ntc: Implement IEnsureNetworkClockAvailabilityService (#3192)

* ntc: Implement IEnsureNetworkClockAvailabilityService

This PR implement a basic `IEnsureNetworkClockAvailabilityService` checked by RE. It's needed by Splatoon 2 with Guest Internet Access enabled. Game is now playable with this setting.

* Update Ryujinx.HLE/HOS/Services/Nim/Ntc/StaticService/IEnsureNetworkClockAvailabilityService.cs

Co-authored-by: gdkchan <gab.dark.100@gmail.com>

Co-authored-by: gdkchan <gab.dark.100@gmail.com>

Ryujinx.Common/Logging/LogClass.cs

@@ -47,6 +47,7 @@ namespace Ryujinx.Common.Logging
         ServiceNim,
         ServiceNs,
         ServiceNsd,
+        ServiceNtc,
         ServiceNv,
         ServiceOlsc,
         ServicePctl,

Ryujinx.Graphics.GAL/Format.cs

@@ -52,7 +52,7 @@ namespace Ryujinx.Graphics.GAL
         R32G32B32A32Sint,
         S8Uint,
         D16Unorm,
-        D24X8Unorm,
+        S8UintD24Unorm,
         D32Float,
         D24UnormS8Uint,
         D32FloatS8Uint,
@@ -266,7 +266,7 @@ namespace Ryujinx.Graphics.GAL
             {
                 case Format.D16Unorm:
                 case Format.D24UnormS8Uint:
-                case Format.D24X8Unorm:
+                case Format.S8UintD24Unorm:
                 case Format.D32Float:
                 case Format.D32FloatS8Uint:
                 case Format.S8Uint:

Ryujinx.Graphics.Gpu/Engine/Types/ZetaFormat.cs

@@ -28,13 +28,13 @@ namespace Ryujinx.Graphics.Gpu.Engine.Types
         {
             return format switch
             {
-                ZetaFormat.D32Float          => new FormatInfo(Format.D32Float,          1, 1, 4,  1),
-                ZetaFormat.D16Unorm          => new FormatInfo(Format.D16Unorm,          1, 1, 2,  1),
-                ZetaFormat.D24UnormS8Uint    => new FormatInfo(Format.D24UnormS8Uint,    1, 1, 4,  2),
-                ZetaFormat.D24Unorm          => new FormatInfo(Format.D24UnormS8Uint,    1, 1, 4,  1),
-                ZetaFormat.S8UintD24Unorm    => new FormatInfo(Format.D24UnormS8Uint,    1, 1, 4,  2),
-                ZetaFormat.S8Uint            => new FormatInfo(Format.S8Uint,            1, 1, 1,  1),
-                ZetaFormat.D32FloatS8Uint    => new FormatInfo(Format.D32FloatS8Uint,    1, 1, 8,  2),
+                ZetaFormat.D32Float          => new FormatInfo(Format.D32Float,       1, 1, 4, 1),
+                ZetaFormat.D16Unorm          => new FormatInfo(Format.D16Unorm,       1, 1, 2, 1),
+                ZetaFormat.D24UnormS8Uint    => new FormatInfo(Format.D24UnormS8Uint, 1, 1, 4, 2),
+                ZetaFormat.D24Unorm          => new FormatInfo(Format.D24UnormS8Uint, 1, 1, 4, 1),
+                ZetaFormat.S8UintD24Unorm    => new FormatInfo(Format.S8UintD24Unorm, 1, 1, 4, 2),
+                ZetaFormat.S8Uint            => new FormatInfo(Format.S8Uint,         1, 1, 1, 1),
+                ZetaFormat.D32FloatS8Uint    => new FormatInfo(Format.D32FloatS8Uint, 1, 1, 8, 2),
                 _                            => FormatInfo.Default
             };
         }

Ryujinx.Graphics.Gpu/Image/FormatTable.cs

@@ -55,6 +55,7 @@ namespace Ryujinx.Graphics.Gpu.Image
             { 0x24a0e, new FormatInfo(Format.D24UnormS8Uint,    1,  1,  4,  2) },
             { 0x24a29, new FormatInfo(Format.D24UnormS8Uint,    1,  1,  4,  2) },
             { 0x48a29, new FormatInfo(Format.D24UnormS8Uint,    1,  1,  4,  2) },
+            { 0x4912b, new FormatInfo(Format.S8UintD24Unorm,    1,  1,  4,  2) },
             { 0x25385, new FormatInfo(Format.D32FloatS8Uint,    1,  1,  8,  2) },
             { 0x253b0, new FormatInfo(Format.D32FloatS8Uint,    1,  1,  8,  2) },
             { 0xa4908, new FormatInfo(Format.R8G8B8A8Srgb,      1,  1,  4,  4) },

