24 files changed, 751 insertions, 147 deletions

diff --git a/arch/alpha/isa_desc b/arch/alpha/isa_desc
index 6c2888685..e3b8cf01b 100644
--- a/arch/alpha/isa_desc
+++ b/arch/alpha/isa_desc
@@ -28,10 +28,11 @@ let {{
 #include "cpu/simple_cpu/simple_cpu.hh"
 #include "cpu/static_inst.hh"
 #include "sim/annotation.hh"
-#include "sim/sim_events.hh"
+#include "sim/sim_exit.hh"
 
 #ifdef FULL_SYSTEM
-#include "targetarch/ev5.hh"
+#include "arch/alpha/ev5.hh"
+#include "arch/alpha/pseudo_inst.hh"
 #endif
 
 namespace AlphaISA;
@@ -2372,7 +2373,7 @@ decode OPCODE default Unknown::unknown() {
 	format EmulatedCallPal {
 	    0x00: halt ({{
 		if (!xc->misspeculating()) 
-		    SimExit("halt instruction encountered");
+		    SimExit(curTick, "halt instruction encountered");
 	    }});
 	    0x83: callsys({{ 
 		if (!xc->misspeculating()) 
@@ -2417,11 +2418,8 @@ decode OPCODE default Unknown::unknown() {
 		}
 	    }});
 	    0x01: quiesce({{
-		if (!xc->misspeculating()) {
-		    Annotate::QUIESCE(xc);
-		    xc->setStatus(ExecContext::Suspended);
-		    xc->kernelStats.quiesce();
-		}
+		if (!xc->misspeculating())
+		    AlphaPseudo::quiesce(xc);
 	    }});
 	    0x10: ivlb({{
 		if (!xc->misspeculating()) {
@@ -2433,14 +2431,30 @@ decode OPCODE default Unknown::unknown() {
 		if (!xc->misspeculating())
 		    Annotate::EndInterval(xc);
 	    }}, No_OpClass);
-	    0x20: m5exit({{
+	    0x20: m5exit_old({{
 		if (!xc->misspeculating())
-		    SimExit("m5_exit instruction encountered");
+		    AlphaPseudo::m5exit_old(xc);
+	    }}, No_OpClass);
+	    0x21: m5exit({{
+		if (!xc->misspeculating())
+		    AlphaPseudo::m5exit(xc);
 	    }}, No_OpClass);
             0x30: initparam({{ Ra = xc->cpu->system->init_param; }});
             0x40: resetstats({{
 		if (!xc->misspeculating())
-		    Statistics::reset();
+		    AlphaPseudo::resetstats(xc);
+	    }});
+            0x41: dumpstats({{
+		if (!xc->misspeculating())
+		    AlphaPseudo::dumpstats(xc);
+	    }});
+            0x42: dumpresetstats({{
+		if (!xc->misspeculating())
+		    AlphaPseudo::dumpresetstats(xc);
+	    }});
+            0x43: m5checkpoint({{
+		if (!xc->misspeculating())
+		    AlphaPseudo::m5checkpoint(xc);
 	    }});
 	}
     }
diff --git a/arch/alpha/pseudo_inst.cc b/arch/alpha/pseudo_inst.cc
new file mode 100644
index 000000000..c62de3ce6
--- /dev/null
+++ b/arch/alpha/pseudo_inst.cc
@@ -0,0 +1,159 @@
+/*
+ * 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 <string>
+
+#include "arch/alpha/pseudo_inst.hh"
+#include "cpu/exec_context.hh"
+#include "sim/annotation.hh"
+#include "sim/param.hh"
+#include "sim/serialize.hh"
+#include "sim/sim_exit.hh"
+#include "sim/sim_stats.hh"
+
+using namespace std;
+using namespace Statistics;
+
+namespace AlphaPseudo
+{
+    bool doStatisticsInsts;
+    bool doCheckpointInsts;
+    bool doQuiesce;
+
+    void
+    quiesce(ExecContext *xc)
+    {
+        if (!doQuiesce)
+            return;
+
+        Annotate::QUIESCE(xc);
+        xc->setStatus(ExecContext::Suspended);
+        xc->kernelStats.quiesce();
+    }
+
+    void
+    m5exit_old(ExecContext *xc)
+    {
+        SimExit(curTick, "m5_exit_old instruction encountered");
+    }
+
+    void
