Ruby: remove reference to g_system_ptr from class Message

This patch was initiated so as to remove reference to g_system_ptr,
the pointer to Ruby System that is used for getting the current time.
That simple change actual requires changing a lot many things in slicc and
garnet. All these changes are related to how time is handled.

In most of the places, g_system_ptr has been replaced by another clock
object. The changes have been done under the assumption that all the
components in the memory system are on the same clock frequency, but the
actual clocks might be distributed.

18 files changed, 138 insertions, 114 deletions

diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/GarnetNetwork_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/GarnetNetwork_d.cc
index c7ac85ad3..6404eb6ff 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/GarnetNetwork_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/GarnetNetwork_d.cc
@@ -272,7 +272,7 @@ GarnetNetwork_d::printLinkStats(ostream& out) const
     for (int i = 0; i < m_link_ptr_vector.size(); i++) {
         average_link_utilization +=
             (double(m_link_ptr_vector[i]->getLinkUtilization())) /
-            (double(g_system_ptr->getTime()-m_ruby_start));
+            (double(curCycle() - m_ruby_start));
 
         vector<int> vc_load = m_link_ptr_vector[i]->getVcLoad();
         for (int j = 0; j < vc_load.size(); j++) {
@@ -290,8 +290,8 @@ GarnetNetwork_d::printLinkStats(ostream& out) const
         if (!m_in_use[i/m_vcs_per_vnet])
             continue;
 
-        average_vc_load[i] = (double(average_vc_load[i]) /
-            (double(g_system_ptr->getTime()) - m_ruby_start));
+        average_vc_load[i] = (double(average_vc_load[i])) /
+            (double(curCycle() - m_ruby_start));
         out << "Average VC Load [" << i << "] = " << average_vc_load[i]
             << " flits/cycle " << endl;
     }
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.cc
index 62b8cd574..2671d781f 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.cc
@@ -53,7 +53,7 @@ InputUnit_d::InputUnit_d(int id, Router_d *router) : Consumer(router)
     // Instantiating the virtual channels
     m_vcs.resize(m_num_vcs);
     for (int i=0; i < m_num_vcs; i++) {
-        m_vcs[i] = new VirtualChannel_d(i);
+        m_vcs[i] = new VirtualChannel_d(i, m_router->curCycle());
     }
 }
 
@@ -67,7 +67,7 @@ void
 InputUnit_d::wakeup()
 {
     flit_d *t_flit;
-    if (m_in_link->isReady()) {
+    if (m_in_link->isReady(m_router->curCycle())) {
 
         t_flit = m_in_link->consumeLink();
         int vc = t_flit->get_vc();
@@ -79,9 +79,9 @@ InputUnit_d::wakeup()
             // Do the route computation for this vc
             m_router->route_req(t_flit, this, vc);
 
-            m_vcs[vc]->set_enqueue_time(g_system_ptr->getTime());
+            m_vcs[vc]->set_enqueue_time(m_router->curCycle());
         } else {
-            t_flit->advance_stage(SA_);
+            t_flit->advance_stage(SA_, m_router->curCycle());
             m_router->swarb_req();
         }
         // write flit into input buffer
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.hh b/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.hh
index 544c4271b..3ebf7c6e9 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.hh
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/InputUnit_d.hh
@@ -56,9 +56,9 @@ class InputUnit_d : public Consumer
     inline int get_inlink_id() { return m_in_link->get_id(); }
 
     inline void
-    set_vc_state(VC_state_type state, int vc)
+    set_vc_state(VC_state_type state, int vc, Time curTime)
     {
-        m_vcs[vc]->set_state(state);
+        m_vcs[vc]->set_state(state, curTime);
     }
 
     inline void
@@ -86,9 +86,9 @@ class InputUnit_d : public Consumer
     }
 
     inline void
-    increment_credit(int in_vc, bool free_signal)
+    increment_credit(int in_vc, bool free_signal, Time curTime)
     {
-        flit_d *t_flit = new flit_d(in_vc, free_signal);
+        flit_d *t_flit = new flit_d(in_vc, free_signal, curTime);
         creditQueue->insert(t_flit);
         m_credit_link->scheduleEvent(1);
     }
@@ -100,16 +100,16 @@ class InputUnit_d : public Consumer
     }
 
