Implement/Stub mnpp:app service and some hid calls (#3131)

* Implement/Stub mnpp:app service and some hid calls

This PR Implement/Stub the `mnpp:app` service (closes #3107) accordingly to RE, which seems to do some telemetry for China region only, so everything is stubbed.

This PR fixes some inconsistencies in the hid service too and stub EnableSixAxisSensorUnalteredPassthrough, IsSixAxisSensorUnalteredPassthroughEnabled, LoadSixAxisSensorCalibrationParameter, GetSixAxisSensorIcInformation calls (closes #3123 and closes #3124).

* Addresses Thog review

ARMeilleure/Decoders/IOpCode32Alu.cs

@@ -1,10 +1,8 @@
 namespace ARMeilleure.Decoders
 {
-    interface IOpCode32Alu : IOpCode32
+    interface IOpCode32Alu : IOpCode32, IOpCode32HasSetFlags
     {
         int Rd { get; }
         int Rn { get; }
-
-        bool? SetFlags { get; }
     }
 }

ARMeilleure/Decoders/IOpCode32HasSetFlags.cs

@@ -0,0 +1,7 @@
+namespace ARMeilleure.Decoders
+{
+    interface IOpCode32HasSetFlags
+    {
+        bool? SetFlags { get; }
+    }
+}

ARMeilleure/Decoders/OpCode32AluUmull.cs

@@ -1,6 +1,6 @@
 namespace ARMeilleure.Decoders
 {
-    class OpCode32AluUmull : OpCode32
+    class OpCode32AluUmull : OpCode32, IOpCode32HasSetFlags
     {
         public int RdLo { get; }
         public int RdHi { get; }

ARMeilleure/Instructions/InstEmitAluHelper.cs

@@ -14,7 +14,7 @@ namespace ARMeilleure.Instructions
     {
         public static bool ShouldSetFlags(ArmEmitterContext context)
         {
-            IOpCode32Alu op = (IOpCode32Alu)context.CurrOp;
+            IOpCode32HasSetFlags op = (IOpCode32HasSetFlags)context.CurrOp;
 
             if (op.SetFlags == null)
             {

Ryujinx.Common/Logging/LogClass.cs

@@ -39,6 +39,7 @@ namespace Ryujinx.Common.Logging
         ServiceLm,
         ServiceMii,
         ServiceMm,
+        ServiceMnpp,
         ServiceNfc,
         ServiceNfp,
         ServiceNgct,

Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/SystemAppletProxy/IWindowController.cs

@@ -15,12 +15,12 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.Sys
         // GetAppletResourceUserId() -> nn::applet::AppletResourceUserId
         public ResultCode GetAppletResourceUserId(ServiceCtx context)
         {
-            Logger.Stub?.PrintStub(LogClass.ServiceAm);
-
             long appletResourceUserId = context.Device.System.AppletState.AppletResourceUserIds.Add(_pid);
 
             context.ResponseData.Write(appletResourceUserId);
 
+            Logger.Stub?.PrintStub(LogClass.ServiceAm, new { appletResourceUserId });
+
             return ResultCode.Success;
         }
 

Ryujinx.HLE/HOS/Services/Hid/IHidServer.cs

@@ -24,6 +24,7 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         private bool _vibrationPermitted;
         private bool _usbFullKeyControllerEnabled;
         private bool _isFirmwareUpdateAvailableForSixAxisSensor;
+        private bool _isSixAxisSensorUnalteredPassthroughEnabled;
 
         private HidNpadJoyAssignmentMode      _npadJoyAssignmentMode;
         private HidNpadHandheldActivationMode _npadHandheldActivationMode;
@@ -335,7 +336,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // StartSixAxisSensor(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId)
         public ResultCode StartSixAxisSensor(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle });
@@ -347,7 +349,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // StopSixAxisSensor(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId)
         public ResultCode StopSixAxisSensor(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle });
@@ -359,7 +362,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // IsSixAxisSensorFusionEnabled(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId) -> bool IsEnabled
         public ResultCode IsSixAxisSensorFusionEnabled(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             context.ResponseData.Write(_sixAxisSensorFusionEnabled);
@@ -373,9 +377,9 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // EnableSixAxisSensorFusion(bool Enabled, nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId)
         public ResultCode EnableSixAxisSensorFusion(ServiceCtx context)
         {
-            _sixAxisSensorFusionEnabled = context.RequestData.ReadBoolean();
-            int  sixAxisSensorHandle    = context.RequestData.ReadInt32();
-            long appletResourceUserId   = context.RequestData.ReadInt64();
+            _sixAxisSensorFusionEnabled = context.RequestData.ReadUInt32() != 0;
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            long appletResourceUserId = context.RequestData.ReadInt64();
 
             Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle, _sixAxisSensorFusionEnabled });
 
@@ -386,7 +390,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // SetSixAxisSensorFusionParameters(nn::hid::SixAxisSensorHandle, float RevisePower, float ReviseRange, nn::applet::AppletResourceUserId)
         public ResultCode SetSixAxisSensorFusionParameters(ServiceCtx context)
         {
-            int   sixAxisSensorHandle = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
 
             _sensorFusionParams = new HidSensorFusionParameters
             {
@@ -405,7 +410,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // GetSixAxisSensorFusionParameters(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId) -> float RevisePower, float ReviseRange)
         public ResultCode GetSixAxisSensorFusionParameters(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             context.ResponseData.Write(_sensorFusionParams.RevisePower);
@@ -420,7 +426,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // ResetSixAxisSensorFusionParameters(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId)
         public ResultCode ResetSixAxisSensorFusionParameters(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             _sensorFusionParams.RevisePower = 0;
@@ -436,6 +443,7 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         public ResultCode SetAccelerometerParameters(ServiceCtx context)
         {
             int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
 
             _accelerometerParams = new HidAccelerometerParameters
             {
@@ -454,7 +462,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // GetAccelerometerParameters(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId) -> float X, float Y
         public ResultCode GetAccelerometerParameters(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             context.ResponseData.Write(_accelerometerParams.X);
@@ -469,7 +478,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // ResetAccelerometerParameters(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId)
         public ResultCode ResetAccelerometerParameters(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             _accelerometerParams.X = 0;
@@ -484,9 +494,10 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // SetAccelerometerPlayMode(nn::hid::SixAxisSensorHandle, uint PlayMode, nn::applet::AppletResourceUserId)
         public ResultCode SetAccelerometerPlayMode(ServiceCtx context)
         {
-            int  sixAxisSensorHandle    = context.RequestData.ReadInt32();
-                 _accelerometerPlayMode = context.RequestData.ReadUInt32();
-            long appletResourceUserId   = context.RequestData.ReadInt64();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
+            _accelerometerPlayMode = context.RequestData.ReadUInt32();
+            long appletResourceUserId = context.RequestData.ReadInt64();
 
             Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle, _accelerometerPlayMode });
 
@@ -497,7 +508,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // GetAccelerometerPlayMode(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId) -> uint PlayMode
         public ResultCode GetAccelerometerPlayMode(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             context.ResponseData.Write(_accelerometerPlayMode);
@@ -511,7 +523,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // ResetAccelerometerPlayMode(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId)
         public ResultCode ResetAccelerometerPlayMode(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             _accelerometerPlayMode = 0;
@@ -525,9 +538,9 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // SetGyroscopeZeroDriftMode(nn::hid::SixAxisSensorHandle, uint GyroscopeZeroDriftMode, nn::applet::AppletResourceUserId)
         public ResultCode SetGyroscopeZeroDriftMode(ServiceCtx context)
         {
-            int  sixAxisSensorHandle     = context.RequestData.ReadInt32();
-                 _gyroscopeZeroDriftMode = (HidGyroscopeZeroDriftMode)context.RequestData.ReadInt32();
-            long appletResourceUserId    = context.RequestData.ReadInt64();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            _gyroscopeZeroDriftMode = (HidGyroscopeZeroDriftMode)context.RequestData.ReadInt32();
+            long appletResourceUserId = context.RequestData.ReadInt64();
 
             Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle, _gyroscopeZeroDriftMode });
 