+    m5exit(ExecContext *xc)
+    {
+        Tick delay = xc->regs.intRegFile[16];
+        Tick when = curTick + NS2Ticks(delay);
+        SimExit(when, "m5_exit instruction encountered");
+    }
+
+    void
+    resetstats(ExecContext *xc)
+    {
+        if (!doStatisticsInsts)
+            return;
+
+        Tick delay = xc->regs.intRegFile[16];
+        Tick period = xc->regs.intRegFile[17];
+
+        Tick when = curTick + NS2Ticks(delay);
+        Tick repeat = NS2Ticks(period);
+
+        SetupEvent(Reset, when, repeat);
+    }
+
+    void
+    dumpstats(ExecContext *xc)
+    {
+        if (!doStatisticsInsts)
+            return;
+
+        Tick delay = xc->regs.intRegFile[16];
+        Tick period = xc->regs.intRegFile[17];
+
+        Tick when = curTick + NS2Ticks(delay);
+        Tick repeat = NS2Ticks(period);
+
+        SetupEvent(Dump, when, repeat);
+    }
+
+    void
+    dumpresetstats(ExecContext *xc)
+    {
+        if (!doStatisticsInsts)
+            return;
+
+        Tick delay = xc->regs.intRegFile[16];
+        Tick period = xc->regs.intRegFile[17];
+
+        Tick when = curTick + NS2Ticks(delay);
+        Tick repeat = NS2Ticks(period);
+
+        SetupEvent(Dump|Reset, when, repeat);
+    }
+
+    void
+    m5checkpoint(ExecContext *xc)
+    {
+        if (!doCheckpointInsts)
+            return;
+
+        Tick delay = xc->regs.intRegFile[16];
+        Tick period = xc->regs.intRegFile[17];
+
+        Tick when = curTick + NS2Ticks(delay);
+        Tick repeat = NS2Ticks(period);
+
+        SetupCheckpoint(when, repeat);
+    }
+
+    class Context : public ParamContext
+    {
+      public:
+        Context(const string &section) : ParamContext(section) {}
+        void checkParams();
+    };
+
+    Context context("PseudoInsts");
+
+    Param<bool> __quiesce(&context, "quiesce",
+                          "enable quiesce instructions",
+                          true);
+    Param<bool> __statistics(&context, "statistics",
+                             "enable statistics pseudo instructions",
+                             true);
+    Param<bool> __checkpoint(&context, "checkpoint",
+                             "enable checkpoint pseudo instructions",
+                             true);
+
+    void
+    Context::checkParams()
+    {
+        doQuiesce = __quiesce;
+        doStatisticsInsts = __statistics;
+        doCheckpointInsts = __checkpoint;
+    }
+}
diff --git a/arch/alpha/pseudo_inst.hh b/arch/alpha/pseudo_inst.hh
new file mode 100644
index 000000000..60031f8cd
--- /dev/null
+++ b/arch/alpha/pseudo_inst.hh
@@ -0,0 +1,40 @@
+/*
+ * 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.
+ */
+
+class ExecContext;
+
+namespace AlphaPseudo
+{
+    void quiesce(ExecContext *xc);
+    void m5exit(ExecContext *xc);
+    void m5exit_old(ExecContext *xc);
+    void resetstats(ExecContext *xc);
+    void dumpstats(ExecContext *xc);
+    void dumpresetstats(ExecContext *xc);
+    void m5checkpoint(ExecContext *xc);
+}
diff --git a/base/inifile.cc b/base/inifile.cc
index 7e7485bcb..2717a534d 100644
--- a/base/inifile.cc
+++ b/base/inifile.cc
@@ -402,6 +402,14 @@ IniFile::findAppend(const string &_section, const string &entry,
     return ret;
 }
 
