Index: head/stand/defaults/loader.conf.5
===================================================================
--- head/stand/defaults/loader.conf.5	(revision 338353)
+++ head/stand/defaults/loader.conf.5	(revision 338354)
@@ -1,341 +1,365 @@
 .\" Copyright (c) 1999 Daniel C. Sobral
 .\" 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.
 .\"
 .\" $FreeBSD$
-.Dd March 23, 2018
+.Dd August 28, 2018
 .Dt LOADER.CONF 5
 .Os
 .Sh NAME
 .Nm loader.conf
 .Nd "system bootstrap configuration information"
 .Sh DESCRIPTION
 The file
 .Nm
 contains descriptive information on bootstrapping the system.
 Through
 it you can specify the kernel to be booted, parameters to be passed to
 it, and additional modules to be loaded; and generally set all variables
 described in
 .Xr loader 8 .
 .Pp
 .Sh SYNTAX
 Though
 .Nm Ns 's
 format was defined explicitly to resemble
 .Xr rc.conf 5 ,
 and can be sourced by
 .Xr sh 1 ,
 some settings are treated in a special fashion.
 Also, the
 behavior of some settings is defined by the setting's suffix;
 the prefix identifies which module the setting controls.
 .Pp
 The general parsing rules are:
 .Bl -bullet
 .It
 Spaces and empty lines are ignored.
 .It
 A # sign will mark the remainder of the line as a comment.
 .It
 Only one setting can be present on each line.
 .El
 .Pp
 All settings have the following format:
 .Pp
 .Dl variable="value"
 .Pp
 Unless it belongs to one of the classes of settings that receive special
 treatment, a setting will set the value of a
 .Xr loader 8
 environment variable.
 The settings that receive special
 treatment are listed below.
 Settings beginning with
 .Qq *
 below define the modules to be loaded and
 may have any prefix; the prefix identifies a module.
 All such settings sharing a common
 prefix refer to the same module.
 .Bl -tag -width Ar
 .It Ar exec
 Immediately executes a
 .Xr loader 8
 command.
 This type of setting cannot be processed by programs other
 than
 .Xr loader 8 ,
 so its use should be avoided.
 Multiple instances of it will be processed
 independently.
 .It Ar loader_conf_files
 Defines additional configuration files to be processed right after the
 present file.
 .It Ar kernel
 Name of the kernel to be loaded.
 If no kernel name is set, no additional
 modules will be loaded.
 The name must be a subdirectory of
 .Pa /boot
 that contains a kernel.
 .It Ar kernel_options
 Flags to be passed to the kernel.
 .It Ar vfs.root.mountfrom
 Specify the root partition to mount.
 For example:
 .Pp
 .Dl vfs.root.mountfrom="ufs:/dev/da0s1a"
 .Pp
 .Xr loader 8
 automatically calculates the value of this tunable from
 .Pa /etc/fstab
 from the partition the kernel was loaded from.
 The calculated value might be calculated incorrectly when
 .Pa /etc/fstab
 is not available during
 .Xr loader 8
 startup (as during diskless booting from NFS), or if a different
 device is desired by the user.
 The preferred value can be set in
 .Pa /loader.conf .
 .Pp
 The value can also be overridden from the
 .Xr loader 8
 command line.
 This is useful for system recovery when
 .Pa /etc/fstab
 is damaged, lost, or read from the wrong partition.
 .It Ar password
 Protect boot menu with a password without interrupting
 .Ic autoboot
 process.
 The password should be in clear text format.
 If a password is set, boot menu will not appear until any key is pressed during
 countdown period specified by
 .Va autoboot_delay
 variable or
 .Ic autoboot
 process fails.
 In both cases user should provide specified password to be able to access boot
 menu.
 .It Ar bootlock_password
 Provides a password to be required by check-password before execution is
 allowed to continue.
 The password should be in clear text format.
 If a password is set, the user must provide specified password to boot.
 .It Ar verbose_loading
 If set to
 .Dq YES ,
 module names will be displayed as they are loaded.
 .It Ar *_load
 If set to
 .Dq YES ,
 that module will be loaded.
 If no name is defined (see below), the
 module's name is taken to be the same as the prefix.
 .It Ar *_name
 Defines the name of the module.
 .It Ar *_type
 Defines the module's type.
 If none is given, it defaults to a kld module.
 .It Ar *_flags
 Flags and parameters to be passed to the module.
 .It Ar *_before
 Commands to be executed before the module is loaded.
 Use of this setting
 should be avoided.
 .It Ar *_after
 Commands to be executed after the module is loaded.
 Use of this setting
 should be avoided.
 .It Ar *_error
 Commands to be executed if the loading of a module fails.
 Except for the
 special value
 .Dq abort ,
 which aborts the bootstrap process, use of this setting should be avoided.
 .El
 .Pp
 .Em WARNING:
 developers should never use these suffixes for any kernel environment
 variables (tunables) or conflicts will result.
 .Sh DEFAULT SETTINGS
 Most of
 .Nm Ns 's
 default settings can be ignored.
 The few of them which are important
 or useful are:
 .Bl -tag -width bootfile -offset indent
 .It Va bitmap_load
 .Pq Dq NO
 If set to
 .Dq YES ,
 a bitmap will be loaded to be displayed on screen while booting.
 .It Va bitmap_name
 .Pq Dq Pa /boot/splash.bmp
 Name of the bitmap to be loaded.
