mirror of https://github.com/ARMmbed/mbed-os.git
Add an initial MPU API
Add a minimalistic HAL MPU API with the ability to prevent execution in ram.pull/8871/head
Russ Butler
Martin Kojtal
parent
5e6dc940ba
commit
0f5b9eaf94
|
|
@ -0,0 +1,149 @@
|
|||
/* mbed Microcontroller Library
|
||||
* Copyright (c) 2018 ARM Limited
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
#include "hal/mpu_api.h"
|
||||
#include "cmsis.h"
|
||||
|
||||
void mbed_mpu_init()
|
||||
{
|
||||
mbed_mpu_enable_ram_xn(false);
|
||||
}
|
||||
|
||||
void mbed_mpu_free()
|
||||
{
|
||||
mbed_mpu_enable_ram_xn(false);
|
||||
}
|
||||
|
||||
void mbed_mpu_enable_ram_xn(bool enable)
|
||||
{
|
||||
#if MBED_MPU_ENABLED
|
||||
// Flush memory writes before configuring the MPU.
|
||||
__DSB();
|
||||
|
||||
const uint32_t regions = (MPU->TYPE & MPU_TYPE_DREGION_Msk) >> MPU_TYPE_DREGION_Pos;
|
||||
|
||||
// Disable the MCU
|
||||
MPU->CTRL = 0;
|
||||
|
||||
// Reset all mapping
|
||||
for (uint32_t i = 0; i < regions; i++) {
|
||||
ARM_MPU_ClrRegion(i);
|
||||
}
|
||||
|
||||
if (!enable) {
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* ARMv6m and ARMv7m memory map:
|
||||
*
|
||||
* Start End Name Executable by default Mbed MPU protection
|
||||
* 0x00000000 - 0x1FFFFFFF Code Yes Execute disabled for second half
|
||||
* 0x20000000 - 0x3FFFFFFF SRAM Yes Execute disabled
|
||||
* 0x40000000 - 0x5FFFFFFF Peripheral No
|
||||
* 0x60000000 - 0x7FFFFFFF RAM Yes Execute disabled
|
||||
* 0x80000000 - 0x9FFFFFFF RAM Yes Execute disabled
|
||||
* 0xA0000000 - 0xBFFFFFFF Device No
|
||||
* 0xC0000000 - 0xDFFFFFFF Device No
|
||||
* 0xE0000000 - 0xFFFFFFFF System No
|
||||
*/
|
||||
|
||||
if (regions >= 3) {
|
||||
// Select region 0 and used it for the WT rom region
|
||||
// - RAM 0x10000000 - 0x1FFFFFFF
|
||||
MPU->RNR = 0;
|
||||
// Set address to 0
|
||||
MPU->RBAR = 0;
|
||||
// Configure and enable region
|
||||
MPU->RASR =
|
||||
MPU_RASR_ENABLE_Msk |
|
||||
ARM_MPU_RASR(
|
||||
1, // DisableExec
|
||||
ARM_MPU_AP_FULL, // AccessPermission
|
||||
0, // TypeExtField
|
||||
0, // IsShareable
|
||||
1, // IsCacheable
|
||||
0, // IsBufferable
|
||||
// SubRegionDisable
|
||||
(1 << 0) | // Disable Sub-region
|
||||
(1 << 1) | // Disable Sub-region
|
||||
(1 << 2) | // Disable Sub-region
|
||||
(1 << 3) | // Disable Sub-region
|
||||
(0 << 4) | // Enable Sub-region RAM 0x10000000 - 0x1FFFFFFF
|
||||
(0 << 5) |
|
||||
(0 << 6) |
|
||||
(0 << 7),
|
||||
ARM_MPU_REGION_SIZE_512MB // Size
|
||||
);
|
||||
|
||||
// Select region 1 and used it for WBWA ram regions
|
||||
// - SRAM 0x20000000 - 0x3FFFFFFF
|
||||
// - RAM 0x60000000 - 0x7FFFFFFF
|
||||
MPU->RNR = 1;
|
||||
// Set address to 0
|
||||
MPU->RBAR = 0;
|
||||
// Configure and enable region
|
||||
MPU->RASR =
|
||||
MPU_RASR_ENABLE_Msk |
|
||||
ARM_MPU_RASR(
|
||||
1, // DisableExec
|
||||
ARM_MPU_AP_FULL, // AccessPermission
|
||||
1, // TypeExtField
|
||||
0, // IsShareable
|
||||
1, // IsCacheable
|
||||
1, // IsBufferable
|
||||
// SubRegionDisable
|
||||
(1 << 0) | // Disable Sub-region
|
||||
