From 86fd0643c26433362a25acceb4fa1fcee07dd0b2 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Tue, 17 Jan 2023 01:13:24 -0300
Subject: Implement support for page sizes > 4KB (#4252)

* Implement support for page sizes > 4KB

* Check and work around more alignment issues

* Was not meant to change this

* Use MemoryBlock.GetPageSize() value for signal handler code

* Do not take the path for private allocations if host supports 4KB pages

* Add Flags attribute on MemoryMapFlags

* Fix dirty region size with 16kb pages

Would accidentally report a size that was too high (generally 16k instead of 4k, uploading 4x as much data)

Co-authored-by: riperiperi <rhy3756547@hotmail.com>
---
 Ryujinx.Memory/Range/HostMemoryRange.cs | 71 +++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create 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
new file mode 100644
index 00000000..79c649d8
--- /dev/null
+++ b/Ryujinx.Memory/Range/HostMemoryRange.cs
@@ -0,0 +1,71 @@
+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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