1 files changed, 87 insertions, 0 deletions
diff --git a/libtransport/includes/hicn/transport/portability/cache.h b/libtransport/includes/hicn/transport/portability/cache.h
new file mode 100644
index 000000000..ae113c7d6
--- /dev/null
+++ b/libtransport/includes/hicn/transport/portability/cache.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2022 Cisco and/or its affiliates.
+ *
+ * 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 <hicn/transport/portability/platform.h>
+
+namespace transport {
+namespace portability {
+namespace cache {
+
+/**
+ * @Prefetch utilities
+ */
+
+/* Default cache line size of 64 bytes. */
+#ifndef LOG2_CACHE_LINE_BYTES
+static constexpr const std::size_t klog2_cache_line_bytes = 6;
+#else
+static constexpr const std::size_t klog2_cache_line_bytes =
+    LOG2_CACHE_LINE_BYTES;
+#endif
+
+/* How much data prefetch instruction prefetches */
+#ifndef LOG2_CACHE_PREFETCH_BYTES
+static constexpr const std::size_t klog2_cache_prefetch_bytes =
+    klog2_cache_line_bytes;
+#else
+static constexpr const std::size_t klog2_cache_prefetch_bytes =
+    LOG2_CACHE_PREFETCH_BYTES;
+#endif
+
+/* Default cache line fill buffers. */
+#ifndef N_PREFETCHES
+static constexpr const std::size_t kn_prefetches = 16;
+#else
+static constexpr const std::size_t kn_prefetches = N_PREFETCHES;
+#endif
+
+static constexpr const std::size_t kcache_line_bytes =
+    (1 << klog2_cache_line_bytes);
+static constexpr const std::size_t kcache_prefetch_bytes =
+    (1 << klog2_cache_prefetch_bytes);
+
+static constexpr const int READ = 0;
+static constexpr const int LOAD = 0; /* alias for read */
+static constexpr const int WRITE = 1;
+static constexpr const int STORE = 1; /* alias for write */
+
+#if defined(__GNUC__) || defined(__clang__)
+// Clang & GCC
+
+template <int type>
+static inline void _prefetch(uint8_t *addr, std::size_t n, std::size_t size) {
+  if (size > n * kcache_prefetch_bytes) {
+    __builtin_prefetch(addr + n * kcache_prefetch_bytes, type,
+                       /* locality */ 3);
+  }
+}
+
+template <typename T, int type>
+static inline void prefetch(T *addr, std::size_t size) {
+  uint8_t *_addr = reinterpret_cast<uint8_t *>(addr);
+
+  _prefetch<type>(_addr, 0, size);
+  _prefetch<type>(_addr, 1, size);
+  _prefetch<type>(_addr, 2, size);
+  _prefetch<type>(_addr, 3, size);
+}
+#endif
+
+}  // namespace cache
+}  // namespace portability
+}  // namespace transport
+\ No newline at end of file