+
+bool
+IniFile::sectionExists(const string &sectionName) const
+{
+    return findSection(sectionName) != NULL;
+}
+
+
 bool
 IniFile::Section::printUnreferenced(const string &sectionName)
 {
diff --git a/base/inifile.hh b/base/inifile.hh
index f67fdc7be..f7229f2f2 100644
--- a/base/inifile.hh
+++ b/base/inifile.hh
@@ -208,6 +208,13 @@ class IniFile
     bool findAppend(const std::string &section, const std::string &entry,
                     std::string &value) const;
 
+    /// Determine whether the named section exists in the .ini file.
+    /// Note that the 'Section' class is (intentionally) not public,
+    /// so all clients can do is get a bool that says whether there
+    /// are any values in that section or not.
+    /// @return True if the section exists.
+    bool sectionExists(const std::string &section) const;
+
     /// Print unreferenced entries in object.  Iteratively calls
     /// printUnreferend() on all the constituent sections.
     bool printUnreferenced();
diff --git a/base/statistics.cc b/base/statistics.cc
index 8b2d8e5de..c1a5b2626 100644
--- a/base/statistics.cc
+++ b/base/statistics.cc
@@ -919,7 +919,7 @@ dump(ostream &stream)
 CallbackQueue resetQueue;
 
 void
-regReset(Callback *cb)
+RegResetCallback(Callback *cb)
 {
     resetQueue.add(cb);
 }
diff --git a/base/statistics.hh b/base/statistics.hh
index 056adea57..2fe6988b0 100644
--- a/base/statistics.hh
+++ b/base/statistics.hh
@@ -2277,6 +2277,7 @@ struct StatBin : public GenBin
         int _size;
 
       public:
+        enum { binned = true };
         VectorBin() : _size(0) {}
 
         bool initialized() const { return _size > 0; }
@@ -2762,7 +2763,7 @@ class Formula : public Detail::VectorStat
 void check();
 void dump(std::ostream &stream);
 void reset();
-void regReset(Callback *cb);
+void RegResetCallback(Callback *cb);
 
 inline Detail::Temp
 operator+(Detail::Temp l, Detail::Temp r)
diff --git a/cpu/intr_control.cc b/cpu/intr_control.cc
index 037b00ef4..c71a36b6f 100644
--- a/cpu/intr_control.cc
+++ b/cpu/intr_control.cc
@@ -40,6 +40,42 @@ IntrControl::IntrControl(const string &name, BaseCPU *c)
     : SimObject(name), cpu(c)
 {}
 
+/* @todo
+ *Fix the cpu sim object parameter to be a system pointer
+ *instead, to avoid some extra dereferencing
+ */
+void
+IntrControl::post(int int_num, int index)
+{
+    std::vector<ExecContext *> &xcvec = cpu->system->execContexts;
+    BaseCPU *temp = xcvec[0]->cpu;
+    temp->post_interrupt(int_num, index);
+}
+
+void
+IntrControl::post(int cpu_id, int int_num, int index)
+{
+    std::vector<ExecContext *> &xcvec = cpu->system->execContexts;
+    BaseCPU *temp = xcvec[cpu_id]->cpu;
+    temp->post_interrupt(int_num, index);
+}
+
+void
+IntrControl::clear(int int_num, int index)
+{
+    std::vector<ExecContext *> &xcvec = cpu->system->execContexts;
+    BaseCPU *temp = xcvec[0]->cpu;
+    temp->clear_interrupt(int_num, index);
+}
+
+void
+IntrControl::clear(int cpu_id, int int_num, int index)
+{
+    std::vector<ExecContext *> &xcvec = cpu->system->execContexts;
+    BaseCPU *temp = xcvec[cpu_id]->cpu;
+    temp->clear_interrupt(int_num, index);
+}
+
 BEGIN_DECLARE_SIM_OBJECT_PARAMS(IntrControl)
 
     SimObjectParam<BaseCPU *> cpu;
@@ -48,7 +84,7 @@ END_DECLARE_SIM_OBJECT_PARAMS(IntrControl)
 
 BEGIN_INIT_SIM_OBJECT_PARAMS(IntrControl)
 
-    INIT_PARAM(cpu, "the processor")
+    INIT_PARAM(cpu, "the cpu")
 
 END_INIT_SIM_OBJECT_PARAMS(IntrControl)
 
diff --git a/cpu/intr_control.hh b/cpu/intr_control.hh
index b8fa68f52..37e62ed00 100644
--- a/cpu/intr_control.hh
+++ b/cpu/intr_control.hh
@@ -29,9 +29,13 @@
 #ifndef __INTR_CONTROL_HH__
 #define __INTR_CONTROL_HH__
 
+#include <vector>
 #include "base/misc.hh"
 #include "cpu/base_cpu.hh"
 #include "sim/sim_object.hh"
+#include "sim/system.hh"
+#include "cpu/exec_context.hh"
+
 
 class IntrControl : public SimObject
 {
@@ -41,16 +45,10 @@ class IntrControl : public SimObject
 
     void clear(int int_num, int index = 0);
     void post(int int_num, int index = 0);
+    void clear(int cpu_id, int int_num, int index);
+    void post(int cpu_id, int int_num, int index);
 };
 
