diff --git a/share/man/man4/man4.x86/tprof_amdpmi.4 b/share/man/man4/man4.x86/tprof_amdpmi.4
new file mode 100644
index 000000000000..a64fda9b9846
--- /dev/null
+++ b/share/man/man4/man4.x86/tprof_amdpmi.4
@@ -0,0 +1,66 @@
+.\"	$NetBSD: tprof_amdpmi.4,v 1.1 2011/12/02 12:17:51 yamt Exp $
+.\"
+.\" Copyright (c)2011 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 December 2, 2011
+.Dt TPROF_AMDPMI 4
+.Os
+.\" ------------------------------------------------------------
+.Sh NAME
+.Nm tprof_amdpmi
+.Nd a tprof backend for AMD processors
+.\" ------------------------------------------------------------
+.Sh SYNOPSIS
+.Cd pseudo-device tprof_amdpmi
+.\" ------------------------------------------------------------
+.Sh DESCRIPTION
+The
+.Nm
+driver is a
+.Xr tprof 4
+backend driver, which uses performance-monitoring events available for
+some of AMD processors.
+.Pp
+It programs the processors so that "CPU Clocks not Halted" events
+(event select 0x76) to raise NMIs and the NMI handler collects
+a sample.
+.\" ------------------------------------------------------------
+.\".Sh EXAMPLES
+.\" ------------------------------------------------------------
+.Sh SEE ALSO
+.Xr tprof 4
+.\" ------------------------------------------------------------
+.\".Sh HISTORY
+.\"The
+.\".Nm
+.\"driver first appeared in
+.\".Nx 4.0 .
+.\" ------------------------------------------------------------
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An YAMAMOTO Takashi .
diff --git a/share/man/man4/man4.x86/tprof_pmi.4 b/share/man/man4/man4.x86/tprof_pmi.4
new file mode 100644
index 000000000000..0ef49b3fd0fe
--- /dev/null
+++ b/share/man/man4/man4.x86/tprof_pmi.4
@@ -0,0 +1,69 @@
+.\"	$NetBSD: tprof_pmi.4,v 1.1 2011/12/02 12:17:51 yamt Exp $
+.\"
+.\" Copyright (c)2011 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 December 2, 2011
+.Dt TPROF_PMI 4
+.Os
+.\" ------------------------------------------------------------
+.Sh NAME
+.Nm tprof_pmi
+.Nd a tprof backend for Intel Pentium 4
+.\" ------------------------------------------------------------
+.Sh SYNOPSIS
+.Cd pseudo-device tprof_pmi
+.\" ------------------------------------------------------------
+.Sh DESCRIPTION
+The
+.Nm
+driver is a
+.Xr tprof 4
+backend driver, which uses performance-monitoring events available for
+Intel Pentium 4 (NetBurst) processors.
+.Pp
+It programs the processors so that global_power_events events
+(ESCR Event Select = 0x13) to raise NMIs and the NMI handler collects
+a sample.
+.\" ------------------------------------------------------------
+.\".Sh EXAMPLES
+.\" ------------------------------------------------------------
+.Sh SEE ALSO
+.Xr tprof 4
+.\" ------------------------------------------------------------
+.\".Sh HISTORY
+.\"The
+.\".Nm
+.\"driver first appeared in
+.\".Nx 4.0 .
+.\" ------------------------------------------------------------
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An YAMAMOTO Takashi .
+.\" ------------------------------------------------------------
+.Sh BUGS
+The name of this driver is too generic.
diff --git a/share/man/man4/tprof.4 b/share/man/man4/tprof.4
new file mode 100644
index 000000000000..0284a49e807f
--- /dev/null
+++ b/share/man/man4/tprof.4
@@ -0,0 +1,71 @@
+.\"	$NetBSD: tprof.4,v 1.1 2011/12/02 12:17:51 yamt Exp $
+.\"
+.\" Copyright (c)2011 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 December 2, 2011
+.Dt TPROF 4
+.Os
+.\" ------------------------------------------------------------
+.Sh NAME
+.Nm tprof
+.Nd a sampling based profiler
+.\" ------------------------------------------------------------
+.Sh SYNOPSIS
+.Cd pseudo-device tprof
+.\" ------------------------------------------------------------
+.Sh DESCRIPTION
+The
+.Nm
+driver provides kernel services necessary for
+.Xr tprof 8 .
+.Pp
+Specifically, it makes its backend driver collect profiling samples and
+provide them to the userland consumer.
+.Pp
+The API/ABI is currently undocumented and will likely change in future
+without keeping compatibility.
+.\" ------------------------------------------------------------
+.\".Sh EXAMPLES
+.\" ------------------------------------------------------------
+.Sh SEE ALSO
+.Xr tprof_amdpmi 4 ,
+.Xr tprof_pmi 4
+.Xr tprof 8
+.\" ------------------------------------------------------------
+.\".Sh HISTORY
+.\"The
+.\".Nm
+.\"driver first appeared in
+.\".Nx 4.0 .
+.\" ------------------------------------------------------------
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An YAMAMOTO Takashi .
+.\" ------------------------------------------------------------
+.Sh BUGS
+There is no way to configure multiple backend drivers statically.