2 files changed, 93 insertions, 0 deletions

diff --git a/ARMeilleure/Memory/IMemoryManager.cs b/ARMeilleure/Memory/IMemoryManager.cs
index cacfc4ac..0a25eb97 100644
--- a/ARMeilleure/Memory/IMemoryManager.cs
+++ b/ARMeilleure/Memory/IMemoryManager.cs
@@ -8,16 +8,68 @@ namespace ARMeilleure.Memory
 
         IntPtr PageTablePointer { get; }
 
+        MemoryManagerType Type { get; }
+
+        event Action<ulong, ulong> UnmapEvent;
+
+        /// <summary>
+        /// Reads data from CPU mapped memory.
+        /// </summary>
+        /// <typeparam name="T">Type of the data being read</typeparam>
+        /// <param name="va">Virtual address of the data in memory</param>
+        /// <returns>The data</returns>
         T Read<T>(ulong va) where T : unmanaged;
+
+        /// <summary>
+        /// Reads data from CPU mapped memory, with read tracking
+        /// </summary>
+        /// <typeparam name="T">Type of the data being read</typeparam>
+        /// <param name="va">Virtual address of the data in memory</param>
+        /// <returns>The data</returns>
         T ReadTracked<T>(ulong va) where T : unmanaged;
+
+        /// <summary>
+        /// Writes data to CPU mapped memory.
+        /// </summary>
+        /// <typeparam name="T">Type of the data being written</typeparam>
+        /// <param name="va">Virtual address to write the data into</param>
+        /// <param name="value">Data to be written</param>
         void Write<T>(ulong va, T value) where T : unmanaged;
 
+        /// <summary>
+        /// Gets a read-only span of data from CPU mapped memory.
+        /// </summary>
+        /// <param name="va">Virtual address of the data</param>
+        /// <param name="size">Size of the data</param>
+        /// <param name="tracked">True if read tracking is triggered on the span</param>
+        /// <returns>A read-only span of the data</returns>
         ReadOnlySpan<byte> GetSpan(ulong va, int size, bool tracked = false);
 
+        /// <summary>
+        /// Gets a reference for the given type at the specified virtual memory address.
+        /// </summary>
+        /// <remarks>
+        /// The data must be located at a contiguous memory region.
+        /// </remarks>
+        /// <typeparam name="T">Type of the data to get the reference</typeparam>
+        /// <param name="va">Virtual address of the data</param>
+        /// <returns>A reference to the data in memory</returns>
         ref T GetRef<T>(ulong va) where T : unmanaged;
 
+        /// <summary>
+        /// Checks if the page at a given CPU virtual address is mapped.
+        /// </summary>
+        /// <param name="va">Virtual address to check</param>
+        /// <returns>True if the address is mapped, false otherwise</returns>
         bool IsMapped(ulong va);
 
+        /// <summary>
+        /// Alerts the memory tracking that a given region has been read from or written to.
+        /// This should be called before read/write is performed.
+        /// </summary>
+        /// <param name="va">Virtual address of the region</param>
+        /// <param name="size">Size of the region</param>
+        /// <param name="write">True if the region was written, false if read</param>
         void SignalMemoryTracking(ulong va, ulong size, bool write);
     }
 }
\ No newline at end of file
diff --git a/ARMeilleure/Memory/MemoryManagerType.cs b/ARMeilleure/Memory/MemoryManagerType.cs
new file mode 100644
index 00000000..ce84ccaf
--- /dev/null
+++ b/ARMeilleure/Memory/MemoryManagerType.cs
@@ -0,0 +1,41 @@
+namespace ARMeilleure.Memory
+{
+    /// <summary>
+    /// Indicates the type of a memory manager and the method it uses for memory mapping
+    /// and address translation. This controls the code generated for memory accesses on the JIT.
+    /// </summary>
+    public enum MemoryManagerType
+    {
+        /// <summary>
+        /// Complete software MMU implementation, the read/write methods are always called,
+        /// without any attempt to perform faster memory access.
+        /// </summary>
+        SoftwareMmu,
+
+        /// <summary>
+        /// High level implementation using a software flat page table for address translation,
+        /// used to speed up address translation if possible without calling the read/write methods.
+        /// </summary>
+        SoftwarePageTable,
+
+        /// <summary>
+        /// High level implementation with mappings managed by the host OS, effectively using hardware
+        /// page tables. No address translation is performed in software and the memory is just accessed directly.
+        /// </summary>
+        HostMapped,
+
+        /// <summary>
+        /// Same as the host mapped memory manager type, but without masking the address within the address space.
+        /// Allows invalid access from JIT code to the rest of the program, but is faster.
+        /// </summary>
+        HostMappedUnsafe
+    }
+
+    static class MemoryManagerTypeExtensions
+    {
+        public static bool IsHostMapped(this MemoryManagerType type)
+        {
+            return type == MemoryManagerType.HostMapped || type == MemoryManagerType.HostMappedUnsafe;
+        }
+    }
+}