-inline void
-IntrControl::post(int int_num, int index)
-{ cpu->post_interrupt(int_num, index); }
-
-inline void
-IntrControl::clear(int int_num, int index)
-{ cpu->clear_interrupt(int_num, index); }
-
 #endif // __INTR_CONTROL_HH__
 
 
diff --git a/dev/disk_image.cc b/dev/disk_image.cc
index 2fead00ad..a1a220de1 100644
--- a/dev/disk_image.cc
+++ b/dev/disk_image.cc
@@ -405,7 +405,7 @@ CowDiskImage::write(const uint8_t *data, off_t offset)
 void
 CowDiskImage::serialize(ostream &os)
 {
-    string cowFilename = serializeFilename + ".cow";
+    string cowFilename = CheckpointFile() + "." + name() + ".cow";
     SERIALIZE_SCALAR(cowFilename);
     save(cowFilename);
 }
diff --git a/sim/debug.cc b/sim/debug.cc
index b18642942..95187baff 100644
--- a/sim/debug.cc
+++ b/sim/debug.cc
@@ -125,11 +125,6 @@ extern "C" void sched_break_cycle(Tick when)
     new DebugBreakEvent(&mainEventQueue, when);
 }
 
-extern "C" void dump_stats()
-{
-    new DumpStatsEvent();
-}
-
 extern "C" void eventq_dump()
 {
     mainEventQueue.dump();
diff --git a/sim/eventq.cc b/sim/eventq.cc
index fda587dcb..52f7dfaff 100644
--- a/sim/eventq.cc
+++ b/sim/eventq.cc
@@ -112,7 +112,7 @@ EventQueue::serviceOne()
     else
         event->clearFlags(Event::Squashed);
 
-    if (event->getFlags(Event::AutoDelete))
+    if (event->getFlags(Event::AutoDelete) && !event->scheduled())
         delete event;
 }
 
diff --git a/sim/main.cc b/sim/main.cc
index ce9ef5819..addedbc85 100644
--- a/sim/main.cc
+++ b/sim/main.cc
@@ -400,7 +400,9 @@ main(int argc, char **argv)
             async_event = false;
             if (async_dump) {
                 async_dump = false;
-                new DumpStatsEvent();
+
+                using namespace Statistics;
+                SetupEvent(Dump, curTick);
             }
 
             if (async_exit) {
diff --git a/sim/serialize.cc b/sim/serialize.cc
index 84d400e16..0eb26c31d 100644
--- a/sim/serialize.cc
+++ b/sim/serialize.cc
@@ -245,14 +245,14 @@ Serializer::add_objects()
 }
 
 void
-Serializer::serialize(const string &f)
+Serializer::serialize()
 {
     if (Serializeable::serializer != NULL)
         panic("in process of serializing!");
 
     Serializeable::serializer = this;
 
-    file = f;
+    file = CheckpointFile();
     string cpt_file = file + ".cpt";
     output = new ofstream(cpt_file.c_str());
     time_t t = time(NULL);
@@ -286,38 +286,49 @@ class SerializeEvent : public Event
 {
   protected:
     string file;
+    Tick repeat;
 
   public:
-    SerializeEvent(EventQueue *q, Tick when, const string &file);
-    ~SerializeEvent();
-
+    SerializeEvent(Tick _when, Tick _repeat);
     virtual void process();
-    virtual void serialize(std::ostream &os);
+    virtual void serialize(std::ostream &os)
+    {
+        panic("Cannot serialize the SerializeEvent");
+    }
+
 };
 
-SerializeEvent::SerializeEvent(EventQueue *q, Tick when, const string &f)
-    : Event(q), file(f)
+SerializeEvent::SerializeEvent(Tick _when, Tick _repeat)
+    : Event(&mainEventQueue, 990), repeat(_repeat)
 {
     setFlags(AutoDelete);
-    schedule(when);
-}
-
-SerializeEvent::~SerializeEvent()
-{
+    schedule(_when);
 }
 
 void
 SerializeEvent::process()
 {
     Serializer serial;
-    serial.serialize(file);
-    new SimExitEvent("Serialization caused exit");
+    serial.serialize();
+    if (repeat)
+        schedule(curTick + repeat);
+}
+
+string __CheckpointFileBase;
+
+string
+CheckpointFile()
+{
+    if (__CheckpointFileBase.empty())
+        return __CheckpointFileBase;
+
+    return csprintf("%s.%d", __CheckpointFileBase, curTick);
 }
 
 void
-SerializeEvent::serialize(ostream &os)
+SetupCheckpoint(Tick when, Tick period)
 {
-    panic("Cannot serialize the SerializeEvent");
+    new SerializeEvent(when, period);
 }
 
 class SerializeParamContext : public ParamContext
@@ -333,18 +344,21 @@ class SerializeParamContext : public ParamContext
 
 SerializeParamContext serialParams("serialize");
 
