forked from Mirror/Ryujinx
780 lines
26 KiB
C#
780 lines
26 KiB
C#
using ARMeilleure.Memory;
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using Ryujinx.Cpu.Tracking;
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using Ryujinx.Memory;
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using Ryujinx.Memory.Range;
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using Ryujinx.Memory.Tracking;
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using System;
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using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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using System.Threading;
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namespace Ryujinx.Cpu.Jit
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{
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/// <summary>
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/// Represents a CPU memory manager which maps guest virtual memory directly onto a host virtual region.
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/// </summary>
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public sealed class MemoryManagerHostMapped : MemoryManagerBase, IMemoryManager, IVirtualMemoryManagerTracked, IWritableBlock
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{
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public const int PageBits = 12;
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public const int PageSize = 1 << PageBits;
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public const int PageMask = PageSize - 1;
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public const int PageToPteShift = 5; // 32 pages (2 bits each) in one ulong page table entry.
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public const ulong BlockMappedMask = 0x5555555555555555; // First bit of each table entry set.
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private enum HostMappedPtBits : ulong
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{
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Unmapped = 0,
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Mapped,
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WriteTracked,
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ReadWriteTracked,
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MappedReplicated = 0x5555555555555555,
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WriteTrackedReplicated = 0xaaaaaaaaaaaaaaaa,
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ReadWriteTrackedReplicated = ulong.MaxValue
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}
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private readonly InvalidAccessHandler _invalidAccessHandler;
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private readonly bool _unsafeMode;
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private readonly MemoryBlock _addressSpace;
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private readonly MemoryBlock _addressSpaceMirror;
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private readonly ulong _addressSpaceSize;
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private readonly MemoryBlock _backingMemory;
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private readonly PageTable<ulong> _pageTable;
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private readonly MemoryEhMeilleure _memoryEh;
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private readonly ulong[] _pageBitmap;
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public int AddressSpaceBits { get; }
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public IntPtr PageTablePointer => _addressSpace.Pointer;
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public MemoryManagerType Type => _unsafeMode ? MemoryManagerType.HostMappedUnsafe : MemoryManagerType.HostMapped;
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public MemoryTracking Tracking { get; }
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public event Action<ulong, ulong> UnmapEvent;
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/// <summary>
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/// Creates a new instance of the host mapped memory manager.
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/// </summary>
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/// <param name="backingMemory">Physical backing memory where virtual memory will be mapped to</param>
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/// <param name="addressSpaceSize">Size of the address space</param>
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/// <param name="unsafeMode">True if unmanaged access should not be masked (unsafe), false otherwise.</param>
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/// <param name="invalidAccessHandler">Optional function to handle invalid memory accesses</param>
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public MemoryManagerHostMapped(MemoryBlock backingMemory, ulong addressSpaceSize, bool unsafeMode, InvalidAccessHandler invalidAccessHandler = null)
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{
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_backingMemory = backingMemory;
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_pageTable = new PageTable<ulong>();
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_invalidAccessHandler = invalidAccessHandler;
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_unsafeMode = unsafeMode;
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_addressSpaceSize = addressSpaceSize;
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ulong asSize = PageSize;
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int asBits = PageBits;
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while (asSize < addressSpaceSize)
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{
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asSize <<= 1;
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asBits++;
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}
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AddressSpaceBits = asBits;
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_pageBitmap = new ulong[1 << (AddressSpaceBits - (PageBits + PageToPteShift))];
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MemoryAllocationFlags asFlags = MemoryAllocationFlags.Reserve | MemoryAllocationFlags.ViewCompatible;
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_addressSpace = new MemoryBlock(asSize, asFlags);
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_addressSpaceMirror = new MemoryBlock(asSize, asFlags);
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Tracking = new MemoryTracking(this, PageSize, invalidAccessHandler);
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_memoryEh = new MemoryEhMeilleure(_addressSpace, _addressSpaceMirror, Tracking);
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}
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/// <summary>
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/// Checks if the virtual address is part of the addressable space.
