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+.\"	$OpenBSD: ffs.9,v 1.2 2022/09/10 08:18:06 jsg Exp $
+.\"
+.\" Copyright (c) 2002, 2003 CubeSoft Communications, Inc.
+.\" <http://www.csoft.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+.\" (INCLUDING BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+.\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: September 10 2022 $
+.Dt FFS 9
+.Os
+.Sh NAME
+.Nm ffs ,
+.Nm fls ,
+.Nm flsl
+.Nd kernel library find bit routines
+.Sh SYNOPSIS
+.In lib/libkern/libkern.h
+.Ft int
+.Fn ffs "int value"
+.Ft int
+.Fn fls "int value"
+.Ft int
+.Fn flsl "long value"
+.Sh DESCRIPTION
+The
+.Fn ffs
+function finds the first bit set in
+.Fa value .
+It has the same semantics as its libc counterpart
+.Xr ffs 3 .
+.Pp
+The
+.Fn fls
+and
+.Fn flsl
+functions find the last bit set in
+.Fa value
+and return the index of that bit.
+.Sh SEE ALSO
+.Xr ffs 3
+.Sh STANDARDS
+The
+.Fn ffs
+function conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn ffs
+function is based on a vax instruction of the same name.