1 files changed, 93 insertions, 0 deletions
diff --git a/Ryujinx.Memory/WindowsShared/WindowsApi.cs b/Ryujinx.Memory/WindowsShared/WindowsApi.cs
new file mode 100644
index 00000000..297bd1ee
--- /dev/null
+++ b/Ryujinx.Memory/WindowsShared/WindowsApi.cs
@@ -0,0 +1,93 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Memory.WindowsShared
+{
+    static class WindowsApi
+    {
+        public static readonly IntPtr InvalidHandleValue = new IntPtr(-1);
+        public static readonly IntPtr CurrentProcessHandle = new IntPtr(-1);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern IntPtr VirtualAlloc(
+            IntPtr lpAddress,
+            IntPtr dwSize,
+            AllocationType flAllocationType,
+            MemoryProtection flProtect);
+
+        [DllImport("KernelBase.dll", SetLastError = true)]
+        public static extern IntPtr VirtualAlloc2(
+            IntPtr process,
+            IntPtr lpAddress,
+            IntPtr dwSize,
+            AllocationType flAllocationType,
+            MemoryProtection flProtect,
+            IntPtr extendedParameters,
+            ulong parameterCount);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern bool VirtualProtect(
+            IntPtr lpAddress,
+            IntPtr dwSize,
+            MemoryProtection flNewProtect,
+            out MemoryProtection lpflOldProtect);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern bool VirtualFree(IntPtr lpAddress, IntPtr dwSize, AllocationType dwFreeType);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern IntPtr CreateFileMapping(
+            IntPtr hFile,
+            IntPtr lpFileMappingAttributes,
+            FileMapProtection flProtect,
+            uint dwMaximumSizeHigh,
+            uint dwMaximumSizeLow,
+            [MarshalAs(UnmanagedType.LPWStr)] string lpName);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern bool CloseHandle(IntPtr hObject);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern IntPtr MapViewOfFile(
+            IntPtr hFileMappingObject,
+            uint dwDesiredAccess,
+            uint dwFileOffsetHigh,
+            uint dwFileOffsetLow,
+            IntPtr dwNumberOfBytesToMap);
+
+        [DllImport("KernelBase.dll", SetLastError = true)]
+        public static extern IntPtr MapViewOfFile3(
+            IntPtr hFileMappingObject,
+            IntPtr process,
+            IntPtr baseAddress,
+            ulong offset,
+            IntPtr dwNumberOfBytesToMap,
+            ulong allocationType,
+            MemoryProtection dwDesiredAccess,
+            IntPtr extendedParameters,
+            ulong parameterCount);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern bool UnmapViewOfFile(IntPtr lpBaseAddress);
+
+        [DllImport("KernelBase.dll", SetLastError = true)]
+        public static extern bool UnmapViewOfFile2(IntPtr process, IntPtr lpBaseAddress, ulong unmapFlags);
+
+        [DllImport("kernel32.dll")]
+        public static extern uint GetLastError();
+
+        public static MemoryProtection GetProtection(MemoryPermission permission)
+        {
+            return permission switch
+            {
+                MemoryPermission.None => MemoryProtection.NoAccess,
+                MemoryPermission.Read => MemoryProtection.ReadOnly,
+                MemoryPermission.ReadAndWrite => MemoryProtection.ReadWrite,
+                MemoryPermission.ReadAndExecute => MemoryProtection.ExecuteRead,
+                MemoryPermission.ReadWriteExecute => MemoryProtection.ExecuteReadWrite,
+                MemoryPermission.Execute => MemoryProtection.Execute,
+                _ => throw new MemoryProtectionException(permission)
+            };
+        }
+    }
+}
+\ No newline at end of file