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/// </summary>
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/// <param name="va">Virtual address</param>
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/// <returns>True if the virtual address is part of the addressable space</returns>
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private bool ValidateAddress(ulong va)
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{
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return va < _addressSpaceSize;
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}
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/// <summary>
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/// Checks if the combination of virtual address and size is part of the addressable space.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range in bytes</param>
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/// <returns>True if the combination of virtual address and size is part of the addressable space</returns>
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private bool ValidateAddressAndSize(ulong va, ulong size)
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{
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ulong endVa = va + size;
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return endVa >= va && endVa >= size && endVa <= _addressSpaceSize;
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}
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/// <summary>
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/// Ensures the combination of virtual address and size is part of the addressable space.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range in bytes</param>
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/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified outside the addressable space</exception>
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private void AssertValidAddressAndSize(ulong va, ulong size)
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{
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if (!ValidateAddressAndSize(va, size))
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{
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throw new InvalidMemoryRegionException($"va=0x{va:X16}, size=0x{size:X16}");
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}
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}
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/// <summary>
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/// Ensures the combination of virtual address and size is part of the addressable space and fully mapped.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range in bytes</param>
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private void AssertMapped(ulong va, ulong size)
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{
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if (!ValidateAddressAndSize(va, size) || !IsRangeMappedImpl(va, size))
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{
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throw new InvalidMemoryRegionException($"Not mapped: va=0x{va:X16}, size=0x{size:X16}");
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}
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}
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/// <inheritdoc/>
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public void Map(ulong va, ulong pa, ulong size)
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{
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AssertValidAddressAndSize(va, size);
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_addressSpace.MapView(_backingMemory, pa, va, size);
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_addressSpaceMirror.MapView(_backingMemory, pa, va, size);
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AddMapping(va, size);
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PtMap(va, pa, size);
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Tracking.Map(va, size);
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}
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/// <inheritdoc/>
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public void Unmap(ulong va, ulong size)
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{
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AssertValidAddressAndSize(va, size);
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UnmapEvent?.Invoke(va, size);
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Tracking.Unmap(va, size);
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RemoveMapping(va, size);
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PtUnmap(va, size);
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_addressSpace.UnmapView(_backingMemory, va, size);
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_addressSpaceMirror.UnmapView(_backingMemory, va, size);
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}
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private void PtMap(ulong va, ulong pa, ulong size)
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{
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while (size != 0)
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{
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_pageTable.Map(va, pa);
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va += PageSize;
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pa += PageSize;
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size -= PageSize;
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}
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}
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private void PtUnmap(ulong va, ulong size)
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{
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while (size != 0)
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{
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_pageTable.Unmap(va);
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va += PageSize;
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size -= PageSize;
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}
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}
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/// <inheritdoc/>
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public T Read<T>(ulong va) where T : unmanaged
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{
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try
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{
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AssertMapped(va, (ulong)Unsafe.SizeOf<T>());
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return _addressSpaceMirror.Read<T>(va);
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}
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catch (InvalidMemoryRegionException)
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{
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if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
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{
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throw;
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}
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return default;
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}
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}
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/// <inheritdoc/>
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public T ReadTracked<T>(ulong va) where T : unmanaged
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{
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try
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{
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SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), false);
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return Read<T>(va);
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}
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catch (InvalidMemoryRegionException)
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{
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if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
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{
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throw;
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}
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return default;
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}
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}
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/// <inheritdoc/>
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public void Read(ulong va, Span<byte> data)
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{
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try
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{
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AssertMapped(va, (ulong)data.Length);
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_addressSpaceMirror.Read(va, data);
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}
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catch (InvalidMemoryRegionException)
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{
