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