Code style fixes and nits on the HLE project (#355)

* Some style fixes and nits on ITimeZoneService

* Remove some unneeded usings

* Remove the Ryujinx.HLE.OsHle.Handles namespace

* Remove hbmenu automatic load on process exit

* Rename Ns to Device, rename Os to System, rename SystemState to State

* Move Exceptions and Utilities out of OsHle

* Rename OsHle to HOS

* Rename OsHle folder to HOS

* IManagerDisplayService and ISystemDisplayService style fixes

* BsdError shouldn't be public

* Add a empty new line before using static

* Remove unused file

* Some style fixes on NPDM

* Exit gracefully when the application is closed

* Code style fixes on IGeneralService

* Add 0x prefix on values printed as hex

* Small improvements on finalization code

* Move ProcessId and ThreadId out of AThreadState

* Rename VFs to FileSystem

* FsAccessHeader shouldn't be public. Also fix file names casing

* More case changes on NPDM

* Remove unused files

* Move using to the correct place on NPDM

* Use properties on KernelAccessControlMmio

* Address PR feedback

9 files changed, 543 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Ipc/IpcBuffDesc.cs b/Ryujinx.HLE/HOS/Ipc/IpcBuffDesc.cs
new file mode 100644
index 00000000..346d696e
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcBuffDesc.cs
@@ -0,0 +1,27 @@
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    struct IpcBuffDesc
+    {
+        public long Position { get; private set; }
+        public long Size     { get; private set; }
+        public int  Flags    { get; private set; }
+
+        public IpcBuffDesc(BinaryReader Reader)
+        {
+            long Word0 = Reader.ReadUInt32();
+            long Word1 = Reader.ReadUInt32();
+            long Word2 = Reader.ReadUInt32();
+
+            Position  =  Word1;
+            Position |= (Word2 <<  4) & 0x0f00000000;
+            Position |= (Word2 << 34) & 0x7000000000;
+
+            Size  =  Word0;
+            Size |= (Word2 << 8) & 0xf00000000;
+
+            Flags = (int)Word2 & 3;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Ipc/IpcHandleDesc.cs b/Ryujinx.HLE/HOS/Ipc/IpcHandleDesc.cs
new file mode 100644
index 00000000..081b5695
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcHandleDesc.cs
@@ -0,0 +1,92 @@
+using System;
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    class IpcHandleDesc
+    {
+        public bool HasPId { get; private set; }
+
+        public long PId { get; private set; }
+
+        public int[] ToCopy { get; private set; }
+        public int[] ToMove { get; private set; }
+
+        public IpcHandleDesc(BinaryReader Reader)
+        {
+            int Word = Reader.ReadInt32();
+
+            HasPId = (Word & 1) != 0;
+
+            ToCopy = new int[(Word >> 1) & 0xf];
+            ToMove = new int[(Word >> 5) & 0xf];
+
+            PId = HasPId ? Reader.ReadInt64() : 0;
+
+            for (int Index = 0; Index < ToCopy.Length; Index++)
+            {
+                ToCopy[Index] = Reader.ReadInt32();
+            }
+
+            for (int Index = 0; Index < ToMove.Length; Index++)
+            {
+                ToMove[Index] = Reader.ReadInt32();
+            }
+        }
+
+        public IpcHandleDesc(int[] Copy, int[] Move)
+        {
+            ToCopy = Copy ?? throw new ArgumentNullException(nameof(Copy));
+            ToMove = Move ?? throw new ArgumentNullException(nameof(Move));
+        }
+
+        public IpcHandleDesc(int[] Copy, int[] Move, long PId) : this(Copy, Move)
+        {
+            this.PId = PId;
+
+            HasPId = true;
+        }
+
+        public static IpcHandleDesc MakeCopy(params int[] Handles)
+        {
+            return new IpcHandleDesc(Handles, new int[0]);
+        }
+
+        public static IpcHandleDesc MakeMove(params int[] Handles)
+        {
+            return new IpcHandleDesc(new int[0], Handles);
+        }
+
+        public byte[] GetBytes()
+        {
+            using (MemoryStream MS = new MemoryStream())
+            {
+                BinaryWriter Writer = new BinaryWriter(MS);
+
+                int Word = HasPId ? 1 : 0;
+
+                Word |= (ToCopy.Length & 0xf) << 1;
+                Word |= (ToMove.Length & 0xf) << 5;
+
+                Writer.Write(Word);
+
+                if (HasPId)
+                {
+                    Writer.Write((long)PId);
+                }
+
+                foreach (int Handle in ToCopy)
+                {
+                    Writer.Write(Handle);
+                }
+
+                foreach (int Handle in ToMove)
+                {
+                    Writer.Write(Handle);
+                }
+
+                return MS.ToArray();
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Ipc/IpcHandler.cs b/Ryujinx.HLE/HOS/Ipc/IpcHandler.cs
new file mode 100644
index 00000000..08a4cdb5