     inline void
-    updateRoute(int vc, int outport)
+    updateRoute(int vc, int outport, Time curTime)
     {
         m_vcs[vc]->set_outport(outport);
-        m_vcs[vc]->set_state(VC_AB_);
+        m_vcs[vc]->set_state(VC_AB_, curTime);
     }
 
     inline void
-    grant_vc(int in_vc, int out_vc)
+    grant_vc(int in_vc, int out_vc, Time curTime)
     {
-        m_vcs[in_vc]->grant_vc(out_vc);
+        m_vcs[in_vc]->grant_vc(out_vc, curTime);
     }
 
     inline flit_d*
@@ -125,21 +125,22 @@ class InputUnit_d : public Consumer
     }
 
     inline bool
-    need_stage(int vc, VC_state_type state, flit_stage stage)
+    need_stage(int vc, VC_state_type state, flit_stage stage, Time curTime)
     {
-        return m_vcs[vc]->need_stage(state, stage);
+        return m_vcs[vc]->need_stage(state, stage, curTime);
     }
 
     inline bool
-    need_stage_nextcycle(int vc, VC_state_type state, flit_stage stage)
+    need_stage_nextcycle(int vc, VC_state_type state, flit_stage stage,
+                         Time curTime)
     {
-        return m_vcs[vc]->need_stage_nextcycle(state, stage);
+        return m_vcs[vc]->need_stage_nextcycle(state, stage, curTime);
     }
 
     inline bool
-    isReady(int invc)
+    isReady(int invc, Time curTime)
     {
-        return m_vcs[invc]->isReady();
+        return m_vcs[invc]->isReady(curTime);
     }
 
     inline int
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/NetworkInterface_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/NetworkInterface_d.cc
index 62bee1850..f0e117aad 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/NetworkInterface_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/NetworkInterface_d.cc
@@ -71,7 +71,7 @@ NetworkInterface_d::NetworkInterface_d(int id, int virtual_networks,
 
     for (int i = 0; i < m_num_vcs; i++) {
         m_out_vc_state.push_back(new OutVcState_d(i, m_net_ptr));
-        m_out_vc_state[i]->setState(IDLE_, g_system_ptr->getTime());
+        m_out_vc_state[i]->setState(IDLE_, m_net_ptr->curCycle());
     }
 }
 
@@ -170,12 +170,15 @@ NetworkInterface_d::flitisizeMessage(MsgPtr msg_ptr, int vnet)
 
         for (int i = 0; i < num_flits; i++) {
             m_net_ptr->increment_injected_flits(vnet);
-            flit_d *fl = new flit_d(i, vc, vnet, num_flits, new_msg_ptr);
-            fl->set_delay(g_system_ptr->getTime() - msg_ptr->getTime());
+            flit_d *fl = new flit_d(i, vc, vnet, num_flits, new_msg_ptr,
+                m_net_ptr->curCycle());
+
+            fl->set_delay(m_net_ptr->curCycle() - msg_ptr->getTime());
             m_ni_buffers[vc]->insert(fl);
         }
-        m_ni_enqueue_time[vc] = g_system_ptr->getTime();
-        m_out_vc_state[vc]->setState(ACTIVE_, g_system_ptr->getTime());
+
+        m_ni_enqueue_time[vc] = m_net_ptr->curCycle();
+        m_out_vc_state[vc]->setState(ACTIVE_, m_net_ptr->curCycle());
     }
     return true ;
 }
@@ -191,7 +194,7 @@ NetworkInterface_d::calculateVC(int vnet)
                         m_vc_allocator[vnet] = 0;
 
                 if (m_out_vc_state[(vnet*m_vc_per_vnet) + delta]->isInState(
-                    IDLE_, g_system_ptr->getTime())) {
+                    IDLE_, m_net_ptr->curCycle())) {
                         return ((vnet*m_vc_per_vnet) + delta);
                 }
         }
@@ -212,7 +215,7 @@ void
 NetworkInterface_d::wakeup()
 {
     DPRINTF(RubyNetwork, "m_id: %d woke up at time: %lld",
-            m_id, g_system_ptr->getTime());
+            m_id, m_net_ptr->curCycle());
 
     MsgPtr msg_ptr;
 
@@ -234,7 +237,7 @@ NetworkInterface_d::wakeup()
 
