From d1aee9f1535b02dc3db2a5bd1ac75213068a675a Mon Sep 17 00:00:00 2001
From: Nick Banks <nickbanks@netflix.com>
Date: Tue, 12 May 2026 21:26:24 +0200
Subject: [PATCH] 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
---
 sys/sys/time.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sys/sys/time.h b/sys/sys/time.h
index 5255d3bc9c7..ecde8a82649 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)
 {