From 25bcd81b8d12468e28e438f58dd58e7c5ea8f8db Mon Sep 17 00:00:00 2001
From: Wojciech Macek <wma@FreeBSD.org>
Date: Mon, 14 Mar 2022 07:51:21 +0100
Subject: [PATCH] armv6/legacy: optimize cpu_getcount performance

Use nanotime instread of binuptime.
This change is for old and legacy platforms and does not impact any armv7 and later.
Might be MFCed to 13.0 once armv6 support is finally dropped in 14.0

Sponsored by:		Stormshield
Reviewed by:		mw
Obtained from:		Semihalf
Differential revision:	https://reviews.freebsd.org/D33719
---
 sys/arm/include/cpu.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sys/arm/include/cpu.h b/sys/arm/include/cpu.h
index 14e19581b81..86f16131f03 100644
--- a/sys/arm/include/cpu.h
+++ b/sys/arm/include/cpu.h
@@ -40,11 +40,11 @@ get_cyclecount(void)
 	} else
 #endif
 		return cp15_pmccntr_get();
-#else /* No performance counters, so use binuptime(9). This is slooooow */
-	struct bintime bt;
+#else /* No performance counters, so use nanotime(9). */
+	struct timespec tv;
 
-	binuptime(&bt);
-	return ((uint64_t)bt.sec << 56 | bt.frac >> 8);
+	nanotime(&tv);
+	return (tv.tv_sec * (uint64_t)1000000000ull + tv.tv_nsec);
 #endif
 }
 #endif