     /*********** Picking messages destined for this NI **********/
 
-    if (inNetLink->isReady()) {
+    if (inNetLink->isReady(m_net_ptr->curCycle())) {
         flit_d *t_flit = inNetLink->consumeLink();
         bool free_signal = false;
         if (t_flit->get_type() == TAIL_ || t_flit->get_type() == HEAD_TAIL_) {
@@ -245,13 +248,14 @@ NetworkInterface_d::wakeup()
         }
         // Simply send a credit back since we are not buffering
         // this flit in the NI
-        flit_d *credit_flit = new flit_d(t_flit->get_vc(), free_signal);
+        flit_d *credit_flit = new flit_d(t_flit->get_vc(), free_signal,
+                                         m_net_ptr->curCycle());
         creditQueue->insert(credit_flit);
         m_ni_credit_link->scheduleEvent(1);
 
         int vnet = t_flit->get_vnet();
         m_net_ptr->increment_received_flits(vnet);
-        int network_delay = g_system_ptr->getTime() -
+        int network_delay = m_net_ptr->curCycle() -
                             t_flit->get_enqueue_time();
         int queueing_delay = t_flit->get_delay();
         m_net_ptr->increment_network_latency(network_delay, vnet);
@@ -261,12 +265,12 @@ NetworkInterface_d::wakeup()
 
     /****************** Checking for credit link *******/
 
-    if (m_credit_link->isReady()) {
+    if (m_credit_link->isReady(m_net_ptr->curCycle())) {
         flit_d *t_flit = m_credit_link->consumeLink();
         m_out_vc_state[t_flit->get_vc()]->increment_credit();
         if (t_flit->is_free_signal()) {
             m_out_vc_state[t_flit->get_vc()]->setState(IDLE_,
-                g_system_ptr->getTime());
+                m_net_ptr->curCycle());
         }
         delete t_flit;
     }
@@ -292,7 +296,9 @@ NetworkInterface_d::scheduleOutputLink()
             vc = 0;
 
         // model buffer backpressure
-        if (m_ni_buffers[vc]->isReady() && m_out_vc_state[vc]->has_credits()) {
+        if (m_ni_buffers[vc]->isReady(m_net_ptr->curCycle()) &&
+            m_out_vc_state[vc]->has_credits()) {
+
             bool is_candidate_vc = true;
             int t_vnet = get_vnet(vc);
             int vc_base = t_vnet * m_vc_per_vnet;
@@ -301,7 +307,7 @@ NetworkInterface_d::scheduleOutputLink()
                 for (int vc_offset = 0; vc_offset < m_vc_per_vnet;
                      vc_offset++) {
                     int t_vc = vc_base + vc_offset;
-                    if (m_ni_buffers[t_vc]->isReady()) {
+                    if (m_ni_buffers[t_vc]->isReady(m_net_ptr->curCycle())) {
                         if (m_ni_enqueue_time[t_vc] < m_ni_enqueue_time[vc]) {
                             is_candidate_vc = false;
                             break;
@@ -315,7 +321,7 @@ NetworkInterface_d::scheduleOutputLink()
             m_out_vc_state[vc]->decrement_credit();
             // Just removing the flit
             flit_d *t_flit = m_ni_buffers[vc]->getTopFlit();
-            t_flit->set_time(g_system_ptr->getTime() + 1);
+            t_flit->set_time(m_net_ptr->curCycle() + 1);
             outSrcQueue->insert(t_flit);
             // schedule the out link
             outNetLink->scheduleEvent(1);
@@ -350,7 +356,7 @@ NetworkInterface_d::checkReschedule()
         }
     }
     for (int vc = 0; vc < m_num_vcs; vc++) {
-        if (m_ni_buffers[vc]->isReadyForNext()) {
+        if (m_ni_buffers[vc]->isReadyForNext(m_net_ptr->curCycle())) {
             scheduleEvent(1);
             return;
         }
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.cc
index 6d12fc30e..80a050207 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.cc
@@ -66,9 +66,9 @@ NetworkLink_d::setSourceQueue(flitBuffer_d *srcQueue)
 void
 NetworkLink_d::wakeup()
 {
-    if (link_srcQueue->isReady()) {
+    if (link_srcQueue->isReady(curCycle())) {
         flit_d *t_flit = link_srcQueue->getTopFlit();
-        t_flit->set_time(g_system_ptr->getTime() + m_latency);
+        t_flit->set_time(curCycle() + m_latency);
         linkBuffer->insert(t_flit);
         link_consumer->scheduleEvent(m_latency);
         m_link_utilized++;
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.hh b/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.hh
index f27e60757..c52c903e0 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.hh
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/NetworkLink_d.hh
@@ -62,7 +62,7 @@ class NetworkLink_d : public ClockedObject, public Consumer
 
     double calculate_power();
 
