78002be334
* DSP: Own DSP RAM and add it to fastmem * Vendor Teakra * Add MacOS support to fastmem * Fix MacOS fastmem paths * Fix iOS build
114 lines
2.4 KiB
C++
114 lines
2.4 KiB
C++
#include "crash.h"
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#include "timer.h"
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namespace Teakra {
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void Timer::Reset() {
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update_mmio = 0;
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pause = 0;
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count_mode = CountMode::Single;
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scale = 0;
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start_high = 0;
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start_low = 0;
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counter = 0;
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counter_high = 0;
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counter_low = 0;
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}
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void Timer::Restart() {
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ASSERT(static_cast<u16>(count_mode) < 4);
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if (count_mode != CountMode::FreeRunning) {
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counter = ((u32)start_high << 16) | start_low;
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UpdateMMIO();
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}
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}
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void Timer::Tick() {
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ASSERT(static_cast<u16>(count_mode) < 4);
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ASSERT(scale == 0);
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if (pause)
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return;
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if (count_mode == CountMode::EventCount)
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return;
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if (counter == 0) {
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if (count_mode == CountMode::AutoRestart) {
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Restart();
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} else if (count_mode == CountMode::FreeRunning) {
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counter = 0xFFFFFFFF;
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UpdateMMIO();
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}
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} else {
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--counter;
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UpdateMMIO();
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if (counter == 0)
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interrupt_handler();
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}
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}
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void Timer::TickEvent() {
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if (pause)
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return;
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if (count_mode != CountMode::EventCount)
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return;
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if (counter == 0)
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return;
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--counter;
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UpdateMMIO();
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if (counter == 0)
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interrupt_handler();
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}
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void Timer::UpdateMMIO() {
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if (!update_mmio)
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return;
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counter_high = counter >> 16;
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counter_low = counter & 0xFFFF;
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}
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u64 Timer::GetMaxSkip() const {
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if (pause || count_mode == CountMode::EventCount)
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return Infinity;
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if (counter == 0) {
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if (count_mode == CountMode::AutoRestart) {
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return ((u32)start_high << 16) | start_low;
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} else if (count_mode == CountMode::FreeRunning) {
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return 0xFFFFFFFF;
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} else /*Single*/ {
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return Infinity;
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}
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}
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return counter - 1;
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}
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void Timer::Skip(u64 ticks) {
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if (pause || count_mode == CountMode::EventCount)
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return;
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if (counter == 0) {
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u32 reset;
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if (count_mode == CountMode::AutoRestart) {
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reset = ((u32)start_high << 16) | start_low;
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} else if (count_mode == CountMode::FreeRunning) {
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reset = 0xFFFFFFFF;
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} else {
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return;
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}
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ASSERT(reset >= ticks);
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counter = reset - ((u32)ticks - 1);
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} else {
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ASSERT(counter > ticks);
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counter -= (u32)ticks;
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}
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UpdateMMIO();
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}
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Timer::Timer(CoreTiming& core_timing) {
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core_timing.RegisterCallbacks(this);
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}
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} // namespace Teakra
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