3ds: 3ds port sources. Second set of two.

This commit adds new files written exclusively for the 3ds port.

Additional comments:

1. Plugins works, but will be enabled in future commits.
2. The port has only been tested on the New 3DS.
3. Not all features of rockbox have been tested so there may be bugs or non-functional features.
4. There is a known issue where a random crash can occur when exiting the app.

Change-Id: I122d0bea9aa604e04fca45ba8287cf79e6110769

firmware/target/hosted/ctru/app/button-target.h

@@ -0,0 +1,54 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 by Rob Purchase
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef _BUTTON_TARGET_H_
+#define _BUTTON_TARGET_H_
+
+/* Logical buttons key codes */
+#define BUTTON_UP           0x00000001
+#define BUTTON_DOWN         0x00000002
+#define BUTTON_LEFT         0x00000004
+#define BUTTON_RIGHT        0x00000008
+#define BUTTON_USER         0x00000010
+#define BUTTON_MENU         0x00000020
+#define BUTTON_BACK         0x00000040
+#define BUTTON_POWER        0x00000080
+#define BUTTON_SELECT       0x00000100
+
+/* Touch Screen Area Buttons */
+#define BUTTON_TOPLEFT      0x00001000
+#define BUTTON_TOPMIDDLE    0x00002000
+#define BUTTON_TOPRIGHT     0x00004000
+#define BUTTON_MIDLEFT      0x00008000
+#define BUTTON_CENTER       0x00010000
+#define BUTTON_MIDRIGHT     0x00020000
+#define BUTTON_BOTTOMLEFT   0x00040000
+#define BUTTON_BOTTOMMIDDLE 0x00080000
+#define BUTTON_BOTTOMRIGHT  0x00100000
+
+#define BUTTON_MAIN         0x1FFF
+
+/* Software power-off */
+#define POWEROFF_BUTTON BUTTON_POWER
+/* About 3 seconds */
+#define POWEROFF_COUNT 10
+                
+#endif /* _BUTTON_TARGET_H_ */