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using System;
using System.Collections.Concurrent;
using System.Runtime.Versioning;
using System.Text;
using static Ryujinx.Memory.MemoryManagerUnixHelper;
namespace Ryujinx.Memory
{
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
static class MemoryManagementUnix
{
private static readonly ConcurrentDictionary<IntPtr, ulong> _allocations = new ConcurrentDictionary<IntPtr, ulong>();
public static IntPtr Allocate(ulong size)
{
return AllocateInternal(size, MmapProts.PROT_READ | MmapProts.PROT_WRITE);
}
public static IntPtr Reserve(ulong size)
{
return AllocateInternal(size, MmapProts.PROT_NONE);
}
private static IntPtr AllocateInternal(ulong size, MmapProts prot, bool shared = false)
{
MmapFlags flags = MmapFlags.MAP_ANONYMOUS;
if (shared)
{
flags |= MmapFlags.MAP_SHARED | MmapFlags.MAP_UNLOCKED;
}
else
{
flags |= MmapFlags.MAP_PRIVATE;
}
if (prot == MmapProts.PROT_NONE)
{
flags |= MmapFlags.MAP_NORESERVE;
}
IntPtr ptr = mmap(IntPtr.Zero, size, prot, flags, -1, 0);
if (ptr == new IntPtr(-1L))
{
throw new OutOfMemoryException();
}
if (!_allocations.TryAdd(ptr, size))
{
// This should be impossible, kernel shouldn't return an already mapped address.
throw new InvalidOperationException();
}
return ptr;
}
public static bool Commit(IntPtr address, ulong size)
{
return mprotect(address, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE) == 0;
}
public static bool Decommit(IntPtr address, ulong size)
{
// Must be writable for madvise to work properly.
mprotect(address, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE);
madvise(address, size, MADV_REMOVE);
return mprotect(address, size, MmapProts.PROT_NONE) == 0;
}
public static bool Reprotect(IntPtr address, ulong size, MemoryPermission permission)
{
return mprotect(address, size, GetProtection(permission)) == 0;
}
private static MmapProts GetProtection(MemoryPermission permission)
{
return permission switch
{
MemoryPermission.None => MmapProts.PROT_NONE,
MemoryPermission.Read => MmapProts.PROT_READ,
MemoryPermission.ReadAndWrite => MmapProts.PROT_READ | MmapProts.PROT_WRITE,
MemoryPermission.ReadAndExecute => MmapProts.PROT_READ | MmapProts.PROT_EXEC,
MemoryPermission.ReadWriteExecute => MmapProts.PROT_READ | MmapProts.PROT_WRITE | MmapProts.PROT_EXEC,
MemoryPermission.Execute => MmapProts.PROT_EXEC,
_ => throw new MemoryProtectionException(permission)
};
}
public static bool Free(IntPtr address)
{
if (_allocations.TryRemove(address, out ulong size))
{
return munmap(address, size) == 0;
}
return false;
}
public static bool Unmap(IntPtr address, ulong size)
{
return munmap(address, size) == 0;
}
public unsafe static IntPtr CreateSharedMemory(ulong size, bool reserve)
{
int fd;
if (OperatingSystem.IsMacOS())
{
byte[] memName = Encoding.ASCII.GetBytes("Ryujinx-XXXXXX");
fixed (byte* pMemName = memName)
{
fd = shm_open((IntPtr)pMemName, 0x2 | 0x200 | 0x800 | 0x400, 384); // O_RDWR | O_CREAT | O_EXCL | O_TRUNC, 0600
if (fd == -1)
{
throw new OutOfMemoryException();
}
if (shm_unlink((IntPtr)pMemName) != 0)
{
throw new OutOfMemoryException();
}
}
}
else
{
byte[] fileName = Encoding.ASCII.GetBytes("/dev/shm/Ryujinx-XXXXXX");
fixed (byte* pFileName = fileName)
{
fd = mkstemp((IntPtr)pFileName);
if (fd == -1)
{
throw new OutOfMemoryException();
}
if (unlink((IntPtr)pFileName) != 0)
{
throw new OutOfMemoryException();
}
}
}
if (ftruncate(fd, (IntPtr)size) != 0)
{
throw new OutOfMemoryException();
}
return (IntPtr)fd;
}
public static void DestroySharedMemory(IntPtr handle)
{
close((int)handle);
}
public static IntPtr MapSharedMemory(IntPtr handle, ulong size)
{
return mmap(IntPtr.Zero, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE, MmapFlags.MAP_SHARED, (int)handle, 0);
}
public static void UnmapSharedMemory(IntPtr address, ulong size)
{
munmap(address, size);
}
public static void MapView(IntPtr sharedMemory, ulong srcOffset, IntPtr location, ulong size)
{
mmap(location, size, MmapProts.PROT_READ | MmapProts.PROT_WRITE, MmapFlags.MAP_FIXED | MmapFlags.MAP_SHARED, (int)sharedMemory, (long)srcOffset);
}
public static void UnmapView(IntPtr location, ulong size)
{
mmap(location, size, MmapProts.PROT_NONE, MmapFlags.MAP_FIXED | MmapFlags.MAP_PRIVATE | MmapFlags.MAP_ANONYMOUS | MmapFlags.MAP_NORESERVE, -1, 0);
}
}
}
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