Import the "gerbert" kernel I worked on earlier this year.

It's a lot crappier than I remembered it. It's gonna need a lot of work.

Kernel/RefCounted.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include "Assertions.h"
+#include "VGA.h"
+
+#define DEBUG_REFCOUNTED
+
+class RefCountedBase {
+
+protected:
+    bool derefBase() const
+    {
+        return !--m_refCount;
+    }
+    mutable size_t m_refCount { 1 };
+#ifdef DEBUG_REFCOUNTED
+    //mutable bool m_adopted { false };
+#endif
+};
+
+template<typename T>
+class RefCounted : public RefCountedBase {
+public:
+    size_t refCount() const { return m_refCount; }
+
+    void ref() const
+    {
+#ifdef DEBUG_REFCOUNTED
+        ASSERT(m_refCount);
+        //ASSERT(m_adopted);
+#endif
+        ++m_refCount;
+    }
+
+    void deref() const
+    {
+#ifdef DEBUG_REFCOUNTED
+        ASSERT(m_refCount);
+        //ASSERT(m_adopted);
+#endif
+        if (derefBase())
+            delete static_cast<const T*>(this);
+    }
+
+protected:
+    RefCounted() { }
+    ~RefCounted() { }
+};