-    inline bool isReady()           { return linkBuffer->isReady(); }
+    inline bool isReady(Time curTime) { return linkBuffer->isReady(curTime); }
     inline flit_d* peekLink()       { return linkBuffer->peekTopFlit(); }
     inline flit_d* consumeLink()    { return linkBuffer->getTopFlit(); }
     void init_net_ptr(GarnetNetwork_d* net_ptr)
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.cc
index 33d1583e1..7422a5165 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.cc
@@ -66,7 +66,7 @@ OutputUnit_d::decrement_credit(int out_vc)
 void
 OutputUnit_d::wakeup()
 {
-    if (m_credit_link->isReady()) {
+    if (m_credit_link->isReady(m_router->curCycle())) {
         flit_d *t_flit = m_credit_link->consumeLink();
         int out_vc = t_flit->get_vc();
         m_outvc_state[out_vc]->increment_credit();
@@ -75,7 +75,7 @@ OutputUnit_d::wakeup()
                                   m_outvc_state[out_vc]->get_credit_count());
 
         if (t_flit->is_free_signal())
-            set_vc_state(IDLE_, out_vc);
+            set_vc_state(IDLE_, out_vc, m_router->curCycle());
 
         delete t_flit;
     }
@@ -102,7 +102,7 @@ OutputUnit_d::set_credit_link(CreditLink_d *credit_link)
 void
 OutputUnit_d::update_vc(int vc, int in_port, int in_vc)
 {
-    m_outvc_state[vc]->setState(ACTIVE_, g_system_ptr->getTime() + 1);
+    m_outvc_state[vc]->setState(ACTIVE_, m_router->curCycle() + 1);
     m_outvc_state[vc]->set_inport(in_port);
     m_outvc_state[vc]->set_invc(in_vc);
     m_router->update_incredit(in_port, in_vc,
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.hh b/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.hh
index 750c71b32..4fa7dcb90 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.hh
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/OutputUnit_d.hh
@@ -69,16 +69,15 @@ class OutputUnit_d : public Consumer
     }
 
     inline void
-    set_vc_state(VC_state_type state, int vc)
+    set_vc_state(VC_state_type state, int vc, Time curTime)
     {
-        m_outvc_state[vc]->setState(state, g_system_ptr->getTime() + 1);
+        m_outvc_state[vc]->setState(state, curTime + 1);
     }
 
     inline bool
-    is_vc_idle(int vc)
+    is_vc_idle(int vc, Time curTime)
     {
-        return (m_outvc_state[vc]->isInState(IDLE_,
-                                             g_system_ptr->getTime()));
+        return (m_outvc_state[vc]->isInState(IDLE_, curTime));
     }
 
     inline void
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/RoutingUnit_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/RoutingUnit_d.cc
index 35a9f06e1..e68c08613 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/RoutingUnit_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/RoutingUnit_d.cc
@@ -57,8 +57,8 @@ void
 RoutingUnit_d::RC_stage(flit_d *t_flit, InputUnit_d *in_unit, int invc)
 {
     int outport = routeCompute(t_flit);
-    in_unit->updateRoute(invc, outport);
-    t_flit->advance_stage(VA_);
+    in_unit->updateRoute(invc, outport, m_router->curCycle());
+    t_flit->advance_stage(VA_, m_router->curCycle());
     m_router->vcarb_req();
 }
 
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/SWallocator_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/SWallocator_d.cc
index 41ff8d482..ab3f4b761 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/SWallocator_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/SWallocator_d.cc
@@ -113,8 +113,10 @@ SWallocator_d::arbitrate_inports()
                 get_vnet(invc))))
                 continue;
 
