Add all of iogamaster modules

modules/nixos/system/boot/bios/default.nix

@@ -0,0 +1,23 @@
+{
+  options,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with lib.frajul;
+let
+  cfg = config.modules.system.boot.bios;
+in
+{
+  options.modules.system.boot.bios = with types; {
+    enable = mkBoolOpt false "Whether or not to enable bios booting.";
+    device = mkOpt str "/dev/sda" "Disk that grub will be installed to.";
+  };
+
+  config = mkIf cfg.enable {
+    boot.loader.grub = {
+      enable = true;
+    };
+  };
+}

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

@@ -0,0 +1,25 @@
+{
+  options,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with lib.frajul;
+let
+  cfg = config.modules.system.boot.efi;
+in
+{
+  options.modules.system.boot.efi = with types; {
+    enable = mkBoolOpt false "Whether or not to enable efi booting.";
+  };
+
+  config = mkIf cfg.enable {
+    boot.loader.systemd-boot.enable = true;
+    boot.loader.systemd-boot.configurationLimit = 5;
+    boot.loader.efi.canTouchEfiVariables = true;
+
+    # https://github.com/NixOS/nixpkgs/blob/c32c39d6f3b1fe6514598fa40ad2cf9ce22c3fb7/nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix#L66
+    boot.loader.systemd-boot.editor = false;
+  };
+}