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arm: core: mpu: Add core MPU implementation

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This patch adds the arm core MPU implementation.
This implementation currently supports the thread stack guard feature.

Change-Id: I8b3795ebaf1ebad38aaddc2ed2f05535ead2c09a
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@linaro.org>
This commit is contained in:
Vincenzo Frascino 2017-03-29 11:29:26 +01:00 • committed by Kumar Gala
commit 726c7b545f
2 changed files with 32 additions and 0 deletions
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1
arch/arm/core/cortex_m/mpu/Makefile
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@ -1,2 +1,3 @@
obj-$(CONFIG_ARM_CORE_MPU) += arm_core_mpu.o
obj-$(CONFIG_ARM_MPU) += arm_mpu.o
obj-$(CONFIG_NXP_MPU) += nxp_mpu.o

31
arch/arm/core/cortex_m/mpu/arm_core_mpu.c Normal file
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@ -0,0 +1,31 @@
/*
* Copyright (c) 2017 Linaro Limited.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <device.h>
#include <init.h>
#include <kernel.h>
#include <soc.h>
#include <arch/arm/cortex_m/cmsis.h>
#include <arch/arm/cortex_m/mpu/arm_core_mpu.h>
#if defined(CONFIG_MPU_STACK_GUARD)
/*
* @brief Configure MPU stack guard
*
* This function configures per thread stack guards reprogramming the MPU.
* The functionality is meant to be used during context switch.
*
* @param thread thread info data structure.
*/
void configure_mpu_stack_guard(struct k_thread *thread)
{
arm_core_mpu_disable();
arm_core_mpu_configure(THREAD_STACK_GUARD_REGION,
thread->stack_info.start,
thread->stack_info.size);
arm_core_mpu_enable();
}
#endif