lay base for SD shit

src/DSi_SD.h

@@ -0,0 +1,41 @@
+/*
+    Copyright 2016-2019 Arisotura
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef DSI_SD_H
+#define DSI_SD_H
+
+class DSi_SD
+{
+public:
+    DSi_SD(u32 num);
+    ~DSi_SD();
+
+    void Reset();
+
+    void DoSavestate(Savestate* file);
+
+    u16 Read(u32 addr);
+    void Write(u32 addr, u16 val);
+
+private:
+    u32 Num;
+
+    u16 PortSelect;
+};
+
+#endif // DSI_SD_H