[coreboot-gerrit] New patch to review for coreboot: b584b5d timer: add stopwatch construct
Patrick Georgi (pgeorgi@google.com)
gerrit at coreboot.org
Fri Mar 20 13:05:45 CET 2015
Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8810
-gerrit
commit b584b5d2d62846f7a59813894eddb7f6ff3e007f
Author: Aaron Durbin <adurbin at chromium.org>
Date: Tue Sep 23 16:28:43 2014 -0500
timer: add stopwatch construct
There's a lot of places where expiration and running time are
open coded. Allow for those places to be simplified by adding
a stopwatch construct. The stopwatch can have an expiration or
just be used to accumulate time.
BUG=None
TEST=Built and verified API works as expected by using implementation.
Change-Id: I53604900fea7d46beeccc17f1dc7900d5f28518b
Signed-off-by: Aaron Durbin <adurbin at chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/219492
Reviewed-by: Vadim Bendebury <vbendeb at chromium.org>
Reviewed-by: Furquan Shaikh <furquan at chromium.org>
Reviewed-by: David Hendricks <dhendrix at chromium.org>
---
src/include/timer.h | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)
diff --git a/src/include/timer.h b/src/include/timer.h
index b37cea4..b034da2 100644
--- a/src/include/timer.h
+++ b/src/include/timer.h
@@ -175,4 +175,64 @@ static inline long mono_time_diff_microseconds(const struct mono_time *t1,
return rela_time_in_microseconds(&rt);
}
+struct stopwatch {
+ struct mono_time start;
+ struct mono_time current;
+ struct mono_time expires;
+};
+
+static inline void stopwatch_init(struct stopwatch *sw)
+{
+ timer_monotonic_get(&sw->start);
+ sw->current = sw->expires = sw->start;
+}
+
+static inline void stopwatch_init_usecs_expire(struct stopwatch *sw, long us)
+{
+ stopwatch_init(sw);
+ mono_time_add_usecs(&sw->expires, us);
+}
+
+static inline void stopwatch_init_msecs_expire(struct stopwatch *sw, long ms)
+{
+ stopwatch_init_usecs_expire(sw, USECS_PER_MSEC * ms);
+}
+
+/*
+ * Tick the stopwatch to collect the current time.
+ */
+static inline void stopwatch_tick(struct stopwatch *sw)
+{
+ timer_monotonic_get(&sw->current);
+}
+
+/*
+ * Tick and check the stopwatch for expiration. Returns non-zero on exipration.
+ */
+static inline int stopwatch_expired(struct stopwatch *sw)
+{
+ stopwatch_tick(sw);
+ return !mono_time_before(&sw->current, &sw->expires);
+}
+
+/*
+ * Return number of microseconds since starting the stopwatch.
+ */
+static inline long stopwatch_duration_usecs(struct stopwatch *sw)
+{
+ /*
+ * If the stopwatch hasn't been ticked (current == start) tick
+ * the stopwatch to gather the accumulated time.
+ */
+ if (!mono_time_cmp(&sw->start, &sw->current))
+ stopwatch_tick(sw);
+
+ return mono_time_diff_microseconds(&sw->start, &sw->current);
+}
+
+static inline long stopwatch_duration_msecs(struct stopwatch *sw)
+{
+ return stopwatch_duration_usecs(sw) / USECS_PER_MSEC;
+}
+
#endif /* TIMER_H */
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