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// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include "common/common_types.h"
#include "common/uuid.h"
#include "core/hle/kernel/k_shared_memory.h"
#include "core/hle/service/time/clock_types.h"
namespace Service::Time {
class SharedMemory final {
public:
explicit SharedMemory(Core::System& system_);
~SharedMemory();
// 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_copyable_v<T>, "T must be trivially copyable");
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<Clock::SteadyClockContext, 0x0> standard_steady_clock_timepoint;
MemoryBarrier<Clock::SystemClockContext, 0x38> standard_local_system_clock_context;
MemoryBarrier<Clock::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");
void SetupStandardSteadyClock(const Common::UUID& clock_source_id,
Clock::TimeSpanType current_time_point);
void UpdateLocalSystemClockContext(const Clock::SystemClockContext& context);
void UpdateNetworkSystemClockContext(const Clock::SystemClockContext& context);
void SetAutomaticCorrectionEnabled(bool is_enabled);
private:
Core::System& system;
Format shared_memory_format{};
};
} // namespace Service::Time
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