diff --git a/initrd/etc/functions b/initrd/etc/functions
index 007c2c1f..f3cf513d 100755
--- a/initrd/etc/functions
+++ b/initrd/etc/functions
@@ -314,6 +314,22 @@ replace_config() {
 	rm -f ${CONFIG_FILE}.tmp
 }
 
+invert_yn() {
+	if [ "$1" = "y" ]; then
+		echo "n"
+	else
+		echo "y"
+	fi
+}
+
+toggle_config() {
+	CONFIG_FILE="$1"
+	CONFIG_OPTION="$2"
+
+	NEW_SETTING="$(invert_yn "$(load_config_value "$CONFIG_OPTION")")"
+	set_config "$CONFIG_FILE" "$CONFIG_SETTING" "$NEW_SETTING"
+}
+
 # Set a config variable to a given value - replace it if it exists, or add it.
 # If added, the variable will be exported.
 set_config() {