Refactor SVC handler (#540)

* Refactor SVC handler

* Get rid of KernelErr

* Split kernel code files into multiple folders

Ryujinx.HLE/HOS/Kernel/Process/KTlsPageManager.cs

@@ -0,0 +1,61 @@
+using Ryujinx.HLE.HOS.Kernel.Memory;
+using System;
+
+namespace Ryujinx.HLE.HOS.Kernel.Process
+{
+    class KTlsPageManager
+    {
+        private const int TlsEntrySize = 0x200;
+
+        private long _pagePosition;
+
+        private int _usedSlots;
+
+        private bool[] _slots;
+
+        public bool IsEmpty => _usedSlots == 0;
+        public bool IsFull  => _usedSlots == _slots.Length;
+
+        public KTlsPageManager(long pagePosition)
+        {
+            _pagePosition = pagePosition;
+
+            _slots = new bool[KMemoryManager.PageSize / TlsEntrySize];
+        }
+
+        public bool TryGetFreeTlsAddr(out long position)
+        {
+            position = _pagePosition;
+
+            for (int index = 0; index < _slots.Length; index++)
+            {
+                if (!_slots[index])
+                {
+                    _slots[index] = true;
+
+                    _usedSlots++;
+
+                    return true;
+                }
+
+                position += TlsEntrySize;
+            }
+
+            position = 0;
+
+            return false;
+        }
+
+        public void FreeTlsSlot(int slot)
+        {
+            if ((uint)slot > _slots.Length)
+            {
+                throw new ArgumentOutOfRangeException(nameof(slot));
+            }
+
+            _slots[slot] = false;
+
+            _usedSlots--;
+        }
+    }
+}