Vendor Teakra, make emulator own DSP RAM and add DSP RAM to fastmem (#806)

* DSP: Own DSP RAM and add it to fastmem

* Vendor Teakra

* Add MacOS support to fastmem

* Fix MacOS fastmem paths

* Fix iOS build

third_party/teakra/src/timer.cpp

@@ -0,0 +1,113 @@
+#include "crash.h"
+#include "timer.h"
+
+namespace Teakra {
+
+void Timer::Reset() {
+    update_mmio = 0;
+    pause = 0;
+    count_mode = CountMode::Single;
+    scale = 0;
+
+    start_high = 0;
+    start_low = 0;
+    counter = 0;
+    counter_high = 0;
+    counter_low = 0;
+}
+
+void Timer::Restart() {
+    ASSERT(static_cast<u16>(count_mode) < 4);
+    if (count_mode != CountMode::FreeRunning) {
+        counter = ((u32)start_high << 16) | start_low;
+        UpdateMMIO();
+    }
+}
+
+void Timer::Tick() {
+    ASSERT(static_cast<u16>(count_mode) < 4);
+    ASSERT(scale == 0);
+    if (pause)
+        return;
+    if (count_mode == CountMode::EventCount)
+        return;
+    if (counter == 0) {
+        if (count_mode == CountMode::AutoRestart) {
+            Restart();
+        } else if (count_mode == CountMode::FreeRunning) {
+            counter = 0xFFFFFFFF;
+            UpdateMMIO();
+        }
+    } else {
+        --counter;
+        UpdateMMIO();
+        if (counter == 0)
+            interrupt_handler();
+    }
+}
+
+void Timer::TickEvent() {
+    if (pause)
+        return;
+    if (count_mode != CountMode::EventCount)
+        return;
+    if (counter == 0)
+        return;
+    --counter;
+    UpdateMMIO();
+    if (counter == 0)
+        interrupt_handler();
+}
+
+void Timer::UpdateMMIO() {
+    if (!update_mmio)
+        return;
+    counter_high = counter >> 16;
+    counter_low = counter & 0xFFFF;
+}
+
+u64 Timer::GetMaxSkip() const {
+    if (pause || count_mode == CountMode::EventCount)
+        return Infinity;
+
+    if (counter == 0) {
+        if (count_mode == CountMode::AutoRestart) {
+            return ((u32)start_high << 16) | start_low;
+        } else if (count_mode == CountMode::FreeRunning) {
+            return 0xFFFFFFFF;
+        } else /*Single*/ {
+            return Infinity;
+        }
+    }
+
+    return counter - 1;
+}
+
+void Timer::Skip(u64 ticks) {
+    if (pause || count_mode == CountMode::EventCount)
+        return;
+
+    if (counter == 0) {
+        u32 reset;
+        if (count_mode == CountMode::AutoRestart) {
+            reset = ((u32)start_high << 16) | start_low;
+        } else if (count_mode == CountMode::FreeRunning) {
+            reset = 0xFFFFFFFF;
+        } else {
+            return;
+        }
+        ASSERT(reset >= ticks);
+        counter = reset - ((u32)ticks - 1);
+    } else {
+        ASSERT(counter > ticks);
+        counter -= (u32)ticks;
+    }
+
+    UpdateMMIO();
+}
+
+Timer::Timer(CoreTiming& core_timing) {
+    core_timing.RegisterCallbacks(this);
+}
+
+} // namespace Teakra