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System: Implement CPU overclocking [SAVEVERSION+]

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Partial credit to @CookiePLMonster as well.
This commit is contained in:
Connor McLaughlin
2020-09-29 23:29:28 +10:00
parent 8f9f039665
commit 27697d0508
19 changed files with 249 additions and 36 deletions
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15
src/core/timers.cpp
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@ -41,6 +41,7 @@ void Timers::Reset()
cs.irq_done = false;
}
m_syclk_ticks_carry = 0;
m_sysclk_div_8_carry = 0;
UpdateSysClkEvent();
}
@ -59,6 +60,7 @@ bool Timers::DoState(StateWrapper& sw)
sw.Do(&cs.irq_done);
}
sw.Do(&m_syclk_ticks_carry);
sw.Do(&m_sysclk_div_8_carry);
if (sw.IsReading())
@ -67,6 +69,11 @@ bool Timers::DoState(StateWrapper& sw)
return !sw.HasError();
}
void Timers::CPUClocksChanged()
{
m_syclk_ticks_carry = 0;
}
void Timers::SetGate(u32 timer, bool state)
{
CounterState& cs = m_states[timer];
@ -157,6 +164,8 @@ void Timers::AddTicks(u32 timer, TickCount count)
void Timers::AddSysClkTicks(TickCount sysclk_ticks)
{
sysclk_ticks = System::UnscaleTicksToOverclock(sysclk_ticks, &m_syclk_ticks_carry);
if (!m_states[0].external_counting_enabled && m_states[0].counting_enabled)
AddTicks(0, sysclk_ticks);
if (!m_states[1].external_counting_enabled && m_states[1].counting_enabled)
@ -351,7 +360,9 @@ TickCount Timers::GetTicksUntilNextInterrupt() const
min_ticks_for_this_timer = std::min(min_ticks_for_this_timer, static_cast<TickCount>(0xFFFF - cs.counter));
if (cs.external_counting_enabled) // sysclk/8 for timer 2
min_ticks_for_this_timer = std::max<TickCount>(1, min_ticks_for_this_timer * 8);
min_ticks_for_this_timer = std::max<TickCount>(1, System::ScaleTicksToOverclock(min_ticks_for_this_timer * 8));
else
min_ticks_for_this_timer = std::max<TickCount>(1, System::ScaleTicksToOverclock(min_ticks_for_this_timer));
min_ticks = std::min(min_ticks, min_ticks_for_this_timer);
}
@ -364,7 +375,7 @@ void Timers::UpdateSysClkEvent()
// Still update once every 100ms. If we get polled we'll execute sooner.
const TickCount ticks = GetTicksUntilNextInterrupt();
if (ticks == std::numeric_limits<TickCount>::max())
m_sysclk_event->Schedule(MAX_SLICE_SIZE);
m_sysclk_event->Schedule(System::GetMaxSliceTicks());
else
m_sysclk_event->Schedule(ticks);
}