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

nixos/modules/hardware/network/b43.nix

@@ -0,0 +1,32 @@
+{pkgs, config, ...}:
+
+let kernelVersion = config.boot.kernelPackages.kernel.version; in
+
+{
+
+  ###### interface
+
+  options = {
+
+    networking.enableB43Firmware = pkgs.lib.mkOption {
+      default = false;
+      type = pkgs.lib.types.bool;
+      description = ''
+        Turn on this option if you want firmware for the NICs supported by the b43 module.
+      '';
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = pkgs.lib.mkIf config.networking.enableB43Firmware {
+    assertions = [ {
+      assertion = builtins.lessThan 0 (builtins.compareVersions kernelVersion "3.2");
+      message = "b43 firmware for kernels older than 3.2 not packaged yet!";
+    } ];
+    hardware.firmware = [ pkgs.b43Firmware_5_1_138 ];
+  };
+
+}