From c393cdf8e3775bc95850e4d8c8e4c446b286d3b4 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Wed, 15 Aug 2018 15:59:51 -0300
Subject: More flexible memory manager (#307)

* Keep track mapped buffers with fixed offsets

* Started rewriting the memory manager

* Initial support for MapPhysicalMemory and UnmapPhysicalMemory, other tweaks

* MapPhysicalMemory/UnmapPhysicalMemory support, other tweaks

* Rebased

* Optimize the map/unmap physical memory svcs

* Integrate shared font support

* Fix address space reserve alignment

* Some fixes related to gpu memory mapping

* Some cleanup

* Only try uploading const buffers that are really used

* Check if memory region is contiguous

* Rebased

* Add missing count increment on IsRegionModified

* Check for reads/writes outside of the address space, optimize translation with a tail call
---
 Ryujinx.HLE/Memory/ArenaAllocator.cs | 112 +++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 Ryujinx.HLE/Memory/ArenaAllocator.cs

(limited to 'Ryujinx.HLE/Memory/ArenaAllocator.cs')

diff --git a/Ryujinx.HLE/Memory/ArenaAllocator.cs b/Ryujinx.HLE/Memory/ArenaAllocator.cs
new file mode 100644
index 00000000..5e15f46a
--- /dev/null
+++ b/Ryujinx.HLE/Memory/ArenaAllocator.cs
@@ -0,0 +1,112 @@
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.Memory
+{
+    class ArenaAllocator
+    {
+        private class Region
+        {
+            public long Position { get; set; }
+            public long Size     { get; set; }
+
+            public Region(long Position, long Size)
+            {
+                this.Position = Position;
+                this.Size     = Size;
+            }
+        }
+
+        private LinkedList<Region> FreeRegions;
+
+        public long TotalAvailableSize { get; private set; }
+        public long TotalUsedSize      { get; private set; }
+
+        public ArenaAllocator(long ArenaSize)
+        {
+            TotalAvailableSize = ArenaSize;
+
+            FreeRegions = new LinkedList<Region>();
+
+            FreeRegions.AddFirst(new Region(0, ArenaSize));
+        }
+
+        public bool TryAllocate(long Size, out long Position)
+        {
+            LinkedListNode<Region> Node = FreeRegions.First;
+
+            while (Node != null)
+            {
+                Region Rg = Node.Value;
+
+                if ((ulong)Rg.Size >= (ulong)Size)
+                {
+                    Position = Rg.Position;
+
+                    Rg.Position += Size;
+                    Rg.Size     -= Size;
+
+                    TotalUsedSize += Size;
+
+                    return true;
+                }
+
+                Node = Node.Next;
+            }
+
+            Position = 0;
+
+            return false;
+        }
+
+        public void Free(long Position, long Size)
+        {
+            long End = Position + Size;
+
+            Region NewRg = new Region(Position, Size);
+
+            LinkedListNode<Region> Node   = FreeRegions.First;
+            LinkedListNode<Region> PrevSz = Node;
+
+            while (Node != null)
+            {
+                LinkedListNode<Region> NextNode = Node.Next;
+
+                Region Rg = Node.Value;
+
+                long RgEnd = Rg.Position + Rg.Size;
+
+                if (Rg.Position == End)
+                {
+                    NewRg.Size += Rg.Size;
+
+                    FreeRegions.Remove(Node);
+                }
+                else if (RgEnd == Position)
+                {
+                    NewRg.Position  = Rg.Position;
+                    NewRg.Size     += Rg.Size;
+
+                    FreeRegions.Remove(Node);
+                }
+                else if ((ulong)Rg.Size < (ulong)NewRg.Size &&
+                         (ulong)Rg.Size > (ulong)PrevSz.Value.Size)
+                {
+                    PrevSz = Node;
+                }
+
+                Node = NextNode;
+            }
+
+            if ((ulong)PrevSz.Value.Size < (ulong)Size)
+            {
+                FreeRegions.AddAfter(PrevSz, NewRg);
+            }
+            else
+            {
+                FreeRegions.AddFirst(NewRg);
+            }
+
+            TotalUsedSize -= Size;
+        }
+    }
+}
\ No newline at end of file
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