arch: cxd56xx: Introduce cxd56_modtext.c

Summary:
- This commit introduces cxd56_modtext.c to allocate a separate
  text memory for ELF

Impact:
- None

Testing:
- Tested with spresense:elf

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

arch/arm/src/cxd56xx/Make.defs

@@ -97,6 +97,10 @@ CHIP_CSRCS += cxd56_testset.c
 endif
 endif
 
+ifeq ($(CONFIG_ARCH_USE_MODULE_TEXT), y)
+CHIP_CSRCS += cxd56_modtext.c
+endif
+
 ifeq ($(CONFIG_CXD56_UART0),y)
 CHIP_CSRCS += cxd56_uart0.c
 endif

arch/arm/src/cxd56xx/cxd56_modtext.c

@@ -0,0 +1,71 @@
+/****************************************************************************
+ * arch/arm/src/cxd56xx/cxd56_modtext.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/kmalloc.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_module_text_init()
+ ****************************************************************************/
+
+void up_module_text_init()
+{
+}
+
+/****************************************************************************
+ * Name: up_module_text_memalign()
+ ****************************************************************************/
+
+FAR void *up_module_text_memalign(size_t align, size_t size)
+{
+  FAR void *ret;
+  ret = (FAR void *)kmm_malloc(size);
+
+#ifdef CONFIG_CXD56_USE_SYSBUS
+  ret -= 0x20000000;
+#endif
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: up_module_text_free()
+ ****************************************************************************/
+
+void up_module_text_free(FAR void *p)
+{
+  kmm_free(p);
+}