From dae799dbb5ebe4389befb58f55c3a97322a924c4 Mon Sep 17 00:00:00 2001
From: Billy Laws <blaws05@gmail.com>
Date: Thu, 9 Jul 2020 14:10:18 +0100
Subject: [PATCH] Implement svcClearEvent

This removes a signal from a KEvent. It is used by Mario Odyssey.
---
 app/src/main/cpp/skyline/kernel/svc.cpp | 6 ++++++
 app/src/main/cpp/skyline/kernel/svc.h   | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/app/src/main/cpp/skyline/kernel/svc.cpp b/app/src/main/cpp/skyline/kernel/svc.cpp
index 124e9c5d..7eb51f36 100644
--- a/app/src/main/cpp/skyline/kernel/svc.cpp
+++ b/app/src/main/cpp/skyline/kernel/svc.cpp
@@ -300,6 +300,12 @@ namespace skyline::kernel::svc {
         }
     }
 
+    void ClearEvent(DeviceState &state) {
+        auto object = state.process->GetHandle<type::KEvent>(state.ctx->registers.w0);
+        object->signalled = false;
+        state.ctx->registers.w0 = constant::status::Success;
+    }
+
     void MapSharedMemory(DeviceState &state) {
         try {
             auto object = state.process->GetHandle<type::KSharedMemory>(state.ctx->registers.w0);
diff --git a/app/src/main/cpp/skyline/kernel/svc.h b/app/src/main/cpp/skyline/kernel/svc.h
index fd788f7e..de853aa5 100644
--- a/app/src/main/cpp/skyline/kernel/svc.h
+++ b/app/src/main/cpp/skyline/kernel/svc.h
@@ -100,6 +100,11 @@ namespace skyline {
          */
         void SetThreadPriority(DeviceState &state);
 
+        /**
+         * @brief Clears a KEvent of it's signal (https://switchbrew.org/wiki/SVC#ClearEvent)
+         */
+        void ClearEvent(DeviceState &state);
+
         /**
          * @brief Maps the block supplied by the handle (https://switchbrew.org/wiki/SVC#MapSharedMemory)
          */
@@ -202,7 +207,7 @@ namespace skyline {
             nullptr, // 0x0f
             nullptr, // 0x10
             nullptr, // 0x11
-            nullptr, // 0x12
+            ClearEvent, // 0x12
             MapSharedMemory, // 0x13
             nullptr, // 0x14
             CreateTransferMemory, // 0x15