mirror of https://github.com/ARMmbed/mbed-os.git
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2018-2019 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "platform/mbed_mpu_mgmt.h"
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#include "platform/mbed_critical.h"
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#include "platform/mbed_assert.h"
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#include <limits.h>
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#include <stdbool.h>
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#if DEVICE_MPU && MBED_CONF_PLATFORM_USE_MPU
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static uint16_t mem_xn_lock;
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static uint16_t mem_wn_lock;
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void mbed_mpu_manager_lock_ram_execution()
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{
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core_util_critical_section_enter();
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MBED_ASSERT(mem_xn_lock != USHRT_MAX);
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if (mem_xn_lock == 0) {
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mbed_mpu_enable_ram_xn(false);
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}
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mem_xn_lock++;
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core_util_critical_section_exit();
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}
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void mbed_mpu_manager_unlock_ram_execution()
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{
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core_util_critical_section_enter();
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MBED_ASSERT(mem_xn_lock != 0);
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mem_xn_lock--;
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if (mem_xn_lock == 0) {
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mbed_mpu_enable_ram_xn(true);
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}
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core_util_critical_section_exit();
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}
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void mbed_mpu_manager_lock_rom_write()
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{
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core_util_critical_section_enter();
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MBED_ASSERT(mem_wn_lock != USHRT_MAX);
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if (mem_wn_lock == 0) {
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mbed_mpu_enable_rom_wn(false);
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}
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mem_wn_lock++;
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core_util_critical_section_exit();
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}
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void mbed_mpu_manager_unlock_rom_write()
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{
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core_util_critical_section_enter();
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MBED_ASSERT(mem_wn_lock != 0);
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mem_wn_lock--;
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if (mem_wn_lock == 0) {
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mbed_mpu_enable_rom_wn(true);
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}
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core_util_critical_section_exit();
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}
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#endif
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