mirror of
https://github.com/ryujinx-mirror/ryujinx.git
synced 2024-12-23 16:05:46 +00:00
9f6b24edfd
* Implement session count decrement when the handle is closed * Remove unused field * Implement SendSyncRequestWithUserBuffer, SendAsyncRequestWithUserBuffer and ReplyAndReceiveWithUserBuffer syscalls * Nits * Fix swapped copy dst/src * Add missing pointer buffer descriptor write on reply * Fix IPC unaligned buffer copy and restoring client attributes on reply * Oops * Fix SetIpcMappingPermission * Fix unaligned copy bugs * Free memory used for temporary IPC buffers
290 lines
13 KiB
C#
290 lines
13 KiB
C#
using System;
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using System.Runtime.CompilerServices;
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using System.Threading;
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namespace Ryujinx.Memory
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{
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/// <summary>
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/// Represents a block of contiguous physical guest memory.
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/// </summary>
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public sealed class MemoryBlock : IDisposable
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{
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private IntPtr _pointer;
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/// <summary>
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/// Pointer to the memory block data.
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/// </summary>
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public IntPtr Pointer => _pointer;
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/// <summary>
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/// Size of the memory block.
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/// </summary>
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public ulong Size { get; }
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/// <summary>
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/// Initializes a new instance of the memory block class.
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/// </summary>
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/// <param name="size">Size of the memory block</param>
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/// <param name="flags">Flags that control memory block memory allocation</param>
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/// <exception cref="OutOfMemoryException">Throw when there's no enough memory to allocate the requested size</exception>
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/// <exception cref="PlatformNotSupportedException">Throw when the current platform is not supported</exception>
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public MemoryBlock(ulong size, MemoryAllocationFlags flags = MemoryAllocationFlags.None)
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{
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if (flags.HasFlag(MemoryAllocationFlags.Reserve))
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{
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_pointer = MemoryManagement.Reserve(size);
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}
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else
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{
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_pointer = MemoryManagement.Allocate(size);
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}
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Size = size;
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}
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/// <summary>
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/// Commits a region of memory that has previously been reserved.
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/// This can be used to allocate memory on demand.
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/// </summary>
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/// <param name="offset">Starting offset of the range to be committed</param>
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/// <param name="size">Size of the range to be committed</param>
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/// <returns>True if the operation was successful, false otherwise</returns>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
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public bool Commit(ulong offset, ulong size)
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{
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return MemoryManagement.Commit(GetPointerInternal(offset, size), size);
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}
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/// <summary>
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/// Reprotects a region of memory.
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/// </summary>
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/// <param name="offset">Starting offset of the range to be reprotected</param>
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/// <param name="size">Size of the range to be reprotected</param>
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/// <param name="permission">New memory permissions</param>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
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/// <exception cref="MemoryProtectionException">Throw when <paramref name="permission"/> is invalid</exception>
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public void Reprotect(ulong offset, ulong size, MemoryPermission permission)
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{
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MemoryManagement.Reprotect(GetPointerInternal(offset, size), size, permission);
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}
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/// <summary>
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/// Reads bytes from the memory block.
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/// </summary>
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/// <param name="offset">Starting offset of the range being read</param>
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/// <param name="data">Span where the bytes being read will be copied to</param>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when the memory region specified for the the data is out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public void Read(ulong offset, Span<byte> data)
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{
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GetSpan(offset, data.Length).CopyTo(data);
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}
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/// <summary>
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/// Reads data from the memory block.
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/// </summary>
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/// <typeparam name="T">Type of the data</typeparam>
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/// <param name="offset">Offset where the data is located</param>
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/// <returns>Data at the specified address</returns>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when the memory region specified for the the data is out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public T Read<T>(ulong offset) where T : unmanaged
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{
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return GetRef<T>(offset);
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}
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/// <summary>
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/// Writes bytes to the memory block.
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/// </summary>
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/// <param name="offset">Starting offset of the range being written</param>
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/// <param name="data">Span where the bytes being written will be copied from</param>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when the memory region specified for the the data is out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public void Write(ulong offset, ReadOnlySpan<byte> data)
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{
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data.CopyTo(GetSpan(offset, data.Length));
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}
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/// <summary>
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/// Writes data to the memory block.
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/// </summary>
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/// <typeparam name="T">Type of the data being written</typeparam>
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/// <param name="offset">Offset to write the data into</param>
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/// <param name="data">Data to be written</param>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when the memory region specified for the the data is out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public void Write<T>(ulong offset, T data) where T : unmanaged
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{
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GetRef<T>(offset) = data;
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}
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/// <summary>
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/// Copies data from one memory location to another.
