Denislam Valeev / Mbed OS Nucleo_rtos_basic

1

mbed-os/hal/mbed_critical_section_api.c@0:e056ac8fecf8, 2018-03-13 (annotated)

Committer:
valeyev
Date:
Tue Mar 13 07:17:50 2018 +0000
Revision:
0:e056ac8fecf8
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valeyev 0:e056ac8fecf8 1 /* mbed Microcontroller Library
valeyev 0:e056ac8fecf8 2 * Copyright (c) 2017 ARM Limited
valeyev 0:e056ac8fecf8 3 *
valeyev 0:e056ac8fecf8 4 * Licensed under the Apache License, Version 2.0 (the "License");
valeyev 0:e056ac8fecf8 5 * you may not use this file except in compliance with the License.
valeyev 0:e056ac8fecf8 6 * You may obtain a copy of the License at
valeyev 0:e056ac8fecf8 7 *
valeyev 0:e056ac8fecf8 8 * http://www.apache.org/licenses/LICENSE-2.0
valeyev 0:e056ac8fecf8 9 *
valeyev 0:e056ac8fecf8 10 * Unless required by applicable law or agreed to in writing, software
valeyev 0:e056ac8fecf8 11 * distributed under the License is distributed on an "AS IS" BASIS,
valeyev 0:e056ac8fecf8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
valeyev 0:e056ac8fecf8 13 * See the License for the specific language governing permissions and
valeyev 0:e056ac8fecf8 14 * limitations under the License.
valeyev 0:e056ac8fecf8 15 */
valeyev 0:e056ac8fecf8 16 #include "cmsis.h"
valeyev 0:e056ac8fecf8 17 #include "hal/critical_section_api.h"
valeyev 0:e056ac8fecf8 18 #include "platform/mbed_assert.h"
valeyev 0:e056ac8fecf8 19 #include "platform/mbed_toolchain.h"
valeyev 0:e056ac8fecf8 20
valeyev 0:e056ac8fecf8 21 #include <stdbool.h>
valeyev 0:e056ac8fecf8 22
valeyev 0:e056ac8fecf8 23 static volatile bool critical_interrupts_enabled = false;
valeyev 0:e056ac8fecf8 24 static volatile bool state_saved = false;
valeyev 0:e056ac8fecf8 25
valeyev 0:e056ac8fecf8 26 static bool are_interrupts_enabled(void)
valeyev 0:e056ac8fecf8 27 {
valeyev 0:e056ac8fecf8 28 #if defined(__CORTEX_A9)
valeyev 0:e056ac8fecf8 29 return ((__get_CPSR() & 0x80) == 0);
valeyev 0:e056ac8fecf8 30 #else
valeyev 0:e056ac8fecf8 31 return ((__get_PRIMASK() & 0x1) == 0);
valeyev 0:e056ac8fecf8 32 #endif
valeyev 0:e056ac8fecf8 33 }
valeyev 0:e056ac8fecf8 34
valeyev 0:e056ac8fecf8 35
valeyev 0:e056ac8fecf8 36 MBED_WEAK void hal_critical_section_enter(void)
valeyev 0:e056ac8fecf8 37 {
valeyev 0:e056ac8fecf8 38 const bool interrupt_state = are_interrupts_enabled();
valeyev 0:e056ac8fecf8 39
valeyev 0:e056ac8fecf8 40 __disable_irq();
valeyev 0:e056ac8fecf8 41
valeyev 0:e056ac8fecf8 42 if (state_saved == true) {
valeyev 0:e056ac8fecf8 43 return;
valeyev 0:e056ac8fecf8 44 }
valeyev 0:e056ac8fecf8 45
valeyev 0:e056ac8fecf8 46 critical_interrupts_enabled = interrupt_state;
valeyev 0:e056ac8fecf8 47 state_saved = true;
valeyev 0:e056ac8fecf8 48 }
valeyev 0:e056ac8fecf8 49
valeyev 0:e056ac8fecf8 50 MBED_WEAK void hal_critical_section_exit(void)
valeyev 0:e056ac8fecf8 51 {
valeyev 0:e056ac8fecf8 52 #ifndef FEATURE_UVISOR
valeyev 0:e056ac8fecf8 53 // Interrupts must be disabled on invoking an exit from a critical section
valeyev 0:e056ac8fecf8 54 MBED_ASSERT(!are_interrupts_enabled());
valeyev 0:e056ac8fecf8 55 #endif
valeyev 0:e056ac8fecf8 56 state_saved = false;
valeyev 0:e056ac8fecf8 57
valeyev 0:e056ac8fecf8 58 // Restore the IRQs to their state prior to entering the critical section
valeyev 0:e056ac8fecf8 59 if (critical_interrupts_enabled == true) {
valeyev 0:e056ac8fecf8 60 __enable_irq();
valeyev 0:e056ac8fecf8 61 }
valeyev 0:e056ac8fecf8 62 }
valeyev 0:e056ac8fecf8 63
valeyev 0:e056ac8fecf8 64 MBED_WEAK bool hal_in_critical_section(void)
valeyev 0:e056ac8fecf8 65 {
valeyev 0:e056ac8fecf8 66 return (state_saved == true);
valeyev 0:e056ac8fecf8 67 }