
-
-    rxint->sendPacket(packet);
+    if (linkDelay > 0) {
+        DPRINTF(Ethernet, "packet delayed: delay=%d\n", linkDelay);
+        new LinkDelayEvent(this, packet, curTick + linkDelay);
+    } else {
+        txComplete(packet);
+    }
 
     packet = 0;
     assert(!busy());
@@ -105,27 +155,118 @@ bool
 EtherLink::Link::transmit(PacketPtr &pkt)
 {
     if (busy()) {
-        DPRINTF(Ethernet, "EtherLink packet not sent, link busy\n");
+        DPRINTF(Ethernet, "packet not sent, link busy\n");
         return false;
     }
 
-    DPRINTF(Ethernet, "EtherLink packet sent: len=%d\n", pkt->length);
+    DPRINTF(Ethernet, "packet sent: len=%d\n", pkt->length);
     DDUMP(EthernetData, pkt->data, pkt->length);
 
     packet = pkt;
-    int delay = (int)ceil(((double)pkt->length * ticks_per_byte) + 1.0);
-    DPRINTF(Ethernet, "EtherLink scheduling packet: delay=%d, (rate=%f)\n",
-            delay, ticks_per_byte);
-    event.schedule(curTick + delay);
+    Tick delay = (Tick)ceil(((double)pkt->length * ticksPerByte) + 1.0);
+    DPRINTF(Ethernet, "scheduling packet: delay=%d, (rate=%f)\n",
+            delay, ticksPerByte);
+    doneEvent.schedule(curTick + delay);
 
     return true;
 }
 
+void
+EtherLink::Link::serialize(ostream &os)
+{
+    bool packet_exists = packet;
+    SERIALIZE_SCALAR(packet_exists);
+
+    bool event_scheduled = doneEvent.scheduled();
+    SERIALIZE_SCALAR(event_scheduled);
+    if (event_scheduled) {
+        Tick event_time = doneEvent.when();
+        SERIALIZE_SCALAR(event_time);
+    }
+
+    if (packet_exists) {
+        nameOut(os, csprintf("%s.packet", name()));
+        packet->serialize(os);
+    }
+}
+
+void
+EtherLink::Link::unserialize(Checkpoint *cp, const string &section)
+{
+    bool packet_exists;
+    UNSERIALIZE_SCALAR(packet_exists);
+    if (packet_exists) {
+        packet = new EtherPacket;
+        packet->unserialize(cp, csprintf("%s.packet", section));
+    }
+
+    bool event_scheduled;
+    UNSERIALIZE_SCALAR(event_scheduled);
+    if (event_scheduled) {
+        Tick event_time;
+        UNSERIALIZE_SCALAR(event_time);
+        doneEvent.schedule(event_time);
+    }
+}
+
+LinkDelayEvent::LinkDelayEvent(EtherLink::Link *l)
+    : Event(&mainEventQueue), link(l)
+{
+    setFlags(AutoSerialize);
+    setFlags(AutoDelete);
+}
+
+LinkDelayEvent::LinkDelayEvent(EtherLink::Link *l, PacketPtr &p, Tick when)
+    : Event(&mainEventQueue), link(l), packet(p)
+{
+    setFlags(AutoSerialize);
+    setFlags(AutoDelete);
+    schedule(when);
+}
+
+void
+LinkDelayEvent::process()
+{
+    link->txComplete(packet);
+}
+
+void
+LinkDelayEvent::serialize(ostream &os)
+{
+    paramOut(os, "type", string("LinkDelayEvent"));
+    Event::serialize(os);
+    SERIALIZE_OBJPTR(link);
+
+    nameOut(os, csprintf("%s.packet", name()));
+    packet->serialize(os);
+}
+
+
+void
+LinkDelayEvent::unserialize(Checkpoint *cp, const string &section)
+{
+    Event::unserialize(cp, section);
+    packet = new EtherPacket;
+    packet->unserialize(cp, csprintf("%s.packet", section));
+}
+
+
+Serializable *
+LinkDelayEvent::createForUnserialize(Checkpoint *cp, const string &section)
+{
+    EtherLink::Link *link;
+    UNSERIALIZE_OBJPTR(link);
+    return new LinkDelayEvent(link);
+}
+
+REGISTER_SERIALIZEABLE("LinkDelayEvent", LinkDelayEvent)
+
 BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherLink)
 
     SimObjectParam<EtherInt *> interface1;
     SimObjectParam<EtherInt *> interface2;
     Param<Tick> link_speed;
+    Param<Tick> link_delay;
     SimObjectParam<EtherDump *> packet_dump;
 
 END_DECLARE_SIM_OBJECT_PARAMS(EtherLink)
@@ -135,6 +276,7 @@ BEGIN_INIT_SIM_OBJECT_PARAMS(EtherLink)
     INIT_PARAM(interface1, "interface 1"),
     INIT_PARAM(interface2, "interface 2"),
     INIT_PARAM_DFLT(link_speed, "link speed in bits per second", 100000000),
+    INIT_PARAM_DFLT(link_delay, "transmit delay of packets in us", 0),
     INIT_PARAM_DFLT(packet_dump, "object to dump network packets to", NULL)
 
 END_INIT_SIM_OBJECT_PARAMS(EtherLink)
@@ -142,7 +284,7 @@ END_INIT_SIM_OBJECT_PARAMS(EtherLink)
 CREATE_SIM_OBJECT(EtherLink)
 {
     return new EtherLink(getInstanceName(), interface1, interface2, link_speed,
-                         packet_dump);
+                         link_delay, packet_dump);
 }
 
