Kernel: Add KParams class for accessing kernel cmdline parameters (#188)

Author: https://github.com/deoxxa
Commit: 738f9de9a9
Pull-request: https://github.com/SerenityOS/serenity/pull/188
Reviewed-by: https://github.com/awesomekling

Kernel/KParams.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <AK/AKString.h>
+#include <AK/HashMap.h>
+
+class KParams {
+    AK_MAKE_ETERNAL
+public:
+    static KParams& the();
+
+    KParams(const String& cmdline);
+
+    const String& cmdline() const { return m_cmdline; }
+    String get(const String& key) const;
+    bool has(const String& key) const;
+private:
+    String m_cmdline;
+    HashMap<String, String> m_params;
+};