-            if (m_input_unit[inport]->need_stage(invc, ACTIVE_, SA_) &&
-               m_input_unit[inport]->has_credits(invc)) {
+            if (m_input_unit[inport]->need_stage(invc, ACTIVE_, SA_,
+                                                 m_router->curCycle()) &&
+                m_input_unit[inport]->has_credits(invc)) {
+
                 if (is_candidate_inport(inport, invc)) {
                     int outport = m_input_unit[inport]->get_route(invc);
                     m_local_arbiter_activity++;
@@ -137,7 +139,8 @@ SWallocator_d::is_candidate_inport(int inport, int invc)
     if ((m_router->get_net_ptr())->isVNetOrdered(t_vnet)) {
         for (int vc_offset = 0; vc_offset < m_vc_per_vnet; vc_offset++) {
             int temp_vc = vc_base + vc_offset;
-            if (m_input_unit[inport]->need_stage(temp_vc, ACTIVE_, SA_) &&
+            if (m_input_unit[inport]->need_stage(temp_vc, ACTIVE_, SA_,
+                                                 m_router->curCycle()) &&
                (m_input_unit[inport]->get_route(temp_vc) == outport) &&
                (m_input_unit[inport]->get_enqueue_time(temp_vc) <
                     t_enqueue_time)) {
@@ -175,28 +178,34 @@ SWallocator_d::arbitrate_outports()
 
                 // remove flit from Input Unit
                 flit_d *t_flit = m_input_unit[inport]->getTopFlit(invc);
-                t_flit->advance_stage(ST_);
+                t_flit->advance_stage(ST_, m_router->curCycle());
                 t_flit->set_vc(outvc);
                 t_flit->set_outport(outport);
-                t_flit->set_time(g_system_ptr->getTime() + 1);
+                t_flit->set_time(m_router->curCycle() + 1);
                 m_output_unit[outport]->decrement_credit(outvc);
                 m_router->update_sw_winner(inport, t_flit);
                 m_global_arbiter_activity++;
 
                 if ((t_flit->get_type() == TAIL_) ||
                     t_flit->get_type() == HEAD_TAIL_) {
+
                     // Send a credit back
                     // along with the information that this VC is now idle
-                    m_input_unit[inport]->increment_credit(invc, true);
+                    m_input_unit[inport]->increment_credit(invc, true,
+                        m_router->curCycle());
+
                     // This Input VC should now be empty
-                    assert(m_input_unit[inport]->isReady(invc) == false);
+                    assert(m_input_unit[inport]->isReady(invc,
+                        m_router->curCycle()) == false);
 
-                    m_input_unit[inport]->set_vc_state(IDLE_, invc);
+                    m_input_unit[inport]->set_vc_state(IDLE_, invc,
+                        m_router->curCycle());
                     m_input_unit[inport]->set_enqueue_time(invc, INFINITE_);
                 } else {
                     // Send a credit back
                     // but do not indicate that the VC is idle
-                    m_input_unit[inport]->increment_credit(invc, false);
+                    m_input_unit[inport]->increment_credit(invc, false,
+                        m_router->curCycle());
                 }
                 break; // got a in request for this outport
             }
@@ -209,7 +218,8 @@ SWallocator_d::check_for_wakeup()
 {
     for (int i = 0; i < m_num_inports; i++) {
         for (int j = 0; j < m_num_vcs; j++) {
-            if (m_input_unit[i]->need_stage_nextcycle(j, ACTIVE_, SA_)) {
+            if (m_input_unit[i]->need_stage_nextcycle(j, ACTIVE_, SA_,
+                                                      m_router->curCycle())) {
                 scheduleEvent(1);
                 return;
             }
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/Switch_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/Switch_d.cc
index 1cb31c3e3..db7446f7a 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/Switch_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/Switch_d.cc
@@ -65,16 +65,16 @@ void
 Switch_d::wakeup()
 {
     DPRINTF(RubyNetwork, "Switch woke up at time: %lld\n",
-            g_system_ptr->getTime());
+            m_router->curCycle());
 
     for (int inport = 0; inport < m_num_inports; inport++) {
-        if (!m_switch_buffer[inport]->isReady())
+        if (!m_switch_buffer[inport]->isReady(m_router->curCycle()))
             continue;
         flit_d *t_flit = m_switch_buffer[inport]->peekTopFlit();
-        if (t_flit->is_stage(ST_)) {
+        if (t_flit->is_stage(ST_, m_router->curCycle())) {
             int outport = t_flit->get_outport();
-            t_flit->advance_stage(LT_);
-            t_flit->set_time(g_system_ptr->getTime() + 1);
+            t_flit->advance_stage(LT_, m_router->curCycle());
+            t_flit->set_time(m_router->curCycle() + 1);
 
