reorganization

modules/core/kernel.nix

@@ -0,0 +1,27 @@
+{ lib, config, pkgs, ... }:
+
+with lib;
+let
+  cfg = config.modules.core.kernel;
+in {
+  options.modules.core.kernel = {
+    zswap = mkEnableOption "Enable zswap, a compressed RAM cache for swap pages";
+    v4l2 = mkEnableOption "Enable support for v4l2 loopback devices";
+  };
+
+  config = mkMerge [
+    (mkIf cfg.zswap {
+      boot.kernelParams = [
+        "zswap.enabled=1"
+        "zswap.shrinker_enabled=1"
+        "zswap.max_pool_percent=20"
+        "zswap.compressor=zstd"
+        "zswap.zpool=zsmalloc"
+      ];
+    })
+    (mkIf cfg.v4l2 {
+      boot.kernelModules = ["v4l2loopback"];
+      boot.extraModulePackages = with config.boot.kernelPackages; [ v4l2loopback ];
+    })
+  ];
+}