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcHandler.cs
@@ -0,0 +1,140 @@
+using ChocolArm64.Memory;
+using Ryujinx.HLE.HOS.Kernel;
+using System;
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    static class IpcHandler
+    {
+        public static long IpcCall(
+            Switch     Ns,
+            Process    Process,
+            AMemory    Memory,
+            KSession   Session,
+            IpcMessage Request,
+            long       CmdPtr)
+        {
+            IpcMessage Response = new IpcMessage();
+
+            using (MemoryStream Raw = new MemoryStream(Request.RawData))
+            {
+                BinaryReader ReqReader = new BinaryReader(Raw);
+
+                if (Request.Type == IpcMessageType.Request ||
+                    Request.Type == IpcMessageType.RequestWithContext)
+                {
+                    Response.Type = IpcMessageType.Response;
+
+                    using (MemoryStream ResMS = new MemoryStream())
+                    {
+                        BinaryWriter ResWriter = new BinaryWriter(ResMS);
+
+                        ServiceCtx Context = new ServiceCtx(
+                            Ns,
+                            Process,
+                            Memory,
+                            Session,
+                            Request,
+                            Response,
+                            ReqReader,
+                            ResWriter);
+
+                        Session.Service.CallMethod(Context);
+
+                        Response.RawData = ResMS.ToArray();
+                    }
+                }
+                else if (Request.Type == IpcMessageType.Control ||
+                         Request.Type == IpcMessageType.ControlWithContext)
+                {
+                    long Magic = ReqReader.ReadInt64();
+                    long CmdId = ReqReader.ReadInt64();
+
+                    switch (CmdId)
+                    {
+                        case 0:
+                        {
+                            Request = FillResponse(Response, 0, Session.Service.ConvertToDomain());
+
+                            break;
+                        }
+
+                        case 3:
+                        {
+                            Request = FillResponse(Response, 0, 0x500);
+
+                            break;
+                        }
+
+                        //TODO: Whats the difference between IpcDuplicateSession/Ex?
+                        case 2:
+                        case 4:
+                        {
+                            int Unknown = ReqReader.ReadInt32();
+
+                            int Handle = Process.HandleTable.OpenHandle(Session);
+
+                            Response.HandleDesc = IpcHandleDesc.MakeMove(Handle);
+
+                            Request = FillResponse(Response, 0);
+
+                            break;
+                        }
+
+                        default: throw new NotImplementedException(CmdId.ToString());
+                    }
+                }
+                else if (Request.Type == IpcMessageType.CloseSession)
+                {
+                    //TODO
+                }
+                else
+                {
+                    throw new NotImplementedException(Request.Type.ToString());
+                }
+
+                Memory.WriteBytes(CmdPtr, Response.GetBytes(CmdPtr));
+            }
+
+            return 0;
+        }
+
+        private static IpcMessage FillResponse(IpcMessage Response, long Result, params int[] Values)
+        {
+            using (MemoryStream MS = new MemoryStream())
+            {
+                BinaryWriter Writer = new BinaryWriter(MS);
+
+                foreach (int Value in Values)
+                {
+                    Writer.Write(Value);
+                }
+
+                return FillResponse(Response, Result, MS.ToArray());
+            }
+        }
+
+        private static IpcMessage FillResponse(IpcMessage Response, long Result, byte[] Data = null)
+        {
+            Response.Type = IpcMessageType.Response;
+
+            using (MemoryStream MS = new MemoryStream())
+            {
+                BinaryWriter Writer = new BinaryWriter(MS);
+
+                Writer.Write(IpcMagic.Sfco);
+                Writer.Write(Result);
+
+                if (Data != null)
+                {
+                    Writer.Write(Data);
+                }
+
+                Response.RawData = MS.ToArray();
+            }
+
+            return Response;
+        }
+    }
+}
diff --git a/Ryujinx.HLE/HOS/Ipc/IpcMagic.cs b/Ryujinx.HLE/HOS/Ipc/IpcMagic.cs
new file mode 100644
index 00000000..72770b90
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcMagic.cs
@@ -0,0 +1,8 @@
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    abstract class IpcMagic