+Param<string> serialize_file(&serialParams,
+                             "file",
+                             "file to write to", "m5");
+
 Param<Counter> serialize_cycle(&serialParams,
                                 "cycle",
                                 "cycle to serialize",
                                 0);
 
-Param<string> serialize_file(&serialParams,
-                             "file",
-                             "file to write to", "");
+Param<Counter> serialize_period(&serialParams,
+                                "period",
+                                "period to repeat serializations",
+                                0);
+
 
-// Copy filename into regular string so we can export it without
-// having to include param.hh all over the place.
-string serializeFilename;
 
 SerializeParamContext::SerializeParamContext(const string &section)
     : ParamContext(section), event(NULL)
@@ -357,22 +371,23 @@ SerializeParamContext::~SerializeParamContext()
 void
 SerializeParamContext::checkParams()
 {
-    serializeFilename = serialize_file;
-    if (!serializeFilename.empty() && serialize_cycle > 0)
-        event = new SerializeEvent(&mainEventQueue, serialize_cycle,
-                                   serializeFilename);
+    __CheckpointFileBase = serialize_file;
+    if (serialize_cycle > 0)
+        SetupCheckpoint(serialize_cycle, serialize_period);
 }
 
 void
-debug_serialize(const char *file)
+debug_serialize()
 {
     Serializer serial;
-    serial.serialize(file);
-    new SimExitEvent("Serialization caused exit");
+    serial.serialize();
 }
 
-
-
+void
+debug_serialize(Tick when)
+{
+    new SerializeEvent(when, 0);
+}
 
 ////////////////////////////////////////////////////////////////////////
 //
@@ -479,3 +494,10 @@ Checkpoint::findObj(const std::string &section, const std::string &entry,
 
     return false;
 }
+
+
+bool
+Checkpoint::sectionExists(const std::string &section)
+{
+    return db->sectionExists(section);
+}
diff --git a/sim/serialize.hh b/sim/serialize.hh
index a8fff7b6f..09e91d816 100644
--- a/sim/serialize.hh
+++ b/sim/serialize.hh
@@ -148,7 +148,7 @@ class Serializer
     void add_objects();
 
   public:
-    void serialize(const std::string &file);
+    void serialize();
     const std::string &filename() const { return file; }
 };
 
@@ -244,6 +244,8 @@ class Checkpoint
 
     bool findObj(const std::string &section, const std::string &entry,
                  Serializeable *&value);
+
+    bool sectionExists(const std::string &section);
 };
 
 
@@ -251,6 +253,7 @@ class Checkpoint
 // Export checkpoint filename param so other objects can derive
 // filenames from it (e.g., memory).
 //
-extern std::string serializeFilename;
+std::string CheckpointFile();
+void SetupCheckpoint(Tick when, Tick period = 0);
 
 #endif // __SERIALIZE_HH__
diff --git a/sim/sim_events.cc b/sim/sim_events.cc
index 5f24de516..98d3b086d 100644
--- a/sim/sim_events.cc
+++ b/sim/sim_events.cc
@@ -63,12 +63,6 @@ SimExitEvent::description()
     return "simulation termination";
 }
 
-void
-SimExit(const char *message)
-{
-    static SimExitEvent event(message);
-}
-
 //
 // constructor: automatically schedules at specified time
 //
@@ -103,20 +97,6 @@ CountedExitEvent::description()
     return "counted exit";
 }
 
-
-void
-DumpStatsEvent::process()
-{
-    dumpStats();
-}
-
-const char *
-DumpStatsEvent::description()
-{
-    return "stats dump";
-}
-
-
 #ifdef CHECK_SWAP_CYCLES
 new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
 #endif
@@ -148,33 +128,6 @@ CheckSwapEvent::description()
 }
 
 
-class DumpStatsContext : public ParamContext
-{
-  public:
-    DumpStatsContext(const string &_iniSection)
-        : ParamContext(_iniSection) {}
-    void checkParams();
-};
-
-DumpStatsContext dumpStatsParams("stats");
-
-VectorParam<Tick> dump_cycle(&dumpStatsParams, "dump_cycles",
-                               "cycles on which to dump stats");
-
-void
-DumpStatsContext::checkParams()
-{
-    if (dump_cycle.isValid()) {
-        vector<Tick> &cycles = dump_cycle;
-
-        vector<Tick>::iterator i = cycles.begin();
-        vector<Tick>::iterator end = cycles.end();
-
-        for (; i < end; ++i)
-            new DumpStatsEvent(*i);
-    }
-}
-
 ///////////////////////////////////////////////////
 //
 // Simulation termination parameters
diff --git a/sim/sim_events.hh b/sim/sim_events.hh
index 0029a8404..c4db248e0 100644
--- a/sim/sim_events.hh
+++ b/sim/sim_events.hh
@@ -66,8 +66,6 @@ class SimExitEvent : public Event
     virtual const char *description();
 };
 
