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using Ryujinx.Common;
using Ryujinx.Cpu.Signal;
using Ryujinx.Memory;
using Ryujinx.Memory.Tracking;
using System;
using System.Runtime.InteropServices;
namespace Ryujinx.Cpu
{
public class MemoryEhMeilleure : IDisposable
{
public delegate ulong TrackingEventDelegate(ulong address, ulong size, bool write);
private readonly MemoryTracking _tracking;
private readonly TrackingEventDelegate _trackingEvent;
private readonly ulong _pageSize;
private readonly ulong _baseAddress;
private readonly ulong _mirrorAddress;
public MemoryEhMeilleure(MemoryBlock addressSpace, MemoryBlock addressSpaceMirror, MemoryTracking tracking, TrackingEventDelegate trackingEvent = null)
{
_baseAddress = (ulong)addressSpace.Pointer;
ulong endAddress = _baseAddress + addressSpace.Size;
_tracking = tracking;
_trackingEvent = trackingEvent ?? VirtualMemoryEvent;
_pageSize = MemoryBlock.GetPageSize();
bool added = NativeSignalHandler.AddTrackedRegion((nuint)_baseAddress, (nuint)endAddress, Marshal.GetFunctionPointerForDelegate(_trackingEvent));
if (!added)
{
throw new InvalidOperationException("Number of allowed tracked regions exceeded.");
}
if (OperatingSystem.IsWindows() && addressSpaceMirror != null)
{
// Add a tracking event with no signal handler for the mirror on Windows.
// The native handler has its own code to check for the partial overlap race when regions are protected by accident,
// and when there is no signal handler present.
_mirrorAddress = (ulong)addressSpaceMirror.Pointer;
ulong endAddressMirror = _mirrorAddress + addressSpace.Size;
bool addedMirror = NativeSignalHandler.AddTrackedRegion((nuint)_mirrorAddress, (nuint)endAddressMirror, IntPtr.Zero);
if (!addedMirror)
{
throw new InvalidOperationException("Number of allowed tracked regions exceeded.");
}
}
}
private ulong VirtualMemoryEvent(ulong address, ulong size, bool write)
{
ulong pageSize = _pageSize;
ulong addressAligned = BitUtils.AlignDown(address, pageSize);
ulong endAddressAligned = BitUtils.AlignUp(address + size, pageSize);
ulong sizeAligned = endAddressAligned - addressAligned;
if (_tracking.VirtualMemoryEvent(addressAligned, sizeAligned, write))
{
return _baseAddress + address;
}
return 0;
}
public void Dispose()
{
GC.SuppressFinalize(this);
NativeSignalHandler.RemoveTrackedRegion((nuint)_baseAddress);
if (_mirrorAddress != 0)
{
NativeSignalHandler.RemoveTrackedRegion((nuint)_mirrorAddress);
}
}
}
}
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