Ryujinx.Graphics.Gpu/Image/TextureCompatibility.cs

@@ -203,7 +203,7 @@ namespace Ryujinx.Graphics.Gpu.Image
                 }
 
                 if ((lhs.FormatInfo.Format == Format.D24UnormS8Uint ||
-                     lhs.FormatInfo.Format == Format.D24X8Unorm) && rhs.FormatInfo.Format == Format.B8G8R8A8Unorm)
+                     lhs.FormatInfo.Format == Format.S8UintD24Unorm) && rhs.FormatInfo.Format == Format.B8G8R8A8Unorm)
                 {
                     return TextureMatchQuality.FormatAlias;
                 }

Ryujinx.Graphics.Gpu/Image/TexturePool.cs

@@ -362,7 +362,7 @@ namespace Ryujinx.Graphics.Gpu.Image
                 return DepthStencilMode.Depth;
             }
 
-            if (format == Format.D24X8Unorm || format == Format.D24UnormS8Uint)
+            if (format == Format.D24UnormS8Uint)
             {
                 return component == SwizzleComponent.Red
                     ? DepthStencilMode.Stencil

Ryujinx.Graphics.Gpu/Memory/BufferCache.cs

@@ -17,6 +17,8 @@ namespace Ryujinx.Graphics.Gpu.Memory
         private const ulong BufferAlignmentSize = 0x1000;
         private const ulong BufferAlignmentMask = BufferAlignmentSize - 1;
 
+        private const ulong MaxDynamicGrowthSize = 0x100000;
+
         private readonly GpuContext _context;
         private readonly PhysicalMemory _physicalMemory;
 
@@ -166,10 +168,35 @@ namespace Ryujinx.Graphics.Gpu.Memory
                 // Otherwise, we must delete the overlapping buffers and create a bigger buffer
                 // that fits all the data we need. We also need to copy the contents from the
                 // old buffer(s) to the new buffer.
+
                 ulong endAddress = address + size;
 
                 if (_bufferOverlaps[0].Address > address || _bufferOverlaps[0].EndAddress < endAddress)
                 {
+                    // Check if the following conditions are met:
+                    // - We have a single overlap.
+                    // - The overlap starts at or before the requested range. That is, the overlap happens at the end.
+                    // - The size delta between the new, merged buffer and the old one is of at most 2 pages.
+                    // In this case, we attempt to extend the buffer further than the requested range,
+                    // this can potentially avoid future resizes if the application keeps using overlapping
+                    // sequential memory.
+                    // Allowing for 2 pages (rather than just one) is necessary to catch cases where the
+                    // range crosses a page, and after alignment, ends having a size of 2 pages.
+                    if (overlapsCount == 1 &&
+                        address >= _bufferOverlaps[0].Address &&
+                        endAddress - _bufferOverlaps[0].EndAddress <= BufferAlignmentSize * 2)
+                    {
+                        // Try to grow the buffer by 1.5x of its current size.
+                        // This improves performance in the cases where the buffer is resized often by small amounts.
+                        ulong existingSize = _bufferOverlaps[0].Size;
+                        ulong growthSize = (existingSize + Math.Min(existingSize >> 1, MaxDynamicGrowthSize)) & ~BufferAlignmentMask;
+
+                        size = Math.Max(size, growthSize);
+                        endAddress = address + size;
+
+                        overlapsCount = _buffers.FindOverlapsNonOverlapping(address, size, ref _bufferOverlaps);
+                    }
+
                     for (int index = 0; index < overlapsCount; index++)
                     {
                         Buffer buffer = _bufferOverlaps[index];
@@ -183,7 +210,9 @@ namespace Ryujinx.Graphics.Gpu.Memory
                         }
                     }
 
