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// Copyright 2018 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:
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(const bool enabled);
// Pull from memory barriers in the shared memory
SteadyClockTimePoint GetStandardSteadyClockTimepoint() const;
SystemClockContext GetStandardLocalSystemClockContext() const;
SystemClockContext GetStandardNetworkSystemClockContext() const;
bool GetStandardUserSystemClockAutomaticCorrectionEnabled() const;
// TODO(ogniK): We have to properly simulate memory barriers, how are we going to do this?
template <typename T>
struct MemoryBarrier {
u32_le read_attempt{};
T data[2]{};
// 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(T data_to_store) {
read_attempt++;
data[read_attempt & 1] = data_to_store;
}
// 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() const {
return data[(read_attempt - 1) & 1];
}
};
// Shared memory format
struct Format {
MemoryBarrier<SteadyClockTimePoint> standard_steady_clock_timepoint;
MemoryBarrier<SystemClockContext> standard_local_system_clock_context;
MemoryBarrier<SystemClockContext> standard_network_system_clock_context;
MemoryBarrier<u8> standard_user_system_clock_automatic_correction;
u32_le format_version;
};
static_assert(sizeof(Format) == 0xd8, "Format is an invalid size");
private:
const std::size_t SHARED_MEMORY_SIZE = 0x1000;
Kernel::SharedPtr<Kernel::SharedMemory> shared_memory_holder{};
Core::System& system;
Format* shared_memory_format;
};
} // namespace Service::Time
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