+    {
+        public const long Sfci = 'S' << 0 | 'F' << 8 | 'C' << 16 | 'I' << 24;
+        public const long Sfco = 'S' << 0 | 'F' << 8 | 'C' << 16 | 'O' << 24;
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Ipc/IpcMessage.cs b/Ryujinx.HLE/HOS/Ipc/IpcMessage.cs
new file mode 100644
index 00000000..c8153fdb
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcMessage.cs
@@ -0,0 +1,215 @@
+using System.Collections.Generic;
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    class IpcMessage
+    {
+        public IpcMessageType Type { get; set; }
+
+        public IpcHandleDesc HandleDesc { get; set; }
+
+        public List<IpcPtrBuffDesc>      PtrBuff      { get; private set; }
+        public List<IpcBuffDesc>         SendBuff     { get; private set; }
+        public List<IpcBuffDesc>         ReceiveBuff  { get; private set; }
+        public List<IpcBuffDesc>         ExchangeBuff { get; private set; }
+        public List<IpcRecvListBuffDesc> RecvListBuff { get; private set; }
+
+        public List<int> ObjectIds { get; private set; }
+
+        public byte[] RawData { get; set; }
+
+        public IpcMessage()
+        {
+            PtrBuff      = new List<IpcPtrBuffDesc>();
+            SendBuff     = new List<IpcBuffDesc>();
+            ReceiveBuff  = new List<IpcBuffDesc>();
+            ExchangeBuff = new List<IpcBuffDesc>();
+            RecvListBuff = new List<IpcRecvListBuffDesc>();
+
+            ObjectIds = new List<int>();
+        }
+
+        public IpcMessage(byte[] Data, long CmdPtr) : this()
+        {
+            using (MemoryStream MS = new MemoryStream(Data))
+            {
+                BinaryReader Reader = new BinaryReader(MS);
+
+                Initialize(Reader, CmdPtr);
+            }
+        }
+
+        private void Initialize(BinaryReader Reader, long CmdPtr)
+        {
+            int Word0 = Reader.ReadInt32();
+            int Word1 = Reader.ReadInt32();
+
+            Type = (IpcMessageType)(Word0 & 0xffff);
+
+            int  PtrBuffCount  = (Word0 >> 16) & 0xf;
+            int  SendBuffCount = (Word0 >> 20) & 0xf;
+            int  RecvBuffCount = (Word0 >> 24) & 0xf;
+            int  XchgBuffCount = (Word0 >> 28) & 0xf;
+
+            int  RawDataSize   =  (Word1 >>  0) & 0x3ff;
+            int  RecvListFlags =  (Word1 >> 10) & 0xf;
+            bool HndDescEnable = ((Word1 >> 31) & 0x1) != 0;
+
+            if (HndDescEnable)
+            {
+                HandleDesc = new IpcHandleDesc(Reader);
+            }
+
+            for (int Index = 0; Index < PtrBuffCount; Index++)
+            {
+                PtrBuff.Add(new IpcPtrBuffDesc(Reader));
+            }
+
+            void ReadBuff(List<IpcBuffDesc> Buff, int Count)
+            {
+                for (int Index = 0; Index < Count; Index++)
+                {
+                    Buff.Add(new IpcBuffDesc(Reader));
+                }
+            }
+
+            ReadBuff(SendBuff,     SendBuffCount);
+            ReadBuff(ReceiveBuff,  RecvBuffCount);
+            ReadBuff(ExchangeBuff, XchgBuffCount);
+
+            RawDataSize *= 4;
+
+            long RecvListPos = Reader.BaseStream.Position + RawDataSize;
+
+            long Pad0 = GetPadSize16(Reader.BaseStream.Position + CmdPtr);
+
+            Reader.BaseStream.Seek(Pad0, SeekOrigin.Current);
+
+            int RecvListCount = RecvListFlags - 2;
+
+            if (RecvListCount == 0)
+            {
+                RecvListCount = 1;
+            }
+            else if (RecvListCount < 0)
+            {
+                RecvListCount = 0;
+            }
+
+            RawData = Reader.ReadBytes(RawDataSize);
+
+            Reader.BaseStream.Seek(RecvListPos, SeekOrigin.Begin);
+
+            for (int Index = 0; Index < RecvListCount; Index++)
+            {
+                RecvListBuff.Add(new IpcRecvListBuffDesc(Reader));
+            }
+        }
+
+        public byte[] GetBytes(long CmdPtr)
+        {
+            using (MemoryStream MS = new MemoryStream())
+            {
+                BinaryWriter Writer = new BinaryWriter(MS);
+
+                int Word0;
+                int Word1;
+
+                Word0  = (int)Type;
+                Word0 |= (PtrBuff.Count      & 0xf) << 16;
+                Word0 |= (SendBuff.Count     & 0xf) << 20;
+                Word0 |= (ReceiveBuff.Count  & 0xf) << 24;
+                Word0 |= (ExchangeBuff.Count & 0xf) << 28;
+
+                byte[] HandleData = new byte[0];
+
+                if (HandleDesc != null)
+                {
+                    HandleData = HandleDesc.GetBytes();
+                }
+
+                int DataLength = RawData?.Length ?? 0;
+
+                int Pad0 = (int)GetPadSize16(CmdPtr + 8 + HandleData.Length);
+
+                //Apparently, padding after Raw Data is 16 bytes, however when there is
