1 files changed, 144 insertions, 0 deletions
diff --git a/src/Ryujinx.Memory/MemoryManagementWindows.cs b/src/Ryujinx.Memory/MemoryManagementWindows.cs
new file mode 100644
index 00000000..2f89a921
--- /dev/null
+++ b/src/Ryujinx.Memory/MemoryManagementWindows.cs
@@ -0,0 +1,144 @@
+using Ryujinx.Memory.WindowsShared;
+using System;
+using System.Runtime.Versioning;
+
+namespace Ryujinx.Memory
+{
+    [SupportedOSPlatform("windows")]
+    static class MemoryManagementWindows
+    {
+        public const int PageSize = 0x1000;
+
+        private static readonly PlaceholderManager _placeholders = new PlaceholderManager();
+
+        public static IntPtr Allocate(IntPtr size)
+        {
+            return AllocateInternal(size, AllocationType.Reserve | AllocationType.Commit);
+        }
+
+        public static IntPtr Reserve(IntPtr size, bool viewCompatible)
+        {
+            if (viewCompatible)
+            {
+                IntPtr baseAddress = AllocateInternal2(size, AllocationType.Reserve | AllocationType.ReservePlaceholder);
+
+                _placeholders.ReserveRange((ulong)baseAddress, (ulong)size);
+
+                return baseAddress;
+            }
+
+            return AllocateInternal(size, AllocationType.Reserve);
+        }
+
+        private static IntPtr AllocateInternal(IntPtr size, AllocationType flags = 0)
+        {
+            IntPtr ptr = WindowsApi.VirtualAlloc(IntPtr.Zero, size, flags, MemoryProtection.ReadWrite);
+
+            if (ptr == IntPtr.Zero)
+            {
+                throw new OutOfMemoryException();
+            }
+
+            return ptr;
+        }
+
+        private static IntPtr AllocateInternal2(IntPtr size, AllocationType flags = 0)
+        {
+            IntPtr ptr = WindowsApi.VirtualAlloc2(WindowsApi.CurrentProcessHandle, IntPtr.Zero, size, flags, MemoryProtection.NoAccess, IntPtr.Zero, 0);
+
+            if (ptr == IntPtr.Zero)
+            {
+                throw new OutOfMemoryException();
+            }
+
+            return ptr;
+        }
+
+        public static bool Commit(IntPtr location, IntPtr size)
+        {
+            return WindowsApi.VirtualAlloc(location, size, AllocationType.Commit, MemoryProtection.ReadWrite) != IntPtr.Zero;
+        }
+
+        public static bool Decommit(IntPtr location, IntPtr size)
+        {
+            return WindowsApi.VirtualFree(location, size, AllocationType.Decommit);
+        }
+
+        public static void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, IntPtr size, MemoryBlock owner)
+        {
+            _placeholders.MapView(sharedMemory, srcOffset, location, size, owner);
+        }
+
+        public static void UnmapView(IntPtr sharedMemory, IntPtr location, IntPtr size, MemoryBlock owner)
+        {
+            _placeholders.UnmapView(sharedMemory, location, size, owner);
+        }
+
+        public static bool Reprotect(IntPtr address, IntPtr size, MemoryPermission permission, bool forView)
+        {
+            if (forView)
+            {
+                return _placeholders.ReprotectView(address, size, permission);
+            }
+            else
+            {
+                return WindowsApi.VirtualProtect(address, size, WindowsApi.GetProtection(permission), out _);
+            }
+        }
+
+        public static bool Free(IntPtr address, IntPtr size)
+        {
+            _placeholders.UnreserveRange((ulong)address, (ulong)size);
+
+            return WindowsApi.VirtualFree(address, IntPtr.Zero, AllocationType.Release);
+        }
+
+        public static IntPtr CreateSharedMemory(IntPtr size, bool reserve)
+        {
+            var prot = reserve ? FileMapProtection.SectionReserve : FileMapProtection.SectionCommit;
+
+            IntPtr handle = WindowsApi.CreateFileMapping(
+                WindowsApi.InvalidHandleValue,
+                IntPtr.Zero,
+                FileMapProtection.PageReadWrite | prot,
+                (uint)(size.ToInt64() >> 32),
+                (uint)size.ToInt64(),
+                null);
+
+            if (handle == IntPtr.Zero)
+            {
+                throw new OutOfMemoryException();
+            }
+
+            return handle;
+        }
+
+        public static void DestroySharedMemory(IntPtr handle)
+        {
+            if (!WindowsApi.CloseHandle(handle))
+            {
+                throw new ArgumentException("Invalid handle.", nameof(handle));
+            }
+        }
+
+        public static IntPtr MapSharedMemory(IntPtr handle)
+        {
+            IntPtr ptr = WindowsApi.MapViewOfFile(handle, 4 | 2, 0, 0, IntPtr.Zero);
+
+            if (ptr == IntPtr.Zero)
+            {
+                throw new OutOfMemoryException();
+            }
+
+            return ptr;
+        }
+
+        public static void UnmapSharedMemory(IntPtr address)
+        {
+            if (!WindowsApi.UnmapViewOfFile(address))
+            {
+                throw new ArgumentException("Invalid address.", nameof(address));
+            }
+        }
+    }
+}
+\ No newline at end of file