X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmisc%2Fbochs-2.1.1.patch;h=beb23b98c9fede7bb81e7e0f21803c7fcd111030;hb=07ee003af55dc3aab779e95ef2a4f095f6b65964;hp=f470f529fe7655d04b11b396a4d1d3c4de5acdd9;hpb=ac7b54c81e81f4b7a4cc404b5aa21f46a5dbdddd;p=pintos-anon

diff --git a/src/misc/bochs-2.1.1.patch b/src/misc/bochs-2.1.1.patch
index f470f52..beb23b9 100644
--- a/src/misc/bochs-2.1.1.patch
+++ b/src/misc/bochs-2.1.1.patch
@@ -14,6 +14,19 @@ connect a serial port to stdout and it doesn't work under Solaris
 anyway.  This patch is useful everywhere with `pintos', but may not be
 wanted elsewhere.
 
+The remaining patches add the `jitter' feature described in the
+project documentation, in which timer interrupts are delivered at
+random intervals.
+
+To apply all the patches, cd into the Bochs directory, then type
+	patch -p1 < ~/pintos/src/misc/bochs-2.1.1.patch
+You will have to supply the proper path to the patch, of course.  You
+can provide the --dry-run option to patch if you want to test whether
+the patch would apply cleanly before actually patching.
+
+To apply a subset of the patches, use a text editor to delete the
+unwanted patches, then follow the above instructions.
+
 Here's a ./configure invocation for Bochs that works optimally with
 the `pintos' utility:
 	./configure --with-x --with-x11 --with-term --with-nogui
@@ -126,6 +139,8 @@ diff -urp orig/bochs-2.1.1/gdbstub.cc bochs-2.1.1/gdbstub.cc
              mem2hex((char *)registers, obuf, NUMREGSBYTES);
              put_reply(obuf);
              break;
+
+diff -u tmp/bochs-2.1.1/iodev/serial.cc bochs-2.1.1/iodev/serial.cc
 --- tmp/bochs-2.1.1/iodev/serial.cc	2004-02-11 14:28:54.000001000 -0800
 +++ bochs-2.1.1/iodev/serial.cc	2004-09-14 23:02:04.000001000 -0700
 @@ -53,7 +53,7 @@
@@ -153,3 +168,67 @@ diff -urp orig/bochs-2.1.1/gdbstub.cc bochs-2.1.1/gdbstub.cc
    }
  #endif   /* def SERIAL_ENABLE */
    // nothing for now
+
+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/iodev/pit_wrap.cc bochs-2.1.1/iodev/pit_wrap.cc
+diff -urp bochs-2.1.1.orig/iodev/serial.cc bochs-2.1.1/iodev/serial.cc
+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];