| # Kconfig - Memory Protection Unit (MPU) configuration options |
| |
| # |
| # Copyright (c) 2017 Linaro Limited |
| # |
| # SPDX-License-Identifier: Apache-2.0 |
| # |
| |
| if CPU_HAS_MPU |
| |
| config ARM_MPU |
| bool "ARM MPU Support" |
| select MEMORY_PROTECTION |
| select THREAD_STACK_INFO |
| select ARCH_HAS_EXECUTABLE_PAGE_BIT |
| select MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT if !(CPU_HAS_NXP_MPU || ARMV8_M_BASELINE || ARMV8_M_MAINLINE) |
| select MPU_REQUIRES_NON_OVERLAPPING_REGIONS if CPU_HAS_ARM_MPU && (ARMV8_M_BASELINE || ARMV8_M_MAINLINE) |
| help |
| MCU implements Memory Protection Unit. |
| Note that NXP MPU as well as ARMv8-M MPU does not require MPU regions |
| to have power-of-two alignment for base address and region size. |
| In addition to the above, ARMv8-M MPU requires the active MPU regions |
| be non-overlapping. |
| |
| config ARM_MPU_REGION_MIN_ALIGN_AND_SIZE |
| int |
| default 32 if ARM_MPU |
| default 4 |
| help |
| Minimum size (and alignment) of an ARM MPU region. Use this |
| symbol to guarantee minimum size and alignment of MPU regions. |
| A minimum 4-byte alignment is enforced in ARM builds without |
| support for Memory Protection. |
| |
| config MPU_STACK_GUARD |
| bool "Thread Stack Guards" |
| depends on ARM_MPU |
| help |
| Enable Thread Stack Guards via MPU |
| |
| config MPU_ALLOW_FLASH_WRITE |
| bool "Add MPU access to write to flash" |
| depends on ARM_MPU |
| help |
| Enable this to allow MPU RWX access to flash memory |
| |
| endif # CPU_HAS_MPU |