-                    Buffer newBuffer = new Buffer(_context, _physicalMemory, address, endAddress - address, _bufferOverlaps.Take(overlapsCount));
+                    ulong newSize = endAddress - address;
+
+                    Buffer newBuffer = new Buffer(_context, _physicalMemory, address, newSize, _bufferOverlaps.Take(overlapsCount));
 
                     lock (_buffers)
                     {
@@ -202,7 +231,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
                         buffer.DisposeData();
                     }
 
-                    newBuffer.SynchronizeMemory(address, endAddress - address);
+                    newBuffer.SynchronizeMemory(address, newSize);
 
                     // Existing buffers were modified, we need to rebind everything.
                     NotifyBuffersModified?.Invoke();

Ryujinx.Graphics.OpenGL/FormatTable.cs

@@ -6,15 +6,15 @@ namespace Ryujinx.Graphics.OpenGL
 {
     struct FormatTable
     {
-        private static FormatInfo[] Table;
-        private static SizedInternalFormat[] TableImage;
+        private static FormatInfo[] _table;
+        private static SizedInternalFormat[] _tableImage;
 
         static FormatTable()
         {
             int tableSize = Enum.GetNames<Format>().Length;
 
-            Table = new FormatInfo[tableSize];
-            TableImage = new SizedInternalFormat[tableSize];
+            _table = new FormatInfo[tableSize];
+            _tableImage = new SizedInternalFormat[tableSize];
 
             Add(Format.R8Unorm,             new FormatInfo(1, true,  false, All.R8,                PixelFormat.Red,            PixelType.UnsignedByte));
             Add(Format.R8Snorm,             new FormatInfo(1, true,  false, All.R8Snorm,           PixelFormat.Red,            PixelType.Byte));
@@ -66,7 +66,7 @@ namespace Ryujinx.Graphics.OpenGL
             Add(Format.R32G32B32A32Sint,    new FormatInfo(4, false, false, All.Rgba32i,           PixelFormat.RgbaInteger,    PixelType.Int));
             Add(Format.S8Uint,              new FormatInfo(1, false, false, All.StencilIndex8,     PixelFormat.StencilIndex,   PixelType.UnsignedByte));
             Add(Format.D16Unorm,            new FormatInfo(1, false, false, All.DepthComponent16,  PixelFormat.DepthComponent, PixelType.UnsignedShort));
-            Add(Format.D24X8Unorm,          new FormatInfo(1, false, false, All.DepthComponent24,  PixelFormat.DepthComponent, PixelType.UnsignedInt));
+            Add(Format.S8UintD24Unorm,      new FormatInfo(1, false, false, All.Depth24Stencil8,   PixelFormat.DepthStencil,   PixelType.UnsignedInt248));
             Add(Format.D32Float,            new FormatInfo(1, false, false, All.DepthComponent32f, PixelFormat.DepthComponent, PixelType.Float));
             Add(Format.D24UnormS8Uint,      new FormatInfo(1, false, false, All.Depth24Stencil8,   PixelFormat.DepthStencil,   PixelType.UnsignedInt248));
             Add(Format.D32FloatS8Uint,      new FormatInfo(1, false, false, All.Depth32fStencil8,  PixelFormat.DepthStencil,   PixelType.Float32UnsignedInt248Rev));
@@ -218,22 +218,22 @@ namespace Ryujinx.Graphics.OpenGL
 
         private static void Add(Format format, FormatInfo info)
         {
-            Table[(int)format] = info;
+            _table[(int)format] = info;
         }
 
         private static void Add(Format format, SizedInternalFormat sif)
         {
-            TableImage[(int)format] = sif;
+            _tableImage[(int)format] = sif;
         }
 
         public static FormatInfo GetFormatInfo(Format format)
         {
-            return Table[(int)format];
+            return _table[(int)format];
         }
 
         public static SizedInternalFormat GetImageFormat(Format format)
         {
-            return TableImage[(int)format];
+            return _tableImage[(int)format];
         }
     }
 }

Ryujinx.Graphics.OpenGL/Framebuffer.cs

@@ -127,14 +127,13 @@ namespace Ryujinx.Graphics.OpenGL
         private static bool IsPackedDepthStencilFormat(Format format)
         {
             return format == Format.D24UnormS8Uint ||
-                   format == Format.D32FloatS8Uint;
+                   format == Format.D32FloatS8Uint ||
+                   format == Format.S8UintD24Unorm;
         }
 
         private static bool IsDepthOnlyFormat(Format format)
         {
-            return format == Format.D16Unorm ||
-                   format == Format.D24X8Unorm ||
-                   format == Format.D32Float;
+            return format == Format.D16Unorm || format == Format.D32Float;
         }
 
         public void Dispose()

