Use main

include/PSX/jabyengine.h

@@ -4,20 +4,33 @@
 
 namespace JabyEngine {
     struct NextRoutine {
-        typedef NextRoutine (*ExecutionFunction)();
+        static constexpr uintptr_t OverlayBit = (1 << ((sizeof(uintptr_t)*8) - 2));
+        typedef NextRoutine (*MainRoutine)();
 
         uintptr_t value;
 
-        static NextRoutine null() {
+        constexpr static NextRoutine null() {
             return {.value = 0};
         }
 
-        static NextRoutine from(ExecutionFunction function) {
+        static NextRoutine from(MainRoutine function) {
             return {.value = reinterpret_cast<uintptr_t>(function)};
         }
+
+        constexpr bool is_overlay() const {
+            return (this->value & OverlayBit);
+        }
+
+        constexpr bool is_absolute() const {
+            return !NextRoutine::is_overlay();
+        }
+
+        constexpr bool is_null() const {
+            return this->value == 0;
+        }
     };
 
-    typedef NextRoutine::ExecutionFunction ExecutionFunction;
+    typedef NextRoutine::MainRoutine MainRoutine;
 }
 
 #endif //!__JABYENGINE__H__

src/Library/include/BootLoader/boot_loader.hpp

@@ -16,4 +16,8 @@ namespace Setup {
     JabyEngine::NextRoutine start();
 }
 
+namespace BootFile {
+    JabyEngine::NextRoutine setup();
+}
+
 #endif //!BOOT_LOADER_HPP

src/Library/src/BootLoader/boot_file/main_boot.cpp

@@ -0,0 +1,11 @@
+#include "../../../include/BootLoader/boot_loader.hpp"
+#include <stdio.h>
+
+extern JabyEngine::NextRoutine main();
+
+namespace BootFile {
+    JabyEngine::NextRoutine setup() {
+        printf("Running main!\n");
+        return JabyEngine::NextRoutine::from(main);
+    }
+}

src/Library/src/BootLoader/start_boot.cpp

@@ -17,6 +17,6 @@ namespace Setup {
         //Pause??
 
         SPU::setup();
-        return JabyEngine::NextRoutine::null();
+        return BootFile::setup();
     }
 }

src/Library/src/startup.cpp

@@ -2,9 +2,27 @@
 #include <stdio.h>
 
 namespace JabyEngine {
+    static NextRoutine execute(NextRoutine routine) {
+        // Support currently only direct call
+        return reinterpret_cast<MainRoutine>((routine.value & ~JabyEngine::NextRoutine::OverlayBit))();
+    }
+
     void start() {
-        printf("Starting Planschbecken\n");
-        Setup::start();
+        NextRoutine next_routine = JabyEngine::NextRoutine::from(Setup::start);
+
+        printf("Starting Planschbecken 0x%p\n", next_routine.value);
+        while(true) {
+            if(next_routine.is_null()) {
+                break;
+            }
+
+            if(next_routine.is_overlay()) {
+                printf("Overlay not supported yet!\n");
+                break;
+            }
+
+            next_routine = execute(next_routine);
+        }
         printf("Stop!\n");
     }
 }