| #pragma once |
| /* |
| * Copyright (C) 2017 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. |
| */ |
| |
| // Base macros for all layout structures. |
| |
| #include <type_traits> |
| #include "common/vsoc/shm/version.h" |
| |
| #define ASSERT_SHM_COMPATIBLE(T, R) \ |
| static_assert(sizeof(T) == vsoc::layout::version_info::R::T##_size, \ |
| "size changed, update the version"); \ |
| static_assert(std::is_trivial<T>(), "Class uses features that are unsafe") |
| |
| #define ASSERT_SHM_CONSTANT_VALUE(T, R) \ |
| static_assert(T == vsoc::layout::version_info::R::constant_values::T, \ |
| "Constant value changed") |
| |
| namespace vsoc { |
| namespace layout { |
| |
| /** |
| * Base class that should be used for all shared memory objects |
| */ |
| class Base { |
| }; |
| ASSERT_SHM_COMPATIBLE(Base, multi_region); |
| |
| /** |
| * Memory is shared between Guest and Host kernels. In some cases we need |
| * flag to indicate which side we're on. In those cases we'll use this |
| * simple structure. |
| * |
| * These are carefully formatted to make Guest and Host a bitfield. |
| */ |
| struct Sides : public Base { |
| static const uint32_t NoSides = 0; |
| static const uint32_t Guest = 1; |
| static const uint32_t Host = 2; |
| static const uint32_t Both = 3; |
| #ifdef ANDROID |
| static const uint32_t OurSide = Guest; |
| static const uint32_t Peer = Host; |
| #else |
| static const uint32_t OurSide = Host; |
| static const uint32_t Peer = Guest; |
| #endif |
| |
| uint32_t value_; |
| }; |
| ASSERT_SHM_COMPATIBLE(Sides, multi_region); |
| |
| /** |
| * Base class for all region layout structures. |
| */ |
| class RegionLayout : public Base { |
| }; |
| ASSERT_SHM_COMPATIBLE(RegionLayout, multi_region); |
| |
| } // namespace layout |
| } // namespace vsoc |