81 lines
2.5 KiB
C++
Executable file
81 lines
2.5 KiB
C++
Executable file
/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* SPDX-License-Identifier: 0BSD
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*/
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#pragma once
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#include <atomic>
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#include <array>
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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#include <vector>
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namespace Dynarmic {
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using VAddr = std::uint64_t;
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using Vector = std::array<std::uint64_t, 2>;
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class ExclusiveMonitor {
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public:
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/// @param processor_count Maximum number of processors using this global
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/// exclusive monitor. Each processor must have a
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/// unique id.
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explicit ExclusiveMonitor(size_t processor_count);
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size_t GetProcessorCount() const;
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/// Marks a region containing [address, address+size) to be exclusive to
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/// processor processor_id.
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template <typename T, typename Function>
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T ReadAndMark(size_t processor_id, VAddr address, Function op) {
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static_assert(std::is_trivially_copyable_v<T>);
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const VAddr masked_address = address & RESERVATION_GRANULE_MASK;
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Lock();
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exclusive_addresses[processor_id] = masked_address;
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const T value = op();
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std::memcpy(exclusive_values[processor_id].data(), &value, sizeof(T));
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Unlock();
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return value;
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}
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/// Checks to see if processor processor_id has exclusive access to the
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/// specified region. If it does, executes the operation then clears
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/// the exclusive state for processors if their exclusive region(s)
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/// contain [address, address+size).
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template <typename T, typename Function>
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bool DoExclusiveOperation(size_t processor_id, VAddr address, Function op) {
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static_assert(std::is_trivially_copyable_v<T>);
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if (!CheckAndClear(processor_id, address)) {
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return false;
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}
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T saved_value;
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std::memcpy(&saved_value, exclusive_values[processor_id].data(), sizeof(T));
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const bool result = op(saved_value);
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Unlock();
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return result;
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}
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/// Unmark everything.
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void Clear();
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/// Unmark processor id
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void ClearProcessor(size_t processor_id);
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private:
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bool CheckAndClear(size_t processor_id, VAddr address);
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void Lock();
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void Unlock();
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static constexpr VAddr RESERVATION_GRANULE_MASK = 0xFFFF'FFFF'FFFF'FFFFull;
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static constexpr VAddr INVALID_EXCLUSIVE_ADDRESS = 0xDEAD'DEAD'DEAD'DEADull;
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std::atomic_flag is_locked;
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std::vector<VAddr> exclusive_addresses;
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std::vector<Vector> exclusive_values;
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};
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} // namespace Dynarmic
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