(0 << 1) | // Enable Sub-region SRAM 0x20000000 - 0x3FFFFFFF
|
||||
(1 << 2) | // Disable Sub-region
|
||||
(0 << 3) | // Enable Sub-region RAM 0x60000000 - 0x7FFFFFFF
|
||||
(1 << 4) | // Disable Sub-region
|
||||
(1 << 5) | // Disable Sub-region
|
||||
(1 << 6) | // Disable Sub-region
|
||||
(1 << 7), // Disable Sub-region
|
||||
ARM_MPU_REGION_SIZE_4GB // Size
|
||||
);
|
||||
|
||||
// Select region 2 and used it for the WT ram region
|
||||
// - RAM RAM 0x80000000 - 0x9FFFFFFF
|
||||
MPU->RNR = 2;
|
||||
// Set address
|
||||
MPU->RBAR = 0x80000000;
|
||||
// Configure and enable region
|
||||
MPU->RASR =
|
||||
MPU_RASR_ENABLE_Msk |
|
||||
ARM_MPU_RASR(
|
||||
1, // DisableExec
|
||||
ARM_MPU_AP_FULL, // AccessPermission
|
||||
0, // TypeExtField
|
||||
0, // IsShareable
|
||||
1, // IsCacheable
|
||||
0, // IsBufferable
|
||||
~0U, // SubRegionDisable
|
||||
ARM_MPU_REGION_SIZE_512MB // Size
|
||||
);
|
||||
}
|
||||
|
||||
// Enable the MPU
|
||||
MPU->CTRL =
|
||||
(1 << MPU_CTRL_PRIVDEFENA_Pos) | // Use the default memory map for unmapped addresses
|
||||
(1 << MPU_CTRL_HFNMIENA_Pos) | // Keep MPU turned on for faults
|
||||
(1 << MPU_CTRL_ENABLE_Pos); // Enable MPU
|
||||
|
||||
// Ensure changes take effect
|
||||
__ISB();
|
||||
__DSB();
|
||||
#endif
|
||||
}
|
||||
|
|
@ -0,0 +1,80 @@
|
|||
|
||||
/** \addtogroup hal */
|
||||
/** @{*/
|
||||
/* mbed Microcontroller Library
|
||||
* Copyright (c) 2018-2018 ARM Limited
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
#ifndef MBED_MPU_API_H
|
||||
#define MBED_MPU_API_H
|
||||
|
||||
#include <stdbool.h>
|
||||
#include "cmsis.h"
|
||||
|
||||
#ifndef MBED_MPU_ENABLED
|
||||
|
||||
#if ((__ARM_ARCH_7M__ == 1U) || \
|
||||
(__ARM_ARCH_7EM__ == 1U) || \
|
||||
(__ARM_ARCH_6M__ == 1U))
|
||||
#if defined (__MPU_PRESENT) && (__MPU_PRESENT == 1U)
|
||||
#define MBED_MPU_ENABLED 1U
|
||||
#else
|
||||
#define MBED_MPU_ENABLED 0U
|
||||
#endif
|
||||
#elif ((__ARM_ARCH_7A__ == 1U) || \
|
||||
(__ARM_ARCH_8M_BASE__ == 1U) || \
|
||||
(__ARM_ARCH_8M_MAIN__ == 1U))
|
||||
#define MBED_MPU_ENABLED 0U
|
||||
#else
|
||||
#error "Unknown architecture for MPU"
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
/**
|
||||
* Initialize the MPU
|
||||
*
|
||||
* Initialize or re-initialize the memory protection unit.
|
||||
* It is implementation defined what region are protected
|
||||
* by the MPU after initialization.
|
||||
*/
|
||||
void mbed_mpu_init(void);
|
||||
|
||||
/**
|
||||
* Enable or disable ram MPU protection
|
||||
*
|
||||
* This function is used to mark all of RAM as execute never.
|
||||
* When enabled code is only allowed to execute from flash.
|
||||
*
|
||||
* @param enable true to disable execution in ram, false otherwise
|
||||
*/
|
||||
void mbed_mpu_enable_ram_xn(bool enable);
|
||||
|
||||
/** Deinitialize the MPU
|
||||
*
|
||||
* Powerdown the MPU in preparation for powerdown, reset or jumping to another application.
|
||||
*/
|
||||
void mbed_mpu_free(void);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
||||
/** @}*/
|
||||
Loading…
Reference in New Issue