IPC refactor part 3+4: New server HIPC message processor (#4188)

* IPC refactor part 3 + 4: New server HIPC message processor with source generator based serialization

* Make types match on calls to AlignUp/AlignDown

* Formatting

* Address some PR feedback

* Move BitfieldExtensions to Ryujinx.Common.Utilities and consolidate implementations

* Rename Reader/Writer to SpanReader/SpanWriter and move to Ryujinx.Common.Memory

* Implement EventType

* Address more PR feedback

* Log request processing errors since they are not normal

* Rename waitable to multiwait and add missing lock

* PR feedback

* Ac_K PR feedback

Ryujinx.Horizon/Sdk/Sm/SmApi.cs

@@ -0,0 +1,107 @@
+using Ryujinx.Common.Memory;
+using Ryujinx.Horizon.Common;
+using Ryujinx.Horizon.Sdk.Sf.Cmif;
+using System;
+
+namespace Ryujinx.Horizon.Sdk.Sm
+{
+    class SmApi
+    {
+        private int _portHandle;
+
+        public Result Initialize()
+        {
+            Result result = HorizonStatic.Syscall.ConnectToNamedPort(out int portHandle, "sm:");
+
+            while (result == KernelResult.NotFound)
+            {
+                HorizonStatic.Syscall.SleepThread(50000000L);
+                result = HorizonStatic.Syscall.ConnectToNamedPort(out portHandle, "sm:");
+            }
+
+            if (result.IsFailure)
+            {
+                return result;
+            }
+
+            _portHandle = portHandle;
+
+            return RegisterClient();
+        }
+
+        private Result RegisterClient()
+        {
+            Span<byte> data = stackalloc byte[8];
+
+            SpanWriter writer = new SpanWriter(data);
+
+            writer.Write(0UL);
+
+            return ServiceUtil.SendRequest(out _, _portHandle, 0, sendPid: true, data);
+        }
+
+        public Result GetServiceHandle(out int handle, ServiceName name)
+        {
+            Span<byte> data = stackalloc byte[8];
+
+            SpanWriter writer = new SpanWriter(data);
+
+            writer.Write(name);
+
+            Result result = ServiceUtil.SendRequest(out CmifResponse response, _portHandle, 1, sendPid: false, data);
+
+            if (result.IsFailure)
+            {
+                handle = 0;
+                return result;
+            }
+
+            handle = response.MoveHandles[0];
+            return Result.Success;
+        }
+
+        public Result RegisterService(out int handle, ServiceName name, int maxSessions, bool isLight)
+        {
+            Span<byte> data = stackalloc byte[16];
+
+            SpanWriter writer = new SpanWriter(data);
+
+            writer.Write(name);
+            writer.Write(isLight ? 1 : 0);
+            writer.Write(maxSessions);
+
+            Result result = ServiceUtil.SendRequest(out CmifResponse response, _portHandle, 2, sendPid: false, data);
+
+            if (result.IsFailure)
+            {
+                handle = 0;
+                return result;
+            }
+
+            handle = response.MoveHandles[0];
+            return Result.Success;
+        }
+
+        public Result UnregisterService(ServiceName name)
+        {
+            Span<byte> data = stackalloc byte[8];
+
+            SpanWriter writer = new SpanWriter(data);
+
+            writer.Write(name);
+
+            return ServiceUtil.SendRequest(out _, _portHandle, 3, sendPid: false, data);
+        }
+
+        public Result DetachClient()
+        {
+            Span<byte> data = stackalloc byte[8];
+
+            SpanWriter writer = new SpanWriter(data);
+
+            writer.Write(0UL);
+
+            return ServiceUtil.SendRequest(out _, _portHandle, 4, sendPid: true, data);
+        }
+    }
+}