Move solution and projects to src

src/Ryujinx.Memory/NativeMemoryManager.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Buffers;
+
+namespace Ryujinx.Memory
+{
+    public unsafe class NativeMemoryManager<T> : MemoryManager<T> where T : unmanaged
+    {
+        private readonly T* _pointer;
+        private readonly int _length;
+
+        public NativeMemoryManager(T* pointer, int length)
+        {
+            _pointer = pointer;
+            _length = length;
+        }
+
+        public override Span<T> GetSpan()
+        {
+            return new Span<T>((void*)_pointer, _length);
+        }
+
+        public override MemoryHandle Pin(int elementIndex = 0)
+        {
+            if ((uint)elementIndex >= _length)
+            {
+                throw new ArgumentOutOfRangeException(nameof(elementIndex));
+            }
+
+            return new MemoryHandle((void*)(_pointer + elementIndex));
+        }
+
+        public override void Unpin()
+        {
+            // No need to do anything as pointer already points no native memory, not GC tracked.
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            // Nothing to dispose, MemoryBlock still owns the memory.
+        }
+    }
+}