Move solution and projects to src

6 files changed, 223 insertions, 0 deletions

diff --git a/src/ARMeilleure/Memory/IJitMemoryAllocator.cs b/src/ARMeilleure/Memory/IJitMemoryAllocator.cs
new file mode 100644
index 00000000..19b696b0
--- /dev/null
+++ b/src/ARMeilleure/Memory/IJitMemoryAllocator.cs
@@ -0,0 +1,10 @@
+namespace ARMeilleure.Memory
+{
+    public interface IJitMemoryAllocator
+    {
+        IJitMemoryBlock Allocate(ulong size);
+        IJitMemoryBlock Reserve(ulong size);
+
+        ulong GetPageSize();
+    }
+}
diff --git a/src/ARMeilleure/Memory/IJitMemoryBlock.cs b/src/ARMeilleure/Memory/IJitMemoryBlock.cs
new file mode 100644
index 00000000..670f2862
--- /dev/null
+++ b/src/ARMeilleure/Memory/IJitMemoryBlock.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace ARMeilleure.Memory
+{
+    public interface IJitMemoryBlock : IDisposable
+    {
+        IntPtr Pointer { get; }
+
+        bool Commit(ulong offset, ulong size);
+
+        void MapAsRx(ulong offset, ulong size);
+        void MapAsRwx(ulong offset, ulong size);
+    }
+}
diff --git a/src/ARMeilleure/Memory/IMemoryManager.cs b/src/ARMeilleure/Memory/IMemoryManager.cs
new file mode 100644
index 00000000..5eb1fadd
--- /dev/null
+++ b/src/ARMeilleure/Memory/IMemoryManager.cs
@@ -0,0 +1,77 @@
+using System;
+
+namespace ARMeilleure.Memory
+{
+    public interface IMemoryManager
+    {
+        int AddressSpaceBits { get; }
+
+        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>
+        /// <param name="precise">True if the access is precise, false otherwise</param>
+        /// <param name="exemptId">Optional ID of the handles that should not be signalled</param>
+        void SignalMemoryTracking(ulong va, ulong size, bool write, bool precise = false, int? exemptId = null);
+    }
+}
\ No newline at end of file
diff --git a/src/ARMeilleure/Memory/InvalidAccessException.cs b/src/ARMeilleure/Memory/InvalidAccessException.cs
new file mode 100644
index 00000000..ad540719
--- /dev/null
+++ b/src/ARMeilleure/Memory/InvalidAccessException.cs
@@ -0,0 +1,23 @@
+using System;
+
+namespace ARMeilleure.Memory
+{
+    class InvalidAccessException : Exception
+    {
+        public InvalidAccessException()
+        {
+        }
+
+        public InvalidAccessException(ulong address) : base($"Invalid memory access at virtual address 0x{address:X16}.")
+        {
+        }
+
+        public InvalidAccessException(string message) : base(message)
+        {
+        }
+
+        public InvalidAccessException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+    }
+}
diff --git a/src/ARMeilleure/Memory/MemoryManagerType.cs b/src/ARMeilleure/Memory/MemoryManagerType.cs
new file mode 100644
index 00000000..ce84ccaf
--- /dev/null
+++ b/src/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;
+        }
+    }
+}
diff --git a/src/ARMeilleure/Memory/ReservedRegion.cs b/src/ARMeilleure/Memory/ReservedRegion.cs
new file mode 100644
index 00000000..2197afad
--- /dev/null
+++ b/src/ARMeilleure/Memory/ReservedRegion.cs
@@ -0,0 +1,58 @@
+using System;
+
+namespace ARMeilleure.Memory
+{
+    class ReservedRegion
+    {
+        public const int DefaultGranularity = 65536; // Mapping granularity in Windows.
+
+        public IJitMemoryBlock Block { get; }
+
+        public IntPtr Pointer => Block.Pointer;
+
+        private readonly ulong _maxSize;
+        private readonly ulong _sizeGranularity;
+        private ulong _currentSize;
+
+        public ReservedRegion(IJitMemoryAllocator allocator, ulong maxSize, ulong granularity = 0)
+        {
+            if (granularity == 0)
+            {
+                granularity = DefaultGranularity;
+            }
+
+            Block = allocator.Reserve(maxSize);
+            _maxSize = maxSize;
+            _sizeGranularity = granularity;
+            _currentSize = 0;
+        }
+
+        public void ExpandIfNeeded(ulong desiredSize)
+        {
+            if (desiredSize > _maxSize)
+            {
+                throw new OutOfMemoryException();
+            }
+
+            if (desiredSize > _currentSize)
+            {
+                // Lock, and then check again. We only want to commit once.
+                lock (this)
+                {
+                    if (desiredSize >= _currentSize)
+                    {
+                        ulong overflowBytes = desiredSize - _currentSize;
+                        ulong moreToCommit = (((_sizeGranularity - 1) + overflowBytes) / _sizeGranularity) * _sizeGranularity; // Round up.
+                        Block.Commit(_currentSize, moreToCommit);
+                        _currentSize += moreToCommit;
+                    }
+                }
+            }
+        }
+
+        public void Dispose()
+        {
+            Block.Dispose();
+        }
+    }
+}