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1631382cf2
liblua now provides a loader.has_feature() function to probe the loader
binary for features advertised. name => desc mappings are provided in
loader.features to get a list of all of the features loader *can*
support. core.hasFeature is provided as a shim to loader.has_feature
so that individual consumers don't need to think about the logic of the
loader module not providing has_feature; we know that means the feature
isn't enabled.
The first consumer of this will be EARLY_ACPI to advertise that the
loader binary probes for ACPI presence before the interpreter has
started, so that we know whether we can trust the presence of acpi.rsdp
as relatively authoritative. In general, it's intended to be used to
avoid breaking new scripts on older loaders within reason.
This will be used in lua as `core.hasFeature("EARLY_ACPI")`, while the
C bits of loader will `feature_enable(FEATURE_EARLY_ACPI)`.
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D42695
233 lines
6.4 KiB
Groff
233 lines
6.4 KiB
Groff
.\"
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.\" SPDX-License-Identifier: BSD-2-Clause
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.\"
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.\" Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd December 8, 2023
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.Dt CORE.LUA 8
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.Os
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.Sh NAME
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.Nm core.lua
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.Nd FreeBSD core module
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.Sh DESCRIPTION
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.Nm
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contains core functionality that does not have a more fitting module.
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.Pp
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Before hooking into or using the functionality provided by
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.Nm ,
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it must be included with a statement such as the following:
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.Pp
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.Dl local core = require("core")
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.Ss CONSTANTS
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The following raw key code constants are defined in
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.Nm :
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.Bl -tag -width KEY_BACKSPACE -compact -offset indent
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.It Ic KEY_BACKSPACE
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The backspace code.
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Should generally be checked along with
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.Ic KEY_DELETE
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for backspace functionality.
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.It Ic KEY_ENTER
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The enter key, or hard return.
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.It Ic KEY_DELETE
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The delete code.
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Should generally be checked along with
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.Ic KEY_BACKSPACE
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for backspace functionality.
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.El
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.Pp
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The following key-string constants are defined in
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.Nm :
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.Bl -tag -width KEYSTR_ESCAPE -compact -offset indent
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.It Ic KEYSTR_ESCAPE
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The escape key.
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.It Ic KEYSTR_CSI
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The ANSI CSI sequence.
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.El
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.Pp
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The following menu entry type constants are defined in
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.Nm :
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.Bl -tag -width MENU_CAROUSEL_ENTRY -compact -offset indent
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.It Ic MENU_RETURN
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Return to the parent menu.
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.It Ic MENU_ENTRY
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A normal menu entry.
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.It Ic MENU_SEPARATOR
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A menu entry that serves as a separator.
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.It Ic MENU_SUBMENU
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A menu entry that opens a submenu when selected.
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.It Ic MENU_CAROUSEL_ENTRY
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A menu entry that rotates through items like a carousel upon selection of the
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menu entry.
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.El
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.Pp
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Please see
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.Xr menu.lua 8
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for extended descriptions and usage of the
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.Ic MENU_*
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constants.
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.Ss Exported functions
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The following functions are exported from
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.Nm :
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.Bl -tag -width core.setSingleUser -offset indent
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.It Fn core.setVerbose verbose
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Sets or unsets
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.Ev boot_verbose .
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If
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.Fa verbose
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is omitted, toggle the current verbose setting.
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.It Fn core.setSingleUser singleUser
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Sets or unsets
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.Ev boot_single .
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If
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.Fa singleUser
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is omitted, toggle the current single user setting.
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.It Fn core.getACPI
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Return true if ACPI is both present and not explicitly disabled by
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.Ev hints.acpi.0.disabled .
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.It Fn core.hasACPI
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Checks whether ACPI support is present.
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This requires the loader to probe the system and set
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.Ev acpi.rsdp
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early before starting the interpreter.
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.It Fn core.setACPI acpi
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Sets or unsets
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.Ev acpi_load ,
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.Ev hint.acpi.0.disabled ,
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and
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.Ev loader.acpi_disabled_by_user .
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If
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.Fa acpi
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is omitted, toggle the current ACPI setting.
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.It Fn core.setSafeMode safeMode
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Set the safe mode setting.
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Sets or unsets
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.Ev kern.smp.disabled ,
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.Ev hw.ata.ata_dma ,
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.Ev hw.ata.atapi_dma ,
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.Ev kern.eventtimer.periodic ,
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and
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.Ev kern.geom.part.check_integrity .
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If
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.Fa safeMode
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is omitted, toggle the current safe mode setting.
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.It Fn core.clearCachedKernels
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Clears out the cache of kernels to be displayed on the boot menu.
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This function is registered as a
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.Ev config.reloaded
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hook.
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It is used to invalidate the kernel list whenever it may have changed, either
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due to a boot environment change or a potential change in either
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.Ic kernel
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or
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.Ic kernels .
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.It Fn core.hasFeature featureName
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Checks whether the named
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.Fa featureName
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is enabled in the current loader.
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This is specifically used for detecting capabilities of the loaded loader
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binary, so that one can reasonably implement backwards compatibility shims if
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needed.
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.It Fn core.kernelList
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Returns a table of kernels to display on the boot menu.
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This will combine
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.Ic kernel
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and
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.Ic kernels
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from
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.Xr loader.conf 5 .
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If
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.Ic kernels_autodetect
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is set in
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.Xr loader.conf 5 ,
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kernels will be autodetected from the current system.
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.It Fn core.bootenvDefault
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Returns the default boot environment, nil if unset.
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.It Fn core.bootenvList
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Returns a table of boot environments, or an empty table.
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These will be picked up using the
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.Ev bootenvs
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and
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.Ev bootenvs_count
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variables set by
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.Xr loader 8 .
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.It Fn core.setDefaults
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Resets ACPI, safe mode, single user, and verbose settings to their system
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defauilts.
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.It Fn core.autoboot argstr
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Loads the kernel and specified modules, then invokes the
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.Ic autoboot
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.Xr loader 8
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command with
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.Fa argstr
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as-is.
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.It Fn core.boot argstr
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Loads the kernel and specified modules, then invokes the
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.Ic boot
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.Xr loader 8
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command with
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.Fa argstr
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as-is.
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.It Fn core.isSingleUserBoot
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Returns true if
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.Ev boot_single
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is set to yes.
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.It Fn core.isZFSBoot
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Returns true if
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.Ev currdev
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is set to a
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.Xr zfs 8
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dataset.
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.It Fn core.isSerialBoot
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Returns true if we are booting over serial.
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This checks
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.Ev console ,
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.Ev boot_serial ,
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and
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.Ev boot_multicons .
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.It Fn core.deepCopyTable tbl
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Recursively deep copies
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.Fa tbl
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and returns the result.
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.It Fn core.popFrontTable tbl
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Pops the front element off of
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.Fa tbl ,
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and returns two return values: the front element, and the rest of the table.
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If there are no elements, this returns nil and nil.
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If there is one element, this returns the front element and an empty table.
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This will not operate on truly associative tables; numeric indices are
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required.
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.El
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.Sh SEE ALSO
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.Xr loader.conf 5 ,
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.Xr loader 8 ,
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.Xr menu.lua 8
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.Sh AUTHORS
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The
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.Nm
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file was originally written by
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.An Pedro Souza Aq Mt pedrosouza@FreeBSD.org .
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Later work and this manual page was done by
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.An Kyle Evans Aq Mt kevans@FreeBSD.org .
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