Ryujinx.Graphics.OpenGL/Image/FormatConverter.cs

@@ -0,0 +1,149 @@
+using System;
+using System.Numerics;
+using System.Runtime.InteropServices;
+using System.Runtime.Intrinsics;
+using System.Runtime.Intrinsics.X86;
+
+namespace Ryujinx.Graphics.OpenGL.Image
+{
+    static class FormatConverter
+    {
+        public unsafe static byte[] ConvertS8D24ToD24S8(ReadOnlySpan<byte> data)
+        {
+            byte[] output = new byte[data.Length];
+
+            int start = 0;
+
+            if (Avx2.IsSupported)
+            {
+                var mask = Vector256.Create(
+                    (byte)3, (byte)0, (byte)1, (byte)2,
+                    (byte)7, (byte)4, (byte)5, (byte)6,
+                    (byte)11, (byte)8, (byte)9, (byte)10,
+                    (byte)15, (byte)12, (byte)13, (byte)14,
+                    (byte)19, (byte)16, (byte)17, (byte)18,
+                    (byte)23, (byte)20, (byte)21, (byte)22,
+                    (byte)27, (byte)24, (byte)25, (byte)26,
+                    (byte)31, (byte)28, (byte)29, (byte)30);
+
+                int sizeAligned = data.Length & ~31;
+
+                fixed (byte* pInput = data, pOutput = output)
+                {
+                    for (uint i = 0; i < sizeAligned; i += 32)
+                    {
+                        var dataVec = Avx.LoadVector256(pInput + i);
+
+                        dataVec = Avx2.Shuffle(dataVec, mask);
+
+                        Avx.Store(pOutput + i, dataVec);
+                    }
+                }
+
+                start = sizeAligned;
+            }
+            else if (Ssse3.IsSupported)
+            {
+                var mask = Vector128.Create(
+                    (byte)3, (byte)0, (byte)1, (byte)2,
+                    (byte)7, (byte)4, (byte)5, (byte)6,
+                    (byte)11, (byte)8, (byte)9, (byte)10,
+                    (byte)15, (byte)12, (byte)13, (byte)14);
+
+                int sizeAligned = data.Length & ~15;
+
+                fixed (byte* pInput = data, pOutput = output)
+                {
+                    for (uint i = 0; i < sizeAligned; i += 16)
+                    {
+                        var dataVec = Sse2.LoadVector128(pInput + i);
+
+                        dataVec = Ssse3.Shuffle(dataVec, mask);
+
+                        Sse2.Store(pOutput + i, dataVec);
+                    }
+                }
+
+                start = sizeAligned;
+            }
+
+            var outSpan = MemoryMarshal.Cast<byte, uint>(output);
+            var dataSpan = MemoryMarshal.Cast<byte, uint>(data);
+            for (int i = start / sizeof(uint); i < dataSpan.Length; i++)
+            {
+                outSpan[i] = BitOperations.RotateLeft(dataSpan[i], 8);
+            }
+
+            return output;
+        }
+
+        public unsafe static byte[] ConvertD24S8ToS8D24(ReadOnlySpan<byte> data)
+        {
+            byte[] output = new byte[data.Length];
+
+            int start = 0;
+
+            if (Avx2.IsSupported)
+            {
+                var mask = Vector256.Create(
+                    (byte)1, (byte)2, (byte)3, (byte)0,
+                    (byte)5, (byte)6, (byte)7, (byte)4,
+                    (byte)9, (byte)10, (byte)11, (byte)8,
+                    (byte)13, (byte)14, (byte)15, (byte)12,
+                    (byte)17, (byte)18, (byte)19, (byte)16,
+                    (byte)21, (byte)22, (byte)23, (byte)20,
+                    (byte)25, (byte)26, (byte)27, (byte)24,
+                    (byte)29, (byte)30, (byte)31, (byte)28);
+
+                int sizeAligned = data.Length & ~31;
+
+                fixed (byte* pInput = data, pOutput = output)
+                {
+                    for (uint i = 0; i < sizeAligned; i += 32)
+                    {
+                        var dataVec = Avx.LoadVector256(pInput + i);
+
+                        dataVec = Avx2.Shuffle(dataVec, mask);
+
+                        Avx.Store(pOutput + i, dataVec);
+                    }
+                }
+
+                start = sizeAligned;
+            }
+            else if (Ssse3.IsSupported)
+            {
+                var mask = Vector128.Create(
+                    (byte)1, (byte)2, (byte)3, (byte)0,
+                    (byte)5, (byte)6, (byte)7, (byte)4,
+                    (byte)9, (byte)10, (byte)11, (byte)8,
+                    (byte)13, (byte)14, (byte)15, (byte)12);
+
+                int sizeAligned = data.Length & ~15;
+
+                fixed (byte* pInput = data, pOutput = output)
+                {
+                    for (uint i = 0; i < sizeAligned; i += 16)
+                    {
+                        var dataVec = Sse2.LoadVector128(pInput + i);
+
+                        dataVec = Ssse3.Shuffle(dataVec, mask);
+
+                        Sse2.Store(pOutput + i, dataVec);
+                    }
+                }
+
+                start = sizeAligned;
+            }
+
+            var outSpan = MemoryMarshal.Cast<byte, uint>(output);
+            var dataSpan = MemoryMarshal.Cast<byte, uint>(data);
+            for (int i = start / sizeof(uint); i < dataSpan.Length; i++)
+            {
+                outSpan[i] = BitOperations.RotateRight(dataSpan[i], 8);
+            }
+
+            return output;
+        }
+    }
+}