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if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
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{
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throw;
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}
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}
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}
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/// <inheritdoc/>
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public void Write<T>(ulong va, T value) where T : unmanaged
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{
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try
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{
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SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), write: true);
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_addressSpaceMirror.Write(va, value);
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}
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catch (InvalidMemoryRegionException)
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{
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if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
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{
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throw;
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}
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}
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}
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/// <inheritdoc/>
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public void Write(ulong va, ReadOnlySpan<byte> data)
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{
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try
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{
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SignalMemoryTracking(va, (ulong)data.Length, write: true);
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_addressSpaceMirror.Write(va, data);
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}
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catch (InvalidMemoryRegionException)
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{
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if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
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{
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throw;
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}
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}
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}
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/// <inheritdoc/>
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public void WriteUntracked(ulong va, ReadOnlySpan<byte> data)
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{
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try
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{
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AssertMapped(va, (ulong)data.Length);
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_addressSpaceMirror.Write(va, data);
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}
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catch (InvalidMemoryRegionException)
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{
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if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
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{
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throw;
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}
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}
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}
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/// <inheritdoc/>
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public ReadOnlySpan<byte> GetSpan(ulong va, int size, bool tracked = false)
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{
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if (tracked)
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{
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SignalMemoryTracking(va, (ulong)size, write: false);
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}
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else
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{
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AssertMapped(va, (ulong)size);
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}
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return _addressSpaceMirror.GetSpan(va, size);
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}
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/// <inheritdoc/>
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public WritableRegion GetWritableRegion(ulong va, int size, bool tracked = false)
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{
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if (tracked)
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{
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SignalMemoryTracking(va, (ulong)size, true);
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}
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else
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{
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AssertMapped(va, (ulong)size);
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}
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return _addressSpaceMirror.GetWritableRegion(va, size);
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}
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/// <inheritdoc/>
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public ref T GetRef<T>(ulong va) where T : unmanaged
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{
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SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), true);
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return ref _addressSpaceMirror.GetRef<T>(va);
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}
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/// <inheritdoc/>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public bool IsMapped(ulong va)
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{
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return ValidateAddress(va) && IsMappedImpl(va);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private bool IsMappedImpl(ulong va)
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{
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ulong page = va >> PageBits;
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int bit = (int)((page & 31) << 1);
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int pageIndex = (int)(page >> PageToPteShift);
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ref ulong pageRef = ref _pageBitmap[pageIndex];
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ulong pte = Volatile.Read(ref pageRef);
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return ((pte >> bit) & 3) != 0;
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}
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/// <inheritdoc/>
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public bool IsRangeMapped(ulong va, ulong size)
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{
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AssertValidAddressAndSize(va, size);
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return IsRangeMappedImpl(va, size);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private void GetPageBlockRange(ulong pageStart, ulong pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex)
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{
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startMask = ulong.MaxValue << ((int)(pageStart & 31) << 1);
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endMask = ulong.MaxValue >> (64 - ((int)(pageEnd & 31) << 1));
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pageIndex = (int)(pageStart >> PageToPteShift);
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pageEndIndex = (int)((pageEnd - 1) >> PageToPteShift);
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}
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private bool IsRangeMappedImpl(ulong va, ulong size)
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{
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int pages = GetPagesCount(va, size, out _);
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if (pages == 1)
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{
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return IsMappedImpl(va);
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}
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ulong pageStart = va >> PageBits;
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ulong pageEnd = pageStart + (ulong)pages;
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GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
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// Check if either bit in each 2 bit page entry is set.
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// OR the block with itself shifted down by 1, and check the first bit of each entry.