 REGISTER_SIM_OBJECT("EtherLink", EtherLink)
diff --git a/dev/etherlink.hh b/dev/etherlink.hh
index e1a7957ee..3b1dd21bc 100644
--- a/dev/etherlink.hh
+++ b/dev/etherlink.hh
@@ -49,6 +49,7 @@ class EtherLink : public SimObject
   protected:
     class Interface;
 
+    friend class LinkDelayEvent;
      /*
       * Model for a single uni-directional link
       */
@@ -59,34 +60,26 @@ class EtherLink : public SimObject
         Interface *txint;
         Interface *rxint;
 
-        double ticks_per_byte;
+        double ticksPerByte;
+        Tick linkDelay;
         EtherDump *dump;
 
       protected:
         /*
          * Transfer is complete
          */
-        class DoneEvent : public Event
-        {
-          protected:
-            Link *link;
-
-          public:
-            DoneEvent(EventQueue *q, Link *l)
-                : Event(q), link(l) {}
-            virtual void process() { link->txDone(); }
-            virtual const char *description()
-                { return "ethernet link completion"; }
-        };
-
-        friend class DoneEvent;
-        DoneEvent event;
         PacketPtr packet;
-
         void txDone();
+        typedef EventWrapper<Link, &Link::txDone> DoneEvent;
+        friend class DoneEvent;
+        DoneEvent doneEvent;
+
+        friend class LinkDelayEvent;
+        void txComplete(PacketPtr &packet);
 
       public:
-        Link(const std::string &name, double rate, EtherDump *dump);
+        Link(const std::string &name, double rate, Tick delay,
+             EtherDump *dump);
         ~Link() {}
 
         virtual const std::string name() const { return objName; }
@@ -96,6 +89,9 @@ class EtherLink : public SimObject
 
         void setTxInt(Interface *i) { assert(!txint); txint = i; }
         void setRxInt(Interface *i) { assert(!rxint); rxint = i; }
+
+        virtual void serialize(std::ostream &os);
+        virtual void unserialize(Checkpoint *cp, const std::string &section);
     };
 
     /*
@@ -120,8 +116,12 @@ class EtherLink : public SimObject
 
   public:
     EtherLink(const std::string &name, EtherInt *i1, EtherInt *i2,
-              Tick speed, EtherDump *dump);
+              Tick speed, Tick delay, EtherDump *dump);
     virtual ~EtherLink();
+
+    virtual void serialize(std::ostream &os);
+    virtual void unserialize(Checkpoint *cp, const std::string &section);
+
 };
 
 #endif // __ETHERLINK_HH__
diff --git a/dev/etherpkt.cc b/dev/etherpkt.cc
new file mode 100644
index 000000000..cb6087c89
--- /dev/null
+++ b/dev/etherpkt.cc
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2004 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.
+ */
+
+#include <iostream>
+
+#include "dev/etherpkt.hh"
+#include "sim/serialize.hh"
+
+using namespace std;
+
+void
+EtherPacket::serialize(ostream &os)
+{
+    SERIALIZE_SCALAR(length);
+    SERIALIZE_ARRAY(data, length);
+}
+
+void
+EtherPacket::unserialize(Checkpoint *cp, const std::string &section)
+{
+    UNSERIALIZE_SCALAR(length);
+    data = new uint8_t[length];
+    UNSERIALIZE_ARRAY(data, length);
+}
+
diff --git a/dev/etherpkt.hh b/dev/etherpkt.hh
index c91322526..27ac526d6 100644
--- a/dev/etherpkt.hh
+++ b/dev/etherpkt.hh
@@ -33,10 +33,10 @@
 #ifndef __ETHERPKT_HH__
 #define __ETHERPKT_HH__
 
+#include <iosfwd>
 #include <memory>
 
 #include "sim/host.hh"
-
 #include "base/refcnt.hh"
 
 class Checkpoint;
diff --git a/dev/io_device.cc b/dev/io_device.cc
new file mode 100644
index 000000000..4f53ba48d
--- /dev/null
+++ b/dev/io_device.cc
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2003 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.
+ */
+
+#include "dev/io_device.hh"
+#include "mem/bus/base_interface.hh"
+#include "mem/bus/dma_interface.hh"
+
+PioDevice::PioDevice(const std::string &name)
+    : FunctionalMemory(name), pioInterface(NULL)
+{}
+
+PioDevice::~PioDevice()
+{
+    if (pioInterface)
+        delete pioInterface;
+}
+
+DmaDevice::DmaDevice(const std::string &name)
+    : PioDevice(name), dmaInterface(NULL)
+{}
+
+DmaDevice::~DmaDevice()
+{
+    if (dmaInterface)
+        delete dmaInterface;
+}
+
diff --git a/dev/io_device.hh b/dev/io_device.hh
new file mode 100644
index 000000000..9300d87e7
--- /dev/null
+++ b/dev/io_device.hh
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2003 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.
+ */
+
+#ifndef __IO_DEVICE_HH__
+#define __IO_DEVICE_HH__
+
+#include "mem/functional_mem/functional_memory.hh"
+
+class BaseInterface;
+class Bus;
+class HierParams;
+template <class Bus> class DMAInterface;
+
+class PioDevice : public FunctionalMemory
+{
+  protected:
+    BaseInterface *pioInterface;
+
+  public:
+    PioDevice(const std::string &name);
+    virtual ~PioDevice();
+};
+
+class DmaDevice : public PioDevice
+{
+  protected:
+    DMAInterface<Bus> *dmaInterface;
+
+  public:
+    DmaDevice(const std::string &name);
+    virtual ~DmaDevice();
+};
+
+#endif // __IO_DEVICE_HH__