Add -rt option to synch sim to wall time

	* Active during cpu power-down to avoid run-away
	  sim time. Useful for interactive applications.

4 files changed, 26 insertions, 0 deletions

diff --git a/func.c b/func.c
index 23bc31a..07f585c 100644
--- a/func.c
+++ b/func.c
@@ -63,6 +63,7 @@ uint32 last_load_addr = 0;
 int nouartrx = 0;
 int port = 1234;
 int sim_run = 0;
+int sync_rt = 0;
 
 /* RAM and ROM for all systems */
 char romb[ROM_SIZE];
@@ -1054,6 +1055,23 @@ pwd_enter (struct pstate *sregs)
   sregs->hold += delta;
 }
 
+void
+rt_sync()
+{
+  double walltime, realtime, dtime;
+  int64 stime;
+  stime = ebase.simtime - ebase.simstart;	/* Total simulated time */
+  realtime = (double) ((stime) / 1000000.0 / ebase.freq);
+  walltime = ebase.tottime + get_time () - ebase.starttime;
+  dtime = (realtime - walltime);
+  if (dtime > 0.001)
+  {
+    if (dtime > 1.0)
+      dtime = 0.1;
+    usleep ((useconds_t) (dtime * 1E6));
+  }
+}
+
 int
 check_bpt (sregs)
      struct pstate *sregs;
diff --git a/sis.c b/sis.c
index ff351f8..2dc76ce 100644
--- a/sis.c
+++ b/sis.c
@@ -147,6 +147,10 @@ main (argc, argv)
 	    {
 	      run = 1;
 	    }
+	  else if (strcmp (argv[stat], "-rt") == 0)
+	    {
+	      sync_rt = 1;
+	    }
 	  else if (strcmp (argv[stat], "-erc32") == 0)
 	    {
 	      lcputype = CPU_ERC32;
diff --git a/sis.h b/sis.h
index 35797e4..4eccb83 100644
--- a/sis.h
+++ b/sis.h
@@ -325,6 +325,8 @@ extern void int_handler (int sig);
 extern uint32 daddr;
 extern void l1data_update (uint32 address, uint32 cpu);
 extern void l1data_snoop (uint32 address, uint32 cpu);
+extern int sync_rt;
+extern void rt_sync();
 
 /* exec.c */
 extern void init_regs (struct pstate *sregs);
diff --git a/sparc.c b/sparc.c
index dee95c1..01cbe04 100644
--- a/sparc.c
+++ b/sparc.c
@@ -916,6 +916,8 @@ sparc_dispatch_instruction (sregs)
 		  else if (19 == rd)
 		    {
 		      pwd_enter (sregs);
+		      if (sync_rt)
+		        rt_sync();
 		    }
 		}
 	      break;