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102 lines
3.2 KiB
C#
102 lines
3.2 KiB
C#
using Ryujinx.Memory.Range;
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using System.Collections.Generic;
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namespace Ryujinx.Memory.Tracking
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{
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/// <summary>
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/// A region of virtual memory.
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/// </summary>
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class VirtualRegion : AbstractRegion
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{
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public List<RegionHandle> Handles = new List<RegionHandle>();
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private readonly MemoryTracking _tracking;
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public VirtualRegion(MemoryTracking tracking, ulong address, ulong size) : base(address, size)
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{
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_tracking = tracking;
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}
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public override void Signal(ulong address, ulong size, bool write)
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{
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foreach (var handle in Handles)
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{
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handle.Signal(address, size, write);
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}
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UpdateProtection();
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}
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/// <summary>
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/// Signal that this region has been mapped or unmapped.
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/// </summary>
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/// <param name="mapped">True if the region has been mapped, false if unmapped</param>
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public void SignalMappingChanged(bool mapped)
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{
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foreach (RegionHandle handle in Handles)
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{
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handle.SignalMappingChanged(mapped);
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}
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}
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/// <summary>
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/// Gets the strictest permission that the child handles demand. Assumes that the tracking lock has been obtained.
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/// </summary>
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/// <returns>Protection level that this region demands</returns>
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public MemoryPermission GetRequiredPermission()
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{
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// Start with Read/Write, each handle can strip off permissions as necessary.
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// Assumes the tracking lock has already been obtained.
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MemoryPermission result = MemoryPermission.ReadAndWrite;
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foreach (var handle in Handles)
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{
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result &= handle.RequiredPermission;
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if (result == 0) return result;
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}
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return result;
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}
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/// <summary>
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/// Updates the protection for this virtual region.
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/// </summary>
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public void UpdateProtection()
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{
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_tracking.ProtectVirtualRegion(this, GetRequiredPermission());
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}
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/// <summary>
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/// Removes a handle from this virtual region. If there are no handles left, this virtual region is removed.
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/// </summary>
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/// <param name="handle">Handle to remove</param>
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public void RemoveHandle(RegionHandle handle)
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{
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lock (_tracking.TrackingLock)
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{
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Handles.Remove(handle);
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UpdateProtection();
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if (Handles.Count == 0)
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{
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_tracking.RemoveVirtual(this);
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}
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}
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}
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public override INonOverlappingRange Split(ulong splitAddress)
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{
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VirtualRegion newRegion = new VirtualRegion(_tracking, splitAddress, EndAddress - splitAddress);
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Size = splitAddress - Address;
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// The new region inherits all of our parents.
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newRegion.Handles = new List<RegionHandle>(Handles);
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foreach (var parent in Handles)
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{
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parent.AddChild(newRegion);
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}
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return newRegion;
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}
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}
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}
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