Accurately implement steady & system clocks (#732)

* Improve SteadyClock implementation accuracy

* Rewrite system clocks to be accurate

* Implement IStaticService 100 & 101

* Add time:* permissions

* Address comments

* Realign TimePermissions definitions

* Address gdk's comments

* Fix after rebase

1 files changed, 59 insertions, 49 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Time/ISystemClock.cs b/Ryujinx.HLE/HOS/Services/Time/ISystemClock.cs
index 0ed34d17..ddd67a42 100644
--- a/Ryujinx.HLE/HOS/Services/Time/ISystemClock.cs
+++ b/Ryujinx.HLE/HOS/Services/Time/ISystemClock.cs
@@ -1,97 +1,107 @@
-using System;
+using Ryujinx.Common;
+using Ryujinx.HLE.HOS.Services.Time.Clock;
 
 namespace Ryujinx.HLE.HOS.Services.Time
 {
     class ISystemClock : IpcService
     {
-        private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+        private SystemClockCore _clockCore;
+        private bool            _writePermission;
 
-        private SystemClockType _clockType;
-        private DateTime        _systemClockContextEpoch;
-        private long            _systemClockTimePoint;
-        private byte[]          _systemClockContextEnding;
-        private long            _timeOffset;
-
-        public ISystemClock(SystemClockType clockType)
+        public ISystemClock(SystemClockCore clockCore, bool writePermission)
         {
-            _clockType                = clockType;
-            _systemClockContextEpoch  = System.Diagnostics.Process.GetCurrentProcess().StartTime;
-            _systemClockContextEnding = new byte[0x10];
-            _timeOffset               = 0;
-
-            if (clockType == SystemClockType.User ||
-                clockType == SystemClockType.Network)
-            {
-                _systemClockContextEpoch = _systemClockContextEpoch.ToUniversalTime();
-            }
-
-            _systemClockTimePoint = (long)(_systemClockContextEpoch - Epoch).TotalSeconds;
+            _clockCore       = clockCore;
+            _writePermission = writePermission;
         }
 
         [Command(0)]
         // GetCurrentTime() -> nn::time::PosixTime
         public ResultCode GetCurrentTime(ServiceCtx context)
         {
-            DateTime currentTime = DateTime.Now;
+            SteadyClockCore      steadyClockCore  = _clockCore.GetSteadyClockCore();
+            SteadyClockTimePoint currentTimePoint = steadyClockCore.GetCurrentTimePoint(context.Thread);
+
+            ResultCode result = _clockCore.GetSystemClockContext(context.Thread, out SystemClockContext clockContext);
 
-            if (_clockType == SystemClockType.User ||
-                _clockType == SystemClockType.Network)
+            if (result == ResultCode.Success)
             {
-                currentTime = currentTime.ToUniversalTime();
-            }
+                result = ResultCode.TimeMismatch;
+
+                if (currentTimePoint.ClockSourceId == clockContext.SteadyTimePoint.ClockSourceId)
+                {
+                    ulong posixTime = clockContext.Offset + currentTimePoint.TimePoint;
+
+                    context.ResponseData.Write(posixTime);
 
-            context.ResponseData.Write((long)((currentTime - Epoch).TotalSeconds) + _timeOffset);
+                    result = 0;
+                }
+            }
 
-            return ResultCode.Success;
+            return result;
         }
 
         [Command(1)]
         // SetCurrentTime(nn::time::PosixTime)
         public ResultCode SetCurrentTime(ServiceCtx context)
         {
-            DateTime currentTime = DateTime.Now;
-
-            if (_clockType == SystemClockType.User ||
-                _clockType == SystemClockType.Network)
+            if (!_writePermission)
             {
-                currentTime = currentTime.ToUniversalTime();
+                return ResultCode.PermissionDenied;
             }
 
-            _timeOffset = (context.RequestData.ReadInt64() - (long)(currentTime - Epoch).TotalSeconds);
+            ulong                posixTime        = context.RequestData.ReadUInt64();
+            SteadyClockCore      steadyClockCore  = _clockCore.GetSteadyClockCore();
+            SteadyClockTimePoint currentTimePoint = steadyClockCore.GetCurrentTimePoint(context.Thread);
+
+            SystemClockContext clockContext = new SystemClockContext()
+            {
+                Offset          = posixTime - currentTimePoint.TimePoint,
+                SteadyTimePoint = currentTimePoint
+            };
+
+            ResultCode result = _clockCore.SetSystemClockContext(clockContext);
+
+            if (result == ResultCode.Success)
+            {
+                result = _clockCore.Flush(clockContext);
+            }
 
-            return ResultCode.Success;
+            return result;
         }
 
         [Command(2)]
         // GetSystemClockContext() -> nn::time::SystemClockContext
         public ResultCode GetSystemClockContext(ServiceCtx context)
         {
-            context.ResponseData.Write((long)(_systemClockContextEpoch - Epoch).TotalSeconds);
-
-            // The point in time, TODO: is there a link between epoch and this?
-            context.ResponseData.Write(_systemClockTimePoint);
+            ResultCode result = _clockCore.GetSystemClockContext(context.Thread, out SystemClockContext clockContext);
 
-            // This seems to be some kind of identifier?
-            for (int i = 0; i < 0x10; i++)
+            if (result == ResultCode.Success)
             {
-                context.ResponseData.Write(_systemClockContextEnding[i]);
+                context.ResponseData.WriteStruct(clockContext);
             }
 
-            return ResultCode.Success;
+            return result;
         }
 
         [Command(3)]
         // SetSystemClockContext(nn::time::SystemClockContext)
         public ResultCode SetSystemClockContext(ServiceCtx context)
         {
-            long newSystemClockEpoch     = context.RequestData.ReadInt64();
-            long newSystemClockTimePoint = context.RequestData.ReadInt64();
+            if (!_writePermission)
+            {
+                return ResultCode.PermissionDenied;
+            }
+
+            SystemClockContext clockContext = context.RequestData.ReadStruct<SystemClockContext>();
 
-            _systemClockContextEpoch     = Epoch.Add(TimeSpan.FromSeconds(newSystemClockEpoch));
-            _systemClockTimePoint        = newSystemClockTimePoint;
-            _systemClockContextEnding    = context.RequestData.ReadBytes(0x10);
+            ResultCode result = _clockCore.SetSystemClockContext(clockContext);
+
+            if (result == ResultCode.Success)
+            {
+                result = _clockCore.Flush(clockContext);
+            }
 
-            return ResultCode.Success;
+            return result;
         }
     }
 }
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