Moving balloc static memory buffer to DCCM memory

balloc() is used by interrupt context code for memory allocation. The memory space is statically allocated at
initialization.  In order not to take up SRAM memory, this buffer is moved to the DCCM memory space.

Author: SidLeung

cores/arduino/dccm/dccm_alloc.c

@@ -37,6 +37,15 @@ void* dccm_malloc(uint16_t size)
     return addr;
 }
 
+void *dccm_memalign(uint16_t size)
+{
+  if ((dccm_index +3) > DCCM_SIZE)
+    return 0;
+
+  dccm_index = (dccm_index + 3) & ~((uint16_t)0x3);  /* 4 byte addr alignment */
+  return dccm_malloc(size);
+}
+
 #ifdef __cplusplus
 }
 #endif

cores/arduino/dccm/dccm_alloc.h

@@ -31,9 +31,11 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
 void* dccm_malloc(uint16_t size);
 
+void *dccm_memalign(uint16_t size);
+
 #ifdef __cplusplus
 }
 #endif
 
 
-#endif
+#endif

system/libarc32_arduino101/Makefile

@@ -39,7 +39,7 @@ CFGFLAGS+=-DCONFIG_BLUETOOTH_MAX_CONN=2
 CFGFLAGS+=-DCONFIG_BT_GATT_BLE_MAX_SERVICES=10
 CFGFLAGS+=-DCONFIG_BLUETOOTH_GATT_CLIENT
 CFGFLAGS+=-DCONFIG_BLUETOOTH_CENTRAL -DCONFIG_BLUETOOTH_PERIPHERAL
-INCLUDES=-I. -Icommon -Idrivers -Ibootcode -Iframework/include -Iframework/include/services/ble -Iframework/src/services/ble_service
+INCLUDES=-I. -Icommon -Idrivers -Ibootcode -Iframework/include -Iframework/include/services/ble -Iframework/src/services/ble_service -I../../cores/arduino/dccm
 #-Iframework/src/services/ble -Iframework/include/services/ble
 INCLUDES+= -Idrivers/rpc -Iframework/src
 EXTRA_CFLAGS=-D__CPU_ARC__ -DCLOCK_SPEED=32 -std=c99 -fno-reorder-functions -fno-asynchronous-unwind-tables -fno-omit-frame-pointer -fno-defer-pop -Wno-unused-but-set-variable -Wno-main -ffreestanding -fno-stack-protector -mno-sdata -ffunction-sections -fdata-sections

system/libarc32_arduino101/bootcode/c_init.c

@@ -21,6 +21,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 
 #include "interrupt.h"
 #include "arcv2_timer0.h"
+#include "os/os.h"
 
 /* Application main() function prototype */
 extern int main (void);
@@ -60,6 +61,8 @@ static void _exec_ctors (void)
     interrupt_unit_device_init();
     /* Start the system's virtual 64-bit Real Time Counter */
     timer0_driver_init();
+    /* Initialize the memory buffer for balloc() calls. */
+    os_abstraction_init_malloc();
     /* Jump to application main() */
     main ();
     /* Never reached */

system/libarc32_arduino101/framework/include/os/os.h

@@ -132,6 +132,15 @@ extern void queue_get_message (T_QUEUE queue, T_QUEUE_MESSAGE* message, int time
  */
 extern void queue_send_message(T_QUEUE queue, T_QUEUE_MESSAGE message, OS_ERR_TYPE* err );
 
+/**
+ * \brief Initialize the resources used by the framework's memory allocation services
+ *
+ * IMPORTANT : This function must be called during the initialization
+ *             of the OS abstraction layer.
+ *             This function shall only be called once after reset.
+ */
+extern void os_abstraction_init_malloc(void);
+
 /**
  * \brief Reserves a block of memory
  *

system/libarc32_arduino101/framework/src/os/balloc.c

@@ -9,6 +9,7 @@
 
 #include "os/os.h"
 #include "infra/log.h"
+#include "dccm_alloc.h"
 
 #ifdef CONFIG_MEMORY_POOLS_BALLOC_TRACK_OWNER
 #include "misc/printk.h"
@@ -59,7 +60,6 @@ typedef struct {
 
 #include "memory_pool_list.def"
 
-
 /** Pool descriptor definition */
 T_POOL_DESC mpool[] =
 {
@@ -100,21 +100,19 @@ T_POOL_DESC mpool[] =
 
 /** Allocate the memory blocks and tracking variables for each pool */
 #define DECLARE_MEMORY_POOL(index, size, count) \
-    uint8_t mblock_ ## index[count][size]; \
     uint32_t mblock_alloc_track_ ## index[count / BITS_PER_U32 + 1] = { 0 };
 
 #include "memory_pool_list.def"
 
 
-
 /** Pool descriptor definition */
 T_POOL_DESC mpool [] =
 {
 #define DECLARE_MEMORY_POOL(index, size, count) \
     { \
 /* T_POOL_DESC.track */ mblock_alloc_track_ ## index, \
-/* T_POOL_DESC.start */ (uint32_t)mblock_ ## index, \
-/* T_POOL_DESC.end */ (uint32_t)mblock_ ## index + count * size, \
+/* T_POOL_DESC.start */ 0, \
+/* T_POOL_DESC.end */ 0, \
 /* T_POOL_DESC.count */ count, \
 /* T_POOL_DESC.size */ size \
     },
@@ -333,6 +331,14 @@ static void print_pool(int method, void *ctx)
  */
 void os_abstraction_init_malloc(void)
 {
+  int indx;
+  uint32_t bufSize;
+
+  for (indx=0; indx < NB_MEMORY_POOLS; indx++) {
+    bufSize = mpool[indx].count * mpool[indx].size;
+    mpool[indx].start = (uint32_t)dccm_memalign((uint16_t)bufSize);
+    mpool[indx].end = mpool[indx].start + bufSize;
+  }
 }
 
 /**