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critical.c
00001 // ---------------------------------------------------------------------------- 00002 // Copyright 2015-2017 ARM Ltd. 00003 // 00004 // SPDX-License-Identifier: Apache-2.0 00005 // 00006 // Licensed under the Apache License, Version 2.0 (the "License"); 00007 // you may not use this file except in compliance with the License. 00008 // You may obtain a copy of the License at 00009 // 00010 // http://www.apache.org/licenses/LICENSE-2.0 00011 // 00012 // Unless required by applicable law or agreed to in writing, software 00013 // distributed under the License is distributed on an "AS IS" BASIS, 00014 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00015 // See the License for the specific language governing permissions and 00016 // limitations under the License. 00017 // ---------------------------------------------------------------------------- 00018 00019 // This critical section implementation is generic for mbed OS targets, 00020 // except Nordic ones 00021 #if defined(TARGET_LIKE_MBED) && !defined(TARGET_NORDIC) 00022 00023 #include <stdint.h> // uint32_t, UINT32_MAX 00024 #include <stddef.h> // NULL 00025 00026 #if defined(YOTTA_CFG_MBED_OS) 00027 #include "cmsis-core/core_generic.h" //__disable_irq, __enable_irq 00028 #else 00029 #include "cmsis.h" 00030 #endif 00031 00032 #include <assert.h> 00033 00034 // Module include 00035 #include "aq_critical.h" 00036 00037 static volatile uint32_t interruptEnableCounter = 0; 00038 static volatile uint32_t critical_primask = 0; 00039 00040 void aq_critical_section_enter() 00041 { 00042 uint32_t primask = __get_PRIMASK(); // get the current interrupt enabled state 00043 __disable_irq(); 00044 00045 // Save the interrupt enabled state as it was prior to any nested critical section lock use 00046 if (!interruptEnableCounter) { 00047 critical_primask = primask & 0x1; 00048 } 00049 00050 /* If the interruptEnableCounter overflows or we are in a nested critical section and interrupts 00051 are enabled, then something has gone badly wrong thus assert an error. 00052 */ 00053 00054 /* FIXME: This assertion needs to be commented out for the moment, as it 00055 * triggers a fault when uVisor is enabled. For more information on 00056 * the fault please checkout ARMmbed/mbed-drivers#176. */ 00057 /* assert(interruptEnableCounter < UINT32_MAX); */ 00058 if (interruptEnableCounter > 0) { 00059 /* FIXME: This assertion needs to be commented out for the moment, as it 00060 * triggers a fault when uVisor is enabled. For more information 00061 * on the fault please checkout ARMmbed/mbed-drivers#176. */ 00062 /* assert(primask & 0x1); */ 00063 } 00064 interruptEnableCounter++; 00065 } 00066 00067 void aq_critical_section_exit() 00068 { 00069 // If critical_section_enter has not previously been called, do nothing 00070 if (interruptEnableCounter) { 00071 00072 uint32_t primask = __get_PRIMASK(); // get the current interrupt enabled state 00073 00074 /* FIXME: This assertion needs to be commented out for the moment, as it 00075 * triggers a fault when uVisor is enabled. For more information 00076 * on the fault please checkout ARMmbed/mbed-drivers#176. */ 00077 /* assert(primask & 0x1); // Interrupts must be disabled on invoking an exit from a critical section */ 00078 00079 interruptEnableCounter--; 00080 00081 /* Only re-enable interrupts if we are exiting the last of the nested critical sections and 00082 interrupts were enabled on entry to the first critical section. 00083 */ 00084 if (!interruptEnableCounter && !critical_primask) { 00085 __enable_irq(); 00086 } 00087 } 00088 } 00089 00090 #endif // defined(TARGET_LIKE_MBED) && !defined(TARGET_NORDIC)
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