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CoreTiming: Reworked CoreTiming (cherry-picked from Citra #3119)

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* CoreTiming: New CoreTiming; Add Test for CoreTiming
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B3n30 2017-11-25 14:56:57 +01:00 • committed by bunnei
parent c12c756539
commit 82151d407d
12 changed files with 665 additions and 584 deletions
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201
src/core/core_timing.h
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@ -1,144 +1,191 @@
// Copyright (c) 2012- PPSSPP Project / Dolphin Project.
// Licensed under GPLv2 or any later version
// Copyright 2008 Dolphin Emulator Project / 2017 Citra Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#pragma once
/**
* This is a system to schedule events into the emulated machine's future. Time is measured
* in main CPU clock cycles.
*
* To schedule an event, you first have to register its type. This is where you pass in the
* callback. You then schedule events using the type id you get back.
*
* The int cyclesLate that the callbacks get is how many cycles late it was.
* So to schedule a new event on a regular basis:
* inside callback:
* ScheduleEvent(periodInCycles - cyclesLate, callback, "whatever")
*/
#include <functional>
#include <limits>
#include <string>
#include "common/common_types.h"
#include "common/logging/log.h"
// This is a system to schedule events into the emulated machine's future. Time is measured
// in main CPU clock cycles.
// To schedule an event, you first have to register its type. This is where you pass in the
// callback. You then schedule events using the type id you get back.
// See HW/SystemTimers.cpp for the main part of Dolphin's usage of this scheduler.
// The int cycles_late that the callbacks get is how many cycles late it was.
// So to schedule a new event on a regular basis:
// inside callback:
// ScheduleEvent(periodInCycles - cycles_late, callback, "whatever")
constexpr int BASE_CLOCK_RATE = 383778816; // Switch clock speed is 384MHz docked
extern int g_clock_rate_arm11;
// The timing we get from the assembly is 268,111,855.956 Hz
// It is possible that this number isn't just an integer because the compiler could have
// optimized the multiplication by a multiply-by-constant division.
// Rounding to the nearest integer should be fine
constexpr u64 BASE_CLOCK_RATE = 383778816; // Switch clock speed is 384MHz docked
constexpr u64 MAX_VALUE_TO_MULTIPLY = std::numeric_limits<s64>::max() / BASE_CLOCK_RATE;
inline s64 msToCycles(int ms) {
return (s64)g_clock_rate_arm11 / 1000 * ms;
// since ms is int there is no way to overflow
return BASE_CLOCK_RATE * static_cast<s64>(ms) / 1000;
}
inline s64 msToCycles(float ms) {
return (s64)(g_clock_rate_arm11 * ms * (0.001f));
return static_cast<s64>(BASE_CLOCK_RATE * (0.001f) * ms);
}
inline s64 msToCycles(double ms) {
return (s64)(g_clock_rate_arm11 * ms * (0.001));
return static_cast<s64>(BASE_CLOCK_RATE * (0.001) * ms);
}
inline s64 usToCycles(float us) {
return (s64)(g_clock_rate_arm11 * us * (0.000001f));
return static_cast<s64>(BASE_CLOCK_RATE * (0.000001f) * us);
}
inline s64 usToCycles(int us) {
return (g_clock_rate_arm11 / 1000000 * (s64)us);
return (BASE_CLOCK_RATE * static_cast<s64>(us) / 1000000);
}
inline s64 usToCycles(s64 us) {
return (g_clock_rate_arm11 / 1000000 * us);
if (us / 1000000 > MAX_VALUE_TO_MULTIPLY) {
LOG_ERROR(Core_Timing, "Integer overflow, use max value");
return std::numeric_limits<s64>::max();
}
if (us > MAX_VALUE_TO_MULTIPLY) {
LOG_DEBUG(Core_Timing, "Time very big, do rounding");
return BASE_CLOCK_RATE * (us / 1000000);
}
return (BASE_CLOCK_RATE * us) / 1000000;
}
inline s64 usToCycles(u64 us) {
return (s64)(g_clock_rate_arm11 / 1000000 * us);
if (us / 1000000 > MAX_VALUE_TO_MULTIPLY) {
LOG_ERROR(Core_Timing, "Integer overflow, use max value");
return std::numeric_limits<s64>::max();
}
if (us > MAX_VALUE_TO_MULTIPLY) {
LOG_DEBUG(Core_Timing, "Time very big, do rounding");
return BASE_CLOCK_RATE * static_cast<s64>(us / 1000000);
}
return (BASE_CLOCK_RATE * static_cast<s64>(us)) / 1000000;
}
inline s64 nsToCycles(float ns) {
return static_cast<s64>(BASE_CLOCK_RATE * (0.000000001f) * ns);
}
inline s64 nsToCycles(int ns) {
return BASE_CLOCK_RATE * static_cast<s64>(ns) / 1000000000;
}
inline s64 nsToCycles(s64 ns) {
if (ns / 1000000000 > MAX_VALUE_TO_MULTIPLY) {
LOG_ERROR(Core_Timing, "Integer overflow, use max value");
return std::numeric_limits<s64>::max();
}
if (ns > MAX_VALUE_TO_MULTIPLY) {
LOG_DEBUG(Core_Timing, "Time very big, do rounding");
return BASE_CLOCK_RATE * (ns / 1000000000);
}
return (BASE_CLOCK_RATE * ns) / 1000000000;
}
inline s64 nsToCycles(u64 ns) {
if (ns / 1000000000 > MAX_VALUE_TO_MULTIPLY) {
LOG_ERROR(Core_Timing, "Integer overflow, use max value");
return std::numeric_limits<s64>::max();
}
if (ns > MAX_VALUE_TO_MULTIPLY) {
LOG_DEBUG(Core_Timing, "Time very big, do rounding");
return BASE_CLOCK_RATE * (static_cast<s64>(ns) / 1000000000);
}
return (BASE_CLOCK_RATE * static_cast<s64>(ns)) / 1000000000;
}
inline u64 cyclesToNs(s64 cycles) {
return cycles * 1000000000 / BASE_CLOCK_RATE;
}
inline s64 cyclesToUs(s64 cycles) {
return cycles / (g_clock_rate_arm11 / 1000000);
return cycles * 1000000 / BASE_CLOCK_RATE;
}
inline u64 cyclesToMs(s64 cycles) {
return cycles / (g_clock_rate_arm11 / 1000);
return cycles * 1000 / BASE_CLOCK_RATE;
}
namespace CoreTiming {
/**
* CoreTiming begins at the boundary of timing slice -1. An initial call to Advance() is
* required to end slice -1 and start slice 0 before the first cycle of code is executed.
