libc: Optimize malloc() initialization

The BSPs provide memory for the separate C Program Heap initialization
via _Memory_Get().  Most BSPs provide exactly one memory area.  Only two
BSPs provide more than one memory area (arm/altera-cyclone-v and
bsps/powerpc/mpc55xxevb).  Only if more than one memory area is
provided, there is a need to use _Heap_Extend().  Provide two
implementations to initialize the separate C Program Heap and let the
BSP select one of the implementations based on the number of provided
memory areas.  This gets rid of a dependency on _Heap_Extend().  It
also avoids dead code sections for most BSPs.

Change licence to BSD-2-Clause according to file history.

Update #3053.

1 files changed, 49 insertions, 0 deletions

diff --git a/bsps/shared/start/mallocinitmulti.c b/bsps/shared/start/mallocinitmulti.c
new file mode 100644
index 0000000000..ad04ea14ed
--- /dev/null
+++ b/bsps/shared/start/mallocinitmulti.c
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup MallocSupport
+ *
+ * @brief This source file contains the _Workspace_Malloc_initialize_separate()
+ *   implementation which supports more than one memory area.
+ */
+
+/*
+ * Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/mallocinitmulti.h>
+#include <rtems/score/wkspacedata.h>
+
+static Heap_Control _Malloc_Heap;
+
+Heap_Control *_Workspace_Malloc_initialize_separate( void )
+{
+  return _Malloc_Initialize_for_multiple_areas( &_Malloc_Heap );
+}