gettimeofday(): an implementation based on CPU invariant TSC support

kernel/include/cls.h

@@ -71,6 +71,11 @@ struct cpu_local_var {
 	int in_interrupt;
 	int no_preempt;
 	int timer_enabled;
+
+	unsigned long tv_sec;
+	unsigned long tv_nsec;
+	unsigned long last_tsc;
+
 } __attribute__((aligned(64)));
 
 

kernel/include/time.h

@@ -19,6 +19,8 @@
 #ifndef __TIME_H
 #define __TIME_H
 
+#define NS_PER_SEC	1000000000UL
+
 typedef long int __time_t;
 
 /* POSIX.1b structure for a time value.  This is like a `struct timeval' but