Ryujinx/Ryujinx.Memory/MemoryBlock.cs
Mary b4dc33efc2
kernel: Clear pages allocated with SetHeapSize (#2776)
* kernel: Clear pages allocated with SetHeapSize

Before this commit, all new pages allocated by SetHeapSize were not
cleared by the kernel.

This would cause undefined data to be pass to the userland and possibly
resulting in weird memory corruption.

This commit also add support for custom fill heap and ipc value (that is also
supported by the official kernel)

* Remove dots at the end of KPageTableBase.MapPages new documentation

* Remove unused _stackFillValue
2021-10-24 18:52:59 -03:00

388 lines
19 KiB
C#

using System;
using System.Runtime.CompilerServices;
using System.Threading;
namespace Ryujinx.Memory
{
/// <summary>
/// Represents a block of contiguous physical guest memory.
/// </summary>
public sealed class MemoryBlock : IWritableBlock, IDisposable
{
private readonly bool _usesSharedMemory;
private readonly bool _isMirror;
private IntPtr _sharedMemory;
private IntPtr _pointer;
/// <summary>
/// Pointer to the memory block data.
/// </summary>
public IntPtr Pointer => _pointer;
/// <summary>
/// Size of the memory block.
/// </summary>
public ulong Size { get; }
/// <summary>
/// Creates a new instance of the memory block class.
/// </summary>
/// <param name="size">Size of the memory block in bytes</param>
/// <param name="flags">Flags that controls memory block memory allocation</param>
/// <exception cref="OutOfMemoryException">Throw when there's no enough memory to allocate the requested size</exception>
/// <exception cref="PlatformNotSupportedException">Throw when the current platform is not supported</exception>
public MemoryBlock(ulong size, MemoryAllocationFlags flags = MemoryAllocationFlags.None)
{
if (flags.HasFlag(MemoryAllocationFlags.Mirrorable))
{
_sharedMemory = MemoryManagement.CreateSharedMemory(size, flags.HasFlag(MemoryAllocationFlags.Reserve));
_pointer = MemoryManagement.MapSharedMemory(_sharedMemory);
_usesSharedMemory = true;
}
else if (flags.HasFlag(MemoryAllocationFlags.Reserve))
{
_pointer = MemoryManagement.Reserve(size);
}
else
{
_pointer = MemoryManagement.Allocate(size);
}
Size = size;
}
/// <summary>
/// Creates a new instance of the memory block class, with a existing backing storage.
/// </summary>
/// <param name="size">Size of the memory block in bytes</param>
/// <param name="sharedMemory">Shared memory to use as backing storage for this block</param>
/// <exception cref="OutOfMemoryException">Throw when there's no enough address space left to map the shared memory</exception>
/// <exception cref="PlatformNotSupportedException">Throw when the current platform is not supported</exception>
private MemoryBlock(ulong size, IntPtr sharedMemory)
{
_pointer = MemoryManagement.MapSharedMemory(sharedMemory);
Size = size;
_usesSharedMemory = true;
_isMirror = true;
}
/// <summary>
/// Creates a memory block that shares the backing storage with this block.
/// The memory and page commitments will be shared, however memory protections are separate.
/// </summary>
/// <returns>A new memory block that shares storage with this one</returns>
/// <exception cref="NotSupportedException">Throw when the current memory block does not support mirroring</exception>
/// <exception cref="OutOfMemoryException">Throw when there's no enough address space left to map the shared memory</exception>
/// <exception cref="PlatformNotSupportedException">Throw when the current platform is not supported</exception>
public MemoryBlock CreateMirror()
{
if (_sharedMemory == IntPtr.Zero)
{
throw new NotSupportedException("Mirroring is not supported on the memory block because the Mirrorable flag was not set.");
}
return new MemoryBlock(Size, _sharedMemory);
}
/// <summary>
/// Commits a region of memory that has previously been reserved.
/// This can be used to allocate memory on demand.
/// </summary>
/// <param name="offset">Starting offset of the range to be committed</param>
/// <param name="size">Size of the range to be committed</param>
/// <returns>True if the operation was successful, false otherwise</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
public bool Commit(ulong offset, ulong size)
{
return MemoryManagement.Commit(GetPointerInternal(offset, size), size);
}
/// <summary>
/// Decommits a region of memory that has previously been reserved and optionally comitted.
/// This can be used to free previously allocated memory on demand.
/// </summary>
/// <param name="offset">Starting offset of the range to be decommitted</param>