@@ -538,7 +551,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // GetGyroscopeZeroDriftMode(nn::applet::AppletResourceUserId, nn::hid::SixAxisSensorHandle) -> int GyroscopeZeroDriftMode
         public ResultCode GetGyroscopeZeroDriftMode(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             context.ResponseData.Write((int)_gyroscopeZeroDriftMode);
@@ -552,7 +566,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // ResetGyroscopeZeroDriftMode(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId)
         public ResultCode ResetGyroscopeZeroDriftMode(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             _gyroscopeZeroDriftMode = HidGyroscopeZeroDriftMode.Standard;
@@ -566,7 +581,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // IsSixAxisSensorAtRest(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId) -> bool IsAsRest
         public ResultCode IsSixAxisSensorAtRest(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             bool isAtRest = true;
@@ -582,8 +598,8 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         // IsFirmwareUpdateAvailableForSixAxisSensor(nn::hid::AppletResourceUserId, nn::hid::SixAxisSensorHandle, pid) -> bool UpdateAvailable
         public ResultCode IsFirmwareUpdateAvailableForSixAxisSensor(ServiceCtx context)
         {
-            int  sixAxisSensorHandle  = context.RequestData.ReadInt32();
-            context.RequestData.BaseStream.Position += 4;
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
             context.ResponseData.Write(_isFirmwareUpdateAvailableForSixAxisSensor);
@@ -593,6 +609,64 @@ namespace Ryujinx.HLE.HOS.Services.Hid
             return ResultCode.Success;
         }
 
+        [CommandHipc(84)] // 13.0.0+
+        // EnableSixAxisSensorUnalteredPassthrough(nn::applet::AppletResourceUserId, nn::hid::SixAxisSensorHandle, u8 enabled)
+        public ResultCode EnableSixAxisSensorUnalteredPassthrough(ServiceCtx context)
+        {
+            _isSixAxisSensorUnalteredPassthroughEnabled = context.RequestData.ReadUInt32() != 0;
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            long appletResourceUserId = context.RequestData.ReadInt64();
+
+            Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle, _isSixAxisSensorUnalteredPassthroughEnabled });
+
+            return ResultCode.Success;
+        }
+
+        [CommandHipc(85)] // 13.0.0+
+        // IsSixAxisSensorUnalteredPassthroughEnabled(nn::applet::AppletResourceUserId, nn::hid::SixAxisSensorHandle) -> u8 enabled
+        public ResultCode IsSixAxisSensorUnalteredPassthroughEnabled(ServiceCtx context)
+        {
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
+            long appletResourceUserId = context.RequestData.ReadInt64();
+
+            context.ResponseData.Write(_isSixAxisSensorUnalteredPassthroughEnabled);
+
+            Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle });
+
+            return ResultCode.Success;
+        }
+
+        [CommandHipc(87)] // 13.0.0+
+        // LoadSixAxisSensorCalibrationParameter(nn::applet::AppletResourceUserId, nn::hid::SixAxisSensorHandle, u64 unknown)
+        public ResultCode LoadSixAxisSensorCalibrationParameter(ServiceCtx context)
+        {
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
+            long appletResourceUserId = context.RequestData.ReadInt64();
+
+            // TODO: CalibrationParameter have to be determined.
+
+            Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle });
+
+            return ResultCode.Success;
+        }
+
+        [CommandHipc(88)] // 13.0.0+
+        // GetSixAxisSensorIcInformation(nn::applet::AppletResourceUserId, nn::hid::SixAxisSensorHandle) -> u64 unknown
+        public ResultCode GetSixAxisSensorIcInformation(ServiceCtx context)
+        {
+            int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
+            long appletResourceUserId = context.RequestData.ReadInt64();
+
+            // TODO: IcInformation have to be determined.
+
+            Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle });
+
+            return ResultCode.Success;
+        }
+
         [CommandHipc(91)]
         // ActivateGesture(nn::applet::AppletResourceUserId, int Unknown0)
         public ResultCode ActivateGesture(ServiceCtx context)
@@ -606,16 +680,15 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         }
 
         [CommandHipc(100)]
-        // SetSupportedNpadStyleSet(nn::applet::AppletResourceUserId, nn::hid::NpadStyleTag)
+        // SetSupportedNpadStyleSet(pid, nn::applet::AppletResourceUserId, nn::hid::NpadStyleTag)
         public ResultCode SetSupportedNpadStyleSet(ServiceCtx context)
         {
+            ulong pid = context.Request.HandleDesc.PId;
             ControllerType type = (ControllerType)context.RequestData.ReadInt32();
+            context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
-            Logger.Stub?.PrintStub(LogClass.ServiceHid, new {
-                    appletResourceUserId,
-                    type
-                });
+            Logger.Stub?.PrintStub(LogClass.ServiceHid, new { pid, appletResourceUserId, type });
 
             context.Device.Hid.Npads.SupportedStyleSets = type;
 
@@ -623,17 +696,15 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         }
 