-void SimExit(const char *message);
-
 //
 // Event class to terminate simulation after 'n' related events have
 // occurred using a shared counter: used to terminate when *all*
@@ -91,30 +89,6 @@ class CountedExitEvent : public Event
 //
 // Event to cause a statistics dump
 //
-class DumpStatsEvent : public Event
-{
-  public:
-    DumpStatsEvent()
-        : Event(&mainEventQueue)
-        { setFlags(AutoDelete); schedule(curTick, 999); }
-
-    DumpStatsEvent(EventQueue *q)
-        : Event(q)
-        { setFlags(AutoDelete); schedule(curTick, 999); }
-
-    DumpStatsEvent(Tick when)
-        : Event(&mainEventQueue)
-        { setFlags(AutoDelete); schedule(when, 999); }
-
-    DumpStatsEvent(EventQueue *q, Tick when)
-        : Event(q)
-        { setFlags(AutoDelete); schedule(when, 999); }
-
-    void process();
-
-    virtual const char *description();
-};
-
 class CheckSwapEvent : public Event
 {
   private:
diff --git a/sim/sim_exit.hh b/sim/sim_exit.hh
index 847d9eb10..9a8b22d51 100644
--- a/sim/sim_exit.hh
+++ b/sim/sim_exit.hh
@@ -31,11 +31,14 @@
 
 #include <string>
 
+#include "sim/host.hh"
+
 class Callback;
 
 void registerExitCallback(Callback *);
 
 void exitNow(const std::string &cause, int exit_code);
 void exitNow(const char *cause, int exit_code);
+void SimExit(Tick when, const char *message);
 
 #endif // __SIM_EXIT_HH__
diff --git a/sim/universe.cc b/sim/universe.cc
index 8274d84ca..b75b1f78a 100644
--- a/sim/universe.cc
+++ b/sim/universe.cc
@@ -38,6 +38,9 @@ using namespace std;
 
 Tick curTick = 0;
 Tick ticksPerSecond;
+double __ticksPerMS;
+double __ticksPerUS;
+double __ticksPerNS;
 
 class UniverseParamContext : public ParamContext
 {
@@ -49,10 +52,14 @@ class UniverseParamContext : public ParamContext
 UniverseParamContext universe("Universe");
 
 Param<Tick> universe_freq(&universe, "frequency", "tick frequency",
-                            200000000);
+                          200000000);
 
