Add IMemoryToken and the HidlMemoryToken

The IMemoryToken is an interface which composes shared memory.
It provides a get() method, which returns an instance of hidl_memory
that always refer to the same memory.

The HidlMemoryToken is an implementation of the IMemoryToken.

Bug: 69640337
Test: hidl_test
Change-Id: Ida32a7971ba31e99f724c18159cf2e1f699b73b8

2 files changed, 44 insertions, 0 deletions

diff --git a/transport/memory/token/1.0/Android.bp b/transport/memory/token/1.0/Android.bp
new file mode 100644
index 0000000..6fc1af6
--- /dev/null
+++ b/transport/memory/token/1.0/Android.bp
@@ -0,0 +1,17 @@
+// This file is autogenerated by hidl-gen -Landroidbp.
+
+hidl_interface {
+    name: "android.hidl.memory.token@1.0",
+    root: "android.hidl",
+    vndk: {
+        enabled: true,
+    },
+    srcs: [
+        "IMemoryToken.hal",
+    ],
+    interfaces: [
+        "android.hidl.base@1.0",
+    ],
+    gen_java: false,
+}
+
diff --git a/transport/memory/token/1.0/IMemoryToken.hal b/transport/memory/token/1.0/IMemoryToken.hal
new file mode 100644
index 0000000..6507cee
--- /dev/null
+++ b/transport/memory/token/1.0/IMemoryToken.hal
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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 android.hidl.memory.token@1.0;
+
+/**
+ * Interface which composes shared memory
+ */
+interface IMemoryToken {
+    /**
+     * The returned instance of memory must always be a reference to the same memory.
+     * @return mem Memory referenced by this token.
+     */
+    get() generates (memory mem);
+};