bochs-2.2.6-jitter.patch

diff -urp bochs-2.2.6/iodev/pit82c54.cc bochs-2.2.6.orig/iodev/pit82c54.cc
--- bochs-2.2.6.orig/iodev/pit82c54.cc	2006-01-08 12:39:08.000000000 -0800
+++ bochs-2.2.6/iodev/pit82c54.cc	2006-04-03 14:00:27.000000000 -0700
@@ -28,6 +28,7 @@
 
 #include "iodev.h"
 #include "pit82c54.h"
+#include <stdlib.h>
 #define LOG_THIS this->
 
 
@@ -359,7 +360,13 @@
       case 2:
 	if(thisctr.count_written) {
 	  if(thisctr.triggerGATE || thisctr.first_pass) {
-	    set_count(thisctr, thisctr.inlatch);
+            unsigned n = thisctr.inlatch;
+            if (jitter && n > 5) {
+                n *= (double) rand() / RAND_MAX;
+                if (n < 5)
+                    n = 5;
+            }
+	    set_count(thisctr, n);
 	    thisctr.next_change_time=(thisctr.count_binary-1) & 0xFFFF;
 	    thisctr.null_count=0;
 	    if(thisctr.inlatch==1) {
diff -urp bochs-2.2.6/main.cc bochs-2.2.6.orig/main.cc
--- bochs-2.2.6.orig/main.cc	2006-01-22 04:31:15.000000000 -0800
+++ bochs-2.2.6/main.cc	2006-04-03 14:00:54.000000000 -0700
@@ -105,6 +105,7 @@
 #endif
 
 char *bochsrc_filename = NULL;
+int jitter = 0;
 
 void bx_print_header ()
 {
@@ -459,6 +460,13 @@
     else if (!strcmp ("-q", argv[arg])) {
       SIM->get_param_enum(BXP_BOCHS_START)->set (BX_QUICK_START);
     }
+    else if (!strcmp ("-j", argv[arg])) {
+      if (++arg >= argc) BX_PANIC(("-j must be followed by a number"));
+      else {
+        jitter = 1;
+        srand (atoi (argv[arg]));
+      }
+    }
     else if (!strcmp ("-f", argv[arg])) {
       if (++arg >= argc) BX_PANIC(("-f must be followed by a filename"));
       else bochsrc_filename = argv[arg];
diff -up /home/blp/cs140/bochs-2.2.6/bochs.h\~ /home/blp/cs140/bochs-2.2.6/bochs.h
--- bochs-2.2.6/bochs.h.orig	2006-01-28 08:16:02.000000000 -0800
+++ bochs-2.2.6/bochs.h	2006-04-03 14:03:54.000000000 -0700
@@ -698,4 +698,6 @@ int bx_init_hardware ();
 
 #endif
 
+extern int jitter;
+
 #endif  /* BX_BOCHS_H */