             // This will take care of waking up the Network Link
             m_output_unit[outport]->insert_flit(t_flit);
@@ -89,7 +89,7 @@ void
 Switch_d::check_for_wakeup()
 {
     for (int inport = 0; inport < m_num_inports; inport++) {
-        if (m_switch_buffer[inport]->isReadyForNext()) {
+        if (m_switch_buffer[inport]->isReadyForNext(m_router->curCycle())) {
             scheduleEvent(1);
             break;
         }
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/VCallocator_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/VCallocator_d.cc
index 75533fb10..012837362 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/VCallocator_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/VCallocator_d.cc
@@ -132,7 +132,8 @@ VCallocator_d::is_invc_candidate(int inport_iter, int invc_iter)
     if ((m_router->get_net_ptr())->isVNetOrdered(vnet)) {
         for (int vc_offset = 0; vc_offset < m_vc_per_vnet; vc_offset++) {
             int temp_vc = invc_base + vc_offset;
-            if (m_input_unit[inport_iter]->need_stage(temp_vc, VC_AB_, VA_) &&
+            if (m_input_unit[inport_iter]->need_stage(temp_vc, VC_AB_, VA_,
+                                                      m_router->curCycle()) &&
                (m_input_unit[inport_iter]->get_route(temp_vc) == outport) &&
                (m_input_unit[inport_iter]->get_enqueue_time(temp_vc) <
                     t_enqueue_time)) {
@@ -163,7 +164,7 @@ VCallocator_d::select_outvc(int inport_iter, int invc_iter)
         if (outvc_offset >= num_vcs_per_vnet)
             outvc_offset = 0;
         int outvc = outvc_base + outvc_offset;
-        if (m_output_unit[outport]->is_vc_idle(outvc)) {
+        if (m_output_unit[outport]->is_vc_idle(outvc, m_router->curCycle())) {
             m_local_arbiter_activity[vnet]++;
             m_outvc_req[outport][outvc][inport_iter][invc_iter] = true;
             if (!m_outvc_is_req[outport][outvc])
@@ -182,8 +183,8 @@ VCallocator_d::arbitrate_invcs()
                 get_vnet(invc_iter))))
                 continue;
 
-            if (m_input_unit[inport_iter]->need_stage(
-                invc_iter, VC_AB_, VA_)) {
+            if (m_input_unit[inport_iter]->need_stage(invc_iter, VC_AB_,
+                    VA_, m_router->curCycle())) {
                 if (!is_invc_candidate(inport_iter, invc_iter))
                     continue;
 
@@ -231,7 +232,8 @@ VCallocator_d::arbitrate_outvcs()
                 int invc = invc_base + invc_offset;
                 if (m_outvc_req[outport_iter][outvc_iter][inport][invc]) {
                     m_global_arbiter_activity[vnet]++;
-                    m_input_unit[inport]->grant_vc(invc, outvc_iter);
+                    m_input_unit[inport]->grant_vc(invc, outvc_iter,
+                        m_router->curCycle());
                     m_output_unit[outport_iter]->update_vc(
                         outvc_iter, inport, invc);
                     m_router->swarb_req();
@@ -256,7 +258,8 @@ VCallocator_d::check_for_wakeup()
 {
     for (int i = 0; i < m_num_inports; i++) {
         for (int j = 0; j < m_num_vcs; j++) {
-            if (m_input_unit[i]->need_stage_nextcycle(j, VC_AB_, VA_)) {
+            if (m_input_unit[i]->need_stage_nextcycle(j, VC_AB_, VA_,
+                   m_router->curCycle())) {
                 scheduleEvent(1);
                 return;
             }
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.cc
index 96d873009..4fd2ebbbf 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.cc
@@ -30,12 +30,12 @@
 
 #include "mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.hh"
 
-VirtualChannel_d::VirtualChannel_d(int id)
+VirtualChannel_d::VirtualChannel_d(int id, Time curTime)
 {
     m_id = id;
     m_input_buffer = new flitBuffer_d();
     m_vc_state.first = IDLE_;
-    m_vc_state.second = g_system_ptr->getTime();
+    m_vc_state.second = curTime;
     m_enqueue_time = INFINITE_;
 }
 
