mirror of https://github.com/ARMmbed/mbed-os.git
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
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/* mbed Microcontroller Library
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* Copyright (c) 2018 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_error.h"
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#include "hal/mpu_api.h"
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#include <limits.h>
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static uint16_t mem_xn_lock;
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void mbed_mpu_manager_lock_mem_xn()
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{
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core_util_critical_section_enter();
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if (mem_xn_lock == USHRT_MAX) {
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core_util_critical_section_exit();
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MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_PLATFORM, MBED_ERROR_CODE_OVERFLOW), "Memory execute never lock overflow (> USHRT_MAX)", mem_xn_lock);
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}
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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_mem_xn()
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{
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core_util_critical_section_enter();
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if (mem_xn_lock == 0) {
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core_util_critical_section_exit();
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MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_PLATFORM, MBED_ERROR_CODE_UNDERFLOW), "Memory execute never lock underflow (< 0)", mem_xn_lock);
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}
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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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