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CORE.LUA(8) System Manager's Manual CORE.LUA(8) NAME core.lua -- bootloader core module DESCRIPTION core.lua contains core functionality that does not have a more fitting mod- ule. Before hooking into or using the functionality provided by core.lua, it must be included with a statement such as the following: local core = require("core") CONSTANTS The following raw key code constants are defined in core.lua: KEY_BACKSPACE The backspace code. Should generally be checked along with KEY_DELETE for backspace functionality. KEY_ENTER The enter key, or hard return. KEY_DELETE The delete code. Should generally be checked along with KEY_BACKSPACE for backspace functionality. The following key-string constants are defined in core.lua: KEYSTR_ESCAPE The escape key. KEYSTR_CSI The ANSI CSI sequence. The following menu entry type constants are defined in core.lua: MENU_RETURN Return to the parent menu. MENU_ENTRY A normal menu entry. MENU_SEPARATOR A menu entry that serves as a separator. MENU_SUBMENU A menu entry that opens a submenu when selected. MENU_CAROUSEL_ENTRY A menu entry that rotates through items like a carousel upon selection of the menu entry. Please see menu.lua(8) for extended descriptions and usage of the MENU_* constants. Exported functions The following functions are exported from core.lua: core.setVerbose(verbose) Sets or unsets boot_verbose. If verbose is omit- ted, toggle the current verbose setting. core.setSingleUser(singleUser) Sets or unsets boot_single. If singleUser is omitted, toggle the current single user setting. core.getACPI() Return true if ACPI is both present and not ex- plicitly disabled by hints.acpi.0.disabled. core.hasACPI() Checks whether ACPI support is present. This re- quires the loader to probe the system and set acpi.rsdp early before starting the interpreter. core.setACPI(acpi) Sets or unsets acpi_load, hint.acpi.0.disabled, and loader.acpi_disabled_by_user. If acpi is omitted, toggle the current ACPI setting. core.setSafeMode(safeMode) Set the safe mode setting. Sets or unsets kern.smp.disabled, hw.ata.ata_dma, hw.ata.atapi_dma, kern.eventtimer.periodic, and kern.geom.part.check_integrity. If safeMode is omitted, toggle the current safe mode setting. core.clearCachedKernels() Clears out the cache of kernels to be displayed on the boot menu. This function is registered as a config.reloaded hook. It is used to invalidate the kernel list whenever it may have changed, ei- ther due to a boot environment change or a poten- tial change in either kernel or kernels. core.hasFeature(featureName) Checks whether the named featureName is enabled in the current loader. This is specifically used for detecting capabilities of the loaded loader binary, so that one can reasonably implement backwards compatibility shims if needed. core.kernelList() Returns a table of kernels to display on the boot menu. This will combine kernel and kernels from loader.conf(5). If kernels_autodetect is set in loader.conf(5), kernels will be autodetected from the current system. core.bootenvDefault() Returns the default boot environment, nil if un- set. core.bootenvFilter(func) Installs a filter func into core.bootenvList(). If the func returns true, then the boot environ- ment is retained in the list. Otherwise, the boot environment is hidden. The old filter, if any, is returned to allow the caller to compose a filter on top of another filter. core.bootenvList() Returns a table of boot environments, or an empty table. These will be picked up using the bootenvs and bootenvs_count variables set by loader(8). core.setDefaults() Resets ACPI, safe mode, single user, and verbose settings to their system defauilts. core.autoboot(argstr) Loads the kernel and specified modules, then in- vokes the autoboot loader(8) command with argstr as-is. core.boot(argstr) Loads the kernel and specified modules, then in- vokes the boot loader(8) command with argstr as- is. core.isSingleUserBoot() Returns true if boot_single is set to yes. core.isZFSBoot() Returns true if currdev is set to a zfs(8) dataset. core.isSerialBoot() Returns true if we are booting over serial. This checks console, boot_serial, and boot_multicons. core.deepCopyTable(tbl) Recursively deep copies tbl and returns the re- sult. core.popFrontTable(tbl) Pops the front element off of tbl, and returns two return values: the front element, and the rest of the table. If there are no elements, this returns nil and nil. If there is one ele- ment, this returns the front element and an empty table. This will not operate on truly associa- tive tables; numeric indices are required. core.loaderTooOld() Returns true if the loader is too old. Specifi- cally, this means, is the loader old enough to require one or more workarounds in the current lua base modules. SEE ALSO loader.conf(5), loader(8), menu.lua(8) AUTHORS The core.lua file was originally written by Pedro Souza <pe- drosouza@FreeBSD.org>. Later work and this manual page was done by Kyle Evans <kevans@FreeBSD.org>. FreeBSD ports 15.quarterly April 8, 2026 CORE.LUA(8)
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