mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2024-11-27 08:05:41 +00:00
426 lines
12 KiB
C++
426 lines
12 KiB
C++
#include "timers.h"
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#include "common/log.h"
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#include "common/state_wrapper.h"
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#include "gpu.h"
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#include "interrupt_controller.h"
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#include "system.h"
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#include <imgui.h>
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Log_SetChannel(Timers);
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Timers::Timers() = default;
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Timers::~Timers() = default;
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void Timers::Initialize(System* system, InterruptController* interrupt_controller, GPU* gpu)
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{
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m_system = system;
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m_interrupt_controller = interrupt_controller;
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m_gpu = gpu;
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m_sysclk_event = system->CreateTimingEvent("Timer SysClk Interrupt", 1, 1,
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std::bind(&Timers::AddSysClkTicks, this, std::placeholders::_1), false);
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}
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void Timers::Reset()
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{
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for (CounterState& cs : m_states)
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{
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cs.mode.bits = 0;
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cs.mode.interrupt_request_n = true;
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cs.counter = 0;
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cs.target = 0;
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cs.gate = false;
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cs.external_counting_enabled = false;
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cs.counting_enabled = true;
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cs.irq_done = false;
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}
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m_sysclk_div_8_carry = 0;
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UpdateSysClkEvent();
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}
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bool Timers::DoState(StateWrapper& sw)
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{
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for (CounterState& cs : m_states)
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{
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sw.Do(&cs.mode.bits);
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sw.Do(&cs.counter);
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sw.Do(&cs.target);
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sw.Do(&cs.gate);
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sw.Do(&cs.use_external_clock);
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sw.Do(&cs.external_counting_enabled);
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sw.Do(&cs.counting_enabled);
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sw.Do(&cs.irq_done);
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}
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sw.Do(&m_sysclk_div_8_carry);
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if (sw.IsReading())
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UpdateSysClkEvent();
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return !sw.HasError();
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}
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void Timers::SetGate(u32 timer, bool state)
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{
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CounterState& cs = m_states[timer];
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if (cs.gate == state)
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return;
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cs.gate = state;
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if (cs.mode.sync_enable)
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{
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if (state)
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{
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switch (cs.mode.sync_mode)
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{
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case SyncMode::ResetOnGate:
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case SyncMode::ResetAndRunOnGate:
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cs.counter = 0;
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break;
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case SyncMode::FreeRunOnGate:
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cs.mode.sync_enable = false;
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break;
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}
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}
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UpdateCountingEnabled(cs);
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}
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}
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TickCount Timers::GetTicksUntilIRQ(u32 timer) const
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{
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const CounterState& cs = m_states[timer];
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if (!cs.counting_enabled)
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return std::numeric_limits<TickCount>::max();
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TickCount ticks_until_irq = std::numeric_limits<TickCount>::max();
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if (cs.mode.irq_at_target && cs.counter < cs.target)
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ticks_until_irq = static_cast<TickCount>(cs.target - cs.counter);
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if (cs.mode.irq_on_overflow)
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ticks_until_irq = std::min(ticks_until_irq, static_cast<TickCount>(0xFFFFu - cs.counter));
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return ticks_until_irq;
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}
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void Timers::AddTicks(u32 timer, TickCount count)
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{
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CounterState& cs = m_states[timer];
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const u32 old_counter = cs.counter;
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cs.counter += static_cast<u32>(count);
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bool interrupt_request = false;
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if (cs.counter >= cs.target && old_counter < cs.target)
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{
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interrupt_request |= cs.mode.irq_at_target;
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cs.mode.reached_target = true;
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if (cs.mode.reset_at_target)
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{
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if (cs.target > 0)
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cs.counter %= cs.target;
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else
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cs.counter = 0;
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}
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}
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if (cs.counter >= 0xFFFF)
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{
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interrupt_request |= cs.mode.irq_on_overflow;
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cs.mode.reached_overflow = true;
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cs.counter %= 0xFFFFu;
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}
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if (interrupt_request)
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{
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if (!cs.mode.irq_pulse_n)
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{
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// this is actually low for a few cycles
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cs.mode.interrupt_request_n = false;
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UpdateIRQ(timer);
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cs.mode.interrupt_request_n = true;
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}
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else
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{
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cs.mode.interrupt_request_n ^= true;
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UpdateIRQ(timer);
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}
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}
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}
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void Timers::AddSysClkTicks(TickCount sysclk_ticks)
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{
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if (!m_states[0].external_counting_enabled && m_states[0].counting_enabled)
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AddTicks(0, sysclk_ticks);
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if (!m_states[1].external_counting_enabled && m_states[1].counting_enabled)
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AddTicks(1, sysclk_ticks);
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if (m_states[2].external_counting_enabled)
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{
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TickCount sysclk_div_8_ticks = (sysclk_ticks + m_sysclk_div_8_carry) / 8;
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m_sysclk_div_8_carry = (sysclk_ticks + m_sysclk_div_8_carry) % 8;
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AddTicks(2, sysclk_div_8_ticks);
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}
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else if (m_states[2].counting_enabled)
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{
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AddTicks(2, sysclk_ticks);
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}
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UpdateSysClkEvent();
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}
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u32 Timers::ReadRegister(u32 offset)
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{
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const u32 timer_index = (offset >> 4) & u32(0x03);
