dolphin lib work (#237)

* getLayerNo_common_common finally matched

* dolphin ai / ar / card work from prime decomp

* work on dolphin dvd / dsp / db

* more dolphin os work

* si work

* remove asm

* build fix

include/dolphin/db/db.h

@@ -3,4 +3,28 @@
 
 #include "dolphin/types.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define OS_DBINTERFACE_ADDR 0x00000040
+
+typedef struct DBInterface {
+    /* 0x0 */ u32 bPresent;
+    /* 0x4 */ u32 exceptionMask;
+    /* 0x8 */ void (*ExceptionDestination)(void);
+    /* 0xC */ void* exceptionReturn;
+} DBInterface;
+
+extern DBInterface* __DBInterface;
+
+void DBInit(void);
+void __DBExceptionDestinationAux(void);
+void __DBExceptionDestination(void);
+void DBPrintf(char* format, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* DB_H */