/// <summary>
/// allocate size bytes starting at a particular address
/// </summary>
public MemoryBlock(ulong start, ulong size)
{
if (OSTailoredCode.CurrentOS != OSTailoredCode.DistinctOS.Windows)
{
throw new InvalidOperationException("MemoryBlock ctor called on Unix");
}
if (!WaterboxUtils.Aligned(start))
{
throw new ArgumentOutOfRangeException();
}
if (size == 0)
{
throw new ArgumentOutOfRangeException();
}
size = WaterboxUtils.AlignUp(size);
_handle = Kernel32.CreateFileMapping(Kernel32.INVALID_HANDLE_VALUE, IntPtr.Zero,
Kernel32.FileMapProtection.PageExecuteReadWrite | Kernel32.FileMapProtection.SectionCommit, (uint)(size >> 32), (uint)size, null);
if (_handle == IntPtr.Zero)
{
throw new InvalidOperationException($"{nameof(Kernel32.CreateFileMapping)}() returned NULL");
}
Start = start;
End = start + size;
Size = size;
_pageData = new Protection[GetPage(End - 1) + 1];
}
/// <summary>allocate <paramref name="size"/> bytes starting at a particular address <paramref name="start"/></summary>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="start"/> is not aligned or <paramref name="size"/> is <c>0</c></exception>
protected MemoryBlockBase(ulong start, ulong size)
{
if (!WaterboxUtils.Aligned(start))
{
throw new ArgumentOutOfRangeException(nameof(start), start, "start address must be aligned");
}
if (size == 0)
{
throw new ArgumentOutOfRangeException(nameof(size), size, "cannot create 0-length block");
}
Size = WaterboxUtils.AlignUp(size);
AddressRange = start.RangeToExclusive(start + Size);
_pageData = new Protection[1 + GetPage(AddressRange.EndInclusive)];
}
protected MemoryBlockBase(ulong start, ulong size)
{
if (!WaterboxUtils.Aligned(start))
{
throw new ArgumentOutOfRangeException();
}
if (size == 0)
{
throw new ArgumentOutOfRangeException();
}
Start = start;
Size = WaterboxUtils.AlignUp(size);
End = Start + Size;
_pageData = new Protection[GetPage(End - 1) + 1];
}
/// <summary>
/// allocate size bytes starting at a particular address
/// </summary>
/// <param name="start"></param>
/// <param name="size"></param>
public MemoryBlockUnix(ulong start, ulong size)
{
if (!WaterboxUtils.Aligned(start))
{
throw new ArgumentOutOfRangeException();
}
if (size == 0)
{
throw new ArgumentOutOfRangeException();
}
size = WaterboxUtils.AlignUp(size);
_fd = memfd_create("MemoryBlockUnix", 0);
if (_fd == -1)
{
throw new InvalidOperationException("memfd_create() returned -1");
}
Start = start;
End = start + size;
Size = size;
_pageData = new Protection[GetPage(End - 1) + 1];
}
/// <summary>
/// allocate size bytes starting at a particular address
/// </summary>
/// <param name="start"></param>
/// <param name="size"></param>
public MemoryBlockWin32(ulong start, ulong size)
{
if (!WaterboxUtils.Aligned(start))
{
throw new ArgumentOutOfRangeException();
}
if (size == 0)
{
throw new ArgumentOutOfRangeException();
}
size = WaterboxUtils.AlignUp(size);
_handle = Kernel32.CreateFileMapping(Kernel32.INVALID_HANDLE_VALUE, IntPtr.Zero, Kernel32.FileMapProtection.PageExecuteReadWrite | Kernel32.FileMapProtection.SectionCommit, (uint)(size >> 32), (uint)size, null);
if (_handle == IntPtr.Zero)
{
throw new InvalidOperationException("CreateFileMapping() returned NULL");
}
Start = start;
End = start + size;
Size = size;
_pageData = new Protection[GetPage(End - 1) + 1];
}