/// <param name="size">Size of the range to be decommitted</param>
/// <returns>True if the operation was successful, false otherwise</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
public bool Decommit(ulong offset, ulong size)
{
return MemoryManagement.Decommit(GetPointerInternal(offset, size), size);
}
/// <summary>
/// Reprotects a region of memory.
/// </summary>
/// <param name="offset">Starting offset of the range to be reprotected</param>
/// <param name="size">Size of the range to be reprotected</param>
/// <param name="permission">New memory permissions</param>
/// <param name="throwOnFail">True if a failed reprotect should throw</param>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
/// <exception cref="MemoryProtectionException">Throw when <paramref name="permission"/> is invalid</exception>
public void Reprotect(ulong offset, ulong size, MemoryPermission permission, bool throwOnFail = true)
{
MemoryManagement.Reprotect(GetPointerInternal(offset, size), size, permission, throwOnFail);
}
/// <summary>
/// Remaps a region of memory into this memory block.
/// </summary>
/// <param name="offset">Starting offset of the range to be remapped into</param>
/// <param name="sourceAddress">Starting offset of the range to be remapped from</param>
/// <param name="size">Size of the range to be remapped</param>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
/// <exception cref="MemoryProtectionException">Throw when <paramref name="permission"/> is invalid</exception>
public void Remap(ulong offset, IntPtr sourceAddress, ulong size)
{
MemoryManagement.Remap(GetPointerInternal(offset, size), sourceAddress, size);
}
/// <summary>
/// Reads bytes from the memory block.
/// </summary>
/// <param name="offset">Starting offset of the range being read</param>
/// <param name="data">Span where the bytes being read will be copied to</param>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified for the the data is out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Read(ulong offset, Span<byte> data)
{
GetSpan(offset, data.Length).CopyTo(data);
}
/// <summary>
/// Reads data from the memory block.
/// </summary>
/// <typeparam name="T">Type of the data</typeparam>
/// <param name="offset">Offset where the data is located</param>
/// <returns>Data at the specified address</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified for the the data is out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public T Read<T>(ulong offset) where T : unmanaged
{
return GetRef<T>(offset);
}
/// <summary>
/// Writes bytes to the memory block.
/// </summary>
/// <param name="offset">Starting offset of the range being written</param>
/// <param name="data">Span where the bytes being written will be copied from</param>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified for the the data is out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Write(ulong offset, ReadOnlySpan<byte> data)
{
data.CopyTo(GetSpan(offset, data.Length));
}
/// <summary>
/// Writes data to the memory block.
/// </summary>
/// <typeparam name="T">Type of the data being written</typeparam>
/// <param name="offset">Offset to write the data into</param>
/// <param name="data">Data to be written</param>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified for the the data is out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Write<T>(ulong offset, T data) where T : unmanaged
{
GetRef<T>(offset) = data;
}
/// <summary>
/// Copies data from one memory location to another.
/// </summary>
/// <param name="dstOffset">Destination offset to write the data into</param>
/// <param name="srcOffset">Source offset to read the data from</param>
/// <param name="size">Size of the copy in bytes</param>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when <paramref name="srcOffset"/>, <paramref name="dstOffset"/> or <paramref name="size"/> is out of range</exception>
public void Copy(ulong dstOffset, ulong srcOffset, ulong size)
{
const int MaxChunkSize = 1 << 24;
for (ulong offset = 0; offset < size; offset += MaxChunkSize)
{
int copySize = (int)Math.Min(MaxChunkSize, size - offset);
Write(dstOffset + offset, GetSpan(srcOffset + offset, copySize));
}
}
/// <summary>
/// Fills a region of memory with <paramref name="value"/>.
/// </summary>
/// <param name="offset">Offset of the region to fill with <paramref name="value"/></param>
/// <param name="size">Size in bytes of the region to fill</param>
/// <param name="value">Value to use for the fill</param>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
