1 files changed, 111 insertions, 0 deletions
diff --git a/src/core/hle/kernel/svc/svc_event.cpp b/src/core/hle/kernel/svc/svc_event.cpp
new file mode 100644
index 000000000..885f02f50
--- /dev/null
+++ b/src/core/hle/kernel/svc/svc_event.cpp
@@ -0,0 +1,111 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/scope_exit.h"
+#include "core/core.h"
+#include "core/hle/kernel/k_event.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_scoped_resource_reservation.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/svc.h"
+
+namespace Kernel::Svc {
+
+Result SignalEvent(Core::System& system, Handle event_handle) {
+    LOG_DEBUG(Kernel_SVC, "called, event_handle=0x{:08X}", event_handle);
+
+    // Get the current handle table.
+    const KHandleTable& handle_table = system.Kernel().CurrentProcess()->GetHandleTable();
+
+    // Get the event.
+    KScopedAutoObject event = handle_table.GetObject<KEvent>(event_handle);
+    R_UNLESS(event.IsNotNull(), ResultInvalidHandle);
+
+    return event->Signal();
+}
+
+Result SignalEvent32(Core::System& system, Handle event_handle) {
+    return SignalEvent(system, event_handle);
+}
+
+Result ClearEvent(Core::System& system, Handle event_handle) {
+    LOG_TRACE(Kernel_SVC, "called, event_handle=0x{:08X}", event_handle);
+
+    // Get the current handle table.
+    const auto& handle_table = system.Kernel().CurrentProcess()->GetHandleTable();
+
+    // Try to clear the writable event.
+    {
+        KScopedAutoObject event = handle_table.GetObject<KEvent>(event_handle);
+        if (event.IsNotNull()) {
+            return event->Clear();
+        }
+    }
+
+    // Try to clear the readable event.
+    {
+        KScopedAutoObject readable_event = handle_table.GetObject<KReadableEvent>(event_handle);
+        if (readable_event.IsNotNull()) {
+            return readable_event->Clear();
+        }
+    }
+
+    LOG_ERROR(Kernel_SVC, "Event handle does not exist, event_handle=0x{:08X}", event_handle);
+
+    return ResultInvalidHandle;
+}
+
+Result ClearEvent32(Core::System& system, Handle event_handle) {
+    return ClearEvent(system, event_handle);
+}
+
+Result CreateEvent(Core::System& system, Handle* out_write, Handle* out_read) {
+    LOG_DEBUG(Kernel_SVC, "called");
+
+    // Get the kernel reference and handle table.
+    auto& kernel = system.Kernel();
+    auto& handle_table = kernel.CurrentProcess()->GetHandleTable();
+
+    // Reserve a new event from the process resource limit
+    KScopedResourceReservation event_reservation(kernel.CurrentProcess(),
+                                                 LimitableResource::EventCountMax);
+    R_UNLESS(event_reservation.Succeeded(), ResultLimitReached);
+
+    // Create a new event.
+    KEvent* event = KEvent::Create(kernel);
+    R_UNLESS(event != nullptr, ResultOutOfResource);
+
+    // Initialize the event.
+    event->Initialize(kernel.CurrentProcess());
+
+    // Commit the thread reservation.
+    event_reservation.Commit();
+
+    // Ensure that we clean up the event (and its only references are handle table) on function end.
+    SCOPE_EXIT({
+        event->GetReadableEvent().Close();
+        event->Close();
+    });
+
+    // Register the event.
+    KEvent::Register(kernel, event);
+
+    // Add the event to the handle table.
+    R_TRY(handle_table.Add(out_write, event));
+
+    // Ensure that we maintaing a clean handle state on exit.
+    auto handle_guard = SCOPE_GUARD({ handle_table.Remove(*out_write); });
+
+    // Add the readable event to the handle table.
+    R_TRY(handle_table.Add(out_read, std::addressof(event->GetReadableEvent())));
+
+    // We succeeded.
+    handle_guard.Cancel();
+    return ResultSuccess;
+}
+
+Result CreateEvent32(Core::System& system, Handle* out_write, Handle* out_read) {
+    return CreateEvent(system, out_write, out_read);
+}
+
+} // namespace Kernel::Svc