arch/arm/rp23xx: add text heap (up_textheap_memalign) support

arch/arm/Kconfig

@@ -395,6 +395,7 @@ config ARCH_CHIP_RP23XX
 	select ARCH_HAVE_FPU
 	select ARCH_HAVE_CUSTOM_TESTSET
 	select ARCH_BOARD_COMMON
+	select ARCH_HAVE_TEXT_HEAP
 	---help---
 		Raspberry Pi RP23XX architectures (ARM dual Cortex-M33 or RISC-V).
 

arch/arm/src/rp23xx/CMakeLists.txt

@@ -89,4 +89,8 @@ if(CONFIG_CRYPTO_CRYPTODEV_HARDWARE)
   list(APPEND SRCS rp23xx_crypto.c)
 endif()
 
+if(CONFIG_ARCH_USE_TEXT_HEAP)
+  list(APPEND SRCS rp23xx_textheap.c)
+endif()
+
 target_sources(arch PRIVATE ${SRCS})

arch/arm/src/rp23xx/Make.defs

@@ -92,3 +92,7 @@ endif
 ifeq ($(CONFIG_CRYPTO_CRYPTODEV_HARDWARE),y)
 CHIP_CSRCS += rp23xx_crypto.c
 endif
+
+ifeq ($(CONFIG_ARCH_USE_TEXT_HEAP),y)
+CHIP_CSRCS += rp23xx_textheap.c
+endif

arch/arm/src/rp23xx/rp23xx_textheap.c

@@ -0,0 +1,99 @@
+/****************************************************************************
+ * arch/arm/src/rp23xx/rp23xx_textheap.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Text-heap allocator for the RP2350.
+ *
+ * Dynamically loaded code (e.g. a "lifted arm" copied in from NFS) must be
+ * placed in memory that the CPU can both write and then execute.  On the
+ * RP2350 the on-chip SRAM (0x20000000) is normal, executable memory, and
+ * this port runs without the MPU enabled (CONFIG_ARM_MPU=n), so RAM is not
+ * marked no-execute.  The general-purpose kernel heap therefore already
+ * satisfies the requirements of a text heap, and these wrappers simply
+ * forward to it (the same approach used by arch/arm/src/cxd56xx).
+ *
+ * Because the instruction and data views of this memory are the same
+ * address, ARCH_HAVE_TEXT_HEAP_SEPARATE_DATA_ADDRESS is not selected and
+ * up_textheap_data_address() is not required.
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdbool.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/kmalloc.h>
+
+#ifdef CONFIG_ARCH_USE_TEXT_HEAP
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_textheap_memalign
+ *
+ * Description:
+ *   Allocate aligned, executable memory for dynamically loaded code.
+ *
+ ****************************************************************************/
+
+void *up_textheap_memalign(size_t align, size_t size)
+{
+  return kmm_memalign(align, size);
+}
+
+/****************************************************************************
+ * Name: up_textheap_free
+ *
+ * Description:
+ *   Free memory previously returned by up_textheap_memalign().
+ *
+ ****************************************************************************/
+
+void up_textheap_free(void *p)
+{
+  if (p != NULL)
+    {
+      kmm_free(p);
+    }
+}
+
+/****************************************************************************
+ * Name: up_textheap_heapmember
+ *
+ * Description:
+ *   Test if the given address was allocated from the text heap.
+ *
+ ****************************************************************************/
+
+bool up_textheap_heapmember(void *p)
+{
+  return kmm_heapmember(p);
+}
+
+#endif /* CONFIG_ARCH_USE_TEXT_HEAP */