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Arm-Cortex-R82: Add MPU support (#1347)

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* arm-cortex-r82: Add MPU support

This commit introduces support for the Memory Protection Unit (MPU)
to the ARM Cortex-R82 port. The MPU enhances system security
by allowing the definition of memory regions with specific access
permissions. The following changes have been made:
- Added MPU configuration functions in `port.c` to set up memory
  regions and their attributes.
- Updated `portASM.S` to include assembly routines for MPU
  and context switching with MPU support.
- Created `mpu_wrappers_v2_asm.c` to provide assembly wrappers for
  MPU operations.
- Updated `portmacro.h` to include MPU-related macros and definitions.
- Modified `task.h` to include MPU-related task attributes.
- Updated `CMakeLists.txt` to include the new MPU source file.
- Enhanced the `README.md` with instructions on MPU configuration.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

* cortex-r82: Minor code improvements

This commit includes minor code improvements to enhance readability
and maintainability of the Cortex-R82 port files. Changes include
refactoring variable names, optimizing comments, and improving code
structure without altering functionality.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

* tasks: Disable stack-depth check if MPU wrappers is set

This stack-depth check should not be performed for ports
where portUSING_MPU_WRAPPERS is set to 1.
In this case, pxTopOfStack and pxNewTCB->pxTopOfStack reside
in different memory regions: pxTopOfStack is in unprivileged SRAM,
while pxNewTCB->pxTopOfStack is in privileged SRAM.
This is because pxPortInitialiseStack() returns the address of
`ullContext` array rather than the decremented pxTopOfStack,
as is done in the non-MPU case.
Consequently, this check is not valid in this scenario.

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>

---------

Signed-off-by: Ahmed Ismail <Ahmed.Ismail@arm.com>
This commit is contained in:
Ahmed Ismail 2026-02-11 04:48:55 +00:00 • committed by GitHub
parent d33d04b14c
commit 6cd736cfeb
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10 changed files with 3130 additions and 504 deletions
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4
portable/CMakeLists.txt
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@ -243,7 +243,8 @@ add_library(freertos_kernel_port OBJECT
# ARMv8-R ports for GCC
$<$<STREQUAL:${FREERTOS_PORT},GCC_ARM_CR82>:
GCC/ARM_CR82/port.c
GCC/ARM_CR82/portASM.S>
GCC/ARM_CR82/portASM.S
GCC/ARM_CR82/mpu_wrappers_v2_asm.c>
# ARMv4T ARM7TDMI ports for GCC
$<$<STREQUAL:${FREERTOS_PORT},GCC_ARM7_AT91FR40008>:
@ -822,6 +823,7 @@ if( FREERTOS_PORT MATCHES "GCC_ARM_CM(3|4)_MPU" OR
FREERTOS_PORT MATCHES "GCC_ARM_CM(23|33|52|55|85)_NTZ_NONSECURE" OR
FREERTOS_PORT MATCHES "GCC_ARM_CM(23|33|52|55|85)_NONSECURE" OR
FREERTOS_PORT MATCHES "GCC_ARM_CM(33|52|55|85)_TFM" OR
FREERTOS_PORT MATCHES "GCC_ARM_CR82" OR
FREERTOS_PORT MATCHES "IAR_ARM_CM(23|33|52|55|85)_NTZ_NONSECURE" OR
FREERTOS_PORT MATCHES "IAR_ARM_CM(23|33|52|55|85)_NONSECURE" OR
FREERTOS_PORT MATCHES "IAR_ARM_CM(33|52|55|85)_TFM"