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Ryujinx/Ryujinx.HLE/HOS/Kernel/Memory/KTransferMemory.cs

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using Ryujinx.HLE.HOS.Kernel.Common;
using Ryujinx.HLE.HOS.Kernel.Process;
using System;
namespace Ryujinx.HLE.HOS.Kernel.Memory
{
class KTransferMemory : KAutoObject
{
private KProcess _creator;
// TODO: Remove when we no longer need to read it from the owner directly.
public KProcess Creator => _creator;
private readonly KPageList _pageList;
public ulong Address { get; private set; }
public ulong Size => _pageList.GetPagesCount() * KMemoryManager.PageSize;
public KMemoryPermission Permission { get; private set; }
private bool _hasBeenInitialized;
private bool _isMapped;
public KTransferMemory(KernelContext context) : base(context)
{
_pageList = new KPageList();
}
public KernelResult Initialize(ulong address, ulong size, KMemoryPermission permission)
{
KProcess creator = KernelStatic.GetCurrentProcess();
_creator = creator;
KernelResult result = creator.MemoryManager.BorrowTransferMemory(_pageList, address, size, permission);
if (result != KernelResult.Success)
{
return result;
}
creator.IncrementReferenceCount();
Permission = permission;
Address = address;
_hasBeenInitialized = true;
_isMapped = false;
return result;
}
protected override void Destroy()
{
if (_hasBeenInitialized)
{
if (!_isMapped && _creator.MemoryManager.UnborrowTransferMemory(Address, Size, _pageList) != KernelResult.Success)
{
throw new InvalidOperationException("Unexpected failure restoring transfer memory attributes.");
}
_creator.ResourceLimit?.Release(LimitableResource.TransferMemory, 1);
_creator.DecrementReferenceCount();
}
}
}
}