* base for potentially re-encrypting modcrypt, doesn't seem to be required? but can also serve to decrypt it

* revise SD IRQ behavior (fixing potential hang when loading DS games)

src/DSi_SD.h

@@ -84,6 +84,7 @@ private:
     void UpdateData32IRQ();
     void ClearIRQ(u32 irq);
     void SetIRQ(u32 irq);
+    void UpdateIRQ(u32 oldmask);
 };