bsps: Move stackalloc.c to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/shared/start/stackalloc.c

@@ -0,0 +1,65 @@
+/**
+ * @file
+ *
+ * @ingroup bsp_shared
+ *
+ * @brief Stack initialization, allocation and free functions.
+ */
+
+/*
+ * Copyright (c) 2009-2013 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <bsp/stackalloc.h>
+
+#include <rtems.h>
+#include <rtems/score/heapimpl.h>
+#include <rtems/score/wkspace.h>
+
+#include <bsp/linker-symbols.h>
+
+static Heap_Control bsp_stack_heap;
+
+void bsp_stack_allocate_init(size_t stack_space_size)
+{
+  _Heap_Initialize(
+    &bsp_stack_heap,
+    bsp_section_stack_begin,
+    (uintptr_t) bsp_section_stack_size,
+    CPU_STACK_ALIGNMENT
+  );
+}
+
+void *bsp_stack_allocate(size_t size)
+{
+  void *stack = NULL;
+
+  if (bsp_stack_heap.area_begin != 0) {
+    stack = _Heap_Allocate(&bsp_stack_heap, size);
+  }
+
+  if (stack == NULL) {
+    stack = _Workspace_Allocate(size);
+  }
+
+  return stack;
+}
+
+void bsp_stack_free(void *stack)
+{
+  bool ok = _Heap_Free(&bsp_stack_heap, stack);
+
+  if (!ok) {
+    _Workspace_Free(stack);
+  }
+}