surface: add kernel 6.4.12

microsoft/surface/common/kernel/linux-6.4.12/default.nix

@@ -0,0 +1,38 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkIf mkOption types;
+  inherit (pkgs) fetchurl;
+
+  inherit (pkgs.callPackage ../linux-package.nix { }) linuxPackage repos;
+
+  cfg = config.microsoft-surface;
+
+  version = "6.4.12";
+  extraMeta.branch = "6.4";
+  patchDir = repos.linux-surface + "/patches/${extraMeta.branch}";
+  kernelPatches = pkgs.callPackage ./patches.nix {
+    inherit (lib) kernel;
+    inherit version patchDir;
+  };
+
+  kernelPackages = linuxPackage {
+    inherit version extraMeta kernelPatches;
+    src = fetchurl {
+      url = "mirror://kernel/linux/kernel/v6.x/linux-${version}.tar.xz";
+      sha256 = "0x56b4hslm730ghvggz41fjkbzlnxp6k8857dn7iy27yavlipafc";
+    };
+  };
+
+
+in {
+  options.microsoft-surface.kernelVersion = mkOption {
+    type = types.enum [ "6.4.12" ];
+  };
+
+  config = mkIf (cfg.kernelVersion == "6.4.12") {
+    boot = {
+      inherit kernelPackages;
+    };
+  };
+}