5 files changed, 41 insertions, 2 deletions
diff --git a/src/core/hle/kernel/thread.cpp b/src/core/hle/kernel/thread.cpp
index 2614a260c..0f7970ebe 100644
--- a/src/core/hle/kernel/thread.cpp
+++ b/src/core/hle/kernel/thread.cpp
@@ -541,6 +541,12 @@ s32 Thread::GetWaitObjectIndex(WaitObject* object) const {
     return static_cast<s32>(std::distance(match, wait_objects.rend()) - 1);
 }
 
+VAddr Thread::GetCommandBufferAddress() const {
+    // Offset from the start of TLS at which the IPC command buffer begins.
+    static constexpr int CommandHeaderOffset = 0x80;
+    return GetTLSAddress() + CommandHeaderOffset;
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
 void ThreadingInit() {
diff --git a/src/core/hle/kernel/thread.h b/src/core/hle/kernel/thread.h
index 4679c2022..314fba81f 100644
--- a/src/core/hle/kernel/thread.h
+++ b/src/core/hle/kernel/thread.h
@@ -164,6 +164,12 @@ public:
         return tls_address;
     }
 
+    /*
+     * Returns the address of the current thread's command buffer, located in the TLS.
+     * @returns VAddr of the thread's command buffer.
+     */
+    VAddr GetCommandBufferAddress() const;
+
     /**
      * Returns whether this thread is waiting for all the objects in
      * its wait list to become ready, as a result of a WaitSynchronizationN call
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
@@ -11,6 +11,17 @@ 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:
  *      1 : None
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"},