6 files changed, 34 insertions, 28 deletions

diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index e1c7a0f3b..8dd4a2637 100644
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -145,16 +145,18 @@ struct KernelCore::Impl {
 
     void InitializePreemption(KernelCore& kernel) {
         preemption_event = Core::Timing::CreateEvent(
-            "PreemptionCallback", [this, &kernel](u64 userdata, s64 cycles_late) {
+            "PreemptionCallback", [this, &kernel](u64, std::chrono::nanoseconds) {
                 {
                     SchedulerLock lock(kernel);
                     global_scheduler.PreemptThreads();
                 }
-                s64 time_interval = Core::Timing::msToCycles(std::chrono::milliseconds(10));
+                const auto time_interval = std::chrono::nanoseconds{
+                    Core::Timing::msToCycles(std::chrono::milliseconds(10))};
                 system.CoreTiming().ScheduleEvent(time_interval, preemption_event);
             });
 
-        s64 time_interval = Core::Timing::msToCycles(std::chrono::milliseconds(10));
+        const auto time_interval =
+            std::chrono::nanoseconds{Core::Timing::msToCycles(std::chrono::milliseconds(10))};
         system.CoreTiming().ScheduleEvent(time_interval, preemption_event);
     }
 
diff --git a/src/core/hle/kernel/server_session.cpp b/src/core/hle/kernel/server_session.cpp
index 7b23a6889..af22f4c33 100644
--- a/src/core/hle/kernel/server_session.cpp
+++ b/src/core/hle/kernel/server_session.cpp
@@ -34,7 +34,7 @@ ResultVal<std::shared_ptr<ServerSession>> ServerSession::Create(KernelCore& kern
     std::shared_ptr<ServerSession> session{std::make_shared<ServerSession>(kernel)};
 
     session->request_event = Core::Timing::CreateEvent(
-        name, [session](u64 userdata, s64 cycles_late) { session->CompleteSyncRequest(); });
+        name, [session](u64, std::chrono::nanoseconds) { session->CompleteSyncRequest(); });
     session->name = std::move(name);
     session->parent = std::move(parent);
 
@@ -184,8 +184,8 @@ ResultCode ServerSession::CompleteSyncRequest() {
 
 ResultCode ServerSession::HandleSyncRequest(std::shared_ptr<Thread> thread,
                                             Core::Memory::Memory& memory) {
-    ResultCode result = QueueSyncRequest(std::move(thread), memory);
-    const u64 delay = kernel.IsMulticore() ? 0U : 20000U;
+    const ResultCode result = QueueSyncRequest(std::move(thread), memory);
+    const auto delay = std::chrono::nanoseconds{kernel.IsMulticore() ? 0 : 20000};
     Core::System::GetInstance().CoreTiming().ScheduleEvent(delay, request_event, {});
     return result;
 }
diff --git a/src/core/hle/kernel/time_manager.cpp b/src/core/hle/kernel/time_manager.cpp
index 941305e8e..88b01b751 100644
--- a/src/core/hle/kernel/time_manager.cpp
+++ b/src/core/hle/kernel/time_manager.cpp
@@ -16,7 +16,7 @@ namespace Kernel {
 
 TimeManager::TimeManager(Core::System& system_) : system{system_} {
     time_manager_event_type = Core::Timing::CreateEvent(
-        "Kernel::TimeManagerCallback", [this](u64 thread_handle, [[maybe_unused]] s64 cycles_late) {
+        "Kernel::TimeManagerCallback", [this](u64 thread_handle, std::chrono::nanoseconds) {
             SchedulerLock lock(system.Kernel());
             Handle proper_handle = static_cast<Handle>(thread_handle);
             if (cancelled_events[proper_handle]) {
@@ -34,7 +34,8 @@ void TimeManager::ScheduleTimeEvent(Handle& event_handle, Thread* timetask, s64
         ASSERT(timetask);
         ASSERT(timetask->GetStatus() != ThreadStatus::Ready);
         ASSERT(timetask->GetStatus() != ThreadStatus::WaitMutex);
-        system.CoreTiming().ScheduleEvent(nanoseconds, time_manager_event_type, event_handle);
+        system.CoreTiming().ScheduleEvent(std::chrono::nanoseconds{nanoseconds},
+                                          time_manager_event_type, event_handle);
     } else {
         event_handle = InvalidHandle;
     }
diff --git a/src/core/hle/service/hid/hid.cpp b/src/core/hle/service/hid/hid.cpp
index e9020e0dc..680290cbd 100644
--- a/src/core/hle/service/hid/hid.cpp
+++ b/src/core/hle/service/hid/hid.cpp
@@ -39,9 +39,10 @@ namespace Service::HID {
 
 // Updating period for each HID device.
 // TODO(ogniK): Find actual polling rate of hid
-constexpr s64 pad_update_ticks = static_cast<s64>(1000000000 / 66);
-[[maybe_unused]] constexpr s64 accelerometer_update_ticks = static_cast<s64>(1000000000 / 100);
-[[maybe_unused]] constexpr s64 gyroscope_update_ticks = static_cast<s64>(1000000000 / 100);
+constexpr auto pad_update_ns = std::chrono::nanoseconds{1000000000 / 66};
+[[maybe_unused]] constexpr auto accelerometer_update_ns =
+    std::chrono::nanoseconds{1000000000 / 100};
+[[maybe_unused]] constexpr auto gyroscope_update_ticks = std::chrono::nanoseconds{1000000000 / 100};
 constexpr std::size_t SHARED_MEMORY_SIZE = 0x40000;
 
