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Diffstat (limited to 'src/core/hle/service/time/time_sharedmemory.h')
-rw-r--r-- | src/core/hle/service/time/time_sharedmemory.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/core/hle/service/time/time_sharedmemory.h b/src/core/hle/service/time/time_sharedmemory.h new file mode 100644 index 000000000..cb8253541 --- /dev/null +++ b/src/core/hle/service/time/time_sharedmemory.h @@ -0,0 +1,74 @@ +// Copyright 2019 yuzu emulator team +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#pragma once + +#include "common/common_types.h" +#include "core/hle/kernel/shared_memory.h" +#include "core/hle/service/time/time.h" + +namespace Service::Time { +class SharedMemory { +public: + explicit SharedMemory(Core::System& system); + ~SharedMemory(); + + // Return the shared memory handle + Kernel::SharedPtr<Kernel::SharedMemory> GetSharedMemoryHolder() const; + + // Set memory barriers in shared memory and update them + void SetStandardSteadyClockTimepoint(const SteadyClockTimePoint& timepoint); + void SetStandardLocalSystemClockContext(const SystemClockContext& context); + void SetStandardNetworkSystemClockContext(const SystemClockContext& context); + void SetStandardUserSystemClockAutomaticCorrectionEnabled(bool enabled); + + // Pull from memory barriers in the shared memory + SteadyClockTimePoint GetStandardSteadyClockTimepoint(); + SystemClockContext GetStandardLocalSystemClockContext(); + SystemClockContext GetStandardNetworkSystemClockContext(); + bool GetStandardUserSystemClockAutomaticCorrectionEnabled(); + + // TODO(ogniK): We have to properly simulate memory barriers, how are we going to do this? + template <typename T, std::size_t Offset> + struct MemoryBarrier { + static_assert(std::is_trivially_constructible_v<T>, "T must be trivially constructable"); + u32_le read_attempt{}; + std::array<T, 2> data{}; + + // These are not actually memory barriers at the moment as we don't have multicore and all + // HLE is mutexed. This will need to properly be implemented when we start updating the time + // points on threads. As of right now, we'll be updated both values synchronously and just + // incrementing the read_attempt to indicate that we waited. + void StoreData(u8* shared_memory, T data_to_store) { + std::memcpy(this, shared_memory + Offset, sizeof(*this)); + read_attempt++; + data[read_attempt & 1] = data_to_store; + std::memcpy(shared_memory + Offset, this, sizeof(*this)); + } + + // For reading we're just going to read the last stored value. If there was no value stored + // it will just end up reading an empty value as intended. + T ReadData(u8* shared_memory) { + std::memcpy(this, shared_memory + Offset, sizeof(*this)); + return data[(read_attempt - 1) & 1]; + } + }; + + // Shared memory format + struct Format { + MemoryBarrier<SteadyClockTimePoint, 0x0> standard_steady_clock_timepoint; + MemoryBarrier<SystemClockContext, 0x38> standard_local_system_clock_context; + MemoryBarrier<SystemClockContext, 0x80> standard_network_system_clock_context; + MemoryBarrier<bool, 0xc8> standard_user_system_clock_automatic_correction; + u32_le format_version; + }; + static_assert(sizeof(Format) == 0xd8, "Format is an invalid size"); + +private: + Kernel::SharedPtr<Kernel::SharedMemory> shared_memory_holder{}; + Core::System& system; + Format shared_memory_format{}; +}; + +} // namespace Service::Time |