From 95017b8c66f70406e926b278ecdd6d4ec0a93110 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Mon, 2 May 2022 20:30:02 -0300
Subject: Support memory aliasing (#2954)

* Back to the origins: Make memory manager take guest PA rather than host address once again

* Direct mapping with alias support on Windows

* Fixes and remove more of the emulated shared memory

* Linux support

* Make shared and transfer memory not depend on SharedMemoryStorage

* More efficient view mapping on Windows (no more restricted to 4KB pages at a time)

* Handle potential access violations caused by partial unmap

* Implement host mapping using shared memory on Linux

* Add new GetPhysicalAddressChecked method, used to ensure the virtual address is mapped before address translation

Also align GetRef behaviour with software memory manager

* We don't need a mirrorable memory block for software memory manager mode

* Disable memory aliasing tests while we don't have shared memory support on Mac

* Shared memory & SIGBUS handler for macOS

* Fix typo + nits + re-enable memory tests

* Set MAP_JIT_DARWIN on x86 Mac too

* Add back the address space mirror

* Only set MAP_JIT_DARWIN if we are mapping as executable

* Disable aliasing tests again (still fails on Mac)

* Fix UnmapView4KB (by not casting size to int)

* Use ref counting on memory blocks to delay closing the shared memory handle until all blocks using it are disposed

* Address PR feedback

* Make RO hold a reference to the guest process memory manager to avoid early disposal

Co-authored-by: nastys <nastys@users.noreply.github.com>
---
 Ryujinx.Memory/Range/HostMemoryRange.cs | 71 ---------------------------------
 1 file changed, 71 deletions(-)
 delete mode 100644 Ryujinx.Memory/Range/HostMemoryRange.cs

(limited to 'Ryujinx.Memory/Range/HostMemoryRange.cs')

diff --git a/Ryujinx.Memory/Range/HostMemoryRange.cs b/Ryujinx.Memory/Range/HostMemoryRange.cs
deleted file mode 100644
index c6d8689c..00000000
--- a/Ryujinx.Memory/Range/HostMemoryRange.cs
+++ /dev/null
@@ -1,71 +0,0 @@
-using System;
-
-namespace Ryujinx.Memory.Range
-{
-    /// <summary>
-    /// Range of memory composed of an address and size.
-    /// </summary>
-    public struct HostMemoryRange : IEquatable<HostMemoryRange>
-    {
-        /// <summary>
-        /// An empty memory range, with a null address and zero size.
-        /// </summary>
-        public static HostMemoryRange Empty => new HostMemoryRange(0, 0);
-
-        /// <summary>
-        /// Start address of the range.
-        /// </summary>
-        public nuint Address { get; }
-
-        /// <summary>
-        /// Size of the range in bytes.
-        /// </summary>
-        public ulong Size { get; }
-
-        /// <summary>
-        /// Address where the range ends (exclusive).
-        /// </summary>
-        public nuint EndAddress => Address + (nuint)Size;
-
-        /// <summary>
-        /// Creates a new memory range with the specified address and size.
-        /// </summary>
-        /// <param name="address">Start address</param>
-        /// <param name="size">Size in bytes</param>
-        public HostMemoryRange(nuint address, ulong size)
-        {
-            Address = address;
-            Size = size;
-        }
-
-        /// <summary>
-        /// Checks if the range overlaps with another.
-        /// </summary>
-        /// <param name="other">The other range to check for overlap</param>
-        /// <returns>True if the ranges overlap, false otherwise</returns>
-        public bool OverlapsWith(HostMemoryRange other)
-        {
-            nuint thisAddress = Address;
-            nuint thisEndAddress = EndAddress;
-            nuint otherAddress = other.Address;
-            nuint otherEndAddress = other.EndAddress;
-
-            return thisAddress < otherEndAddress && otherAddress < thisEndAddress;
-        }
-
-        public override bool Equals(object obj)
-        {
-            return obj is HostMemoryRange other && Equals(other);
-        }
-
-        public bool Equals(HostMemoryRange other)
-        {
-            return Address == other.Address && Size == other.Size;
-        }
-
-        public override int GetHashCode()
-        {
-            return HashCode.Combine(Address, Size);
-        }
-    }
-}
-- 
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