[Qemu-devel] Patch: cpu-all.h for better cycle counter

["Todd T. Fries" <todd@fries.net>]

This is relative to the 20070319 snapshot.

--- cpu-all.h.orig	Fri Mar 16 18:58:11 2007
+++ cpu-all.h	Tue Mar 20 21:14:10 2007
@@ -1012,13 +1012,22 @@ static inline int64_t cpu_get_real_ticks
 #endif
 }
 #else
-/* The host CPU doesn't have an easily accessible cycle counter.
-   Just return a monotonically increasing vlue.  This will be totally wrong,
-   but hopefully better than nothing.  */
+# warning non-optimized CPU
+#include <sys/time.h>
+#include <time.h>
+
 static inline int64_t cpu_get_real_ticks (void)
 {
-    static int64_t ticks = 0;
-    return ticks++;
+	struct timeval tv;
+	static int64_t i = 0;
+	int64_t j;
+        
+	gettimeofday(&tv, NULL);
+	do {
+	   j = (tv.tv_sec * (uint64_t) 1000000) + tv.tv_usec;
+	} while (i == j);
+	i = j;
+	return j;
 }
 #endif
 
-- 
Todd Fries .. todd@fries.net

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