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300 lines
9.5 KiB
C++
300 lines
9.5 KiB
C++
// Copyright 2008 Dolphin Emulator Project / 2017 Citra Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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/**
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* This is a system to schedule events into the emulated machine's future. Time is measured
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* in main CPU clock cycles.
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*
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* To schedule an event, you first have to register its type. This is where you pass in the
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* callback. You then schedule events using the type id you get back.
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*
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* The int cyclesLate that the callbacks get is how many cycles late it was.
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* So to schedule a new event on a regular basis:
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* inside callback:
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* ScheduleEvent(periodInCycles - cyclesLate, callback, "whatever")
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*/
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#include <chrono>
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#include <functional>
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#include <limits>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include <boost/serialization/split_member.hpp>
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#include <boost/serialization/vector.hpp>
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "common/threadsafe_queue.h"
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#include "core/global.h"
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// The timing we get from the assembly is 268,111,855.956 Hz
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// It is possible that this number isn't just an integer because the compiler could have
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// optimized the multiplication by a multiply-by-constant division.
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// Rounding to the nearest integer should be fine
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constexpr u64 BASE_CLOCK_RATE_ARM11 = 268111856;
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constexpr u64 MAX_VALUE_TO_MULTIPLY = std::numeric_limits<s64>::max() / BASE_CLOCK_RATE_ARM11;
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inline s64 msToCycles(int ms) {
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// since ms is int there is no way to overflow
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return BASE_CLOCK_RATE_ARM11 * static_cast<s64>(ms) / 1000;
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}
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inline s64 msToCycles(float ms) {
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return static_cast<s64>(BASE_CLOCK_RATE_ARM11 * (0.001f) * ms);
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}
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inline s64 msToCycles(double ms) {
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return static_cast<s64>(BASE_CLOCK_RATE_ARM11 * (0.001) * ms);
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}
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inline s64 usToCycles(float us) {
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return static_cast<s64>(BASE_CLOCK_RATE_ARM11 * (0.000001f) * us);
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}
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inline s64 usToCycles(int us) {
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return (BASE_CLOCK_RATE_ARM11 * static_cast<s64>(us) / 1000000);
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}
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inline s64 usToCycles(s64 us) {
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if (us / 1000000 > static_cast<s64>(MAX_VALUE_TO_MULTIPLY)) {
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LOG_ERROR(Core_Timing, "Integer overflow, use max value");
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return std::numeric_limits<s64>::max();
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}
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if (us > static_cast<s64>(MAX_VALUE_TO_MULTIPLY)) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return BASE_CLOCK_RATE_ARM11 * (us / 1000000);
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}
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return (BASE_CLOCK_RATE_ARM11 * us) / 1000000;
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}
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inline s64 usToCycles(u64 us) {
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if (us / 1000000 > MAX_VALUE_TO_MULTIPLY) {
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LOG_ERROR(Core_Timing, "Integer overflow, use max value");
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return std::numeric_limits<s64>::max();
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}
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if (us > MAX_VALUE_TO_MULTIPLY) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return BASE_CLOCK_RATE_ARM11 * static_cast<s64>(us / 1000000);
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}
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return (BASE_CLOCK_RATE_ARM11 * static_cast<s64>(us)) / 1000000;
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}
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inline s64 nsToCycles(float ns) {
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return static_cast<s64>(BASE_CLOCK_RATE_ARM11 * (0.000000001f) * ns);
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}
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inline s64 nsToCycles(int ns) {
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return BASE_CLOCK_RATE_ARM11 * static_cast<s64>(ns) / 1000000000;
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}
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inline s64 nsToCycles(s64 ns) {
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if (ns / 1000000000 > static_cast<s64>(MAX_VALUE_TO_MULTIPLY)) {
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LOG_ERROR(Core_Timing, "Integer overflow, use max value");
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return std::numeric_limits<s64>::max();
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}
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if (ns > static_cast<s64>(MAX_VALUE_TO_MULTIPLY)) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return BASE_CLOCK_RATE_ARM11 * (ns / 1000000000);
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}
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return (BASE_CLOCK_RATE_ARM11 * ns) / 1000000000;
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}
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inline s64 nsToCycles(u64 ns) {
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if (ns / 1000000000 > MAX_VALUE_TO_MULTIPLY) {
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LOG_ERROR(Core_Timing, "Integer overflow, use max value");
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return std::numeric_limits<s64>::max();
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}
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if (ns > MAX_VALUE_TO_MULTIPLY) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return BASE_CLOCK_RATE_ARM11 * (static_cast<s64>(ns) / 1000000000);
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}
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return (BASE_CLOCK_RATE_ARM11 * static_cast<s64>(ns)) / 1000000000;
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}
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inline u64 cyclesToNs(s64 cycles) {
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return cycles * 1000000000 / BASE_CLOCK_RATE_ARM11;
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}
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inline s64 cyclesToUs(s64 cycles) {
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return cycles * 1000000 / BASE_CLOCK_RATE_ARM11;
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}
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inline u64 cyclesToMs(s64 cycles) {
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return cycles * 1000 / BASE_CLOCK_RATE_ARM11;
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}
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namespace Core {
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using TimedCallback = std::function<void(u64 userdata, int cycles_late)>;
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struct TimingEventType {
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TimedCallback callback;
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const std::string* name;
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};
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class Timing {
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public:
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struct Event {
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s64 time;
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u64 fifo_order;
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u64 userdata;
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const TimingEventType* type;
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bool operator>(const Event& right) const;
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bool operator<(const Event& right) const;
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private:
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template <class Archive>
