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+.\" $NetBSD: param.3,v 1.4 2011/04/10 10:02:34 jruoho Exp $
+.\"
+.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
+.\" All rights reserved.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``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 FOUNDATION OR CONTRIBUTORS
+.\" 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 April 10, 2011
+.Dt PARAM 3
+.Os
+.Sh NAME
+.Nm param
+.Nd common parameters
+.Sh SYNOPSIS
+.In sys/param.h
+.Ft size
+.Fn MAX "size a" "size b"
+.Ft size
+.Fn MIN "size a" "size b"
+.Sh DESCRIPTION
+The
+.In sys/param.h
+header includes some common definitions and macros specific to
+.Nx .
+The header is perhaps best characterized as a kernel equivalent of
+.In sys/types.h .
+The following list summarizes the provided definitions and macros.
+.Bl -bullet -offset indent
+.It
+First and foremost, the header defines the version of
+.Nx .
+This is defined as
+.Bd -literal -offset indent
+#define __NetBSD_Version__    599004800   /* 5.99.48 */
+.Ed
+.Pp
+The general format is
+.Dq MMmmrrpp00 ,
+where
+.Sq MM
+and
+.Sq mm
+denote the major and minor version, respectively,
+.Sq rr
+is provided for compatibility, and
+.Sq pp
+defines the patch level.
+.It
+Common utility macros such as
+.Fn MAX
+and
+.Fn MIN
+as well as more specific macros such as
+.Xr STACK 9 ,
+.Xr ctod 9 ,
+.Xr mstohz 9 ,
+.Xr roundup 9 ,
+and
+.Xr setbit 9 .
+.It
+Numerous miscellaneous definitions such as limits,
+constants for the kernel
+.Xr memoryallocators 9 ,
+scale factors used by the scheduler,
+.Xr kthread 9
+priorities, and many others.
+.It
+Definitions provided for historical and compatibility reasons.
+Examples range from definitions such as
+.Dq #define BSD
+to old priority levels used in the kernel.
+.El
+.Sh SEE ALSO
+.Xr bitops 3 ,
+.Xr cdefs 3 ,
+.Xr types 3 ,
+.Xr unistd 3
+.Sh HISTORY
+A
+.In param.h
+header appeared already in the
+.At v4 .