Replace curTick global variable with accessor functions.

This step makes it easy to replace the accessor functions
(which still access a global variable) with ones that access
per-thread curTick values.

src/dev/arm/pl011.cc

@@ -187,7 +187,7 @@ Pl011::write(PacketPtr pkt)
             DPRINTF(Uart, "TX int enabled, scheduling interruptt\n");
             rawInt.txim = 1;
             if (!intEvent.scheduled())
-                schedule(intEvent, curTick + intDelay);
+                schedule(intEvent, curTick() + intDelay);
         }
 
         break;
@@ -217,7 +217,7 @@ Pl011::write(PacketPtr pkt)
             DPRINTF(Uart, "Writing to IMSC: TX int enabled, scheduling interruptt\n");
             rawInt.txim = 1;
             if (!intEvent.scheduled())
-                schedule(intEvent, curTick + intDelay);
+                schedule(intEvent, curTick() + intDelay);
         }
 
         break;
@@ -252,7 +252,7 @@ Pl011::dataAvailable()
     DPRINTF(Uart, "Data available, scheduling interrupt\n");
 
     if (!intEvent.scheduled())
-        schedule(intEvent, curTick + intDelay);
+        schedule(intEvent, curTick() + intDelay);
 }
 
 void

src/dev/arm/pl111.cc

@@ -355,7 +355,7 @@ Pl111::readFramebuffer()
         startAddr = lcdUpbase;
     }
     curAddr = 0;
-    startTime = curTick;
+    startTime = curTick();
     maxAddr = static_cast<Addr>(length*sizeof(uint32_t));
     dmaPendingNum =0 ;
 
@@ -388,9 +388,9 @@ Pl111::dmaDone()
     DPRINTF(PL111, " -- DMA pending number %d\n", dmaPendingNum);
 
     if (maxAddr == curAddr && !dmaPendingNum) {
-        if ((curTick - startTime) > maxFrameTime)
+        if ((curTick() - startTime) > maxFrameTime)
             warn("CLCD controller buffer underrun, took %d cycles when should"
-                 " have taken %d\n", curTick - startTime, maxFrameTime);
+                 " have taken %d\n", curTick() - startTime, maxFrameTime);
 
         // double buffering so the vnc server doesn't see a tear in the screen
         memcpy(frameBuffer, dmaBuffer, maxAddr);
@@ -400,7 +400,7 @@ Pl111::dmaDone()
         writeBMP(frameBuffer);
 
         DPRINTF(PL111, "-- schedule next dma read event at %d tick \n",
-                maxFrameTime + curTick);
+                maxFrameTime + curTick());
         schedule(readEvent, nextCycle(startTime + maxFrameTime));
     }
 
@@ -415,7 +415,7 @@ Pl111::dmaDone()
 Tick
 Pl111::nextCycle()
 {
-    Tick nextTick = curTick + clock - 1;
+    Tick nextTick = curTick() + clock - 1;
     nextTick -= nextTick%clock;
     return nextTick;
 }
@@ -427,7 +427,7 @@ Pl111::nextCycle(Tick beginTick)
     if (nextTick%clock!=0)
         nextTick = nextTick - (nextTick%clock) + clock;
 
-    assert(nextTick >= curTick);
+    assert(nextTick >= curTick());
     return nextTick;
 }
 

src/dev/arm/rv_ctrl.cc

@@ -62,7 +62,7 @@ RealViewCtrl::read(PacketPtr pkt)
         break;
       case Clock24:
         Tick clk;
-        clk = (Tick)(curTick / (24 * SimClock::Float::MHz));
+        clk = (Tick)(curTick() / (24 * SimClock::Float::MHz));
         pkt->set((uint32_t)(clk));
         break;
       case Flash:

src/dev/arm/timer_sp804.cc

@@ -93,7 +93,7 @@ Sp804::Timer::read(PacketPtr pkt, Addr daddr)
         DPRINTF(Timer, "Event schedule for %d, clock=%d, prescale=%d\n",
                 zeroEvent.when(), clock, control.timerPrescale);
         Tick time;
-        time = zeroEvent.when() - curTick;
+        time = zeroEvent.when() - curTick();
         time = time / clock / power(16, control.timerPrescale);
         DPRINTF(Timer, "-- returning counter at %d\n", time);
         pkt->set<uint32_t>(time);
@@ -188,8 +188,8 @@ Sp804::Timer::restartCounter(uint32_t val)
         DPRINTF(Timer, "-- Event was already schedule, de-scheduling\n");
         parent->deschedule(zeroEvent);
     }
-    parent->schedule(zeroEvent, curTick + time);
-    DPRINTF(Timer, "-- Scheduling new event for: %d\n", curTick + time);
+    parent->schedule(zeroEvent, curTick() + time);
+    DPRINTF(Timer, "-- Scheduling new event for: %d\n", curTick() + time);
 }
 
 void