diff options
| author | TSR Berry <20988865+TSRBerry@users.noreply.github.com> | 2023-04-08 01:22:00 +0200 |
|---|---|---|
| committer | Mary <thog@protonmail.com> | 2023-04-27 23:51:14 +0200 |
| commit | cee712105850ac3385cd0091a923438167433f9f (patch) | |
| tree | 4a5274b21d8b7f938c0d0ce18736d3f2993b11b1 /src/Ryujinx.Memory/Tracking/VirtualRegion.cs | |
| parent | cd124bda587ef09668a971fa1cac1c3f0cfc9f21 (diff) | |
Move solution and projects to src
Diffstat (limited to 'src/Ryujinx.Memory/Tracking/VirtualRegion.cs')
| -rw-r--r-- | src/Ryujinx.Memory/Tracking/VirtualRegion.cs | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/Ryujinx.Memory/Tracking/VirtualRegion.cs b/src/Ryujinx.Memory/Tracking/VirtualRegion.cs new file mode 100644 index 00000000..9651426b --- /dev/null +++ b/src/Ryujinx.Memory/Tracking/VirtualRegion.cs @@ -0,0 +1,144 @@ +using Ryujinx.Memory.Range; +using System.Collections.Generic; + +namespace Ryujinx.Memory.Tracking +{ + /// <summary> + /// A region of virtual memory. + /// </summary> + class VirtualRegion : AbstractRegion + { + public List<RegionHandle> Handles = new List<RegionHandle>(); + + private readonly MemoryTracking _tracking; + private MemoryPermission _lastPermission; + + public VirtualRegion(MemoryTracking tracking, ulong address, ulong size, MemoryPermission lastPermission = MemoryPermission.Invalid) : base(address, size) + { + _lastPermission = lastPermission; + _tracking = tracking; + } + + /// <inheritdoc/> + public override void Signal(ulong address, ulong size, bool write, int? exemptId) + { + IList<RegionHandle> handles = Handles; + + for (int i = 0; i < handles.Count; i++) + { + if (exemptId == null || handles[i].Id != exemptId.Value) + { + handles[i].Signal(address, size, write, ref handles); + } + } + + UpdateProtection(); + } + + /// <inheritdoc/> + public override void SignalPrecise(ulong address, ulong size, bool write, int? exemptId) + { + IList<RegionHandle> handles = Handles; + + bool allPrecise = true; + + for (int i = 0; i < handles.Count; i++) + { + if (exemptId == null || handles[i].Id != exemptId.Value) + { + allPrecise &= handles[i].SignalPrecise(address, size, write, ref handles); + } + } + + // Only update protection if a regular signal handler was called. + // This allows precise actions to skip reprotection costs if they want (they can still do it manually). + if (!allPrecise) + { + UpdateProtection(); + } + } + + /// <summary> + /// Signal that this region has been mapped or unmapped. + /// </summary> + /// <param name="mapped">True if the region has been mapped, false if unmapped</param> + public void SignalMappingChanged(bool mapped) + { + _lastPermission = MemoryPermission.Invalid; + + foreach (RegionHandle handle in Handles) + { + handle.SignalMappingChanged(mapped); + } + } + + /// <summary> + /// Gets the strictest permission that the child handles demand. Assumes that the tracking lock has been obtained. + /// </summary> + /// <returns>Protection level that this region demands</returns> + public MemoryPermission GetRequiredPermission() + { + // Start with Read/Write, each handle can strip off permissions as necessary. + // Assumes the tracking lock has already been obtained. + + MemoryPermission result = MemoryPermission.ReadAndWrite; + + foreach (var handle in Handles) + { + result &= handle.RequiredPermission; + if (result == 0) return result; + } + return result; + } + + /// <summary> + /// Updates the protection for this virtual region. + /// </summary> + public bool UpdateProtection() + { + MemoryPermission permission = GetRequiredPermission(); + + if (_lastPermission != permission) + { + _tracking.ProtectVirtualRegion(this, permission); + _lastPermission = permission; + + return true; + } + + return false; + } + + /// <summary> + /// Removes a handle from this virtual region. If there are no handles left, this virtual region is removed. + /// </summary> + /// <param name="handle">Handle to remove</param> + public void RemoveHandle(RegionHandle handle) + { + lock (_tracking.TrackingLock) + { + Handles.Remove(handle); + UpdateProtection(); + if (Handles.Count == 0) + { + _tracking.RemoveVirtual(this); + } + } + } + + public override INonOverlappingRange Split(ulong splitAddress) + { + VirtualRegion newRegion = new VirtualRegion(_tracking, splitAddress, EndAddress - splitAddress, _lastPermission); + Size = splitAddress - Address; + + // The new region inherits all of our parents. + newRegion.Handles = new List<RegionHandle>(Handles); + foreach (var parent in Handles) + { + parent.AddChild(newRegion); + } + + return newRegion; + } + } +} |