nixpkgs/nixos/modules/hardware/cpu/intel-microcode.nix

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{ config, lib, pkgs, ... }:
with lib;
{
###### interface
options = {
hardware.cpu.intel.updateMicrocode = mkOption {
default = false;
type = types.bool;
description = ''
Update the CPU microcode for Intel processors.
'';
};
};
###### implementation
config = mkIf config.hardware.cpu.intel.updateMicrocode {
# Microcode updates must be the first item prepended in the initrd
boot.initrd.prepend = mkOrder 1 [ "${pkgs.microcodeIntel}/intel-ucode.img" ];
};
}