Prepare save spot for booting

include/PSX/jabyengine.h

@@ -0,0 +1,23 @@
+#ifndef __JABYENGINE__H__
+#define __JABYENGINE__H__
+#include "../stdint.h"
+
+namespace JabyEngine {
+    struct NextRoutine {
+        typedef NextRoutine (*ExecutionFunction)();
+
+        uintptr_t value;
+
+        static NextRoutine null() {
+            return {.value = 0};
+        }
+
+        static NextRoutine from(ExecutionFunction function) {
+            return {.value = reinterpret_cast<uintptr_t>(function)};
+        }
+    };
+
+    typedef NextRoutine::ExecutionFunction ExecutionFunction;
+}
+
+#endif //!__JABYENGINE__H__

include/PSX/jabyengine_defines.h

@@ -1,5 +1,5 @@
-#ifndef __JABYENGINE_DEFINES__H
-#define __JABYENGINE_DEFINES__H
+#ifndef __JABYENGINE_DEFINES__H__
+#define __JABYENGINE_DEFINES__H__
 #include "../stddef.h"
 
 #define __keep          __attribute__((used))
@@ -13,4 +13,4 @@
 #else
     #define __constexpr
 #endif
-#endif //!__JABYENGINE_DEFINES__H
+#endif //!__JABYENGINE_DEFINES__H__