Ryujinx.Graphics.OpenGL/Image/TextureCopy.cs

@@ -291,7 +291,7 @@ namespace Ryujinx.Graphics.OpenGL.Image
 
         private static ClearBufferMask GetMask(Format format)
         {
-            if (format == Format.D24UnormS8Uint || format == Format.D32FloatS8Uint)
+            if (format == Format.D24UnormS8Uint || format == Format.D32FloatS8Uint || format == Format.S8UintD24Unorm)
             {
                 return ClearBufferMask.DepthBufferBit | ClearBufferMask.StencilBufferBit;
             }
@@ -311,9 +311,7 @@ namespace Ryujinx.Graphics.OpenGL.Image
 
         private static bool IsDepthOnly(Format format)
         {
-            return format == Format.D16Unorm   ||
-                   format == Format.D24X8Unorm ||
-                   format == Format.D32Float;
+            return format == Format.D16Unorm || format == Format.D32Float;
         }
 
         public TextureView BgraSwap(TextureView from)

Ryujinx.Graphics.OpenGL/Image/TextureView.cs

@@ -140,9 +140,11 @@ namespace Ryujinx.Graphics.OpenGL.Image
                 size += Info.GetMipSize(level);
             }
 
+            ReadOnlySpan<byte> data;
+
             if (HwCapabilities.UsePersistentBufferForFlush)
             {
-                return _renderer.PersistentBuffers.Default.GetTextureData(this, size);
+                data = _renderer.PersistentBuffers.Default.GetTextureData(this, size);
             }
             else
             {
@@ -150,8 +152,15 @@ namespace Ryujinx.Graphics.OpenGL.Image
 
                 WriteTo(target);
 
-                return new ReadOnlySpan<byte>(target.ToPointer(), size);
+                data = new ReadOnlySpan<byte>(target.ToPointer(), size);
             }
+
+            if (Format == Format.S8UintD24Unorm)
+            {
+                data = FormatConverter.ConvertD24S8ToS8D24(data);
+            }
+
+            return data;
         }
 
         public unsafe ReadOnlySpan<byte> GetData(int layer, int level)
@@ -285,6 +294,11 @@ namespace Ryujinx.Graphics.OpenGL.Image
 
         public void SetData(ReadOnlySpan<byte> data)
         {
+            if (Format == Format.S8UintD24Unorm)
+            {
+                data = FormatConverter.ConvertS8D24ToD24S8(data);
+            }
+
             unsafe
             {
                 fixed (byte* ptr = data)
@@ -296,6 +310,11 @@ namespace Ryujinx.Graphics.OpenGL.Image
 
         public void SetData(ReadOnlySpan<byte> data, int layer, int level)
         {
+            if (Format == Format.S8UintD24Unorm)
+            {
+                data = FormatConverter.ConvertS8D24ToD24S8(data);
+            }
+
             unsafe
             {
                 fixed (byte* ptr = data)

