Import of the watch repository from Pebble

src/fw/applib/cpu_cache.h

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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.
+ */
+
+#pragma once
+
+#include <stddef.h>
+
+//! @file cpu_cache.h
+//! @addtogroup Foundation
+//! @{
+//!   @addtogroup MemoryManagement Memory Management
+//!   \brief Utility functions for managing an application's memory.
+//!
+//!   @{
+
+//! Flushes the data cache and invalidates the instruction cache for the given region of memory,
+//! if necessary. This is only required when your app is loading or modifying code in memory and
+//! intends to execute it. On some platforms, code executed may be cached internally to improve
+//! performance. After writing to memory, but before executing, this function must be called in
+//! order to avoid undefined behavior. On platforms without caching, this performs no operation.
+//! @param start The beginning of the buffer to flush
+//! @param size How many bytes to flush
+void memory_cache_flush(void *start, size_t size);
+
+//!   @} // end addtogroup MemoryManagement
+//! @} // end addtogroup Foundation