diff --git a/share/man/man9/cpu_idle.9 b/share/man/man9/cpu_idle.9
new file mode 100644
index 000000000000..87cc6f63b310
--- /dev/null
+++ b/share/man/man9/cpu_idle.9
@@ -0,0 +1,68 @@
+.\"	$NetBSD: cpu_idle.9,v 1.5 2007/02/17 16:23:08 yamt Exp $
+.\"
+.\" Copyright (c)2007 YAMAMOTO Takashi,
+.\" 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 AUTHOR 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 AUTHOR 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 February 17, 2007
+.Dt CPU_IDLE 9
+.Os
+.\" ------------------------------------------------------------
+.Sh NAME
+.Nm cpu_idle
+.Nd machine-dependent processor idling interface
+.\" ------------------------------------------------------------
+.Sh SYNOPSIS
+.In sys/proc.h
+.\" - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+.Ft void
+.Fn cpu_idle \
+"void"
+.\" ------------------------------------------------------------
+.Sh DESCRIPTION
+.Fn cpu_idle
+is called by machine-independent code when the processor has
+nothing to do.
+It can be used to conserve the processor power, for example.
+.Pp
+.Fn cpu_idle
+returns as soon as possible when
+.Fn cpu_need_resched
+is called for the processor.
+Otherwise, it returns whenever it likes.
+.\" ------------------------------------------------------------
+.Sh EXAMPLES
+The simplest (and, in some cases, the best) implementation of
+.Fn cpu_idle
+is the following.
+.Bd -literal
+	void
+	cpu_idle(void)
+	{
+		/* nothing */
+	}
+.Ed
+.\" ------------------------------------------------------------
+.Sh SEE ALSO
+.Xr intro 9
diff --git a/share/man/man9/cpu_switchto.9 b/share/man/man9/cpu_switchto.9
new file mode 100644
index 000000000000..5f7da9966fc0
--- /dev/null
+++ b/share/man/man9/cpu_switchto.9
@@ -0,0 +1,85 @@
+.\"	$NetBSD: cpu_switchto.9,v 1.1 2007/02/17 16:23:08 yamt Exp $
+.\"
+.\" Copyright (c)2007 YAMAMOTO Takashi,
+.\" 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 AUTHOR 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 AUTHOR 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 February 17, 2007
+.Dt CPU_SWITCHTO 9
+.Os
+.\" ------------------------------------------------------------
+.Sh NAME
+.Nm cpu_switchto
+.Nd machine-dependent LWP context switching interface
+.\" ------------------------------------------------------------
+.Sh SYNOPSIS
+.In sys/lwp.h
+.\" - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+.Ft struct lwp *
+.Fn cpu_switchto \
+"struct lwp *oldlwp" "struct lwp *newlwp"
+.\" ------------------------------------------------------------
+.Sh DESCRIPTION
+.Fn cpu_switchto
+saves the context of the LWP which is currenly running on the processor,
+and restores the context of the LWP specified by
+.Fa newlwp .
+.Pp
+.Fn cpu_switchto
+doesn't switch address spaces.
+.Fn cpu_switchto
+doesn't modify
+.Dv curlwp
+or
+.Dv curproc .
+.Pp
+It takes the following arguments.
+.Bl -tag -width oldlwp
+.It Fa oldlwp
+Specify the lwp from which we are going to switch, i.e.,
+the calling LWP.
+If it was
+.Dv NULL ,
+the context of the LWP currently running on this processor is not saved.
+.It Fa newlwp
+Specify the lwp to which we are going to switch.
+It must not be
+.Dv NULL .
+.El
+.\" ------------------------------------------------------------
+.Sh RETURN VALUES
+.Fn cpu_switchto
+does not return until another LWP calls
+.Fn cpu_switchto
+to switch to us.
+It returns an lwp from which we have been switched, i.e.,
+an LWP which called
+.Fa cpu_switchto
+to switch to us.
+.\" ------------------------------------------------------------
+.Sh SEE ALSO
+.Xr swapcontext 3 ,
+.Xr intro 9 ,
+.Xr mutex 9 ,
+.Xr spl 9