305 lines
9.4 KiB
Nix
305 lines
9.4 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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kernel = config.boot.kernelPackages.kernel;
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kernelModulesConf = pkgs.writeText "nixos.conf"
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''
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${concatStringsSep "\n" config.boot.kernelModules}
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'';
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in
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{
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###### interface
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options = {
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boot.kernelPackages = mkOption {
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default = pkgs.linuxPackages;
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# We don't want to evaluate all of linuxPackages for the manual
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# - some of it might not even evaluate correctly.
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defaultText = "pkgs.linuxPackages";
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example = "pkgs.linuxPackages_2_6_25";
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description = ''
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This option allows you to override the Linux kernel used by
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NixOS. Since things like external kernel module packages are
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tied to the kernel you're using, it also overrides those.
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This option is a function that takes Nixpkgs as an argument
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(as a convenience), and returns an attribute set containing at
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the very least an attribute <varname>kernel</varname>.
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Additional attributes may be needed depending on your
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configuration. For instance, if you use the NVIDIA X driver,
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then it also needs to contain an attribute
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<varname>nvidia_x11</varname>.
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'';
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};
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boot.kernelParams = mkOption {
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default = [ ];
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description = ''
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The kernel parameters. If you want to add additional
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parameters, it's best to set
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<option>boot.extraKernelParams</option>.
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'';
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};
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boot.extraKernelParams = mkOption {
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default = [ ];
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example = [ "boot.trace" ];
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description = "Additional user-defined kernel parameters.";
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};
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boot.consoleLogLevel = mkOption {
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type = types.int;
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default = 4;
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description = ''
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The kernel console log level. Only log messages with a
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priority numerically less than this will appear on the
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console.
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'';
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};
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boot.vesa = mkOption {
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default = false;
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description = ''
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Whether to activate VESA video mode on boot.
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'';
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};
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boot.extraModulePackages = mkOption {
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default = [];
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# !!! example = [pkgs.nvidia_x11];
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description = "A list of additional packages supplying kernel modules.";
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};
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boot.kernelModules = mkOption {
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default = [];
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description = ''
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The set of kernel modules to be loaded in the second stage of
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the boot process. Note that modules that are needed to
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mount the root file system should be added to
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<option>boot.initrd.availableKernelModules</option> or
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<option>boot.initrd.kernelModules</option>.
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'';
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};
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boot.initrd.availableKernelModules = mkOption {
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default = [];
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example = [ "sata_nv" "ext3" ];
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description = ''
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The set of kernel modules in the initial ramdisk used during the
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boot process. This set must include all modules necessary for
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mounting the root device. That is, it should include modules
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for the physical device (e.g., SCSI drivers) and for the file
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system (e.g., ext3). The set specified here is automatically
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closed under the module dependency relation, i.e., all
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dependencies of the modules list here are included
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automatically. The modules listed here are available in the
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initrd, but are only loaded on demand (e.g., the ext3 module is
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loaded automatically when an ext3 filesystem is mounted, and
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modules for PCI devices are loaded when they match the PCI ID
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of a device in your system). To force a module to be loaded,
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include it in <option>boot.initrd.kernelModules</option>.
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'';
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};
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boot.initrd.kernelModules = mkOption {
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default = [];
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description = "List of modules that are always loaded by the initrd.";
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};
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system.modulesTree = mkOption {
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internal = true;
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default = [];
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description = ''
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Tree of kernel modules. This includes the kernel, plus modules
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built outside of the kernel. Combine these into a single tree of
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symlinks because modprobe only supports one directory.
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'';
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merge = mergeListOption;
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# Convert the list of path to only one path.
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apply = pkgs.aggregateModules;
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};
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system.requiredKernelConfig = mkOption {
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default = [];
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example = literalExample ''
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with config.lib.kernelConfig; [
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(isYes "MODULES")
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(isEnabled "FB_CON_DECOR")
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(isEnabled "BLK_DEV_INITRD")
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]
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'';
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internal = true;
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type = types.listOf types.attrs;
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description = ''
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This option allows modules to specify the kernel config options that
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must be set (or unset) for the module to work. Please use the
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lib.kernelConfig functions to build list elements.
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'';
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};
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};
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###### implementation
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config = {
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system.build = { inherit kernel; };
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system.modulesTree = [ kernel ] ++ config.boot.extraModulePackages;
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# Implement consoleLogLevel both in early boot and using sysctl
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# (so you don't need to reboot to have changes take effect).