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void save(Archive& ar, const unsigned int) const {
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ar& time;
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ar& fifo_order;
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ar& userdata;
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std::string name = *(type->name);
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ar << name;
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}
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template <class Archive>
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void load(Archive& ar, const unsigned int) {
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ar& time;
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ar& fifo_order;
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ar& userdata;
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std::string name;
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ar >> name;
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type = Global<Timing>().RegisterEvent(name, nullptr);
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}
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friend class boost::serialization::access;
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BOOST_SERIALIZATION_SPLIT_MEMBER()
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};
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static constexpr int MAX_SLICE_LENGTH = 20000;
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class Timer {
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public:
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Timer();
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~Timer();
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s64 GetMaxSliceLength() const;
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void Advance(s64 max_slice_length = MAX_SLICE_LENGTH);
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void Idle();
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u64 GetTicks() const;
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u64 GetIdleTicks() const;
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void AddTicks(u64 ticks);
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s64 GetDowncount() const;
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void ForceExceptionCheck(s64 cycles);
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void MoveEvents();
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private:
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friend class Timing;
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// The queue is a min-heap using std::make_heap/push_heap/pop_heap.
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// We don't use std::priority_queue because we need to be able to serialize, unserialize and
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// erase arbitrary events (RemoveEvent()) regardless of the queue order. These aren't
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// accomodated by the standard adaptor class.
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std::vector<Event> event_queue;
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u64 event_fifo_id = 0;
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// the queue for storing the events from other threads threadsafe until they will be added
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// to the event_queue by the emu thread
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Common::MPSCQueue<Event> ts_queue;
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// Are we in a function that has been called from Advance()
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// If events are sheduled from a function that gets called from Advance(),
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// don't change slice_length and downcount.
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// The time between CoreTiming being intialized and the first call to Advance() is
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// considered the slice boundary between slice -1 and slice 0. Dispatcher loops must call
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// Advance() before executing the first cycle of each slice to prepare the slice length and
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// downcount for that slice.
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bool is_timer_sane = true;
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s64 slice_length = MAX_SLICE_LENGTH;
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s64 downcount = MAX_SLICE_LENGTH;
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s64 executed_ticks = 0;
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u64 idled_cycles = 0;
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// Stores a scaling for the internal clockspeed. Changing this number results in
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// under/overclocking the guest cpu
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double cpu_clock_scale = 1.0;
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template <class Archive>
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void serialize(Archive& ar, const unsigned int) {
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MoveEvents();
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// NOTE: ts_queue should be empty now
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ar& event_queue;
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ar& event_fifo_id;
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ar& slice_length;
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ar& downcount;
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ar& executed_ticks;
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ar& idled_cycles;
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}
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friend class boost::serialization::access;
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};
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explicit Timing(std::size_t num_cores, u32 cpu_clock_percentage);
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~Timing(){};
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/**
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* Returns the event_type identifier. if name is not unique, it will assert.
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*/
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TimingEventType* RegisterEvent(const std::string& name, TimedCallback callback);
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void ScheduleEvent(s64 cycles_into_future, const TimingEventType* event_type, u64 userdata = 0,
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std::size_t core_id = std::numeric_limits<std::size_t>::max());
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void UnscheduleEvent(const TimingEventType* event_type, u64 userdata);
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/// We only permit one event of each type in the queue at a time.
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void RemoveEvent(const TimingEventType* event_type);
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void SetCurrentTimer(std::size_t core_id);
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s64 GetTicks() const;
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s64 GetGlobalTicks() const;
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void AddToGlobalTicks(s64 ticks) {
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global_timer += ticks;
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}
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/**
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* Updates the value of the cpu clock scaling to the new percentage.
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*/
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void UpdateClockSpeed(u32 cpu_clock_percentage);
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std::chrono::microseconds GetGlobalTimeUs() const;
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std::shared_ptr<Timer> GetTimer(std::size_t cpu_id);
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private:
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s64 global_timer = 0;
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// unordered_map stores each element separately as a linked list node so pointers to
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// elements remain stable regardless of rehashes/resizing.
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std::unordered_map<std::string, TimingEventType> event_types = {};
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std::vector<std::shared_ptr<Timer>> timers;
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std::shared_ptr<Timer> current_timer;
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// Stores a scaling for the internal clockspeed. Changing this number results in
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// under/overclocking the guest cpu
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double cpu_clock_scale = 1.0;
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template <class Archive>
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void serialize(Archive& ar, const unsigned int) {
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// event_types set during initialization of other things
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ar& global_timer;
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ar& timers;
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ar& current_timer;
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}
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friend class boost::serialization::access;
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};
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} // namespace Core
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