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ulong mask = BlockMappedMask & startMask;
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while (pageIndex <= pageEndIndex)
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{
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if (pageIndex == pageEndIndex)
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{
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mask &= endMask;
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}
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ref ulong pageRef = ref _pageBitmap[pageIndex++];
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ulong pte = Volatile.Read(ref pageRef);
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pte |= pte >> 1;
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if ((pte & mask) != mask)
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{
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return false;
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}
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mask = BlockMappedMask;
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}
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return true;
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}
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/// <inheritdoc/>
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public IEnumerable<MemoryRange> GetPhysicalRegions(ulong va, ulong size)
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{
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int pages = GetPagesCount(va, (uint)size, out va);
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var regions = new List<MemoryRange>();
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ulong regionStart = GetPhysicalAddressChecked(va);
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ulong regionSize = PageSize;
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for (int page = 0; page < pages - 1; page++)
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{
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if (!ValidateAddress(va + PageSize))
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{
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return null;
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}
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ulong newPa = GetPhysicalAddressChecked(va + PageSize);
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if (GetPhysicalAddressChecked(va) + PageSize != newPa)
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{
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regions.Add(new MemoryRange(regionStart, regionSize));
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regionStart = newPa;
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regionSize = 0;
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}
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va += PageSize;
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regionSize += PageSize;
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}
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regions.Add(new MemoryRange(regionStart, regionSize));
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return regions;
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}
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private ulong GetPhysicalAddressChecked(ulong va)
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{
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if (!IsMapped(va))
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{
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ThrowInvalidMemoryRegionException($"Not mapped: va=0x{va:X16}");
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}
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return GetPhysicalAddressInternal(va);
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}
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private ulong GetPhysicalAddressInternal(ulong va)
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{
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return _pageTable.Read(va) + (va & PageMask);
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}
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/// <inheritdoc/>
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/// <remarks>
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/// This function also validates that the given range is both valid and mapped, and will throw if it is not.
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/// </remarks>
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public void SignalMemoryTracking(ulong va, ulong size, bool write, bool precise = false)
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{
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AssertValidAddressAndSize(va, size);
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if (precise)
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{
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Tracking.VirtualMemoryEvent(va, size, write, precise: true);
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return;
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}
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// Software table, used for managed memory tracking.
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int pages = GetPagesCount(va, size, out _);
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ulong pageStart = va >> PageBits;
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if (pages == 1)
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{
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ulong tag = (ulong)(write ? HostMappedPtBits.WriteTracked : HostMappedPtBits.ReadWriteTracked);
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int bit = (int)((pageStart & 31) << 1);
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int pageIndex = (int)(pageStart >> PageToPteShift);
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ref ulong pageRef = ref _pageBitmap[pageIndex];
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ulong pte = Volatile.Read(ref pageRef);
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ulong state = ((pte >> bit) & 3);
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if (state >= tag)
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{
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Tracking.VirtualMemoryEvent(va, size, write);
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return;
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}
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else if (state == 0)
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{
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ThrowInvalidMemoryRegionException($"Not mapped: va=0x{va:X16}, size=0x{size:X16}");
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}
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}
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else
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{
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ulong pageEnd = pageStart + (ulong)pages;
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GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
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ulong mask = startMask;
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ulong anyTrackingTag = (ulong)HostMappedPtBits.WriteTrackedReplicated;
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while (pageIndex <= pageEndIndex)
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{
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if (pageIndex == pageEndIndex)
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{
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mask &= endMask;
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}
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ref ulong pageRef = ref _pageBitmap[pageIndex++];
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ulong pte = Volatile.Read(ref pageRef);
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ulong mappedMask = mask & BlockMappedMask;
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ulong mappedPte = pte | (pte >> 1);
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if ((mappedPte & mappedMask) != mappedMask)
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{
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ThrowInvalidMemoryRegionException($"Not mapped: va=0x{va:X16}, size=0x{size:X16}");
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}
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pte &= mask;
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if ((pte & anyTrackingTag) != 0) // Search for any tracking.
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{
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// Writes trigger any tracking.
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// Only trigger tracking from reads if both bits are set on any page.
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if (write || (pte & (pte >> 1) & BlockMappedMask) != 0)
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{
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Tracking.VirtualMemoryEvent(va, size, write);
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break;
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}
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}
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mask = ulong.MaxValue;
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}
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}
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}
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/// <summary>
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/// Computes the number of pages in a virtual address range.
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/// </summary>
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/// <param name="va">Virtual address of the range</param>
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/// <param name="size">Size of the range</param>
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/// <param name="startVa">The virtual address of the beginning of the first page</param>
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/// <remarks>This function does not differentiate between allocated and unallocated pages.</remarks>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private int GetPagesCount(ulong va, ulong size, out ulong startVa)
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{
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// WARNING: Always check if ulong does not overflow during the operations.
