Move all of NixOS to nixos/ in preparation of the repository merge

nixos/modules/system/boot/loader/efi.nix

@@ -0,0 +1,49 @@
+{ pkgs, ... }:
+
+with pkgs.lib;
+
+{
+  options.boot.loader.efi = {
+    canTouchEfiVariables = mkOption {
+      default = false;
+
+      type = types.bool;
+
+      description = "Whether or not the installation process should modify efi boot variables.";
+    };
+
+    efibootmgr = {
+      efiDisk = mkOption {
+        default = "/dev/sda";
+
+        type = types.string;
+
+        description = "The disk that contains the EFI system partition.";
+      };
+
+      efiPartition = mkOption {
+        default = "1";
+        description = "The partition number of the EFI system partition.";
+      };
+
+      postEfiBootMgrCommands = mkOption {
+        default = "";
+        type = types.string;
+        description = ''
+          Shell commands to be executed immediately after efibootmgr has setup the system EFI.
+          Some systems do not follow the EFI specifications properly and insert extra entries.
+          Others will brick (fix by removing battery) on boot when it finds more than X entries.
+          This hook allows for running a few extra efibootmgr commands to combat these issues.
+        '';
+      };
+    };
+
+    efiSysMountPoint = mkOption {
+      default = "/boot";
+
+      type = types.string;
+
+      description = "Where the EFI System Partition is mounted.";
+    };
+  };
+}