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const u32 port_offset = offset & u32(0x0F);
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CounterState& cs = m_states[timer_index];
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switch (port_offset)
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{
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case 0x00:
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{
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if (timer_index < 2 && cs.external_counting_enabled)
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{
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// timers 0/1 depend on the GPU
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if (timer_index == 0 || m_gpu->IsCRTCScanlinePending())
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m_gpu->SynchronizeCRTC();
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}
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m_sysclk_event->InvokeEarly();
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return cs.counter;
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}
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case 0x04:
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{
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if (timer_index < 2 && cs.external_counting_enabled)
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{
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// timers 0/1 depend on the GPU
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if (timer_index == 0 || m_gpu->IsCRTCScanlinePending())
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m_gpu->SynchronizeCRTC();
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}
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m_sysclk_event->InvokeEarly();
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const u32 bits = cs.mode.bits;
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cs.mode.reached_overflow = false;
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cs.mode.reached_target = false;
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return bits;
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}
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case 0x08:
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return cs.target;
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default:
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Log_ErrorPrintf("Read unknown register in timer %u (offset 0x%02X)", offset);
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return UINT32_C(0xFFFFFFFF);
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}
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}
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void Timers::WriteRegister(u32 offset, u32 value)
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{
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const u32 timer_index = (offset >> 4) & u32(0x03);
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const u32 port_offset = offset & u32(0x0F);
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CounterState& cs = m_states[timer_index];
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if (timer_index < 2 && cs.external_counting_enabled)
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{
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// timers 0/1 depend on the GPU
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if (timer_index == 0 || m_gpu->IsCRTCScanlinePending())
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m_gpu->SynchronizeCRTC();
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}
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m_sysclk_event->InvokeEarly();
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switch (port_offset)
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{
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case 0x00:
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{
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Log_DebugPrintf("Timer %u write counter %u", timer_index, value);
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cs.counter = value & u32(0xFFFF);
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if (timer_index == 2 || !cs.external_counting_enabled)
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UpdateSysClkEvent();
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}
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break;
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case 0x04:
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{
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static constexpr u32 WRITE_MASK = 0b1110001111111111;
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Log_DebugPrintf("Timer %u write mode register 0x%04X", timer_index, value);
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cs.mode.bits = (value & WRITE_MASK) | (cs.mode.bits & ~WRITE_MASK);
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cs.use_external_clock = (cs.mode.clock_source & (timer_index == 2 ? 2 : 1)) != 0;
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cs.counter = 0;
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cs.irq_done = false;
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UpdateCountingEnabled(cs);
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UpdateIRQ(timer_index);
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UpdateSysClkEvent();
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}
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break;
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case 0x08:
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{
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Log_DebugPrintf("Timer %u write target 0x%04X", timer_index, ZeroExtend32(Truncate16(value)));
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cs.target = value & u32(0xFFFF);
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if (timer_index == 2 || !cs.external_counting_enabled)
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UpdateSysClkEvent();
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}
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break;
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default:
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Log_ErrorPrintf("Write unknown register in timer %u (offset 0x%02X, value 0x%X)", offset, value);
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break;
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}
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}
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void Timers::UpdateCountingEnabled(CounterState& cs)
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{
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if (cs.mode.sync_enable)
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{
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switch (cs.mode.sync_mode)
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{
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case SyncMode::PauseOnGate:
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cs.counting_enabled = !cs.gate;
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break;
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case SyncMode::ResetOnGate:
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cs.counting_enabled = true;
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break;
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case SyncMode::ResetAndRunOnGate:
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case SyncMode::FreeRunOnGate:
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cs.counting_enabled = cs.gate;
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break;
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}
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}
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else
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{
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cs.counting_enabled = true;
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}
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cs.external_counting_enabled = cs.use_external_clock && cs.counting_enabled;
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}
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void Timers::UpdateIRQ(u32 index)
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{
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CounterState& cs = m_states[index];
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if (cs.mode.interrupt_request_n || (!cs.mode.irq_repeat && cs.irq_done))
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return;
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Log_DebugPrintf("Raising timer %u IRQ", index);
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cs.irq_done = true;
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m_interrupt_controller->InterruptRequest(
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static_cast<InterruptController::IRQ>(static_cast<u32>(InterruptController::IRQ::TMR0) + index));
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}
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TickCount Timers::GetTicksUntilNextInterrupt() const
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{
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TickCount min_ticks = std::numeric_limits<TickCount>::max();
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for (u32 i = 0; i < NUM_TIMERS; i++)
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{
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const CounterState& cs = m_states[i];
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if (!cs.counting_enabled || (i < 2 && cs.external_counting_enabled) ||
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(!cs.mode.irq_at_target && !cs.mode.irq_on_overflow))
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{
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continue;
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}
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TickCount min_ticks_for_this_timer = std::numeric_limits<TickCount>::max();
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if (cs.mode.irq_at_target && cs.counter < cs.target)
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min_ticks_for_this_timer = static_cast<TickCount>(cs.target - cs.counter);
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if (cs.mode.irq_on_overflow && cs.counter < cs.target)
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min_ticks_for_this_timer = std::min(min_ticks_for_this_timer, static_cast<TickCount>(0xFFFF - cs.counter));
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if (cs.external_counting_enabled) // sysclk/8 for timer 2
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min_ticks_for_this_timer = std::max<TickCount>(1, min_ticks_for_this_timer / 8);
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min_ticks = std::min(min_ticks, min_ticks_for_this_timer);
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}
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return min_ticks;
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}
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void Timers::UpdateSysClkEvent()
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{
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// Still update once every 100ms. If we get polled we'll execute sooner.
