sys/time.h: add bintime2us() helper

Add a microsecond conversion helper to complement the existing
bintime2ns(). The body mirrors bintime2ns().
This will be used by an upcoming eventlog(9) framework as well as
the TCP code in upcoming changes.

Approved by:		gallatin, tuexen
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D56972

1 files changed, 11 insertions, 0 deletions

diff --git a/sys/sys/time.h b/sys/sys/time.h
index 5255d3bc9c7e..ecde8a826499 100644
--- a/sys/sys/time.h
+++ b/sys/sys/time.h
@@ -308,6 +308,17 @@ bintime2ns(const struct bintime *_bt)
 	return (ret);
 }
 
+static __inline uint64_t
+bintime2us(const struct bintime *_bt)
+{
+	uint64_t ret;
+
+	ret = (uint64_t)(_bt->sec) * (uint64_t)1000000;
+	ret += __utime64_scale64_floor(
+	    _bt->frac, 1000000, 1ULL << 32) >> 32;
+	return (ret);
+}
+
 static __inline void
 timespec2bintime(const struct timespec *_ts, struct bintime *_bt)
 {