1 /* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #pragma once 17 18 #include <android/hidl/memory/1.0/IMemory.h> 19 #include <hidl/Status.h> 20 #include <inttypes.h> 21 #include <log/log.h> 22 #include <sys/mman.h> 23 24 namespace android { 25 namespace hardware { 26 namespace impl { 27 28 using ::android::sp; 29 using ::android::hardware::hidl_memory; 30 using ::android::hardware::Return; 31 using ::android::hardware::Void; 32 using ::android::hidl::memory::V1_0::IMemory; 33 34 struct AshmemMemory : public IMemory { AshmemMemoryAshmemMemory35 AshmemMemory(const hidl_memory& memory, void* data) : mMemory(memory), mData(data) {} 36 ~AshmemMemoryAshmemMemory37 ~AshmemMemory() { munmap(mData, mMemory.size()); } 38 39 // Methods from ::android::hidl::memory::V1_0::IMemory follow. getPointerAshmemMemory40 Return<void*> getPointer() override { return mData; } getSizeAshmemMemory41 Return<uint64_t> getSize() override { return mMemory.size(); } 42 // NOOPs (since non0remoted memory) updateAshmemMemory43 Return<void> update() override { return Void(); } updateRangeAshmemMemory44 Return<void> updateRange(uint64_t /*start*/, uint64_t /*length*/) override { return Void(); } readAshmemMemory45 Return<void> read() override { return Void(); } readRangeAshmemMemory46 Return<void> readRange(uint64_t /*start*/, uint64_t /*length*/) override { return Void(); } commitAshmemMemory47 Return<void> commit() override { return Void(); } 48 49 private: 50 // Holding onto hidl_memory reference because it contains 51 // handle and size, and handle will also be required for 52 // the remoted case. 53 hidl_memory mMemory; 54 55 // Mapped memory in process. 56 void* mData; 57 }; 58 59 } // namespace impl 60 } // namespace hardware 61 } // namespace android 62