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/// </summary>
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/// <param name="dstOffset">Destination offset to write the data into</param>
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/// <param name="srcOffset">Source offset to read the data from</param>
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/// <param name="size">Size of the copy in bytes</param>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when <paramref name="srcOffset"/>, <paramref name="dstOffset"/> or <paramref name="size"/> is out of range</exception>
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public void Copy(ulong dstOffset, ulong srcOffset, ulong size)
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{
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const int MaxChunkSize = 1 << 30;
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for (ulong offset = 0; offset < size; offset += MaxChunkSize)
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{
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int copySize = (int)Math.Min(MaxChunkSize, size - offset);
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Write(dstOffset + offset, GetSpan(srcOffset + offset, copySize));
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}
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}
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/// <summary>
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/// Fills a region of memory with zeros.
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/// </summary>
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/// <param name="offset">Offset of the region to fill with zeros</param>
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/// <param name="size">Size in bytes of the region to fill</param>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
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public void ZeroFill(ulong offset, ulong size)
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{
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const int MaxChunkSize = 1 << 30;
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for (ulong subOffset = 0; subOffset < size; subOffset += MaxChunkSize)
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{
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int copySize = (int)Math.Min(MaxChunkSize, size - subOffset);
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GetSpan(offset + subOffset, copySize).Fill(0);
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}
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}
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/// <summary>
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/// Gets a reference of the data at a given memory block region.
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/// </summary>
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/// <typeparam name="T">Data type</typeparam>
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/// <param name="offset">Offset of the memory region</param>
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/// <returns>A reference to the given memory region data</returns>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public unsafe ref T GetRef<T>(ulong offset) where T : unmanaged
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{
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IntPtr ptr = _pointer;
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if (ptr == IntPtr.Zero)
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{
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ThrowObjectDisposed();
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}
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int size = Unsafe.SizeOf<T>();
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ulong endOffset = offset + (ulong)size;
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if (endOffset > Size || endOffset < offset)
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{
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ThrowArgumentOutOfRange();
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}
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return ref Unsafe.AsRef<T>((void*)PtrAddr(ptr, offset));
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}
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/// <summary>
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/// Gets the pointer of a given memory block region.
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/// </summary>
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/// <param name="offset">Start offset of the memory region</param>
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/// <param name="size">Size in bytes of the region</param>
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/// <returns>The pointer to the memory region</returns>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public IntPtr GetPointer(ulong offset, int size) => GetPointerInternal(offset, (ulong)size);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private IntPtr GetPointerInternal(ulong offset, ulong size)
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{
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IntPtr ptr = _pointer;
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if (ptr == IntPtr.Zero)
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{
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ThrowObjectDisposed();
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}
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ulong endOffset = offset + size;
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if (endOffset > Size || endOffset < offset)
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{
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ThrowArgumentOutOfRange();
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}
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return PtrAddr(ptr, offset);
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}
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/// <summary>
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/// Gets the <see cref="System.Span{T}"/> of a given memory block region.
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/// </summary>
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/// <param name="offset">Start offset of the memory region</param>
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/// <param name="size">Size in bytes of the region</param>
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/// <returns>Span of the memory region</returns>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public unsafe Span<byte> GetSpan(ulong offset, int size)
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{
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return new Span<byte>((void*)GetPointer(offset, size), size);
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}
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/// <summary>
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/// Gets the <see cref="System.Memory{T}"/> of a given memory block region.
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/// </summary>
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/// <param name="offset">Start offset of the memory region</param>
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/// <param name="size">Size in bytes of the region</param>
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/// <returns>Memory of the memory region</returns>
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/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
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/// <exception cref="ArgumentOutOfRangeException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public unsafe Memory<byte> GetMemory(ulong offset, int size)
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{
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return new NativeMemoryManager<byte>((byte*)GetPointer(offset, size), size).Memory;
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}
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/// <summary>
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/// Adds a 64-bits offset to a native pointer.
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/// </summary>
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/// <param name="pointer">Native pointer</param>
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/// <param name="offset">Offset to add</param>
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/// <returns>Native pointer with the added offset</returns>
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private IntPtr PtrAddr(IntPtr pointer, ulong offset)
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{
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return (IntPtr)(pointer.ToInt64() + (long)offset);
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}
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/// <summary>
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/// Frees the memory allocated for this memory block.
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/// </summary>
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/// <remarks>
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/// It's an error to use the memory block after disposal.
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/// </remarks>
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public void Dispose() => FreeMemory();
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~MemoryBlock() => FreeMemory();
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private void FreeMemory()
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{
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IntPtr ptr = Interlocked.Exchange(ref _pointer, IntPtr.Zero);
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// If pointer is null, the memory was already freed or never allocated.
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if (ptr != IntPtr.Zero)
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{
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MemoryManagement.Free(ptr);
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}
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}
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private void ThrowObjectDisposed() => throw new ObjectDisposedException(nameof(MemoryBlock));
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private void ThrowArgumentOutOfRange() => throw new ArgumentOutOfRangeException();
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}
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}
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