+                //padding before Raw Data too, we need to subtract the size of this padding.
+                //This is the weirdest padding I've seen so far...
+                int Pad1 = 0x10 - Pad0;
+
+                DataLength = (DataLength + Pad0 + Pad1) / 4;
+
+                Word1 = DataLength & 0x3ff;
+
+                if (HandleDesc != null)
+                {
+                    Word1 |= 1 << 31;
+                }
+
+                Writer.Write(Word0);
+                Writer.Write(Word1);
+                Writer.Write(HandleData);
+
+                MS.Seek(Pad0, SeekOrigin.Current);
+
+                if (RawData != null)
+                {
+                    Writer.Write(RawData);
+                }
+
+                Writer.Write(new byte[Pad1]);
+
+                return MS.ToArray();
+            }
+        }
+
+        private long GetPadSize16(long Position)
+        {
+            if ((Position & 0xf) != 0)
+            {
+                return 0x10 - (Position & 0xf);
+            }
+
+            return 0;
+        }
+
+        public (long Position, long Size) GetBufferType0x21()
+        {
+            if (PtrBuff.Count       != 0 &&
+                PtrBuff[0].Position != 0 &&
+                PtrBuff[0].Size     != 0)
+            {
+                return (PtrBuff[0].Position, PtrBuff[0].Size);
+            }
+
+            if (SendBuff.Count       != 0 &&
+                SendBuff[0].Position != 0 &&
+                SendBuff[0].Size     != 0)
+            {
+                return (SendBuff[0].Position, SendBuff[0].Size);
+            }
+
+            return (0, 0);
+        }
+
+        public (long Position, long Size) GetBufferType0x22()
+        {
+            if (RecvListBuff.Count       != 0 &&
+                RecvListBuff[0].Position != 0 &&
+                RecvListBuff[0].Size     != 0)
+            {
+                return (RecvListBuff[0].Position, RecvListBuff[0].Size);
+            }
+
+            if (ReceiveBuff.Count       != 0 &&
+                ReceiveBuff[0].Position != 0 &&
+                ReceiveBuff[0].Size     != 0)
+            {
+                return (ReceiveBuff[0].Position, ReceiveBuff[0].Size);
+            }
+
+            return (0, 0);
+        }
+    }
+}
diff --git a/Ryujinx.HLE/HOS/Ipc/IpcMessageType.cs b/Ryujinx.HLE/HOS/Ipc/IpcMessageType.cs
new file mode 100644
index 00000000..e258accc
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcMessageType.cs
@@ -0,0 +1,12 @@
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    enum IpcMessageType
+    {
+        Response           = 0,
+        CloseSession       = 2,
+        Request            = 4,
+        Control            = 5,
+        RequestWithContext = 6,
+        ControlWithContext = 7
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Ipc/IpcPtrBuffDesc.cs b/Ryujinx.HLE/HOS/Ipc/IpcPtrBuffDesc.cs
new file mode 100644
index 00000000..21f5d3bc
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcPtrBuffDesc.cs
@@ -0,0 +1,26 @@
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    struct IpcPtrBuffDesc
+    {
+        public long  Position { get; private set; }
+        public int   Index    { get; private set; }
+        public long  Size     { get; private set; }
+
+        public IpcPtrBuffDesc(BinaryReader Reader)
+        {
+            long Word0 = Reader.ReadUInt32();
+            long Word1 = Reader.ReadUInt32();
+
+            Position  =  Word1;
+            Position |= (Word0 << 20) & 0x0f00000000;
+            Position |= (Word0 << 30) & 0x7000000000;
+
+            Index  = ((int)Word0 >> 0) & 0x03f;
+            Index |= ((int)Word0 >> 3) & 0x1c0;
+
+            Size = (ushort)(Word0 >> 16);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Ipc/IpcRecvListBuffDesc.cs b/Ryujinx.HLE/HOS/Ipc/IpcRecvListBuffDesc.cs
new file mode 100644
index 00000000..1d0a8c80
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/IpcRecvListBuffDesc.cs
@@ -0,0 +1,19 @@
+using System.IO;
+
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    struct IpcRecvListBuffDesc
+    {
+        public long Position { get; private set; }
+        public long Size     { get; private set; }
+
+        public IpcRecvListBuffDesc(BinaryReader Reader)
+        {
+            long Value = Reader.ReadInt64();
+
+            Position = Value & 0xffffffffffff;
+
+            Size = (ushort)(Value >> 48);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/Ipc/ServiceProcessRequest.cs b/Ryujinx.HLE/HOS/Ipc/ServiceProcessRequest.cs
new file mode 100644
index 00000000..da4a7e75
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Ipc/ServiceProcessRequest.cs
@@ -0,0 +1,4 @@
+namespace Ryujinx.HLE.HOS.Ipc
+{
+    delegate long ServiceProcessRequest(ServiceCtx Context);
+}
\ No newline at end of file