 Any other name can be used.
 .It Va comconsole_speed
 .Dq ( 9600
 or the value of the
 .Va BOOT_COMCONSOLE_SPEED
 variable when
 .Xr loader 8
 was compiled).
 Sets the speed of the serial console.
 If the previous boot loader stage specified that a serial console
 is in use then the default speed is determined from the current
 serial port speed setting.
 .It Va console
 .Pq Dq vidconsole
 .Dq comconsole
 selects serial console,
 .Dq vidconsole
 selects the video console,
 .Dq nullconsole
 selects a mute console
 (useful for systems with neither a video console nor a serial port), and
 .Dq spinconsole
 selects the video console which prevents any input and hides all output
 replacing it with
 .Dq spinning
 character (useful for embedded products and such).
 .It Va efi_max_resolution
 Specify the maximum desired resolution for the EFI console.
 The following values are accepted:
 .Bl -column "WidthxHeight"
 .It Sy Value Ta Sy Resolution
 .It 480p Ta 640x480
 .It 720p Ta 1280x720
 .It 1080p Ta 1920x1080
 .It 2160p Ta 3840x2160
 .It 4k Ta 3840x2160
 .It 5k Ta 5120x2880
 .It Va Width Ns x Ns Va Height Ta Va Width Ns x Ns Va Height
 .El
 .It Va kernel
 .Pq Dq kernel
 .It Va kernels
 .Pq Dq kernel kernel.old
 Space or comma separated list of kernels to present in the boot menu.
 .It Va loader_conf_files
 .Pq Dq Pa /boot/loader.conf /boot/loader.conf.local
 .It Va splash_bmp_load
 .Pq Dq NO
 If set to
 .Dq YES ,
 will load the splash screen module, making it possible to display a bmp image
 on the screen while booting.
 .It Va splash_pcx_load
 .Pq Dq NO
 If set to
 .Dq YES ,
 will load the splash screen module, making it possible to display a pcx image
 on the screen while booting.
 .It Va vesa_load
 .Pq Dq NO
 If set to
 .Dq YES ,
 the vesa module will be loaded, enabling bitmaps above VGA resolution to
 be displayed.
 .It Va beastie_disable
 If set to
 .Dq YES ,
 the beastie boot menu will be skipped.
 .It Va loader_logo Pq Dq Li orbbw
 Selects a desired logo in the beastie boot menu.
 Possible values are:
 .Dq Li orbbw ,
 .Dq Li orb ,
 .Dq Li fbsdbw ,
 .Dq Li beastiebw ,
 .Dq Li beastie ,
 and
 .Dq Li none .
 .It Va loader_color
 If set to
 .Dq NO ,
 the beastie boot menu will be displayed without ANSI coloring.
 .It Va entropy_cache_load
 .Pq Dq YES
 If set to
 .Dq NO ,
 the very early
 boot-time entropy file
 will not be loaded.
 See the entropy entries in
 .Xr rc.conf 5 .
 .It Va entropy_cache_name
 .Pq Dq /boot/entropy
 The name of the very early
 boot-time entropy cache file.
+.It Va cpu_microcode_load
+.Pq Dq NO
+If set to
+.Dq YES ,
+the microcode update file specified by
+.Va cpu_microcode_name
+will be loaded and applied very early during boot.
+This provides functionality similar to
+.Xr cpucontrol 8
+but ensures that CPU features enabled by microcode updates can be
+used by the kernel.
+The update will be re-applied automatically when resuming from an
+ACPI sleep state.
+If the update file contains updates for multiple processor models,
+the kernel will search for and extract a matching update.
+Currently this setting is supported only on Intel
+.Dv i386
+and
+.Dv amd64
+processors.
+It has no effect on other processor types.
+.It Va cpu_microcode_name
+A path to a microcode update file.
 .El
 .Sh OTHER SETTINGS
 Other settings that may be used in
 .Nm
 that have no default value:
 .Bl -tag -width bootfile -offset indent
 .It Va fdt_overlays
 Specifies a comma-delimited list of FDT overlays to apply.
 .Pa /boot/dtb/overlays
 is created by default for overlays to be placed in.
 .It Va kernels_autodetect
 If set to
 .Dq YES ,
 attempt to auto-detect kernels installed in
 .Pa /boot .
 This is an option specific to the Lua-based loader.
 It is not available in the default Forth-based loader.
 .El
 .Sh FILES
 .Bl -tag -width /boot/defaults/loader.conf -compact
 .It Pa /boot/defaults/loader.conf
 default settings -- do not change this file.
 .It Pa /boot/loader.conf
 user defined settings.
 .It Pa /boot/loader.conf.local
 machine-specific settings for sites with a common loader.conf.
 .El
 .Sh SEE ALSO
 .Xr rc.conf 5 ,
 .Xr boot 8 ,
+.Xr cpucontrol 8 ,
 .Xr loader 8 ,
 .Xr loader.4th 8
 .Sh HISTORY
 The file
 .Nm
 first appeared in
 .Fx 3.2 .
 .Sh AUTHORS
 This manual page was written by
 .An Daniel C. Sobral Aq dcs@FreeBSD.org .
 .Sh BUGS
 The
 .Xr loader 8
 stops reading
 .Nm
 when it encounters a syntax error, so any options which are vital for
 booting a particular system (i.e.\&
 .Dq Va hw.ata.ata_dma Ns "=0" )
 should precede any experimental additions to
 .Nm .