forked from suyu/suyu
66 lines
2.7 KiB
C++
66 lines
2.7 KiB
C++
// Copyright 2019 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "common/common_types.h"
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#include "common/uuid.h"
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#include "core/hle/kernel/k_shared_memory.h"
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#include "core/hle/service/time/clock_types.h"
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namespace Service::Time {
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class SharedMemory final {
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public:
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explicit SharedMemory(Core::System& system_);
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~SharedMemory();
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// TODO(ogniK): We have to properly simulate memory barriers, how are we going to do this?
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template <typename T, std::size_t Offset>
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struct MemoryBarrier {
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static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable");
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u32_le read_attempt{};
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std::array<T, 2> data{};
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// These are not actually memory barriers at the moment as we don't have multicore and all
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// HLE is mutexed. This will need to properly be implemented when we start updating the time
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// points on threads. As of right now, we'll be updated both values synchronously and just
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// incrementing the read_attempt to indicate that we waited.
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void StoreData(u8* shared_memory, T data_to_store) {
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std::memcpy(this, shared_memory + Offset, sizeof(*this));
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read_attempt++;
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data[read_attempt & 1] = data_to_store;
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std::memcpy(shared_memory + Offset, this, sizeof(*this));
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}
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// For reading we're just going to read the last stored value. If there was no value stored
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// it will just end up reading an empty value as intended.
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T ReadData(u8* shared_memory) {
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std::memcpy(this, shared_memory + Offset, sizeof(*this));
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return data[(read_attempt - 1) & 1];
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}
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};
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// Shared memory format
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struct Format {
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MemoryBarrier<Clock::SteadyClockContext, 0x0> standard_steady_clock_timepoint;
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MemoryBarrier<Clock::SystemClockContext, 0x38> standard_local_system_clock_context;
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MemoryBarrier<Clock::SystemClockContext, 0x80> standard_network_system_clock_context;
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MemoryBarrier<bool, 0xc8> standard_user_system_clock_automatic_correction;
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u32_le format_version;
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};
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static_assert(sizeof(Format) == 0xd8, "Format is an invalid size");
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void SetupStandardSteadyClock(const Common::UUID& clock_source_id,
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Clock::TimeSpanType current_time_point);
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void UpdateLocalSystemClockContext(const Clock::SystemClockContext& context);
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void UpdateNetworkSystemClockContext(const Clock::SystemClockContext& context);
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void SetAutomaticCorrectionEnabled(bool is_enabled);
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private:
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Core::System& system;
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Format shared_memory_format{};
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};
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} // namespace Service::Time
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