From 5def0429f82c795d820b2307a0301b78dfb1e6b7 Mon Sep 17 00:00:00 2001
From: jhorv <38920027+jhorv@users.noreply.github.com>
Date: Thu, 4 Apr 2024 21:23:03 -0400
Subject: Add support to IVirtualMemoryManager for zero-copy reads (#6251)

* - WritableRegion: enable wrapping IMemoryOwner<byte>
- IVirtualMemoryManager impls of GetWritableRegion() use pooled memory when region is non-contiguous.
- IVirtualMemoryManager: add GetReadOnlySequence() and impls
- ByteMemoryPool: add new method RentCopy()
- ByteMemoryPool: make class static, remove ctor and singleton field from earlier impl

* - BytesReadOnlySequenceSegment: move from Ryujinx.Common.Memory to Ryujinx.Memory
- BytesReadOnlySequenceSegment: add IsContiguousWith() and Replace() methods
- VirtualMemoryManagerBase:
  - remove generic type parameters, instead use ulong for virtual addresses and nuint for host/physical addresses
  - implement IWritableBlock
  - add virtual GetReadOnlySequence() with coalescing of contiguous segments
  - add virtual GetSpan()
  - add virtual GetWritableRegion()
  - add abstract IsMapped()
  - add virtual MapForeign(ulong, nuint, ulong)
  - add virtual Read<T>()
  - add virtual Read(ulong, Span<byte>)
  - add virtual ReadTracked<T>()
  - add virtual SignalMemoryTracking()
  - add virtual Write()
  - add virtual Write<T>()
  - add virtual WriteUntracked()
  - add virtual WriteWithRedundancyCheck()
- VirtualMemoryManagerRefCountedBase: remove generic type parameters
- AddressSpaceManager: remove redundant methods, add required overrides
- HvMemoryManager: remove redundant methods, add required overrides, add overrides for _invalidAccessHandler handling
- MemoryManager: remove redundant methods, add required overrides, add overrides for _invalidAccessHandler handling
- MemoryManagerHostMapped: remove redundant methods, add required overrides, add overrides for _invalidAccessHandler handling
- NativeMemoryManager: add get properties for Pointer and Length
- throughout: removed invalid <inheritdoc/> comments

* make HvMemoryManager class sealed

* remove unused method

* adjust MemoryManagerHostTracked

* let MemoryManagerHostTracked override WriteImpl()
---
 src/Ryujinx.Memory/NativeMemoryManager.cs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/Ryujinx.Memory/NativeMemoryManager.cs')

diff --git a/src/Ryujinx.Memory/NativeMemoryManager.cs b/src/Ryujinx.Memory/NativeMemoryManager.cs
index fe718bda..9ca63293 100644
--- a/src/Ryujinx.Memory/NativeMemoryManager.cs
+++ b/src/Ryujinx.Memory/NativeMemoryManager.cs
@@ -14,6 +14,10 @@ namespace Ryujinx.Memory
             _length = length;
         }
 
+        public unsafe T* Pointer => _pointer;
+
+        public int Length => _length;
+
         public override Span<T> GetSpan()
         {
             return new Span<T>((void*)_pointer, _length);
-- 
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