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-.\" Copyright (c) 2003 Joseph Koshy
-.\"
-.\" 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd December 3, 2005
-.Dt CONFIG 5
-.Os
-.Sh NAME
-.Nm config
-.Nd kernel configuration file format
-.Sh DESCRIPTION
-A kernel configuration file specifies the configuration of a
-.Fx
-kernel.
-It is processed by
-.Xr config 8
-to create a build environment where a kernel may be built using
-.Xr make 1 .
-.Ss Lexical Structure
-A kernel configuration file comprises a sequence of specification
-directives.
-.Pp
-A specification directive starts with a keyword at the beginning
-of the line and is followed by additional parameters.
-.Pp
-A specification directive may be terminated by a semicolon
-.Ql \&;
-or by a newline.
-Long input lines may be broken into shorter lines by starting the
-second and subsequent lines with a white space character.
-.Pp
-Case is significant,
-.Dq Li machine
-and
-.Dq Li MACHINE
-are different tokens.
-.Pp
-A double quote character
-.Ql \[dq]
-starts a quoted string.
-All characters up to the next quote character form the value
-of the quoted string.
-A
-.Ql \[dq]
-character may be inserted into a quoted string by
-using the sequence
-.Ql \e\[dq] .
-.Pp
-Numbers are specified using
-.Tn C Ns -style
-syntax.
-.Pp
-A
-.Ql #
-character starts a comment; all characters from the
-.Ql #
-character till the end of the current line are ignored.
-.Pp
-Whitespace between tokens is ignored, except inside quoted strings.
-Whitespace following a comment line is ignored.
-.Ss Configuration Directives
-Kernel configuration directives may appear in any order
-in a kernel configuration file.
-Directives are processed in order of appearance with subsequent
-directive lines overriding the effect of prior ones.
-.Pp
-The list of keywords and their meanings are as follows:
-.Bl -tag -width indent -compact
-.\" -------- CPU --------
-.Pp
-.It Ic cpu Ar cputype
-Specify the CPU this kernel will run on.
-There can be more than one
-.Ic cpu
-directive in a configuration file.
-The allowed list of CPU names is architecture specific and is
-defined in the file
-.Pa sys/conf/options. Ns Aq Ar arch .
-.\" -------- DEVICE --------
-.Pp
-.It Ic device Ar name Op , Ar name Op ...
-.It Ic devices Ar name Op , Ar name Op ...
-Configures the specified devices
-for inclusion into the kernel image.
-Devices that are common to all architectures are
-defined in the file
-.Pa sys/conf/files .
-Devices that are specific to architecture
-.Ar arch
-are defined in the file
-.Pa sys/conf/files. Ns Aq Ar arch .
-.\" -------- ENV --------
-.Pp
-.It Ic env Ar filename
-Specifies a filename containing a kernel environment definition.
-The kernel normally uses an environment prepared for it at boot time
-by
-.Xr loader 8 .
-This directive makes the kernel ignore the boot environment and use
-the compiled-in environment instead.
-.Pp
-This directive is useful for setting kernel tunables in
-embedded environments that do not start from
-.Xr loader 8 .
-.\" -------- FILES --------
-.Pp
-.It Ic files Ar filename
-Specifies a file containing a list of files specific to that kernel
-configuration file (a la
-.Pa files. Ns Aq Ar arch ) .
-.\" -------- HINTS --------
-.Pp
-.It Ic hints Ar filename
-Specifies a file to load a static device configuration specification
-from.
-From
-.Fx 5.0
-onwards, the kernel reads the system's device configuration at boot
-time (see
-.Xr device.hints 5 ) .
-This directive configures the kernel to use the static device configuration
-listed in
-.Ar filename .
-The file
-.Ar filename
-must conform to the syntax specified by
-.Xr device.hints 5 .
-.\" -------- IDENT --------
-.Pp
-.It Ic ident Ar name
-Set the kernel name to
-.Ar name .
-At least one
-.Ic ident
-directive is required.
-.\" -------- INCLUDE --------
-.Pp
-.It Ic include Ar filename
-Read subsequent text from file
-.Ar filename
-and return to the current file after
-.Ar filename
-is successfully processed.
-.\" -------- MACHINE --------
-.Pp
-.It Ic machine Ar arch
-Specifies the architecture of the machine the kernel is being
-compiled for.
-Legal values for
-.Ar arch
-include:
-.Pp
-.Bl -tag -width ".Cm powerpc" -compact
-.It Cm alpha
-The DEC Alpha architecture.
-.It Cm amd64
-The AMD x86-64 architecture.
-.It Cm i386
-The Intel x86 based PC architecture.
-.It Cm ia64
-The Intel IA64 architecture.
-.It Cm pc98
-The PC98 architecture.
-.It Cm powerpc
-The IBM PowerPC architecture.
-.It Cm sparc64
-The Sun Sparc64 architecture.
-.El
-.Pp
-A kernel configuration file may have only one
-.Ic machine
-directive.
-.\" -------- MAKEOPTION --------
-.Pp
-.It Ic makeoption Ar options
-.It Ic makeoptions Ar options
-Add
-.Ar options
-to the generated makefile.
-.Pp
-The
-.Ar options
-argument is a comma separated list of one or more option
-specifications.
