From 5bae5a48b90cc9f6c847040e6f486296ed135017 Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Sat, 30 Sep 2017 13:19:58 -0500
Subject: [PATCH] Services/NIM: Implement CheckForSysUpdateEvent.

Implementation verified by reverse engineering.
This lets the Home Menu boot without crashing on startup.
---
 src/core/hle/service/nim/nim.cpp   | 18 +++++++++++++++++-
 src/core/hle/service/nim/nim.h     | 11 +++++++++++
 src/core/hle/service/nim/nim_u.cpp |  2 +-
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/src/core/hle/service/nim/nim.cpp b/src/core/hle/service/nim/nim.cpp
index d5624fe54..b10d5852b 100644
--- a/src/core/hle/service/nim/nim.cpp
+++ b/src/core/hle/service/nim/nim.cpp
@@ -5,6 +5,8 @@
 #include "common/common_types.h"
 #include "common/logging/log.h"
 #include "core/hle/ipc.h"
+#include "core/hle/ipc_helpers.h"
+#include "core/hle/kernel/event.h"
 #include "core/hle/service/nim/nim.h"
 #include "core/hle/service/nim/nim_aoc.h"
 #include "core/hle/service/nim/nim_s.h"
@@ -14,6 +16,16 @@
 namespace Service {
 namespace NIM {
 
+static Kernel::SharedPtr<Kernel::Event> nim_system_update_event;
+
+void CheckForSysUpdateEvent(Service::Interface* self) {
+    IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x5, 0, 0); // 0x50000
+    IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
+    rb.Push(RESULT_SUCCESS);
+    rb.PushCopyHandles(Kernel::g_handle_table.Create(nim_system_update_event).Unwrap());
+    LOG_TRACE(Service_NIM, "called");
+}
+
 void CheckSysUpdateAvailable(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
@@ -29,9 +41,13 @@ void Init() {
     AddService(new NIM_AOC_Interface);
     AddService(new NIM_S_Interface);
     AddService(new NIM_U_Interface);
+
+    nim_system_update_event = Kernel::Event::Create(ResetType::OneShot, "NIM System Update Event");
 }
 
-void Shutdown() {}
+void Shutdown() {
+    nim_system_update_event = nullptr;
+}
 
 } // namespace NIM
 
diff --git a/src/core/hle/service/nim/nim.h b/src/core/hle/service/nim/nim.h
index c3106f18b..dbf605e5a 100644
--- a/src/core/hle/service/nim/nim.h
+++ b/src/core/hle/service/nim/nim.h
@@ -10,6 +10,17 @@ class Interface;
 
 namespace NIM {
 
+/**
+ * NIM::CheckForSysUpdateEvent service function
+ *  Inputs:
+ *      1 : None
+ *  Outputs:
+ *      1 : Result of function, 0 on success, otherwise error code
+ *      2 : Copy handle descriptor
+ *      3 : System Update event handle
+ */
+void CheckForSysUpdateEvent(Service::Interface* self);
+
 /**
  * NIM::CheckSysUpdateAvailable service function
  *  Inputs:
diff --git a/src/core/hle/service/nim/nim_u.cpp b/src/core/hle/service/nim/nim_u.cpp
index 7664bad60..569660278 100644
--- a/src/core/hle/service/nim/nim_u.cpp
+++ b/src/core/hle/service/nim/nim_u.cpp
@@ -12,7 +12,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x00010000, nullptr, "StartSysUpdate"},
     {0x00020000, nullptr, "GetUpdateDownloadProgress"},
     {0x00040000, nullptr, "FinishTitlesInstall"},
-    {0x00050000, nullptr, "CheckForSysUpdateEvent"},
+    {0x00050000, CheckForSysUpdateEvent, "CheckForSysUpdateEvent"},
     {0x00090000, CheckSysUpdateAvailable, "CheckSysUpdateAvailable"},
     {0x000A0000, nullptr, "GetState"},
     {0x000B0000, nullptr, "GetSystemTitleHash"},