@@ -51,37 +51,36 @@ VirtualChannel_d::set_outport(int outport)
 }
 
 void
-VirtualChannel_d::grant_vc(int out_vc)
+VirtualChannel_d::grant_vc(int out_vc, Time curTime)
 {
     m_output_vc = out_vc;
     m_vc_state.first = ACTIVE_;
-    m_vc_state.second = g_system_ptr->getTime() + 1;
+    m_vc_state.second = curTime + 1;
     flit_d *t_flit = m_input_buffer->peekTopFlit();
-    t_flit->advance_stage(SA_);
+    t_flit->advance_stage(SA_, curTime);
 }
 
 bool
-VirtualChannel_d::need_stage(VC_state_type state, flit_stage stage)
+VirtualChannel_d::need_stage(VC_state_type state, flit_stage stage,
+                             Time curTime)
 {
-    if ((m_vc_state.first == state) &&
-       (g_system_ptr->getTime() >= m_vc_state.second)) {
-        if (m_input_buffer->isReady()) {
+    if ((m_vc_state.first == state) && (curTime >= m_vc_state.second)) {
+        if (m_input_buffer->isReady(curTime)) {
             flit_d *t_flit = m_input_buffer->peekTopFlit();
-            return(t_flit->is_stage(stage)) ;
+            return(t_flit->is_stage(stage, curTime)) ;
         }
     }
     return false;
-
 }
 
 bool
-VirtualChannel_d::need_stage_nextcycle(VC_state_type state, flit_stage stage)
+VirtualChannel_d::need_stage_nextcycle(VC_state_type state, flit_stage stage,
+                                       Time curTime)
 {
-    if ((m_vc_state.first == state) &&
-       ((g_system_ptr->getTime()+1) >= m_vc_state.second)) {
-        if (m_input_buffer->isReadyForNext()) {
+    if ((m_vc_state.first == state) && ((curTime + 1) >= m_vc_state.second)) {
+        if (m_input_buffer->isReadyForNext(curTime)) {
             flit_d *t_flit = m_input_buffer->peekTopFlit();
-            return(t_flit->is_next_stage(stage)) ;
+            return(t_flit->is_next_stage(stage, curTime)) ;
         }
     }
     return false;
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.hh b/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.hh
index 18553fe2b..6217be1d0 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.hh
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/VirtualChannel_d.hh
@@ -39,13 +39,14 @@
 class VirtualChannel_d
 {
   public:
-    VirtualChannel_d(int id);
+    VirtualChannel_d(int id, Time curTime);
     ~VirtualChannel_d();
 
-    bool need_stage(VC_state_type state, flit_stage stage);
-    bool need_stage_nextcycle(VC_state_type state, flit_stage stage);
+    bool need_stage(VC_state_type state, flit_stage stage, Time curTime);
+    bool need_stage_nextcycle(VC_state_type state, flit_stage stage,
+                              Time curTime);
     void set_outport(int outport);
-    void grant_vc(int out_vc);
+    void grant_vc(int out_vc, Time curTime);
 
     inline Time get_enqueue_time()          { return m_enqueue_time; }
     inline void set_enqueue_time(Time time) { m_enqueue_time = time; }
@@ -56,7 +57,10 @@ class VirtualChannel_d
     inline void update_credit(int credit)   { m_credit_count = credit; }
     inline void increment_credit()          { m_credit_count++; }
 
-    inline bool isReady() { return m_input_buffer->isReady(); }
+    inline bool isReady(Time curTime)
+    {
+        return m_input_buffer->isReady(curTime);
+    }
 
     inline void
     insertFlit(flit_d *t_flit)
@@ -65,10 +69,10 @@ class VirtualChannel_d
     }
 
     inline void
-    set_state(VC_state_type m_state)
+    set_state(VC_state_type m_state, Time curTime)
     {
         m_vc_state.first = m_state;
-        m_vc_state.second = g_system_ptr->getTime() + 1;
+        m_vc_state.second = curTime + 1;
     }
 
     inline flit_d*
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.cc
index 2c4f4e09e..e31989a54 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.cc
@@ -47,22 +47,22 @@ flitBuffer_d::isEmpty()
 }
 
