Expose dccm area

-expose dccm area giving the user an extra 8k of memory
-simple implementation of a malloc like function for dccm memory area

Author: bigdinotech

cores/arduino/Arduino.h

@@ -117,5 +117,6 @@ extern uint32_t pwmPeriod[4];
 #include "wiring_analog.h"
 #include "wiring_shift.h"
 #include "WInterrupts.h"
+#include "dccm/dccm_alloc.h"
 
 #endif // Arduino_h

cores/arduino/dccm/dccm_alloc.c

@@ -0,0 +1,42 @@
+/*
+Copyright (c) 2016 Intel Corporation.  All right reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library 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
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+*/
+
+#include "dccm_alloc.h"
+
+uint16_t dccm_index = 0;
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+void* dccm_malloc(uint16_t size)
+{
+    if((size + dccm_index) > DCCM_SIZE)
+    {
+        return 0;
+    }
+    
+    void* addr = (void*)(DCCM_START + dccm_index);
+    dccm_index += size;
+    return addr;
+}
+
+#ifdef __cplusplus
+}
+#endif

cores/arduino/dccm/dccm_alloc.h

@@ -0,0 +1,39 @@
+/*
+Copyright (c) 2016 Intel Corporation.  All right reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library 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
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+*/
+
+#include <stdint.h>
+
+#define DCCM_START  0x80000000
+#define DCCM_SIZE 8192
+
+#ifndef _DCCM_ALLOC_
+#define _DCCM_ALLOC_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+void* dccm_malloc(uint16_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif