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81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
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* Copyright (c) 2016-2018, Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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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 "arm_hal_interrupt.h"
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#include "arm_hal_interrupt_private.h"
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#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
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#include "platform/mbed_critical.h"
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#else
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#include "cmsis_os2.h"
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#include "mbed_rtos_storage.h"
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#endif
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#include <mbed_assert.h>
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// The critical section has two alternative implementations, the default which uses mutex
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// as locking primitive and the optional, which will bluntly disable interrupts
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// for the critical section. The mutex version will not cause issues by delaying
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// interrupts, but it has a down side that it can not be used from the interrupt
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// service routines. The IRQ-safe version will do the mutual exclusion by temporarily
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// disabling the interrupts, so it will have effect on interrupt latency.
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#if !MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
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static uint8_t sys_irq_disable_counter;
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static mbed_rtos_storage_mutex_t critical_mutex;
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static const osMutexAttr_t critical_mutex_attr = {
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.name = "nanostack_critical_mutex",
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.attr_bits = osMutexRecursive | osMutexPrioInherit | osMutexRobust,
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.cb_mem = &critical_mutex,
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.cb_size = sizeof critical_mutex,
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};
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static osMutexId_t critical_mutex_id;
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#endif
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void platform_critical_init(void)
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{
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#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
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// nothing to do here
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#else
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critical_mutex_id = osMutexNew(&critical_mutex_attr);
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MBED_ASSERT(critical_mutex_id);
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#endif
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}
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void platform_enter_critical(void)
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{
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#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
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core_util_critical_section_enter();
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#else
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osMutexAcquire(critical_mutex_id, osWaitForever);
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sys_irq_disable_counter++;
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#endif
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}
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void platform_exit_critical(void)
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{
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#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
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core_util_critical_section_exit();
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#else
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--sys_irq_disable_counter;
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osMutexRelease(critical_mutex_id);
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#endif
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}
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