1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
using Ryujinx.Memory.Range;
using System.Collections.Generic;
using System.Threading;
namespace Ryujinx.Memory.Tracking
{
/// <summary>
/// A tracking handle for a given region of virtual memory. The Dirty flag is updated whenever any changes are made,
/// and an action can be performed when the region is read to or written from.
/// </summary>
public class RegionHandle : IRegionHandle, IRange
{
public bool Dirty { get; private set; }
public ulong Address { get; }
public ulong Size { get; }
public ulong EndAddress { get; }
internal IMultiRegionHandle Parent { get; set; }
internal int SequenceNumber { get; set; }
private RegionSignal _preAction; // Action to perform before a read or write. This will block the memory access.
private readonly List<VirtualRegion> _regions;
private readonly MemoryTracking _tracking;
internal MemoryPermission RequiredPermission => _preAction != null ? MemoryPermission.None : (Dirty ? MemoryPermission.ReadAndWrite : MemoryPermission.Read);
internal RegionSignal PreAction => _preAction;
/// <summary>
/// Create a new region handle. The handle is registered with the given tracking object,
/// and will be notified of any changes to the specified region.
/// </summary>
/// <param name="tracking">Tracking object for the target memory block</param>
/// <param name="address">Virtual address of the region to track</param>
/// <param name="size">Size of the region to track</param>
/// <param name="dirty">Initial value of the dirty flag</param>
internal RegionHandle(MemoryTracking tracking, ulong address, ulong size, bool dirty = true)
{
Dirty = dirty;
Address = address;
Size = size;
EndAddress = address + size;
_tracking = tracking;
_regions = tracking.GetVirtualRegionsForHandle(address, size);
foreach (var region in _regions)
{
region.Handles.Add(this);
}
}
/// <summary>
/// Signal that a memory action occurred within this handle's virtual regions.
/// </summary>
/// <param name="write">Whether the region was written to or read</param>
internal void Signal(ulong address, ulong size, bool write)
{
RegionSignal action = Interlocked.Exchange(ref _preAction, null);
action?.Invoke(address, size);
if (write)
{
Dirty = true;
Parent?.SignalWrite();
}
}
/// <summary>
/// Consume the dirty flag for this handle, and reprotect so it can be set on the next write.
/// </summary>
public void Reprotect()
{
Dirty = false;
lock (_tracking.TrackingLock)
{
foreach (VirtualRegion region in _regions)
{
region.UpdateProtection();
}
}
}
/// <summary>
/// Register an action to perform when the tracked region is read or written.
/// The action is automatically removed after it runs.
/// </summary>
/// <param name="action">Action to call on read or write</param>
public void RegisterAction(RegionSignal action)
{
RegionSignal lastAction = Interlocked.Exchange(ref _preAction, action);
if (lastAction == null && action != lastAction)
{
lock (_tracking.TrackingLock)
{
foreach (VirtualRegion region in _regions)
{
region.UpdateProtection();
}
}
}
}
/// <summary>
/// Add a child virtual region to this handle.
/// </summary>
/// <param name="region">Virtual region to add as a child</param>
internal void AddChild(VirtualRegion region)
{
_regions.Add(region);
}
/// <summary>
/// Check if this region overlaps with another.
/// </summary>
/// <param name="address">Base address</param>
/// <param name="size">Size of the region</param>
/// <returns>True if overlapping, false otherwise</returns>
public bool OverlapsWith(ulong address, ulong size)
{
return Address < address + size && address < EndAddress;
}
/// <summary>
/// Dispose the handle. Within the tracking lock, this removes references from virtual and physical regions.
/// </summary>
public void Dispose()
{
lock (_tracking.TrackingLock)
{
foreach (VirtualRegion region in _regions)
{
region.RemoveHandle(this);
}
}
}
}
}
|
