2 files changed, 156 insertions, 0 deletions
diff --git a/Ryujinx.Horizon/LogManager/Ipc/LmLogger.cs b/Ryujinx.Horizon/LogManager/Ipc/LmLogger.cs
new file mode 100644
index 00000000..002a5982
--- /dev/null
+++ b/Ryujinx.Horizon/LogManager/Ipc/LmLogger.cs
@@ -0,0 +1,136 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.Common.Memory;
+using Ryujinx.Horizon.Common;
+using Ryujinx.Horizon.Sdk.Lm;
+using Ryujinx.Horizon.Sdk.Sf;
+using Ryujinx.Horizon.Sdk.Sf.Hipc;
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace Ryujinx.Horizon.LogManager.Ipc
+{
+    partial class LmLogger : ILmLogger
+    {
+        private readonly LogService _log;
+        private readonly ulong      _pid;
+
+        public LmLogger(LogService log, ulong pid)
+        {
+            _log = log;
+            _pid = pid;
+        }
+
+        [CmifCommand(0)]
+        public Result Log([Buffer(HipcBufferFlags.In | HipcBufferFlags.AutoSelect)] Span<byte> message)
+        {
+            if (!SetProcessId(message, _pid))
+            {
+                return Result.Success;
+            }
+
+            Logger.Guest?.Print(LogClass.ServiceLm, LogImpl(message));
+
+            return Result.Success;
+        }
+
+        [CmifCommand(1)] // 3.0.0+
+        public Result SetDestination(LogDestination destination)
+        {
+            _log.LogDestination = destination;
+
+            return Result.Success;
+        }
+
+        private static bool SetProcessId(Span<byte> message, ulong processId)
+        {
+            ref LogPacketHeader header = ref MemoryMarshal.Cast<byte, LogPacketHeader>(message)[0];
+
+            uint expectedMessageSize = (uint)Unsafe.SizeOf<LogPacketHeader>() + header.PayloadSize;
+            if (expectedMessageSize != (uint)message.Length)
+            {
+                Logger.Warning?.Print(LogClass.ServiceLm, $"Invalid message size (expected 0x{expectedMessageSize:X} but got 0x{message.Length:X}).");
+
+                return false;
+            }
+
+            header.ProcessId = processId;
+
+            return true;
+        }
+
+        private static string LogImpl(ReadOnlySpan<byte> message)
+        {
+            SpanReader      reader  = new(message);
+            LogPacketHeader header  = reader.Read<LogPacketHeader>();
+            StringBuilder   builder = new();
+
+            builder.AppendLine($"Guest Log:\n  Log level: {header.Severity}");
+
+            while (reader.Length > 0)
+            {
+                int type = ReadUleb128(ref reader);
+                int size = ReadUleb128(ref reader);
+
+                LogDataChunkKey field = (LogDataChunkKey)type;
+
+                string fieldStr;
+
+                if (field == LogDataChunkKey.Start)
+                {
+                    reader.Skip(size);
+
+                    continue;
+                }
+                else if (field == LogDataChunkKey.Stop)
+                {
+                    break;
+                }
+                else if (field == LogDataChunkKey.Line)
+                {
+                    fieldStr = $"{field}: {reader.Read<int>()}";
+                }
+                else if (field == LogDataChunkKey.DropCount)
+                {
+                    fieldStr = $"{field}: {reader.Read<long>()}";
+                }
+                else if (field == LogDataChunkKey.Time)
+                {
+                    fieldStr = $"{field}: {reader.Read<long>()}s";
+                }
+                else if (field < LogDataChunkKey.Count)
+                {
+                    fieldStr = $"{field}: '{Encoding.UTF8.GetString(reader.GetSpan(size)).TrimEnd()}'";
+                }
+                else
+                {
+                    fieldStr = $"Field{field}: '{Encoding.UTF8.GetString(reader.GetSpan(size)).TrimEnd()}'";
+                }
+
+                builder.AppendLine($"    {fieldStr}");
+            }
+
+            return builder.ToString();
+        }
+
+        private static int ReadUleb128(ref SpanReader reader)
+        {
+            int result = 0;
+            int count  = 0;
+
+            byte encoded;
+
+            do
+            {
+                encoded = reader.Read<byte>();
+
+                result += (encoded & 0x7F) << (7 * count);
+
+                count++;
+            } while ((encoded & 0x80) != 0);
+
+            return result;
+        }
+    }
+}
+\ No newline at end of file
diff --git a/Ryujinx.Horizon/LogManager/Ipc/LogService.cs b/Ryujinx.Horizon/LogManager/Ipc/LogService.cs
new file mode 100644
index 00000000..6899739e
--- /dev/null
+++ b/Ryujinx.Horizon/LogManager/Ipc/LogService.cs
@@ -0,0 +1,20 @@
+using Ryujinx.Horizon.Common;
+using Ryujinx.Horizon.Sdk.Lm;
+using Ryujinx.Horizon.Sdk.Sf;
+
+namespace Ryujinx.Horizon.LogManager.Ipc
+{
+    partial class LogService : ILogService
+    {
+        public LogDestination LogDestination { get; set; } = LogDestination.TargetManager;
+
+        [CmifCommand(0)]
+        public Result OpenLogger(out LmLogger logger, [ClientProcessId] ulong pid)
+        {
+            // NOTE: Internal name is Logger, but we rename it LmLogger to avoid name clash with Ryujinx.Common.Logging logger.
+            logger = new LmLogger(this, pid);
+
+            return Result.Success;
+        }
+    }
+}
+\ No newline at end of file