1 files changed, 128 insertions, 0 deletions
diff --git a/Ryujinx.Memory/MemoryManagerUnixHelper.cs b/Ryujinx.Memory/MemoryManagerUnixHelper.cs
new file mode 100644
index 00000000..4409ccee
--- /dev/null
+++ b/Ryujinx.Memory/MemoryManagerUnixHelper.cs
@@ -0,0 +1,128 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Memory
+{
+    public static class MemoryManagerUnixHelper
+    {
+        [Flags]
+        public enum MmapProts : uint
+        {
+            PROT_NONE = 0,
+            PROT_READ = 1,
+            PROT_WRITE = 2,
+            PROT_EXEC = 4
+        }
+
+        [Flags]
+        public enum MmapFlags : uint
+        {
+            MAP_SHARED = 1,
+            MAP_PRIVATE = 2,
+            MAP_ANONYMOUS = 4,
+            MAP_NORESERVE = 8,
+            MAP_UNLOCKED = 16
+        }
+
+        private const int MAP_ANONYMOUS_LINUX_GENERIC = 0x20;
+        private const int MAP_NORESERVE_LINUX_GENERIC = 0x4000;
+        private const int MAP_UNLOCKED_LINUX_GENERIC = 0x80000;
+
+        private const int MAP_NORESERVE_DARWIN = 0x40;
+        private const int MAP_JIT_DARWIN = 0x800;
+        private const int MAP_ANONYMOUS_DARWIN = 0x1000;
+
+        public const int MADV_DONTNEED = 4;
+        public const int MADV_REMOVE = 9;
+
+        [DllImport("libc", EntryPoint = "mmap", SetLastError = true)]
+        private static extern IntPtr Internal_mmap(IntPtr address, ulong length, MmapProts prot, int flags, int fd, long offset);
+
+        [DllImport("libc", SetLastError = true)]
+        public static extern int mprotect(IntPtr address, ulong length, MmapProts prot);
+
+        [DllImport("libc", SetLastError = true)]
+        public static extern int munmap(IntPtr address, ulong length);
+
+        [DllImport("libc", SetLastError = true)]
+        public static extern IntPtr mremap(IntPtr old_address, ulong old_size, ulong new_size, int flags, IntPtr new_address);
+
+        [DllImport("libc", SetLastError = true)]
+        public static extern int madvise(IntPtr address, ulong size, int advice);
+
+        private static int MmapFlagsToSystemFlags(MmapFlags flags)
+        {
+            int result = 0;
+
+            if (flags.HasFlag(MmapFlags.MAP_SHARED))
+            {
+                result |= (int)MmapFlags.MAP_SHARED;
+            }
+
+            if (flags.HasFlag(MmapFlags.MAP_PRIVATE))
+            {
+                result |= (int)MmapFlags.MAP_PRIVATE;
+            }
+
+            if (flags.HasFlag(MmapFlags.MAP_ANONYMOUS))
+            {
+                if (OperatingSystem.IsLinux())
+                {
+                    result |= MAP_ANONYMOUS_LINUX_GENERIC;
+                }
+                else if (OperatingSystem.IsMacOS())
+                {
+                    result |= MAP_ANONYMOUS_DARWIN;
+                }
+                else
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            if (flags.HasFlag(MmapFlags.MAP_NORESERVE))
+            {
+                if (OperatingSystem.IsLinux())
+                {
+                    result |= MAP_NORESERVE_LINUX_GENERIC;
+                }
+                else if (OperatingSystem.IsMacOS())
+                {
+                    result |= MAP_NORESERVE_DARWIN;
+                }
+                else
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            if (flags.HasFlag(MmapFlags.MAP_UNLOCKED))
+            {
+                if (OperatingSystem.IsLinux())
+                {
+                    result |= MAP_UNLOCKED_LINUX_GENERIC;
+                }
+                else if (OperatingSystem.IsMacOS())
+                {
+                    // FIXME: Doesn't exist on Darwin
+                }
+                else
+                {
+                    throw new NotImplementedException();
+                }
+            }
+
+            if (OperatingSystem.IsMacOSVersionAtLeast(10, 14))
+            {
+                result |= MAP_JIT_DARWIN;
+            }
+
+            return result;
+        }
+
+        public static IntPtr mmap(IntPtr address, ulong length, MmapProts prot, MmapFlags flags, int fd, long offset)
+        {
+            return Internal_mmap(address, length, prot, MmapFlagsToSystemFlags(flags), fd, offset);
+        }
+    }
+}
+\ No newline at end of file