-Each option specification has the form
-.Pp
-.D1 Ar MakeVariableName Ns Op = Ns Ar Value
-.Pp
-and results in the appropriate
-.Xr make 1
-variable definition being inserted into the generated makefile.
-If only the name of the
-.Xr make 1
-variable is specified,
-.Ar value
-is assumed to be the empty string.
-.Pp
-Example:
-.Bd -literal -offset indent -compact
-makeoptions MYMAKEOPTION="foobar"
-makeoptions MYNULLMAKEOPTION
-.Ed
-.\" -------- MAXUSERS --------
-.Pp
-.It Ic maxusers Ar number
-This optional directive is used to configure the size
-of some kernel data structures.
-The parameter
-.Ar number
-can be 0 (the default) or an integer greater than or equal to 2.
-A value of 0 indicates that the kernel should configure
-its data structures according to the size of available
-physical memory.
-If auto configuration is requested, the kernel will set
-this tunable to a value between 32 and 384.
-.Pp
-As explained in
-.Xr tuning 7 ,
-this tunable can also be set at boot time using
-.Xr loader 8 .
-.\" -------- NOCPU --------
-.Pp
-.It Ic nocpu Ar cputype
-Remove the specified CPU
-from the list of previously selected CPUs.
-This directive can be used to cancel the effect of
-.Ic cpu
-directives in files included using
-.Ic include .
-.\" -------- NODEVICE --------
-.Pp
-.It Ic nodevice Ar name Op , Ar name Op ...
-.It Ic nodevices Ar name Op , Ar name Op ...
-Remove the specified devices
-from the list of previously selected devices.
-This directive can be used to cancel the effects of
-.Ic device
-or
-.Ic devices
-directives in files included using
-.Ic include .
-.\" -------- NOMAKEOPTION --------
-.Pp
-.It Ic nomakeoption Ar name
-.It Ic nomakeoptions Ar name
-Removes previously defined
-.Xr make 1
-option
-.Ar name
-from the kernel build.
-This directive can be used to cancel the effects of
-.Ic makeoption
-directives in files included using
-.Ic include .
-.\" -------- NOOPTION --------
-.Pp
-.It Ic nooption Ar name Op , Ar name Op ...
-.It Ic nooptions Ar name Op , Ar name Op ...
-Remove the specified kernel options
-from the list of previously defined options.
-This directive can be used to cancel the effects of
-.Ic option
-or
-.Ic options
-directives in files included using
-.Ic include .
-.\" -------- OPTIONS --------
-.Pp
-.It Ic option Ar optionspec Op , Ar optionspec Op ...
-.It Ic options Ar optionspec Op , Ar optionspec Op ...
-Add compile time kernel options to the kernel build.
-Each option specification has the form
-.Pp
-.D1 Ar name Ns Op = Ns Ar value
-.Pp
-If
-.Ar value
-is not specified, it is assumed to be
-.Dv NULL .
-Options common to all architectures are specified in
-the file
-.Pa sys/conf/options .
-Options specific to architecture
-.Ar arch
-are specified in the file
-.Pa sys/conf/options. Ns Aq Ar arch .
-.\" -------- PROFILE --------
-.Pp
-.It Ic profile Ar number
-Enables kernel profiling if
-.Ar number
-is non-zero.
-If
-.Ar number
-is 2 or greater, the kernel is configured for
-high-resolution profiling.
-Kernels can also be built for profiling using the
-.Fl p
-option to
-.Xr config 8 .
-.El
-.Ss Obsolete Directives
-The following kernel configuration directives are obsolete.
-.Bl -tag -width indent
-.\" -------- CONFIG --------
-.Pp
-.It Ic config
-This directive was used to specify the device to be used for the root
-file system.
-From
-.Fx 4.0
-onwards, this information is passed to a booting kernel by
-.Xr loader 8 .
-.El
-.Sh FILES
-.Bl -tag -width ".Pa sys/conf/Makefile. Ns Ar arch" -compact
-.It Pa sys/compile/ Ns Ar NAME
-Compile directory created from a kernel configuration.
-.It Pa sys/conf/Makefile. Ns Ar arch
-.Pa Makefile
-fragments for architecture
-.Ar arch .
-.It Pa sys/conf/files
-Devices common to all architectures.
-.It Pa sys/conf/files. Ns Ar arch
-Devices for architecture
-.Ar arch .
-.It Pa sys/conf/options
-Options common to all architectures.
-.It Pa sys/conf/options. Ns Ar arch
-Options for architecture
-.Ar arch .
-.El
-.Sh SEE ALSO
-.Xr kenv 1 ,
-.Xr make 1 ,
-.Xr device.hints 5 ,
-.Xr loader.conf 5 ,
-.Xr config 8 ,
-.Xr kldload 8 ,
-.Xr loader 8
-.Rs
-.%T "Building 4.4BSD Kernels with Config"
-.%A "Samuel J. Leffler"
-.%A "Michael J. Karels"
-.Re
-.Sh HISTORY
-The
-.Xr config 8
-utility first appeared in
-.Bx 4.1 ,
-and was subsequently revised in
-.Bx 4.4 .
-.Pp
-The kernel configuration mechanism changed further in
-.Fx 4.0
-and
-.Fx 5.0 ,
-moving toward an architecture supporting dynamic kernel
-configuration.