chore: import upstream snapshot with attribution

third_party/hexagon/BUILD

@@ -0,0 +1 @@
+# copybara:uncomment package(default_applicable_licenses = ["//tensorflow:license"])

third_party/hexagon/hexagon.BUILD

@@ -0,0 +1,137 @@
+# Copyright 2019 The TensorFlow Authors. All Rights Reserved.
+#
+# 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.
+# ==============================================================================
+
+package(default_visibility = [
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # BSD-3-Clause-Clear
+])
+
+exports_files(glob(["hexagon/**/*.so"]))
+
+#Just header file, needed for data types in the interface.
+cc_library(
+    name = "hexagon_nn_header",
+    hdrs = [
+        "@hexagon_nn//:hexagon/hexagon_nn.h",
+    ],
+    tags = [
+        "manual",
+        "nobuilder",
+    ],
+)
+
+cc_library(
+    name = "hexagon_nn_ops",
+    hdrs = [
+        "@hexagon_nn//:hexagon/hexagon_nn_ops.h",
+        "@hexagon_nn//:hexagon/ops.def",
+    ],
+    tags = [
+        "manual",
+        "nobuilder",
+    ],
+)
+
+cc_library(
+    name = "remote",
+    hdrs = [
+        "@hexagon_nn//:hexagon/remote.h",
+        "@hexagon_nn//:hexagon/remote64.h",
+    ],
+    tags = [
+        "manual",
+        "nobuilder",
+    ],
+)
+
+cc_library(
+    name = "rpcmem",
+    srcs = [
+        "@hexagon_nn//:hexagon/rpcmem_stub.c",
+    ],
+    hdrs = [
+        "@hexagon_nn//:hexagon/rpcmem.h",
+    ],
+    deps = [
+        ":AEEStdDef",
+    ],
+)
+
+cc_library(
+    name = "hexagon_soc",
+    hdrs = [
+        "@hexagon_nn//:hexagon/hexnn_soc_defines.h",
+    ],
+    tags = [
+        "manual",
+        "nobuilder",
+    ],
+)
+
+cc_library(
+    name = "AEEStdDef",
+    hdrs = [
+        "@hexagon_nn//:hexagon/AEEStdDef.h",
+    ],
+    tags = [
+        "manual",
+        "nobuilder",
+    ],
+)
+
+cc_library(
+    name = "AEEStdErr",
+    hdrs = [
+        "@hexagon_nn//:hexagon/AEEStdErr.h",
+    ],
+)
+
+# The files are included in another .c files, so we add the src files as textual_hdrs
+# to avoid compiling them and have linking errors for multiple symbols.
+cc_library(
+    name = "hexagon_stub",
+    textual_hdrs = [
+        "@hexagon_nn//:hexagon/hexagon_nn_domains_stub.c",
+        "@hexagon_nn//:hexagon/hexagon_nn_stub.c",
+    ],
+)
+
+# This rule uses the smart/graph wrapper interfaces.
+cc_library(
+    name = "hexagon_nn",
+    srcs = [
+        "@hexagon_nn//:hexagon/hexagon_nn.h",
+        "@hexagon_nn//:hexagon/hexnn_dsp_api.h",
+        "@hexagon_nn//:hexagon/hexnn_dsp_api_impl.c",
+        "@hexagon_nn//:hexagon/hexnn_dsp_domains_api.h",
+        "@hexagon_nn//:hexagon/hexnn_dsp_domains_api_impl.c",
+        "@hexagon_nn//:hexagon/hexnn_dsp_smart_wrapper_api.c",
+        "@hexagon_nn//:hexagon/hexnn_dsp_smart_wrapper_api.h",
+        "@hexagon_nn//:hexagon/hexnn_graph_wrapper.cpp",
+        "@hexagon_nn//:hexagon/hexnn_graph_wrapper.hpp",
+        "@hexagon_nn//:hexagon/hexnn_graph_wrapper_interface.h",
+        "@hexagon_nn//:hexagon/hexnn_soc_defines.h",
+    ],
+    deps = [
+        ":AEEStdErr",
+        ":hexagon_stub",
+        ":remote",
+        ":rpcmem",
+    ],
+    alwayslink = 1,
+)

third_party/hexagon/workspace.bzl

@@ -0,0 +1,17 @@
+"""Loads the Hexagon NN Header files library, used by TF Lite."""
+
+load("//third_party:repo.bzl", "tf_http_archive")
+
+# Note: Use libhexagon_nn_skel version 1.20.0.1 Only with the current version.
+# This comment will be updated with compatible version.
+def repo():
+    tf_http_archive(
+        name = "hexagon_nn",
+        sha256 = "f577b4c150b72e11e9dfb3f9d14f9772ba8fe460f7d65c84a7327ea9bef44d8e",
+        urls = [
+            "https://storage.googleapis.com/mirror.tensorflow.org/storage.cloud.google.com/download.tensorflow.org/tflite/hexagon_nn_headers_v1.20.0.9.tgz",
+            # Repeated to bypass 'at least two urls' check. TODO(karimnosseir): add original source of this package.
+            "https://storage.googleapis.com/mirror.tensorflow.org/storage.cloud.google.com/download.tensorflow.org/tflite/hexagon_nn_headers_v1.20.0.9.tgz",
+        ],
+        build_file = "//third_party/hexagon:hexagon.BUILD",
+    )