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boot.kernelParams =
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[ "loglevel=${toString config.boot.consoleLogLevel}" ] ++
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optionals config.boot.vesa [ "vga=0x317" ];
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boot.kernel.sysctl."kernel.printk" = config.boot.consoleLogLevel;
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boot.kernelModules = [ "loop" ];
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boot.initrd.availableKernelModules =
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[ # Note: most of these (especially the SATA/PATA modules)
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# shouldn't be included by default since nixos-hardware-scan
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# detects them, but I'm keeping them for now for backwards
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# compatibility.
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# Some SATA/PATA stuff.
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"ahci"
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"sata_nv"
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"sata_via"
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"sata_sis"
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"sata_uli"
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"ata_piix"
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"pata_marvell"
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# Standard SCSI stuff.
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"sd_mod"
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"sr_mod"
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# Standard IDE stuff.
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"ide_cd"
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"ide_disk"
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"ide_generic"
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# Support USB keyboards, in case the boot fails and we only have
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# a USB keyboard.
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"uhci_hcd"
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"ehci_hcd"
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"ehci_pci"
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"ohci_hcd"
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"xhci_hcd"
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"usbhid"
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"hid_generic"
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# Unix domain sockets (needed by udev).
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"unix"
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# Misc. stuff.
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"pcips2" "xtkbd"
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# To wait for SCSI devices to appear.
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"scsi_wait_scan"
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];
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boot.initrd.kernelModules =
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[ # For LVM.
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"dm_mod"
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];
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# The Linux kernel >= 2.6.27 provides firmware.
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hardware.firmware = [ "${kernel}/lib/firmware" ];
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# Create /etc/modules-load.d/nixos.conf, which is read by
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# systemd-modules-load.service to load required kernel modules.
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# FIXME: ensure that systemd-modules-load.service is restarted if
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# this file changes.
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environment.etc = singleton
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{ target = "modules-load.d/nixos.conf";
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source = kernelModulesConf;
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};
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# Sigh. This overrides systemd's systemd-modules-load.service
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# just so we can set a restart trigger. Also make
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# multi-user.target pull it in so that it gets started if it
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# failed earlier.
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systemd.services."systemd-modules-load" =
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{ description = "Load Kernel Modules";
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wantedBy = [ "sysinit.target" "multi-user.target" ];
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before = [ "sysinit.target" "shutdown.target" ];
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unitConfig =
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{ DefaultDependencies = "no";
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Conflicts = "shutdown.target";
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};
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serviceConfig =
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{ Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = "${config.systemd.package}/lib/systemd/systemd-modules-load";
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# Ignore failed module loads. Typically some of the
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# modules in ‘boot.kernelModules’ are "nice to have but
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# not required" (e.g. acpi-cpufreq), so we don't want to
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# barf on those.
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SuccessExitStatus = "0 1";
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};
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restartTriggers = [ kernelModulesConf ];
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};
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lib.kernelConfig = {
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isYes = option: {
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assertion = config: config.isYes option;
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message = "CONFIG_${option} is not yes!";
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configLine = "CONFIG_${option}=y";
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};
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isNo = option: {
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assertion = config: config.isNo option;
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message = "CONFIG_${option} is not no!";
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configLine = "CONFIG_${option}=n";
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};
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isModule = option: {
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assertion = config: config.isModule option;
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message = "CONFIG_${option} is not built as a module!";
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configLine = "CONFIG_${option}=m";
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};
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### Usually you will just want to use these two
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# True if yes or module
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isEnabled = option: {
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assertion = config: config.isEnabled option;
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message = "CONFIG_${option} is not enabled!";
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configLine = "CONFIG_${option}=y";
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};
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# True if no or omitted
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isDisabled = option: {
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assertion = config: config.isDisabled option;
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message = "CONFIG_${option} is not disabled!";
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configLine = "CONFIG_${option}=n";
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};
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};
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# The config options that all modules can depend upon
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system.requiredKernelConfig = with config.lib.kernelConfig; [
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# !!! Should this really be needed?
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(isYes "MODULES")
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(isYes "BINFMT_ELF")
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];
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# nixpkgs kernels are assumed to have all required features
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assertions = if config.boot.kernelPackages.kernel ? features then [] else
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let cfg = config.boot.kernelPackages.kernel.config; in map (attrs:
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{ assertion = attrs.assertion cfg; inherit (attrs) message; }
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) config.system.requiredKernelConfig;
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};
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}
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