mirror of https://github.com/ARMmbed/mbed-os.git
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
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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"); you may
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* 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, WITHOUT
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* 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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/* Declare __STDC_LIMIT_MACROS so stdint.h defines UINT32_MAX when using C++ */
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#define __STDC_LIMIT_MACROS
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#include "hal/critical_section_api.h"
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#include "cmsis.h"
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#include "platform/mbed_assert.h"
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#include "platform/mbed_critical.h"
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#include "platform/mbed_toolchain.h"
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static uint32_t critical_section_reentrancy_counter = 0;
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bool core_util_are_interrupts_enabled(void)
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{
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#if defined(__CORTEX_A9)
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return ((__get_CPSR() & 0x80) == 0);
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#else
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return ((__get_PRIMASK() & 0x1) == 0);
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#endif
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}
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bool core_util_is_isr_active(void)
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{
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#if defined(__CORTEX_A9)
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switch (__get_CPSR() & 0x1FU) {
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case CPSR_M_USR:
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case CPSR_M_SYS:
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return false;
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case CPSR_M_SVC:
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default:
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return true;
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}
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#else
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return (__get_IPSR() != 0U);
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#endif
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}
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bool core_util_in_critical_section(void)
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{
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return hal_in_critical_section();
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}
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void core_util_critical_section_enter(void)
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{
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hal_critical_section_enter();
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// If the reentrancy counter overflows something has gone badly wrong.
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MBED_ASSERT(critical_section_reentrancy_counter < UINT32_MAX);
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++critical_section_reentrancy_counter;
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}
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void core_util_critical_section_exit(void)
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{
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// If critical_section_enter has not previously been called, do nothing
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if (critical_section_reentrancy_counter == 0) {
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return;
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}
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--critical_section_reentrancy_counter;
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if (critical_section_reentrancy_counter == 0) {
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hal_critical_section_exit();
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}
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}
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