arch: arm: mmu: introduce K_MEM_ARM_NORMAL_NC flag

Add new flag to allow to select normal non-cacheable memory.
This is needed for armV7 to be able to configure non cacheable
memories with "normal" attribute instead of "device" attribute.

Signed-off-by: Arnaud Pouliquen <[email protected]>

Author: arnopo

include/zephyr/arch/arm/mmu/arm_mem.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef ZEPHYR_INCLUDE_ARCH_ARM_ARM_MEM_H_
+#define ZEPHYR_INCLUDE_ARCH_ARM_ARM_MEM_H_
+
+/*
+ * Define ARM specific memory flags used by k_mem_map_phys_bare()
+ * followed public definitions in include/kernel/mm.h.
+ */
+
+/** ARM Specific flags: normal memory with Non-cacheable */
+#define K_MEM_ARM_NORMAL_NC	5
+
+#endif /* ZEPHYR_INCLUDE_ARCH_ARM_ARM_MEM_H_ */

include/zephyr/kernel/mm.h

@@ -11,6 +11,8 @@
 #include <zephyr/toolchain.h>
 #if defined(CONFIG_ARM_MMU) && defined(CONFIG_ARM64)
 #include <zephyr/arch/arm64/arm_mem.h>
+#elif defined(CONFIG_ARM_AARCH32_MMU)
+#include <zephyr/arch/arm/mmu/arm_mem.h>
 #endif /* CONFIG_ARM_MMU && CONFIG_ARM64 */
 
 #include <zephyr/kernel/internal/mm.h>