*/
void Init();
void Shutdown();
typedef void (*MHzChangeCallback)();
typedef std::function<void(u64 userdata, int cycles_late)> TimedCallback;
/**
* Advance the CPU core by the specified number of ticks (e.g. to simulate CPU execution time)
* @param ticks Number of ticks to advance the CPU core
*/
void AddTicks(u64 ticks);
* This should only be called from the emu thread, if you are calling it any other thread, you are
* doing something evil
*/
u64 GetTicks();
u64 GetIdleTicks();
u64 GetGlobalTimeUs();
void AddTicks(u64 ticks);
struct EventType;
/**
* Registers an event type with the specified name and callback
* @param name Name of the event type
* @param callback Function that will execute when this event fires
* @returns An identifier for the event type that was registered
* Returns the event_type identifier. if name is not unique, it will assert.
*/
int RegisterEvent(const char* name, TimedCallback callback);
/// For save states.
void RestoreRegisterEvent(int event_type, const char* name, TimedCallback callback);
EventType* RegisterEvent(const std::string& name, TimedCallback callback);
void UnregisterAllEvents();
/// userdata MAY NOT CONTAIN POINTERS. userdata might get written and reloaded from disk,
/// when we implement state saves.
/**
* Schedules an event to run after the specified number of cycles,
* with an optional parameter to be passed to the callback handler.
* This must be run ONLY from within the cpu thread.
* @param cycles_into_future The number of cycles after which this event will be fired
* @param event_type The event type to fire, as returned from RegisterEvent
* @param userdata Optional parameter to pass to the callback when fired
* After the first Advance, the slice lengths and the downcount will be reduced whenever an event
* is scheduled earlier than the current values.
* Scheduling from a callback will not update the downcount until the Advance() completes.
*/
void ScheduleEvent(s64 cycles_into_future, int event_type, u64 userdata = 0);
void ScheduleEvent_Threadsafe(s64 cycles_into_future, int event_type, u64 userdata = 0);
void ScheduleEvent_Threadsafe_Immediate(int event_type, u64 userdata = 0);
void ScheduleEvent(s64 cycles_into_future, const EventType* event_type, u64 userdata = 0);
/**
* Unschedules an event with the specified type and userdata
* @param event_type The type of event to unschedule, as returned from RegisterEvent
* @param userdata The userdata that identifies this event, as passed to ScheduleEvent
* @returns The remaining ticks until the next invocation of the event callback
* This is to be called when outside of hle threads, such as the graphics thread, wants to
* schedule things to be executed on the main thread.
* Not that this doesn't change slice_length and thus events scheduled by this might be called
* with a delay of up to MAX_SLICE_LENGTH
*/
s64 UnscheduleEvent(int event_type, u64 userdata);
void ScheduleEventThreadsafe(s64 cycles_into_future, const EventType* event_type, u64 userdata);
s64 UnscheduleThreadsafeEvent(int event_type, u64 userdata);
void UnscheduleEvent(const EventType* event_type, u64 userdata);
void RemoveEvent(int event_type);
void RemoveThreadsafeEvent(int event_type);
void RemoveAllEvents(int event_type);
bool IsScheduled(int event_type);
/// Runs any pending events and updates downcount for the next slice of cycles
/// We only permit one event of each type in the queue at a time.
void RemoveEvent(const EventType* event_type);
void RemoveNormalAndThreadsafeEvent(const EventType* event_type);
/** Advance must be called at the beginning of dispatcher loops, not the end. Advance() ends
* the previous timing slice and begins the next one, you must Advance from the previous
* slice to the current one before executing any cycles. CoreTiming starts in slice -1 so an
* Advance() is required to initialize the slice length before the first cycle of emulated
* instructions is executed.
*/
void Advance();
void MoveEvents();
void ProcessFifoWaitEvents();
void ForceCheck();
/// Pretend that the main CPU has executed enough cycles to reach the next event.
void Idle(int maxIdle = 0);
void Idle();
/// Clear all pending events. This should ONLY be done on exit or state load.
/// Clear all pending events. This should ONLY be done on exit.
void ClearPendingEvents();
void LogPendingEvents();
void ForceExceptionCheck(s64 cycles);
/// Warning: not included in save states.
void RegisterAdvanceCallback(void (*callback)(int cycles_executed));
void RegisterMHzChangeCallback(MHzChangeCallback callback);
u64 GetGlobalTimeUs();
std::string GetScheduledEventsSummary();
int GetDowncount();
void SetClockFrequencyMHz(int cpu_mhz);
int GetClockFrequencyMHz();
extern int g_slice_length;
} // namespace
} // namespace CoreTiming