 bool
-flitBuffer_d::isReady()
+flitBuffer_d::isReady(Time curTime)
 {
     if (m_buffer.size() != 0 ) {
         flit_d *t_flit = peekTopFlit();
-        if (t_flit->get_time() <= g_system_ptr->getTime())
+        if (t_flit->get_time() <= curTime)
             return true;
     }
     return false;
 }
 
 bool
-flitBuffer_d::isReadyForNext()
+flitBuffer_d::isReadyForNext(Time curTime)
 {
     if (m_buffer.size() != 0 ) {
         flit_d *t_flit = peekTopFlit();
-        if (t_flit->get_time() <= (g_system_ptr->getTime() + 1))
+        if (t_flit->get_time() <= (curTime + 1))
             return true;
     }
     return false;
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.hh b/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.hh
index 23cbd0bb3..eb7729bef 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.hh
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/flitBuffer_d.hh
@@ -44,8 +44,8 @@ class flitBuffer_d
     flitBuffer_d();
     flitBuffer_d(int maximum_size);
 
-    bool isReady();
-    bool isReadyForNext();
+    bool isReady(Time curTime);
+    bool isReadyForNext(Time curTime);
     bool isEmpty();
     void print(std::ostream& out) const;
     bool isFull();
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.cc b/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.cc
index 93364348e..07aea133f 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.cc
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.cc
@@ -30,12 +30,13 @@
 
 #include "mem/ruby/network/garnet/fixed-pipeline/flit_d.hh"
 
-flit_d::flit_d(int id, int  vc, int vnet, int size, MsgPtr msg_ptr)
+flit_d::flit_d(int id, int  vc, int vnet, int size, MsgPtr msg_ptr,
+    Time curTime)
 {
     m_size = size;
     m_msg_ptr = msg_ptr;
-    m_enqueue_time = g_system_ptr->getTime();
-    m_time = g_system_ptr->getTime();
+    m_enqueue_time = curTime;
+    m_time = curTime;
     m_id = id;
     m_vnet = vnet;
     m_vc = vc;
@@ -54,12 +55,12 @@ flit_d::flit_d(int id, int  vc, int vnet, int size, MsgPtr msg_ptr)
         m_type = BODY_;
 }
 
-flit_d::flit_d(int vc, bool is_free_signal)
+flit_d::flit_d(int vc, bool is_free_signal, Time curTime)
 {
     m_id = 0;
     m_vc = vc;
     m_is_free_signal = is_free_signal;
-    m_time = g_system_ptr->getTime();
+    m_time = curTime;
 }
 
 void
diff --git a/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.hh b/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.hh
index 4295cbf6b..549dd59d5 100644
--- a/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.hh
+++ b/src/mem/ruby/network/garnet/fixed-pipeline/flit_d.hh
@@ -40,8 +40,8 @@
 class flit_d
 {
   public:
-    flit_d(int id, int vc, int vnet, int size, MsgPtr msg_ptr);
-    flit_d(int vc, bool is_free_signal);
+    flit_d(int id, int vc, int vnet, int size, MsgPtr msg_ptr, Time curTime);
+    flit_d(int vc, bool is_free_signal, Time curTime);
     void set_outport(int port) { m_outport = port; }
     int get_outport() {return m_outport; }
     void print(std::ostream& out) const;
@@ -58,25 +58,26 @@ class flit_d
     flit_type get_type() { return m_type; }
 
     bool
-    is_stage(flit_stage t_stage)
+    is_stage(flit_stage t_stage, Time curTime)
     {
         return (m_stage.first == t_stage &&
-                g_system_ptr->getTime() >= m_stage.second);
+                curTime >= m_stage.second);
     }
 
     bool
-    is_next_stage(flit_stage t_stage)
+    is_next_stage(flit_stage t_stage, Time curTime)
     {
         return (m_stage.first == t_stage &&
-                (g_system_ptr->getTime() + 1) >= m_stage.second);
+                (curTime + 1) >= m_stage.second);
     }
 
     void
-    advance_stage(flit_stage t_stage)
+    advance_stage(flit_stage t_stage, Time curTime)
     {
         m_stage.first = t_stage;
-        m_stage.second = g_system_ptr->getTime() + 1;
+        m_stage.second = curTime + 1;
     }
+
     std::pair<flit_stage, Time>
     get_stage()
     {