VMMCP: initialization
[akaros.git] / kern / include / time.h
index 3507e44..9d60840 100644 (file)
@@ -5,7 +5,7 @@
 #include <arch/time.h>
 
 /* (newlib) Time Value Specification Structures, P1003.1b-1993, p. 261 */
-typedef long time_t;
+typedef long time_t; /* TODO: this is fucked.  Thanks POSIX. */
 
 struct timespec {
   time_t  tv_sec;   /* Seconds */
@@ -17,6 +17,91 @@ struct itimerspec {
   struct timespec  it_value;     /* Timer expiration */
 };
 
-void udelay(uint64_t usec);
+struct timeval {
+       time_t tv_sec;  /* seconds */
+       time_t tv_usec; /* microseconds */
+};
+
+void train_timing();
+void udelay(uint64_t usec);    /* done in arch-specific files */
+void udelay_sched(uint64_t usec);
+uint64_t tsc2sec(uint64_t tsc_time);
+uint64_t tsc2msec(uint64_t tsc_time);
+uint64_t tsc2usec(uint64_t tsc_time);
+uint64_t tsc2nsec(uint64_t tsc_time);
+uint64_t sec2tsc(uint64_t sec);
+uint64_t msec2tsc(uint64_t msec);
+uint64_t usec2tsc(uint64_t usec);
+uint64_t nsec2tsc(uint64_t nsec);
+uint64_t epoch_tsc(void);
+uint64_t epoch_sec(void);
+uint64_t epoch_msec(void);
+uint64_t epoch_usec(void);
+uint64_t epoch_nsec(void);
+void tsc2timespec(uint64_t tsc_time, struct timespec *ts);
+
+/* Just takes a time measurement.  Meant to be paired with stop_timing.  Use
+ * this if you don't want to muck with overheads or subtraction. */
+static inline __attribute__((always_inline))
+uint64_t start_timing(void)
+{
+    return read_tsc_serialized();
+}
+
+/* Takes a time measurement and subtracts the start time and timing overhead,
+ * to return the detected elapsed time.  Use this if you don't want to muck
+ * with overheads or subtraction. */
+static inline __attribute__((always_inline))
+uint64_t stop_timing(uint64_t start_time)
+{
+    uint64_t diff = read_tsc_serialized();
+    diff -= start_time;
+    diff -= system_timing.timing_overhead;
+       if ((int64_t) diff < 0) {
+               return 1;
+       }
+       return diff;
+}
+
+static inline __attribute__((always_inline))
+uint64_t nsec(void)
+{
+       return tsc2nsec(read_tsc());
+}
+
+
+/* Ancient measurement crap below.  TODO: use or lose it */
+
+#if 0
+#include <pool.h>
+#include <string.h>
+
+#define TIMER_TAG_SIZE 20
+#define MAX_TIMERS 20
+/* timer_t
+ * This struct is used to keep track of counter values as they are spread
+ * throughput code and timing measurements are made calling TAGGED_TIMING_BEGIN
+ * and TAGGED_TIMING_END
+ */
+typedef struct Timer{
+       uint64_t curr_run;
+       uint64_t aggr_run;
+       char label[TIMER_TAG_SIZE];
+} timer_t;
+
+#define TAGGED_TIMING_BEGIN(tag)                    \
+       static timer_t* _timer_##tag = NULL;            \
+       if (_timer_##tag == NULL) {                     \
+               _timer_##tag = POOL_GET(&timer_pool);       \
+               strcpy((_timer_##tag->label), #tag);        \
+               _timer_##tag->aggr_run = 0;                 \
+       }                                               \
+       _timer_##tag->curr_run = start_timing();
+#define TAGGED_TIMING_END(tag)                                              \
+({                                                                          \
+       _timer_##tag->curr_run = stop_timing(_timer_##tag->curr_run);           \
+       _timer_##tag->aggr_run += _timer_##tag->curr_run;                       \
+})
 
+#endif
 #endif /* ROS_KERN_TIME_H */