? qemu-notsc.patch
Index: vl.c
===================================================================
RCS file: /cvsroot/qemu/qemu/vl.c,v
retrieving revision 1.196
diff -u -r1.196 vl.c
--- vl.c	26 Jun 2006 21:00:51 -0000	1.196
+++ vl.c	28 Jun 2006 04:48:43 -0000
@@ -129,6 +129,10 @@
 int vm_running;
 int rtc_utc = 1;
 int cirrus_vga_enabled = 1;
+#ifdef __i386__
+static int notsc = 0;
+extern int64_t get_clock(void);
+#endif
 #ifdef TARGET_SPARC
 int graphic_width = 1024;
 int graphic_height = 768;
@@ -523,6 +527,9 @@
     return ti.QuadPart;
 #else
     int64_t val;
+    if (notsc) {
+	return get_clock()<<12;
+    }
     asm volatile ("rdtsc" : "=A" (val));
     return val;
 #endif
@@ -657,6 +664,7 @@
     usec = get_clock() - usec;
     ticks = cpu_get_real_ticks() - ticks;
     ticks_per_sec = (ticks * 1000000LL + (usec >> 1)) / usec;
+    //printf("ticks_per_sec=%lld\n",ticks_per_sec);
 }
 #endif /* !_WIN32 */
 
@@ -5142,6 +5150,9 @@
 #ifdef USE_CODE_COPY
            "-no-code-copy   disable code copy acceleration\n"
 #endif
+#ifdef __i386__
+           "-no-tsc         disable tsc as clock source\n"
+#endif
 #ifdef TARGET_I386
            "-std-vga        simulate a standard VGA card with VESA Bochs Extensions\n"
            "                (default is CL-GD5446 PCI VGA)\n"
@@ -5208,6 +5219,7 @@
     QEMU_OPTION_hdachs,
     QEMU_OPTION_L,
     QEMU_OPTION_no_code_copy,
+    QEMU_OPTION_no_tsc,
     QEMU_OPTION_k,
     QEMU_OPTION_localtime,
     QEMU_OPTION_cirrusvga,
@@ -5283,6 +5295,10 @@
     { "no-kqemu", 0, QEMU_OPTION_no_kqemu },
     { "kernel-kqemu", 0, QEMU_OPTION_kernel_kqemu },
 #endif
+#ifdef __i386__
+    { "no-tsc", 0, QEMU_OPTION_no_tsc },
+#endif
+
 #if defined(TARGET_PPC) || defined(TARGET_SPARC)
     { "g", 1, QEMU_OPTION_g },
 #endif
@@ -5929,7 +5945,12 @@
             case QEMU_OPTION_no_acpi:
                 acpi_enabled = 0;
                 break;
-            }
+#ifdef __i386__
+            case QEMU_OPTION_no_tsc:
+                notsc = 1;
+                break;
+#endif
+	    }
         }
     }