Toyomasa Watarai / simple-mbed-cloud-client

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Dependents:  

mbed-cloud-client/update-client-hub/modules/atomic-queue/source/atomic-cm3.c@0:276e7a263c35, 2018-07-02 (annotated)

Committer:
MACRUM
Date:
Mon Jul 02 06:30:39 2018 +0000
Revision:
0:276e7a263c35
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MACRUM 0:276e7a263c35 1 // ----------------------------------------------------------------------------
MACRUM 0:276e7a263c35 2 // Copyright 2015-2017 ARM Ltd.
MACRUM 0:276e7a263c35 3 //
MACRUM 0:276e7a263c35 4 // SPDX-License-Identifier: Apache-2.0
MACRUM 0:276e7a263c35 5 //
MACRUM 0:276e7a263c35 6 // Licensed under the Apache License, Version 2.0 (the "License");
MACRUM 0:276e7a263c35 7 // you may not use this file except in compliance with the License.
MACRUM 0:276e7a263c35 8 // You may obtain a copy of the License at
MACRUM 0:276e7a263c35 9 //
MACRUM 0:276e7a263c35 10 // http://www.apache.org/licenses/LICENSE-2.0
MACRUM 0:276e7a263c35 11 //
MACRUM 0:276e7a263c35 12 // Unless required by applicable law or agreed to in writing, software
MACRUM 0:276e7a263c35 13 // distributed under the License is distributed on an "AS IS" BASIS,
MACRUM 0:276e7a263c35 14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MACRUM 0:276e7a263c35 15 // See the License for the specific language governing permissions and
MACRUM 0:276e7a263c35 16 // limitations under the License.
MACRUM 0:276e7a263c35 17 // ----------------------------------------------------------------------------
MACRUM 0:276e7a263c35 18
MACRUM 0:276e7a263c35 19 #include "atomic.h"
MACRUM 0:276e7a263c35 20
MACRUM 0:276e7a263c35 21 #if defined(TARGET_LIKE_MBED)
MACRUM 0:276e7a263c35 22 #include "cmsis.h"
MACRUM 0:276e7a263c35 23 #endif
MACRUM 0:276e7a263c35 24
MACRUM 0:276e7a263c35 25 #if defined(__CORTEX_M) && (__CORTEX_M >= 0x03)
MACRUM 0:276e7a263c35 26
MACRUM 0:276e7a263c35 27 #define STATIC_ASSERT(STATIC_ASSERT_FAILED,MSG)\
MACRUM 0:276e7a263c35 28 switch(0){\
MACRUM 0:276e7a263c35 29 case 0:case (STATIC_ASSERT_FAILED): \
MACRUM 0:276e7a263c35 30 break;}
MACRUM 0:276e7a263c35 31
MACRUM 0:276e7a263c35 32 #include <stddef.h>
MACRUM 0:276e7a263c35 33 #include <stdint.h>
MACRUM 0:276e7a263c35 34
MACRUM 0:276e7a263c35 35 int aq_atomic_cas_deref_uintptr(uintptr_t* volatile * ptrAddr,
MACRUM 0:276e7a263c35 36 uintptr_t** currentPtrValue,
MACRUM 0:276e7a263c35 37 uintptr_t expectedDerefValue,
MACRUM 0:276e7a263c35 38 uintptr_t* newPtrValue,
MACRUM 0:276e7a263c35 39 uintptr_t valueOffset)
MACRUM 0:276e7a263c35 40 {
MACRUM 0:276e7a263c35 41 STATIC_ASSERT(sizeof(uintptr_t) == sizeof(uint32_t), Error: Pointer size mismatch)
MACRUM 0:276e7a263c35 42 uint32_t *current;
MACRUM 0:276e7a263c35 43 current = (uint32_t *)__LDREXW((volatile uint32_t *)ptrAddr);
MACRUM 0:276e7a263c35 44 if (currentPtrValue != NULL) {
MACRUM 0:276e7a263c35 45 *currentPtrValue = (uintptr_t *)current;
MACRUM 0:276e7a263c35 46 }
MACRUM 0:276e7a263c35 47 if (current == NULL) {
MACRUM 0:276e7a263c35 48 return AQ_ATOMIC_CAS_DEREF_NULLPTR;
MACRUM 0:276e7a263c35 49 } else if ( *(uint32_t *)((uintptr_t)current + valueOffset) != expectedDerefValue) {
MACRUM 0:276e7a263c35 50 return AQ_ATOMIC_CAS_DEREF_VALUE;
MACRUM 0:276e7a263c35 51 } else if(__STREXW((uint32_t)newPtrValue, (volatile uint32_t *)ptrAddr)) {
MACRUM 0:276e7a263c35 52 return AQ_ATOMIC_CAS_DEREF_INTERUPTED;
MACRUM 0:276e7a263c35 53 } else {
MACRUM 0:276e7a263c35 54 return AQ_ATOMIC_CAS_DEREF_SUCCESS;
MACRUM 0:276e7a263c35 55 }
MACRUM 0:276e7a263c35 56 }
MACRUM 0:276e7a263c35 57 #endif
MACRUM 0:276e7a263c35 58