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From 5e6cfa27ba6de331ecc142e7f65b4d1c2112b4e2 Mon Sep 17 00:00:00 2001
From: Alex Busenius <s9albuse@stud.uni-saarland.de>
Date: Mon, 27 Apr 2009 15:33:37 +0200
Subject: bochs-2.3.7 jitter
---
bochs.h | 2 ++
iodev/pit82c54.cc | 9 ++++++++-
main.cc | 8 ++++++++
3 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/bochs.h b/bochs.h
index 2a643cd..75bcd96 100644
--- a/bochs.h
+++ b/bochs.h
@@ -630,4 +630,6 @@ void bx_center_print(FILE *file, const char *line, unsigned maxwidth);
#endif
+extern int jitter;
+
#endif /* BX_BOCHS_H */
diff --git a/iodev/pit82c54.cc b/iodev/pit82c54.cc
index 0d65768..31ac041 100644
--- a/iodev/pit82c54.cc
+++ b/iodev/pit82c54.cc
@@ -28,6 +28,7 @@
#include "iodev.h"
#include "pit82c54.h"
+#include <stdlib.h>
#define LOG_THIS this->
@@ -399,7 +400,13 @@ 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 > 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 --git a/main.cc b/main.cc
index ebdf258..09cf661 100644
--- a/main.cc
+++ b/main.cc
@@ -112,6 +112,7 @@ BOCHSAPI BX_MEM_C bx_mem;
#endif
char *bochsrc_filename = NULL;
+int jitter = 0;
void bx_print_header ()
{
@@ -541,6 +542,13 @@ int bx_init_main(int argc, char *argv[])
else if (!strcmp("-q", argv[arg])) {
SIM->get_param_enum(BXPN_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];
--
1.6.2.3
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