public MemoryBlock(UIntPtr start, long size)
{
#if !MONO
Start = Kernel32.VirtualAlloc(start, checked ((UIntPtr)size),
Kernel32.AllocationType.RESERVE | Kernel32.AllocationType.COMMIT,
Kernel32.MemoryProtection.NOACCESS);
if (Start == UIntPtr.Zero)
{
throw new InvalidOperationException("VirtualAlloc() returned NULL");
}
if (start != UIntPtr.Zero)
{
End = (UIntPtr)((long)start + size);
}
else
{
End = (UIntPtr)((long)Start + size);
}
Size = (long)End - (long)Start;
#else
Start = LibC.mmap(start, checked ((UIntPtr)size), 0, LibC.MapType.MAP_ANONYMOUS, -1, IntPtr.Zero);
if (Start == UIntPtr.Zero)
{
throw new InvalidOperationException("mmap() returned NULL");
}
End = (UIntPtr)((long)Start + size);
Size = (long)End - (long)Start;
#endif
}
/// <summary>
/// allocate size bytes starting at a particular address
/// </summary>
/// <param name="start"></param>
/// <param name="size"></param>
public MemoryBlock(ulong start, ulong size)
{
#if !MONO
Start = (ulong)Kernel32.VirtualAlloc(Z.UU(start), Z.UU(size),
Kernel32.AllocationType.RESERVE | Kernel32.AllocationType.COMMIT,
Kernel32.MemoryProtection.NOACCESS);
if (Start == 0)
{
throw new InvalidOperationException("VirtualAlloc() returned NULL");
}
if (start != 0)
{
End = start + size;
}
else
{
End = Start + size;
}
Size = End - Start;
#else
Start = (ulong)LibC.mmap(ZC.U(start), ZC.U(size), 0, LibC.MapType.MAP_ANONYMOUS, -1, IntPtr.Zero);
if (Start == 0)
{
throw new InvalidOperationException("mmap() returned NULL");
}
End = Start + size;
Size = End - Start;
#endif
}
static void openEndpoint(string path, ref FileHandle file, ref IntPtr mapped, int size)
{
file = FileHandle.openFile(path, eFileFlags.O_RDWR | eFileFlags.O_SYNC);
mapped = LibC.mmap(IntPtr.Zero, (UIntPtr)size, eMemoryProtection.ReadWrite, (int)eMapFlags.Shared, file, (IntPtr)0);
if (mapped == LibC.MAP_FAILED)
{
throw LibC.exception($"memory map failed for device \"{ path }\"", -1);
}
}