public void Fill(ulong offset, ulong size, byte value)
{
const int MaxChunkSize = 1 << 24;
for (ulong subOffset = 0; subOffset < size; subOffset += MaxChunkSize)
{
int copySize = (int)Math.Min(MaxChunkSize, size - subOffset);
GetSpan(offset + subOffset, copySize).Fill(value);
}
}
/// <summary>
/// Gets a reference of the data at a given memory block region.
/// </summary>
/// <typeparam name="T">Data type</typeparam>
/// <param name="offset">Offset of the memory region</param>
/// <returns>A reference to the given memory region data</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public unsafe ref T GetRef<T>(ulong offset) where T : unmanaged
{
IntPtr ptr = _pointer;
if (ptr == IntPtr.Zero)
{
ThrowObjectDisposed();
}
int size = Unsafe.SizeOf<T>();
ulong endOffset = offset + (ulong)size;
if (endOffset > Size || endOffset < offset)
{
ThrowInvalidMemoryRegionException();
}
return ref Unsafe.AsRef<T>((void*)PtrAddr(ptr, offset));
}
/// <summary>
/// Gets the pointer of a given memory block region.
/// </summary>
/// <param name="offset">Start offset of the memory region</param>
/// <param name="size">Size in bytes of the region</param>
/// <returns>The pointer to the memory region</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public nuint GetPointer(ulong offset, ulong size) => (nuint)(ulong)GetPointerInternal(offset, size);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private IntPtr GetPointerInternal(ulong offset, ulong size)
{
IntPtr ptr = _pointer;
if (ptr == IntPtr.Zero)
{
ThrowObjectDisposed();
}
ulong endOffset = offset + size;
if (endOffset > Size || endOffset < offset)
{
ThrowInvalidMemoryRegionException();
}
return PtrAddr(ptr, offset);
}
/// <summary>
/// Gets the <see cref="Span{T}"/> of a given memory block region.
/// </summary>
/// <param name="offset">Start offset of the memory region</param>
/// <param name="size">Size in bytes of the region</param>
/// <returns>Span of the memory region</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public unsafe Span<byte> GetSpan(ulong offset, int size)
{
return new Span<byte>((void*)GetPointerInternal(offset, (ulong)size), size);
}
/// <summary>
/// Gets the <see cref="Memory{T}"/> of a given memory block region.
/// </summary>
/// <param name="offset">Start offset of the memory region</param>
/// <param name="size">Size in bytes of the region</param>
/// <returns>Memory of the memory region</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public unsafe Memory<byte> GetMemory(ulong offset, int size)
{
return new NativeMemoryManager<byte>((byte*)GetPointerInternal(offset, (ulong)size), size).Memory;
}
/// <summary>
/// Gets a writable region of a given memory block region.
/// </summary>
/// <param name="offset">Start offset of the memory region</param>
/// <param name="size">Size in bytes of the region</param>
/// <returns>Writable region of the memory region</returns>
/// <exception cref="ObjectDisposedException">Throw when the memory block has already been disposed</exception>
/// <exception cref="InvalidMemoryRegionException">Throw when either <paramref name="offset"/> or <paramref name="size"/> are out of range</exception>
public WritableRegion GetWritableRegion(ulong offset, int size)
{
return new WritableRegion(null, offset, GetMemory(offset, size));
}
/// <summary>
/// Adds a 64-bits offset to a native pointer.
/// </summary>
/// <param name="pointer">Native pointer</param>
/// <param name="offset">Offset to add</param>
/// <returns>Native pointer with the added offset</returns>
private IntPtr PtrAddr(IntPtr pointer, ulong offset)
{
return (IntPtr)(pointer.ToInt64() + (long)offset);
}
/// <summary>
/// Frees the memory allocated for this memory block.
/// </summary>
/// <remarks>
/// It's an error to use the memory block after disposal.
/// </remarks>
public void Dispose() => FreeMemory();
~MemoryBlock() => FreeMemory();
private void FreeMemory()
{
IntPtr ptr = Interlocked.Exchange(ref _pointer, IntPtr.Zero);
// If pointer is null, the memory was already freed or never allocated.
if (ptr != IntPtr.Zero)
{
if (_usesSharedMemory)
{
MemoryManagement.UnmapSharedMemory(ptr);
if (_sharedMemory != IntPtr.Zero && !_isMirror)
{
MemoryManagement.DestroySharedMemory(_sharedMemory);
_sharedMemory = IntPtr.Zero;
}
}
else
{
MemoryManagement.Free(ptr);
}
}
}
private void ThrowObjectDisposed() => throw new ObjectDisposedException(nameof(MemoryBlock));
private void ThrowInvalidMemoryRegionException() => throw new InvalidMemoryRegionException();
}
}