Index: share/man/man4/Makefile
===================================================================
--- share/man/man4/Makefile
+++ share/man/man4/Makefile
@@ -110,6 +110,7 @@
 	chromebook_platform.4 \
 	${_chvgpio.4} \
 	ciss.4 \
+	${_coredirector.4} \
 	${_coretemp.4} \
 	cp2112.4 \
 	${_cpuctl.4} \
@@ -797,6 +798,7 @@
 _bxe.4=		bxe.4
 _bytgpio.4=	bytgpio.4
 _chvgpio.4=	chvgpio.4
+_coredirector.4=	coredirector.4
 _coretemp.4=	coretemp.4
 _cpuctl.4=	cpuctl.4
 _dpms.4=	dpms.4
Index: share/man/man4/coredirector.4
===================================================================
--- /dev/null
+++ share/man/man4/coredirector.4
@@ -0,0 +1,79 @@
+.\"-
+.\" Copyright (c) 2024 Koine Yuusuke
+.\" 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 March 17, 2024
+.Dt COREDIRECTOR 4
+.Os
+.Sh NAME
+.Nm coredirector
+.Nd device driver for Intel Hardware Feedback Interface / Intel Thread Director
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device coredirector"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+coredirector_load="YES"
+.Ed
+.Pp
+Also, by setting the following option in the your
+kernel configuration file, the obtaioned value can
+be passed to the ULE scheduler.
+.Bd -ragged -offset indent
+.Cd "options CPUGRP_SCORE"
+.Ed
+.Pp
+However, currently no improvements to scheduling
+using the passed values have been implemented.
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for Intel Hardware Feedback
+Interface (HFI) / Intel Thread Director (ITD) in Intel
+Hybrid-Architecture CPUs.
+.Pp
+The
+.Nm
+driver reports each CPU core group's Performance /
+Efficiency parameter through a sysctl node, named
+.Va dev.coredirector.%d.hwtable .
+.Sh SEE ALSO
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+driver currently under development.
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Koine Yuusuke Aq Mt koinec@yahoo.co.jp .