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const TickCount ticks = GetTicksUntilNextInterrupt();
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if (ticks == std::numeric_limits<TickCount>::max())
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m_sysclk_event->Schedule(MAX_SLICE_SIZE);
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else
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m_sysclk_event->Schedule(ticks);
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}
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void Timers::DrawDebugStateWindow()
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{
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static constexpr u32 NUM_COLUMNS = 10;
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static constexpr std::array<const char*, NUM_COLUMNS> column_names = {
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{"#", "Value", "Target", "Sync", "Reset", "IRQ", "IRQRepeat", "IRQToggle", "Clock Source", "Reached"}};
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static constexpr std::array<const char*, 4> sync_mode_names = {
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{"PauseOnGate", "ResetOnGate", "ResetAndRunOnGate", "FreeRunOnGate"}};
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static constexpr std::array<std::array<const char*, 4>, 3> clock_source_names = {
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{{{"SysClk", "DotClk", "SysClk", "DotClk"}},
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{{"SysClk", "HBlank", "SysClk", "HBlank"}},
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{{"SysClk", "DotClk", "SysClk/8", "SysClk/8"}}}};
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const float framebuffer_scale = ImGui::GetIO().DisplayFramebufferScale.x;
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ImGui::SetNextWindowSize(ImVec2(800.0f * framebuffer_scale, 100.0f * framebuffer_scale), ImGuiCond_FirstUseEver);
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if (!ImGui::Begin("Timer State", &m_system->GetSettings().debugging.show_timers_state))
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{
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ImGui::End();
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return;
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}
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ImGui::Columns(NUM_COLUMNS);
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ImGui::SetColumnWidth(0, 20.0f * framebuffer_scale);
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ImGui::SetColumnWidth(1, 50.0f * framebuffer_scale);
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ImGui::SetColumnWidth(2, 50.0f * framebuffer_scale);
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ImGui::SetColumnWidth(3, 100.0f * framebuffer_scale);
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ImGui::SetColumnWidth(4, 80.0f * framebuffer_scale);
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ImGui::SetColumnWidth(5, 80.0f * framebuffer_scale);
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ImGui::SetColumnWidth(6, 80.0f * framebuffer_scale);
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ImGui::SetColumnWidth(7, 80.0f * framebuffer_scale);
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ImGui::SetColumnWidth(8, 80.0f * framebuffer_scale);
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ImGui::SetColumnWidth(9, 80.0f * framebuffer_scale);
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for (const char* title : column_names)
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{
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ImGui::TextUnformatted(title);
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ImGui::NextColumn();
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}
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for (u32 i = 0; i < NUM_TIMERS; i++)
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{
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const CounterState& cs = m_states[i];
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ImGui::PushStyleColor(ImGuiCol_Text,
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cs.counting_enabled ? ImVec4(1.0f, 1.0f, 1.0f, 1.0f) : ImVec4(0.5f, 0.5f, 0.5f, 1.0f));
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ImGui::Text("%u", i);
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ImGui::NextColumn();
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ImGui::Text("%u", cs.counter);
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ImGui::NextColumn();
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ImGui::Text("%u", cs.target);
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ImGui::NextColumn();
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ImGui::Text("%s",
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cs.mode.sync_enable ? sync_mode_names[static_cast<u8>(cs.mode.sync_mode.GetValue())] : "Disabled");
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ImGui::NextColumn();
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ImGui::Text("%s", cs.mode.reset_at_target ? "@Target" : "@Overflow");
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ImGui::NextColumn();
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ImGui::Text("%s%s", cs.mode.irq_at_target ? "Target " : "", cs.mode.irq_on_overflow ? "Overflow" : "");
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ImGui::NextColumn();
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ImGui::Text("%s", cs.mode.irq_repeat ? "Yes" : "No");
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ImGui::NextColumn();
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ImGui::Text("%s", cs.mode.irq_pulse_n ? "Yes" : "No");
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ImGui::NextColumn();
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ImGui::Text("%s%s", clock_source_names[i][cs.mode.clock_source], cs.external_counting_enabled ? " (External)" : "");
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ImGui::NextColumn();
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ImGui::Text("%s%s", cs.mode.reached_target ? "Target " : "", cs.mode.reached_overflow ? "Overflow" : "");
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ImGui::NextColumn();
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ImGui::PopStyleColor();
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}
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ImGui::Columns(1);
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ImGui::End();
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}
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