dev: prevent RTC events firing before startup

This change includes edits to MC146818 timer to prevent RTC events
firing before startup to comply with SimObject initialization call sequence.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>

1 files changed, 8 insertions, 4 deletions

diff --git a/src/dev/mc146818.hh b/src/dev/mc146818.hh
index 76cd40c37..936f597d0 100644
--- a/src/dev/mc146818.hh
+++ b/src/dev/mc146818.hh
@@ -51,6 +51,7 @@ class MC146818 : public EventManager
     {
         MC146818 * parent;
         Tick interval;
+        Tick offset;
 
         RTCEvent(MC146818 * _parent, Tick i);
 
@@ -68,11 +69,11 @@ class MC146818 : public EventManager
     struct RTCTickEvent : public Event
     {
         MC146818 * parent;
+        Tick offset;
 
-        RTCTickEvent(MC146818 * _parent) : parent(_parent)
-        {
-            parent->schedule(this, curTick() + SimClock::Int::s);
-        }
+        RTCTickEvent(MC146818 * _parent) :
+            parent(_parent), offset(SimClock::Int::s)
+        {}
 
         /** Event process to occur at interrupt*/
         void process();
@@ -153,6 +154,9 @@ class MC146818 : public EventManager
             bool bcd, Tick frequency);
     virtual ~MC146818();
 
+    /** Start ticking */
+    virtual void startup();
+
     /** RTC write data */
     void writeData(const uint8_t addr, const uint8_t data);