soc: arm: fvp_aemv8r_aarch32: define static mpu regions

Add static MPU regions for this SoC.
These regions will be initialized as static region during system boot.

Signed-off-by: Julien Massot <[email protected]>
Signed-off-by: Manuel Arguelles <[email protected]>

Author: Julien Massot

soc/arm/arm/fvp_aemv8r_aarch32/CMakeLists.txt

@@ -1,2 +1,4 @@
 # Copyright (c) 2022 IoT.bzh
 # SPDX-License-Identifier: Apache-2.0
+
+zephyr_library_sources_ifdef(CONFIG_ARM_MPU arm_mpu_regions.c)

soc/arm/arm/fvp_aemv8r_aarch32/Kconfig.defconfig.series

@@ -26,6 +26,9 @@ config FLASH_SIZE
 config FLASH_BASE_ADDRESS
 	default $(dt_chosen_reg_addr_hex,$(DT_CHOSEN_Z_FLASH))
 
+config MAX_DOMAIN_PARTITIONS
+	default 24 if USERSPACE
+
 endif # SOC_FVP_AEMV8R_AARCH32
 
 endif # SOC_SERIES_FVP_AEMV8R_AARCH32

soc/arm/arm/fvp_aemv8r_aarch32/Kconfig.soc

@@ -8,6 +8,7 @@ choice
 config SOC_FVP_AEMV8R_AARCH32
 	bool "ARM FVP AEMv8R aarch32 simulation"
 	select CPU_CORTEX_R52
+	select CPU_HAS_ARM_MPU
 	select CPU_HAS_MPU
 	select GIC_V3
 	select GIC_SINGLE_SECURITY_STATE

soc/arm/arm/fvp_aemv8r_aarch32/arm_mpu_regions.c

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2022 IoT.bzh
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/sys/slist.h>
+#include <zephyr/linker/linker-defs.h>
+#include <zephyr/arch/arm/aarch32/mpu/arm_mpu.h>
+
+#define DEVICE_REGION_START 0x80000000UL
+#define DEVICE_REGION_END   0xFFFFFFFFUL
+
+static const struct arm_mpu_region mpu_regions[] = {
+	/* Region 0 zephyr vector */
+	MPU_REGION_ENTRY("vector",
+			 (uintptr_t)_vector_start,
+			 REGION_RAM_TEXT_ATTR((uintptr_t)_vector_end)),
+
+	/* Region 1 zephyr text */
+	MPU_REGION_ENTRY("SRAM_0",
+			 (uintptr_t)__text_region_start,
+			 REGION_RAM_TEXT_ATTR((uintptr_t)__rodata_region_start)),
+
+	/* Region 2 zephyr rodata */
+	MPU_REGION_ENTRY("SRAM_1",
+			 (uintptr_t)__rodata_region_start,
+			 REGION_RAM_RO_ATTR((uintptr_t)__rodata_region_end)),
+
+	/* Region 3 zephyr data */
+	MPU_REGION_ENTRY("SRAM_2",
+#ifdef CONFIG_USERSPACE
+			 (uintptr_t)_app_smem_start,
+#else
+			 (uintptr_t)__kernel_ram_start,
+#endif
+			 REGION_RAM_ATTR((uintptr_t)__kernel_ram_end)),
+
+	/* Region 4 device region */
+	MPU_REGION_ENTRY("DEVICE",
+			 DEVICE_REGION_START,
+			 REGION_DEVICE_ATTR(DEVICE_REGION_END)),
+};
+
+const struct arm_mpu_config mpu_config = {
+	.num_regions = ARRAY_SIZE(mpu_regions),
+	.mpu_regions = mpu_regions,
+};