 void
 UniverseParamContext::checkParams()
 {
     ticksPerSecond = universe_freq;
+    double freq = double(ticksPerSecond);
+    __ticksPerMS = freq / 1.0e3;
+    __ticksPerUS = freq / 1.0e6;
+    __ticksPerNS = freq / 1.0e9;
 }
diff --git a/util/m5/Makefile b/util/m5/Makefile
new file mode 100644
index 000000000..6e4ad31a3
--- /dev/null
+++ b/util/m5/Makefile
@@ -0,0 +1,26 @@
+AS=as
+CC=cc
+LD=cc
+
+CCFLAGS=-O2
+#LDFLAGS=-non_shared
+
+all: m5
+
+m5: m5op.o m5.o
+	$(LD) $(LDFLAGS) -o $@ $>
+	strip $@
+
+clean:
+	@rm -f m5 *.o *.d *~ .#*
+
+.SUFFIXES:
+.SUFFIXES:.o .c .s
+
+# C Compilation
+.c.o:
+	$(CC) $(CCFLAGS) -o $@ -c $<
+
+# Assembly
+.s.o:
+	$(AS) $(ASFLAGS) -o $@ $<
diff --git a/util/m5/m5.c b/util/m5/m5.c
new file mode 100644
index 000000000..1271bc9e1
--- /dev/null
+++ b/util/m5/m5.c
@@ -0,0 +1,186 @@
+/*
+ * 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 <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "m5op.h"
+
+char *progname;
+
+void
+usage()
+{
+    printf("usage: m5 ivlb <interval>\n"
+           "       m5 ivle <interval>\n"
+           "       m5 initparam\n"
+           "       m5 sw99param\n"
+           "       m5 exit [delay]\n"
+           "       m5 resetstats [delay [period]]\n"
+           "       m5 dumpstats [delay [period]]\n"
+           "       m5 dumpresetstats [delay [period]]\n"
+           "       m5 checkpoint [delay [period]]\n"
+           "\n"
+           "All times in nanoseconds!\n");
+    exit(1);
+}
+
+#define COMPARE(X) (strcmp(X, command) == 0)
+
+int
+main(int argc, char *argv[])
+{
+    char *command;
+    uint64_t param;
+    uint64_t arg1 = 0;
+    uint64_t arg2 = 0;
+
+    progname = argv[0];
+    if (argc < 2)
+        usage();
+
+    command = argv[1];
+
+    if (COMPARE("ivlb")) {
+        if (argc != 3)
+            usage();
+
+        arg1 = strtoul(argv[2], NULL, 0);
+        ivlb(arg1);
+        return 0;
+    }
+
+    if (COMPARE("ivle")) {
+        if (argc != 3)
+            usage();
+
+        arg1 = strtoul(argv[2], NULL, 0);
+        ivle(arg1);
+        return 0;
+    }
+
+    if (COMPARE("initparam")) {
+        if (argc != 2)
+            usage();
+
+        printf("%ld", initparam());
+        return 0;
+    }
+
+    if (COMPARE("sw99param")) {
+        if (argc != 2)
+            usage();
+
+        param = initparam();
+        // run-time, rampup-time, rampdown-time, warmup-time, connections
+        printf("%d %d %d %d %d", (param >> 48) & 0xfff,
+               (param >> 36) & 0xfff, (param >> 24) & 0xfff,
+               (param >> 12) & 0xfff, (param >> 0) & 0xfff);
+
+        return 0;
+    }
+
+    if (COMPARE("exit")) {
+        switch (argc) {
+          case 3:
+            arg1 = strtoul(argv[2], NULL, 0);
+          case 2:
+            m5exit(arg1);
+            return 0;
+
+          default:
+            usage();
+        }
+    }
+
+    if (COMPARE("resetstats")) {
+        switch (argc) {
+          case 4:
+            arg2 = strtoul(argv[3], NULL, 0);
+          case 3:
+            arg1 = strtoul(argv[2], NULL, 0);
+          case 2:
+            reset_stats(arg1, arg2);
+            return 0;
+
+          default:
+            usage();
+        }
+    }
+
+    if (COMPARE("dumpstats")) {
+        switch (argc) {
+          case 4:
+            arg2 = strtoul(argv[3], NULL, 0);
+          case 3:
+            arg1 = strtoul(argv[2], NULL, 0);
+          case 2:
+            dump_stats(arg1, arg2);
+            return 0;
+
+          default:
+            usage();
+        }
+    }
+
+    if (COMPARE("dumpresetstats")) {
+        switch (argc) {
+          case 4:
+            arg2 = strtoul(argv[3], NULL, 0);
+          case 3:
+            arg1 = strtoul(argv[2], NULL, 0);
+          case 2:
+            dumpreset_stats(arg1, arg2);
+            return 0;
+
+          default:
+            usage();
+        }
+    }
+
+    if (COMPARE("checkpoint")) {
+        switch (argc) {
+          case 4:
+            arg2 = strtoul(argv[3], NULL, 0);
+          case 3:
+            arg1 = strtoul(argv[2], NULL, 0);
+          case 2:
+            checkpoint(arg1, arg2);
+            return 0;
+
+          default:
