Add a Stack convenience class

luna/include/luna/Stack.h

@@ -0,0 +1,23 @@
+#pragma once
+#include <luna/Types.h>
+
+struct Stack
+{
+    Stack(u64 base, usize bytes);
+
+    u64 bottom()
+    {
+        return m_base;
+    }
+
+    u64 top();
+
+    usize bytes()
+    {
+        return m_bytes;
+    }
+
+  private:
+    u64 m_base;
+    usize m_bytes;
+};

luna/src/Stack.cpp

@@ -0,0 +1,10 @@
+#include <luna/Stack.h>
+
+Stack::Stack(u64 base, usize bytes) : m_base(base), m_bytes(bytes)
+{
+}
+
+u64 Stack::top()
+{
+    return (m_base + m_bytes) - sizeof(void*);
+}