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+.\"	$NetBSD: splraise.9,v 1.1 2010/02/06 22:32:08 dyoung Exp $
+.\"
+.\" Copyright (c) 2010 David Young.  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.
+.\" 3. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission.
+.\"
+.\" 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 February 5, 2010
+.Dt SPLRAISE 9
+.Os
+.Sh NAME
+.Nm spllower ,
+.Nm splraise
+.Nd modify system interrupt priority level
+.Sh SYNOPSIS
+.In machine/intr.h
+.Ft void
+.Fn spllower "int s"
+.Ft int
+.Fn splraise "int s"
+.Sh DESCRIPTION
+These functions raise and lower the interrupt priority level
+on i386.
+They are used by machine-dependent kernel code to implement
+the machine-independent
+.Xr spl 9
+interface.
+.Pp
+In a multi-CPU system, these functions change the interrupt
+priority level on the local CPU only.
+In general, device drivers should not make use of these functions.
+.Pp
+The
+.Fn spllower
+function sets the system priority level to the one encoded in
+.Fa s ,
+if
+.Fa s
+is lower than the current level.
+Otherwise, it does not change the level.
+Use
+.Fn splx
+instead
+of
+.Fn spllower ,
+except in extraordinary circumstances.
+.Pp
+The
+.Fn splraise
+function sets the system priority level to the one encoded in
+.Fa s ,
+if
+.Fa s
+is greater than the current level, and returns the previous level.
+Otherwise, it does not change the level, and it returns the current level.
+Except in extraordinary circumstances,
+do not use
+.Fn splraise .
+Use one of the priority-raising functions defined in
+.Xr spl 9 ,
+instead.
+.Sh SEE ALSO
+.Xr condvar 9 ,
+.Xr mutex 9 ,
+.Xr rwlock 9 ,
+.Xr spl 9