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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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10
include/task.h
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@ -1,6 +1,7 @@
/*
* FreeRTOS Kernel <DEVELOPMENT BRANCH>
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* Copyright 2025 Arm Limited and/or its affiliates <open-source-office@arm.com>
*
* SPDX-License-Identifier: MIT
*
@ -68,18 +69,21 @@
#if defined( portARMV8M_MINOR_VERSION ) && ( portARMV8M_MINOR_VERSION >= 1 )
#define tskMPU_REGION_PRIVILEGED_EXECUTE_NEVER ( 1U << 5U )
#endif /* portARMV8M_MINOR_VERSION >= 1 */
#define tskMPU_REGION_NON_SHAREABLE ( 1U << 6U )
#define tskMPU_REGION_OUTER_SHAREABLE ( 1U << 7U )
#define tskMPU_REGION_INNER_SHAREABLE ( 1U << 8U )
/* MPU region permissions stored in MPU settings to
* authorize access requests. */
#define tskMPU_READ_PERMISSION ( 1U << 0U )
#define tskMPU_WRITE_PERMISSION ( 1U << 1U )
#define tskMPU_READ_PERMISSION ( 1U << 0U )
#define tskMPU_WRITE_PERMISSION ( 1U << 1U )
/* The direct to task notification feature used to have only a single notification
* per task. Now there is an array of notifications per task that is dimensioned by
* configTASK_NOTIFICATION_ARRAY_ENTRIES. For backward compatibility, any use of the
* original direct to task notification defaults to using the first index in the
* array. */
#define tskDEFAULT_INDEX_TO_NOTIFY ( 0 )
#define tskDEFAULT_INDEX_TO_NOTIFY ( 0 )
/**
* task. h