nixpkgs/modules/system/boot/kernel.nix

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{pkgs, config, ...}:
###### interface
let
inherit (pkgs.lib) mkOption;
options = {
boot = {
kernelPackages = mkOption {
default = pkgs.kernelPackages;
example = pkgs.kernelPackages_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>.
";
};
kernelParams = mkOption {
default = [
"selinux=0"
"apm=on"
"acpi=on"
"vga=0x317"
"console=tty1"
"splash=verbose"
];
description = "
The kernel parameters. If you want to add additional
parameters, it's best to set
<option>boot.extraKernelParams</option>.
";
};
extraKernelParams = mkOption {
default = [
];
example = [
"debugtrace"
];
description = "
Additional user-defined kernel parameters.
";
};
extraModulePackages = mkOption {
default = [];
# !!! example = [pkgs.aufs pkgs.nvidia_x11];
description = ''
A list of additional packages supplying kernel modules.
'';
};
kernelModules = mkOption {
default = [];
description = "
The set of kernel modules to be loaded in the second stage of
the boot process. That is, these modules are not included in
the initial ramdisk, so they'd better not be required for
mounting the root file system. Add them to
<option>boot.initrd.extraKernelModules</option> if they are.
";
};
initrd = {
kernelModules = mkOption {
default = [
# 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"
# Filesystems.
"ext3"
# Support USB keyboards, in case the boot fails and we only have
# a USB keyboard.
"ehci_hcd"
"ohci_hcd"
"usbhid"
# LVM.
"dm_mod"
];
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. If you want to add additional
modules, it's best to set
<option>boot.initrd.extraKernelModules</option>.
";
};
extraKernelModules = mkOption {
default = [];
description = "
Additional kernel modules for the initial ramdisk. These are
loaded before the modules listed in
<option>boot.initrd.kernelModules</option>, so they take
precedence.
";
};
};
};
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 = pkgs.lib.mergeListOption;
# Convert the list of path to only one path.
apply = pkgs.aggregateModules;
};
system.sbin.modprobe = mkOption {
# should be moved in module-init-tools
internal = true;
default = pkgs.writeTextFile {
name = "modprobe";
destination = "/sbin/modprobe";
executable = true;
text =
''
#! ${pkgs.stdenv.shell}
export MODULE_DIR=${config.system.modulesTree}/lib/modules
exec ${pkgs.module_init_tools}/sbin/modprobe "$@"
'';
};
description = ''
Wrapper around modprobe that sets the path to the modules
tree.
'';
};
};
in
###### implementation
let
kernelPackages = config.boot.kernelPackages;
kernel = kernelPackages.kernel;
in
{
require = [
options
# udev
];
system = {
# include kernel modules.
modulesTree = [ kernel ] ++ config.boot.extraModulePackages;
};
services = {
udev = {
# The Linux kernel >= 2.6.27 provides firmware
addFirmware = [ "${kernel}/lib/firmware" ];
};
};
}