Implement some calls of ISelfController (#965)

* Implement some calls of ISelfController

This PR implement some calls of ISelfController:

- EnterFatalSection
- LeaveFatalSection
- GetAccumulatedSuspendedTickValue (close #937)

According to RE of the 8.1.0 am service.

* thread safe increment/decrement

* Fix thread safe

* remove unused using

2 files changed, 55 insertions, 6 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/SystemAppletProxy/ISelfController.cs b/Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/SystemAppletProxy/ISelfController.cs
index 62f1beec..d7abfdfe 100644
--- a/Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/SystemAppletProxy/ISelfController.cs
+++ b/Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/SystemAppletProxy/ISelfController.cs
@@ -13,6 +13,12 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.Sys
         private KEvent _accumulatedSuspendedTickChangedEvent;
         private int    _accumulatedSuspendedTickChangedEventHandle = 0;
 
+        private object _fatalSectionLock = new object();
+        private int    _fatalSectionCount;
+
+        // TODO: Set this when the game goes in suspension (go back to home menu ect), we currently don't support that so we can keep it set to 0.
+        private ulong _accumulatedSuspendedTickValue = 0;
+
         private int _idleTimeDetectionExtension;
 
         public ISelfController(Horizon system)
@@ -47,6 +53,39 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.Sys
             return ResultCode.Success;
         }
 
+        [Command(3)] // 2.0.0+
+        // EnterFatalSection()
+        public ResultCode EnterFatalSection(ServiceCtx context)
+        {
+            lock (_fatalSectionLock)
+            {
+                _fatalSectionCount++;
+            }
+
+            return ResultCode.Success;
+        }
+
+        [Command(4)] // 2.0.0+
+        // LeaveFatalSection()
+        public ResultCode LeaveFatalSection(ServiceCtx context)
+        {
+            ResultCode result = ResultCode.Success;
+
+            lock (_fatalSectionLock)
+            {
+                if (_fatalSectionCount != 0)
+                {
+                    _fatalSectionCount--;
+                }
+                else
+                {
+                    result = ResultCode.UnbalancedFatalSection;
+                }
+            }
+
+            return result;
+        }
+
         [Command(9)]
         // GetLibraryAppletLaunchableEvent() -> handle<copy>
         public ResultCode GetLibraryAppletLaunchableEvent(ServiceCtx context)
@@ -176,6 +215,15 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.Sys
             return ResultCode.Success;
         }
 
+        [Command(90)] // 6.0.0+
+        // GetAccumulatedSuspendedTickValue() -> u64
+        public ResultCode GetAccumulatedSuspendedTickValue(ServiceCtx context)
+        {
+            context.ResponseData.Write(_accumulatedSuspendedTickValue);
+
+            return ResultCode.Success;
+        }
+
         [Command(91)] // 6.0.0+
         // GetAccumulatedSuspendedTickChangedEvent() -> handle<copy>
         public ResultCode GetAccumulatedSuspendedTickChangedEvent(ServiceCtx context)
diff --git a/Ryujinx.HLE/HOS/Services/Am/ResultCode.cs b/Ryujinx.HLE/HOS/Services/Am/ResultCode.cs
index 2ff83d7f..a5e27071 100644
--- a/Ryujinx.HLE/HOS/Services/Am/ResultCode.cs
+++ b/Ryujinx.HLE/HOS/Services/Am/ResultCode.cs
@@ -7,11 +7,12 @@ namespace Ryujinx.HLE.HOS.Services.Am
 
         Success = 0,
 
-        NotAvailable      = (2   << ErrorCodeShift) | ModuleId,
-        NoMessages        = (3   << ErrorCodeShift) | ModuleId,
-        ObjectInvalid     = (500 << ErrorCodeShift) | ModuleId,
-        OutOfBounds       = (503 << ErrorCodeShift) | ModuleId,
-        InvalidParameters = (506 << ErrorCodeShift) | ModuleId,
-        NullObject        = (518 << ErrorCodeShift) | ModuleId
+        NotAvailable           = (2   << ErrorCodeShift) | ModuleId,
+        NoMessages             = (3   << ErrorCodeShift) | ModuleId,
+        ObjectInvalid          = (500 << ErrorCodeShift) | ModuleId,
+        OutOfBounds            = (503 << ErrorCodeShift) | ModuleId,
+        InvalidParameters      = (506 << ErrorCodeShift) | ModuleId,
+        UnbalancedFatalSection = (512 << ErrorCodeShift) | ModuleId,
+        NullObject             = (518 << ErrorCodeShift) | ModuleId
     }
 }
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