X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmisc%2Fbochs-2.1.1-jitter.patch;fp=src%2Fmisc%2Fbochs-2.1.1-jitter.patch;h=d232f0cfc9e545ef93d755ecb424849b3bdbab39;hb=14c61e5782a8e8725de21e3448d902ad2d14d55b;hp=0000000000000000000000000000000000000000;hpb=a03e6f1ca6bb324d2f5bba70982e493e40faf4f5;p=pintos-anon

diff --git a/src/misc/bochs-2.1.1-jitter.patch b/src/misc/bochs-2.1.1-jitter.patch
new file mode 100644
index 0000000..d232f0c
--- /dev/null
+++ b/src/misc/bochs-2.1.1-jitter.patch
@@ -0,0 +1,65 @@
+This patch adds the `jitter' feature described in the project
+documentation, in which timer interrupts are delivered at random
+intervals.
+
+diff -urp bochs-2.1.1.orig/bochs.h bochs-2.1.1/bochs.h
+--- bochs-2.1.1.orig/bochs.h	2004-02-11 14:28:03.000000000 -0800
++++ bochs-2.1.1/bochs.h	2004-09-20 17:02:01.000000000 -0700
+@@ -757,4 +757,6 @@ int bx_init_hardware ();
+ 
+ #endif
+ 
++extern int jitter;
++
+ #endif  /* BX_BOCHS_H */
+diff -urp bochs-2.1.1.orig/iodev/pit82c54.cc bochs-2.1.1/iodev/pit82c54.cc
+--- bochs-2.1.1.orig/iodev/pit82c54.cc	2004-02-11 14:28:53.000000000 -0800
++++ bochs-2.1.1/iodev/pit82c54.cc	2004-09-20 17:18:24.000000000 -0700
+@@ -28,6 +28,7 @@
+ 
+ #include "bochs.h"
+ #include "pit82c54.h"
++#include <stdlib.h>
+ #define LOG_THIS this->
+ 
+ 
+@@ -356,7 +357,13 @@ pit_82C54::clock(Bit8u cnum) {
+       case 2:
+ 	if(thisctr.count_written) {
+ 	  if(thisctr.triggerGATE || thisctr.first_pass) {
+-	    set_count(thisctr, thisctr.inlatch);
++            unsigned n = thisctr.inlatch;
++            if (jitter) {
++                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-2.1.1.orig/main.cc bochs-2.1.1/main.cc
+--- bochs-2.1.1.orig/main.cc	2004-02-11 14:28:41.000000000 -0800
++++ bochs-2.1.1/main.cc	2004-09-20 17:15:39.000000000 -0700
+@@ -58,6 +58,7 @@
+ 
+ 
+ int bochsrc_include_count = 0;
++int jitter = 0;
+ 
+ extern "C" {
+ #include <signal.h>
+@@ -2022,6 +2024,13 @@ bx_init_main (int argc, char *argv[])
+     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];