Ryujinx.HLE/HOS/Services/Nifm/StaticService/IGeneralService.cs

@@ -14,6 +14,9 @@ namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
     {
         private GeneralServiceDetail _generalServiceDetail;
 
+        private IPInterfaceProperties _targetPropertiesCache = null;
+        private UnicastIPAddressInformation _targetAddressInfoCache = null;
+
         public IGeneralService()
         {
             _generalServiceDetail = new GeneralServiceDetail
@@ -22,6 +25,8 @@ namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
                 IsAnyInternetRequestAccepted = true // NOTE: Why not accept any internet request?
             };
 
+            NetworkChange.NetworkAddressChanged += new NetworkAddressChangedEventHandler(LocalInterfaceCacheHandler);
+
             GeneralServiceManager.Add(_generalServiceDetail);
         }
 
@@ -165,6 +170,11 @@ namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
                 return (null, null);
             }
 
+            if (_targetPropertiesCache != null && _targetAddressInfoCache != null)
+            {
+                return (_targetPropertiesCache, _targetAddressInfoCache);
+            }
+
             IPInterfaceProperties       targetProperties  = null;
             UnicastIPAddressInformation targetAddressInfo = null;
 
@@ -194,13 +204,26 @@ namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
                 }
             }
 
+            _targetPropertiesCache  = targetProperties;
+            _targetAddressInfoCache = targetAddressInfo;
+
             return (targetProperties, targetAddressInfo);
         }
 
+        private void LocalInterfaceCacheHandler(object sender, EventArgs e)
+        {
+            Logger.Info?.Print(LogClass.ServiceNifm, $"NetworkAddress changed, invalidating cached data.");
+
+            _targetPropertiesCache  = null;
+            _targetAddressInfoCache = null;
+        }
+
         protected override void Dispose(bool isDisposing)
         {
             if (isDisposing)
             {
+                NetworkChange.NetworkAddressChanged -= LocalInterfaceCacheHandler;
+
                 GeneralServiceManager.Remove(_generalServiceDetail.ClientId);
             }
         }

Ryujinx.HLE/HOS/Services/Nim/Ntc/IStaticService.cs

@@ -1,8 +1,24 @@
-namespace Ryujinx.HLE.HOS.Services.Nim.Ntc
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Services.Nim.Ntc.StaticService;
+
+namespace Ryujinx.HLE.HOS.Services.Nim.Ntc
 {
     [Service("ntc")]
     class IStaticService : IpcService
     {
         public IStaticService(ServiceCtx context) { }
+
+        [CommandHipc(0)]
+        // OpenEnsureNetworkClockAvailabilityService(u64) -> object<nn::ntc::detail::service::IEnsureNetworkClockAvailabilityService>
+        public ResultCode CreateAsyncInterface(ServiceCtx context)
+        {
+            ulong unknown = context.RequestData.ReadUInt64();
+
+            MakeObject(context, new IEnsureNetworkClockAvailabilityService(context));
+
+            Logger.Stub?.PrintStub(LogClass.ServiceNtc, new { unknown });
+
+            return ResultCode.Success;
+        }
     }
 }

Ryujinx.HLE/HOS/Services/Nim/Ntc/StaticService/IEnsureNetworkClockAvailabilityService.cs

