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using System;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
namespace Ryujinx.Memory
{
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
public static partial 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_FIXED = 16,
MAP_UNLOCKED = 32,
MAP_JIT_DARWIN = 0x800,
}
[Flags]
public enum OpenFlags : uint
{
O_RDONLY = 0,
O_WRONLY = 1,
O_RDWR = 2,
O_CREAT = 4,
O_EXCL = 8,
O_NOCTTY = 16,
O_TRUNC = 32,
O_APPEND = 64,
O_NONBLOCK = 128,
O_SYNC = 256,
}
public const IntPtr MAP_FAILED = -1;
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_ANONYMOUS_DARWIN = 0x1000;
public const int MADV_DONTNEED = 4;
public const int MADV_REMOVE = 9;
[LibraryImport("libc", EntryPoint = "mmap", SetLastError = true)]
private static partial IntPtr Internal_mmap(IntPtr address, ulong length, MmapProts prot, int flags, int fd, long offset);
[LibraryImport("libc", SetLastError = true)]
public static partial int mprotect(IntPtr address, ulong length, MmapProts prot);
[LibraryImport("libc", SetLastError = true)]
public static partial int munmap(IntPtr address, ulong length);
[LibraryImport("libc", SetLastError = true)]
public static partial IntPtr mremap(IntPtr old_address, ulong old_size, ulong new_size, int flags, IntPtr new_address);
[LibraryImport("libc", SetLastError = true)]
public static partial int madvise(IntPtr address, ulong size, int advice);
[LibraryImport("libc", SetLastError = true)]
public static partial int mkstemp(IntPtr template);
[LibraryImport("libc", SetLastError = true)]
public static partial int unlink(IntPtr pathname);
[LibraryImport("libc", SetLastError = true)]
public static partial int ftruncate(int fildes, IntPtr length);
[LibraryImport("libc", SetLastError = true)]
public static partial int close(int fd);
[LibraryImport("libc", SetLastError = true)]
public static partial int shm_open(IntPtr name, int oflag, uint mode);
[LibraryImport("libc", SetLastError = true)]
public static partial int shm_unlink(IntPtr name);
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_FIXED))
{
result |= (int)MmapFlags.MAP_FIXED;
}
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 (flags.HasFlag(MmapFlags.MAP_JIT_DARWIN) && OperatingSystem.IsMacOSVersionAtLeast(10, 14))
{
result |= (int)MmapFlags.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);
}
}
}
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