         [CommandHipc(101)]
-        // GetSupportedNpadStyleSet(nn::applet::AppletResourceUserId) -> uint nn::hid::NpadStyleTag
+        // GetSupportedNpadStyleSet(pid, nn::applet::AppletResourceUserId) -> uint nn::hid::NpadStyleTag
         public ResultCode GetSupportedNpadStyleSet(ServiceCtx context)
         {
-            long appletResourceUserId = context.RequestData.ReadInt64();
+            ulong pid                  = context.Request.HandleDesc.PId;
+            long  appletResourceUserId = context.RequestData.ReadInt64();
 
             context.ResponseData.Write((int)context.Device.Hid.Npads.SupportedStyleSets);
 
-            Logger.Stub?.PrintStub(LogClass.ServiceHid, new {
-                    appletResourceUserId,
-                    context.Device.Hid.Npads.SupportedStyleSets
-                });
+            Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, context.Device.Hid.Npads.SupportedStyleSets });
 
             return ResultCode.Success;
         }
@@ -658,7 +729,7 @@ namespace Ryujinx.HLE.HOS.Services.Hid
                 }
             }
 
-            Logger.Stub?.PrintStub(LogClass.ServiceHid, $"{supportedPlayerIds.Length} " + string.Join(",", supportedPlayerIds.ToArray()));
+            Logger.Stub?.PrintStub(LogClass.ServiceHid, $"{supportedPlayerIds.Length} Players: " + string.Join(",", supportedPlayerIds.ToArray()));
 
             return ResultCode.Success;
         }

Ryujinx.HLE/HOS/Services/Mnpp/IServiceForApplication.cs

@@ -0,0 +1,63 @@
+using Ryujinx.Common;
+using Ryujinx.Common.Logging;
+using Ryujinx.Cpu;
+using Ryujinx.HLE.HOS.Services.Account.Acc;
+
+namespace Ryujinx.HLE.HOS.Services.Mnpp
+{
+    [Service("mnpp:app")] // 13.0.0+
+    class IServiceForApplication : IpcService
+    {
+        public IServiceForApplication(ServiceCtx context) { }
+
+        [CommandHipc(0)]
+        // Initialize(pid)
+        public ResultCode Initialize(ServiceCtx context)
+        {
+            // Pid placeholder
+            context.RequestData.ReadInt64();
+            ulong pid = context.Request.HandleDesc.PId;
+
+            // TODO: Service calls set:sys GetPlatformRegion.
+            //       If the result == 1 (China) it calls arp:r GetApplicationInstanceId and GetApplicationLaunchProperty to get the title id and store it internally.
+            //       If not, it does nothing.
+
+            Logger.Stub?.PrintStub(LogClass.ServiceMnpp, new { pid });
+
+            return ResultCode.Success;
+        }
+
+        [CommandHipc(1)]
+        // SendRawTelemetryData(nn::account::Uid user_id, buffer<bytes, 5> title_id)
+        public ResultCode SendRawTelemetryData(ServiceCtx context)
+        {
+            ulong titleIdInputPosition = context.Request.SendBuff[0].Position;
+            ulong titleIdInputSize     = context.Request.SendBuff[0].Size;
+
+            UserId userId = context.RequestData.ReadStruct<UserId>();
+
+            // TODO: Service calls set:sys GetPlatformRegion.
+            //       If the result != 1 (China) it returns ResultCode.Success.
+
+            if (userId.IsNull)
+            {
+                return ResultCode.InvalidArgument;
+            }
+
+            if (titleIdInputSize <= 64)
+            {
+                string titleId = MemoryHelper.ReadAsciiString(context.Memory, titleIdInputPosition, (long)titleIdInputSize);
+
+                // TODO: The service stores the titleId internally and seems proceed to some telemetry for China, which is not needed here.
+
+                Logger.Stub?.PrintStub(LogClass.ServiceMnpp, new { userId, titleId });
+
+                return ResultCode.Success;
+            }
+
+            Logger.Stub?.PrintStub(LogClass.ServiceMnpp, new { userId });
+
+            return ResultCode.InvalidBufferSize;
+        }
+    }
+}

Ryujinx.HLE/HOS/Services/Mnpp/ResultCode.cs

@@ -0,0 +1,13 @@
+namespace Ryujinx.HLE.HOS.Services.Mnpp
+{
+    enum ResultCode
+    {
+        ModuleId       = 239,
+        ErrorCodeShift = 9,
+
+        Success = 0,
+
+        InvalidArgument   = (100 << ErrorCodeShift) | ModuleId,
+        InvalidBufferSize = (101 << ErrorCodeShift) | ModuleId
+    }
+}