@@ -0,0 +1,77 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Ipc;
+using Ryujinx.HLE.HOS.Kernel.Common;
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Nim.Ntc.StaticService
+{
+    class IEnsureNetworkClockAvailabilityService : IpcService 
+    {
+        private KEvent     _finishNotificationEvent;
+        private ResultCode _taskResultCode;
+
+        public IEnsureNetworkClockAvailabilityService(ServiceCtx context)
+        {
+            _finishNotificationEvent = new KEvent(context.Device.System.KernelContext);
+            _taskResultCode          = ResultCode.Success;
+
+            // NOTE: The service starts a thread that polls Nintendo NTP server and syncs the time with it.
+            //       Additionnally it gets and uses some settings too:
+            //       autonomic_correction_interval_seconds, autonomic_correction_failed_retry_interval_seconds,
+            //       autonomic_correction_immediate_try_count_max, autonomic_correction_immediate_try_interval_milliseconds
+        }
+
+        [CommandHipc(0)]
+        // StartTask()
+        public ResultCode StartTask(ServiceCtx context)
+        {
+            if (!context.Device.Configuration.EnableInternetAccess)
+            {
+                return (ResultCode)Time.ResultCode.NetworkTimeNotAvailable;
+            }
+
+            // NOTE: Since we don't support the Nintendo NTP server, we can signal the event now to confirm the update task is done.
+            _finishNotificationEvent.ReadableEvent.Signal();
+
+            Logger.Stub?.PrintStub(LogClass.ServiceNtc);
+
+            return ResultCode.Success;
+        }
+
+        [CommandHipc(1)]
+        // GetFinishNotificationEvent() -> handle<copy>
+        public ResultCode GetFinishNotificationEvent(ServiceCtx context)
+        {
+            if (context.Process.HandleTable.GenerateHandle(_finishNotificationEvent.ReadableEvent, out int finishNotificationEventHandle) != KernelResult.Success)
+            {
+                throw new InvalidOperationException("Out of handles!");
+            }
+
+            context.Response.HandleDesc = IpcHandleDesc.MakeCopy(finishNotificationEventHandle);
+
+            return ResultCode.Success;
+        }
+
+        [CommandHipc(2)]
+        // GetResult()
+        public ResultCode GetResult(ServiceCtx context)
+        {
+            return _taskResultCode;
+        }
+
+        [CommandHipc(3)]
+        // Cancel()
+        public ResultCode Cancel(ServiceCtx context)
+        {
+            // NOTE: The update task should be canceled here.
+            _finishNotificationEvent.ReadableEvent.Signal();
+
+            _taskResultCode = (ResultCode)Time.ResultCode.NetworkTimeTaskCanceled;
+
+            Logger.Stub?.PrintStub(LogClass.ServiceNtc);
+
+            return ResultCode.Success;
+        }
+    }
+}

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

@@ -7,16 +7,18 @@
 
         Success = 0,
 
-        TimeServiceNotInitialized = (0   << ErrorCodeShift) | ModuleId,
-        PermissionDenied          = (1   << ErrorCodeShift) | ModuleId,
-        TimeMismatch              = (102 << ErrorCodeShift) | ModuleId,
-        UninitializedClock        = (103 << ErrorCodeShift) | ModuleId,
-        TimeNotFound              = (200 << ErrorCodeShift) | ModuleId,
-        Overflow                  = (201 << ErrorCodeShift) | ModuleId,
-        LocationNameTooLong       = (801 << ErrorCodeShift) | ModuleId,
-        OutOfRange                = (902 << ErrorCodeShift) | ModuleId,
-        TimeZoneConversionFailed  = (903 << ErrorCodeShift) | ModuleId,
-        TimeZoneNotFound          = (989 << ErrorCodeShift) | ModuleId,
-        NotImplemented            = (990 << ErrorCodeShift) | ModuleId,
+        TimeServiceNotInitialized = (0    << ErrorCodeShift) | ModuleId,
+        PermissionDenied          = (1    << ErrorCodeShift) | ModuleId,
+        TimeMismatch              = (102  << ErrorCodeShift) | ModuleId,
+        UninitializedClock        = (103  << ErrorCodeShift) | ModuleId,
+        TimeNotFound              = (200  << ErrorCodeShift) | ModuleId,
+        Overflow                  = (201  << ErrorCodeShift) | ModuleId,
+        LocationNameTooLong       = (801  << ErrorCodeShift) | ModuleId,
+        OutOfRange                = (902  << ErrorCodeShift) | ModuleId,
+        TimeZoneConversionFailed  = (903  << ErrorCodeShift) | ModuleId,
+        TimeZoneNotFound          = (989  << ErrorCodeShift) | ModuleId,
+        NotImplemented            = (990  << ErrorCodeShift) | ModuleId,
+        NetworkTimeNotAvailable   = (1000 << ErrorCodeShift) | ModuleId,
+        NetworkTimeTaskCanceled   = (1003 << ErrorCodeShift) | ModuleId,
     }
 }