 IAppletResource::IAppletResource(Core::System& system)
@@ -75,14 +76,14 @@ IAppletResource::IAppletResource(Core::System& system)
     GetController<Controller_Stubbed>(HidController::Unknown3).SetCommonHeaderOffset(0x5000);
 
     // Register update callbacks
-    pad_update_event =
-        Core::Timing::CreateEvent("HID::UpdatePadCallback", [this](u64 userdata, s64 ns_late) {
+    pad_update_event = Core::Timing::CreateEvent(
+        "HID::UpdatePadCallback", [this](u64 userdata, std::chrono::nanoseconds ns_late) {
             UpdateControllers(userdata, ns_late);
         });
 
     // TODO(shinyquagsire23): Other update callbacks? (accel, gyro?)
 
-    system.CoreTiming().ScheduleEvent(pad_update_ticks, pad_update_event);
+    system.CoreTiming().ScheduleEvent(pad_update_ns, pad_update_event);
 
     ReloadInputDevices();
 }
@@ -107,7 +108,7 @@ void IAppletResource::GetSharedMemoryHandle(Kernel::HLERequestContext& ctx) {
     rb.PushCopyObjects(shared_mem);
 }
 
-void IAppletResource::UpdateControllers(u64 userdata, s64 ns_late) {
+void IAppletResource::UpdateControllers(u64 userdata, std::chrono::nanoseconds ns_late) {
     auto& core_timing = system.CoreTiming();
 
     const bool should_reload = Settings::values.is_device_reload_pending.exchange(false);
@@ -118,7 +119,7 @@ void IAppletResource::UpdateControllers(u64 userdata, s64 ns_late) {
         controller->OnUpdate(core_timing, shared_mem->GetPointer(), SHARED_MEMORY_SIZE);
     }
 
-    core_timing.ScheduleEvent(pad_update_ticks - ns_late, pad_update_event);
+    core_timing.ScheduleEvent(pad_update_ns - ns_late, pad_update_event);
 }
 
 class IActiveVibrationDeviceList final : public ServiceFramework<IActiveVibrationDeviceList> {
diff --git a/src/core/hle/service/hid/hid.h b/src/core/hle/service/hid/hid.h
index 6fb048360..c6f0a2584 100644
--- a/src/core/hle/service/hid/hid.h
+++ b/src/core/hle/service/hid/hid.h
@@ -4,10 +4,9 @@
 
 #pragma once
 
-#include "core/hle/service/hid/controllers/controller_base.h"
-#include "core/hle/service/service.h"
+#include <chrono>
 
-#include "controllers/controller_base.h"
+#include "core/hle/service/hid/controllers/controller_base.h"
 #include "core/hle/service/service.h"
 
 namespace Core::Timing {
@@ -65,7 +64,7 @@ private:
     }
 
     void GetSharedMemoryHandle(Kernel::HLERequestContext& ctx);
-    void UpdateControllers(u64 userdata, s64 cycles_late);
+    void UpdateControllers(u64 userdata, std::chrono::nanoseconds ns_late);
 
     std::shared_ptr<Kernel::SharedMemory> shared_mem;
 
diff --git a/src/core/hle/service/nvflinger/nvflinger.cpp b/src/core/hle/service/nvflinger/nvflinger.cpp
index 2f44d3779..789856118 100644
--- a/src/core/hle/service/nvflinger/nvflinger.cpp
+++ b/src/core/hle/service/nvflinger/nvflinger.cpp
@@ -28,8 +28,7 @@
 
 namespace Service::NVFlinger {
 
-constexpr s64 frame_ticks = static_cast<s64>(1000000000 / 60);
-constexpr s64 frame_ticks_30fps = static_cast<s64>(1000000000 / 30);
+constexpr auto frame_ns = std::chrono::nanoseconds{1000000000 / 60};
 
 void NVFlinger::VSyncThread(NVFlinger& nv_flinger) {
     nv_flinger.SplitVSync();
@@ -67,20 +66,24 @@ NVFlinger::NVFlinger(Core::System& system) : system(system) {
     guard = std::make_shared<std::mutex>();
 
     // Schedule the screen composition events
-    composition_event =
-        Core::Timing::CreateEvent("ScreenComposition", [this](u64 userdata, s64 ns_late) {
+    composition_event = Core::Timing::CreateEvent(
+        "ScreenComposition", [this](u64, std::chrono::nanoseconds ns_late) {
             Lock();
             Compose();
-            const auto ticks = GetNextTicks();
-            this->system.CoreTiming().ScheduleEvent(std::max<s64>(0LL, ticks - ns_late),
-                                                    composition_event);
+
+            const auto ticks = std::chrono::nanoseconds{GetNextTicks()};
+            const auto ticks_delta = ticks - ns_late;
+            const auto future_ns = std::max(std::chrono::nanoseconds::zero(), ticks_delta);
+
+            this->system.CoreTiming().ScheduleEvent(future_ns, composition_event);
         });
+
     if (system.IsMulticore()) {
         is_running = true;
         wait_event = std::make_unique<Common::Event>();
         vsync_thread = std::make_unique<std::thread>(VSyncThread, std::ref(*this));
     } else {
-        system.CoreTiming().ScheduleEvent(frame_ticks, composition_event);
+        system.CoreTiming().ScheduleEvent(frame_ns, composition_event);
     }
 }