Diff: simple-mbed-cloud-client/mbed-cloud-client/update-client-hub/modules/atomic-queue/source/atomic-cm3.c

Revision:

0:25fa8795676b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simple-mbed-cloud-client/mbed-cloud-client/update-client-hub/modules/atomic-queue/source/atomic-cm3.c	Sun Apr 18 15:20:23 2021 +0000
@@ -0,0 +1,58 @@
+// ----------------------------------------------------------------------------
+// Copyright 2015-2017 ARM Ltd.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ----------------------------------------------------------------------------
+
+#include "atomic.h"
+
+#if defined(TARGET_LIKE_MBED)
+#include "cmsis.h"
+#endif
+
+#if defined(__CORTEX_M) && (__CORTEX_M >= 0x03)
+
+#define STATIC_ASSERT(STATIC_ASSERT_FAILED,MSG)\
+    switch(0){\
+        case 0:case (STATIC_ASSERT_FAILED): \
+        break;}
+
+#include <stddef.h>
+#include <stdint.h>
+
+int aq_atomic_cas_deref_uintptr(uintptr_t *volatile *ptrAddr,
+                                uintptr_t **currentPtrValue,
+                                uintptr_t expectedDerefValue,
+                                uintptr_t *newPtrValue,
+                                uintptr_t valueOffset)
+{
+    STATIC_ASSERT(sizeof(uintptr_t) == sizeof(uint32_t), Error: Pointer size mismatch)
+    uint32_t *current;
+    current = (uint32_t *)__LDREXW((volatile uint32_t *)ptrAddr);
+    if (currentPtrValue != NULL) {
+        *currentPtrValue = (uintptr_t *)current;
+    }
+    if (current == NULL) {
+        return AQ_ATOMIC_CAS_DEREF_NULLPTR;
+    } else if (*(uint32_t *)((uintptr_t)current + valueOffset) != expectedDerefValue) {
+        return AQ_ATOMIC_CAS_DEREF_VALUE;
+    } else if (__STREXW((uint32_t)newPtrValue, (volatile uint32_t *)ptrAddr)) {
+        return AQ_ATOMIC_CAS_DEREF_INTERUPTED;
+    } else {
+        return AQ_ATOMIC_CAS_DEREF_SUCCESS;
+    }
+}
+#endif
+