+            usage();
+        }
+
+        return 0;
+    }
+
+    usage();
+}
diff --git a/util/m5/m5op.h b/util/m5/m5op.h
new file mode 100644
index 000000000..266460ce9
--- /dev/null
+++ b/util/m5/m5op.h
@@ -0,0 +1,45 @@
+/*
+ * 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 __M5OP_H__
+#define __M5OP_H__
+
+#include <inttypes.h>
+
+void arm(uint64_t address);
+void quiesce();
+void ivlb(uint64_t interval);
+void ivle(uint64_t interval);
+void m5exit(uint64_t ns_delay);
+uint64_t initparam();
+void checkpoint(uint64_t ns_delay, uint64_t ns_period);
+void reset_stats(uint64_t ns_delay, uint64_t ns_period);
+void dump_stats(uint64_t ns_delay, uint64_t ns_period);
+void dumpreset_stats(uint64_t ns_delay, uint64_t ns_period);
+
+#endif // __M5OP_H__
diff --git a/util/m5/m5op.s b/util/m5/m5op.s
new file mode 100644
index 000000000..8004e66c6
--- /dev/null
+++ b/util/m5/m5op.s
@@ -0,0 +1,121 @@
+/*
+ * 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 <machine/asm.h>
+#include <regdef.h>
+		
+#define m5_op 0x01
+
+#define arm_func 0x00
+#define quiesce_func 0x01
+#define ivlb_func 0x10
+#define ivle_func 0x11
+#define exit_old_func 0x20 // deprectated!
+#define exit_func 0x21
+#define initparam_func 0x30
+#define resetstats_func 0x40
+#define dumpstats_func 0x41
+#define dumprststats_func 0x42
+#define ckpt_func 0x43
+	
+#define INST(op, ra, rb, func) \
+	.long (((op) << 26) | ((ra) << 21) | ((rb) << 16) | (func))
+	
+#define	ARM(reg) INST(m5_op, reg, 0, arm_func)
+#define QUIESCE() INST(m5_op, 0, 0, quiesce_func)
+#define IVLB(reg) INST(m5_op, reg, 0, ivlb_func)
+#define IVLE(reg) INST(m5_op, reg, 0, ivle_func)
+#define M5EXIT(reg) INST(m5_op, reg, 0, exit_func)
+#define INITPARAM(reg) INST(m5_op, reg, 0, initparam_func)
+#define RESET_STATS(r1, r2) INST(m5_op, r1, r2, resetstats_func)
+#define DUMP_STATS(r1, r2) INST(m5_op, r1, r2, dumpstats_func)
+#define DUMPRST_STATS(r1, r2) INST(m5_op, r1, r2, dumprststats_func)
+#define CHECKPOINT(r1, r2) INST(m5_op, r1, r2, ckpt_func)
+
+	.set noreorder
+
+	.align 4
+LEAF(arm)
+	ARM(16)
+	RET
+END(arm)
+
+	.align 4
+LEAF(quiesce)
+	QUIESCE()
+	RET
+END(quiesce)
+
+	.align 4
+LEAF(ivlb)
+	IVLB(16)
+	RET
+END(ivlb)
+
+	.align 4
+LEAF(ivle)
+	IVLE(16)
+	RET
+END(ivle)
+
+	.align 4
+LEAF(m5exit)
+	M5EXIT(16)
+	RET
+END(m5exit)
+
+	.align 4
+LEAF(initparam)
+	INITPARAM(0)
+	RET
+END(initparam)
+
+	.align 4
+LEAF(reset_stats)
+	RESET_STATS(16, 17)
+	RET
+END(reset_stats)
+
+	.align 4
+LEAF(dump_stats)
+	DUMP_STATS(16, 17)
+	RET
+END(dump_stats)
+
+	.align 4
+LEAF(dumpreset_stats)
+	DUMPRST_STATS(16, 17)
+	RET
+END(dumpreset_stats)
+
+	.align 4
+LEAF(checkpoint)
+	CHECKPOINT(16, 17)
+	RET
+END(checkpoint)
+
diff --git a/util/tap/tap.cc b/util/tap/tap.cc
index 7121ebcbb..2932cec35 100644
--- a/util/tap/tap.cc
+++ b/util/tap/tap.cc
@@ -200,7 +200,7 @@ main(int argc, char *argv[])
     int bufsize = 2000;
     bool listening = false;
     char *device = NULL;
-    char *filter = "";
+    char *filter = NULL;
     char c;
     int daemon = false;
     string host;
@@ -274,16 +274,20 @@ main(int argc, char *argv[])
     if (pcap == NULL)
         panic("pcap_open_live failed: %s\n", errbuf);
 
-    bpf_program program;
-    bpf_u_int32 localnet, netmask;
-    if (pcap_lookupnet(device, &localnet, &netmask, errbuf) == -1)
-        panic("pcap_lookupnet failed: %s\n", errbuf);
+    if (filter) {
+        bpf_program program;
+        bpf_u_int32 localnet, netmask;
+        if (pcap_lookupnet(device, &localnet, &netmask, errbuf) == -1) {
+            DPRINTF("pcap_lookupnet failed: %s\n", errbuf);
+            netmask = 0xffffff00;
+        }
 
-    if (pcap_compile(pcap, &program, filter, 1, netmask) == -1)
-        panic("pcap_compile failed, invalid filter:\n%s\n", filter);
+        if (pcap_compile(pcap, &program, filter, 1, netmask) == -1)
+            panic("pcap_compile failed, invalid filter:\n%s\n", filter);
 
-    if (pcap_setfilter(pcap, &program) == -1)
-        panic("pcap_setfilter failed\n");
+        if (pcap_setfilter(pcap, &program) == -1)
+            panic("pcap_setfilter failed\n");
+    }
 
     eth_t *ethernet = eth_open(device);
     if (!ethernet)