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startVa = va & ~(ulong)PageMask;
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ulong vaSpan = (va - startVa + size + PageMask) & ~(ulong)PageMask;
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return (int)(vaSpan / PageSize);
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}
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/// <inheritdoc/>
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public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection)
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{
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// Protection is inverted on software pages, since the default value is 0.
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protection = (~protection) & MemoryPermission.ReadAndWrite;
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int pages = GetPagesCount(va, size, out va);
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ulong pageStart = va >> PageBits;
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if (pages == 1)
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{
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ulong protTag = protection switch
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{
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MemoryPermission.None => (ulong)HostMappedPtBits.Mapped,
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MemoryPermission.Write => (ulong)HostMappedPtBits.WriteTracked,
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_ => (ulong)HostMappedPtBits.ReadWriteTracked,
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};
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int bit = (int)((pageStart & 31) << 1);
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ulong tagMask = 3UL << bit;
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ulong invTagMask = ~tagMask;
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ulong tag = protTag << bit;
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int pageIndex = (int)(pageStart >> PageToPteShift);
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ref ulong pageRef = ref _pageBitmap[pageIndex];
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ulong pte;
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do
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{
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pte = Volatile.Read(ref pageRef);
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}
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while ((pte & tagMask) != 0 && Interlocked.CompareExchange(ref pageRef, (pte & invTagMask) | tag, pte) != pte);
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}
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else
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{
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ulong pageEnd = pageStart + (ulong)pages;
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GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
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ulong mask = startMask;
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ulong protTag = protection switch
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{
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MemoryPermission.None => (ulong)HostMappedPtBits.MappedReplicated,
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MemoryPermission.Write => (ulong)HostMappedPtBits.WriteTrackedReplicated,
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_ => (ulong)HostMappedPtBits.ReadWriteTrackedReplicated,
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};
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while (pageIndex <= pageEndIndex)
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{
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if (pageIndex == pageEndIndex)
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{
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mask &= endMask;
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}
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ref ulong pageRef = ref _pageBitmap[pageIndex++];
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ulong pte;
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ulong mappedMask;
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// Change the protection of all 2 bit entries that are mapped.
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do
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{
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pte = Volatile.Read(ref pageRef);
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mappedMask = pte | (pte >> 1);
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mappedMask |= (mappedMask & BlockMappedMask) << 1;
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mappedMask &= mask; // Only update mapped pages within the given range.
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}
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while (Interlocked.CompareExchange(ref pageRef, (pte & (~mappedMask)) | (protTag & mappedMask), pte) != pte);
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mask = ulong.MaxValue;
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}
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}
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|
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protection = protection switch
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|
{
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|
MemoryPermission.None => MemoryPermission.ReadAndWrite,
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MemoryPermission.Write => MemoryPermission.Read,
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_ => MemoryPermission.None
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|
};
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|
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_addressSpace.Reprotect(va, size, protection, false);
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}
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/// <inheritdoc/>
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public CpuRegionHandle BeginTracking(ulong address, ulong size)
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|
{
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return new CpuRegionHandle(Tracking.BeginTracking(address, size));
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|
}
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|
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|
/// <inheritdoc/>
|
|
public CpuMultiRegionHandle BeginGranularTracking(ulong address, ulong size, IEnumerable<IRegionHandle> handles, ulong granularity)
|
|
{
|
|
return new CpuMultiRegionHandle(Tracking.BeginGranularTracking(address, size, handles, granularity));
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public CpuSmartMultiRegionHandle BeginSmartGranularTracking(ulong address, ulong size, ulong granularity)
|
|
{
|
|
return new CpuSmartMultiRegionHandle(Tracking.BeginSmartGranularTracking(address, size, granularity));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds the given address mapping to the page table.
|
|
/// </summary>
|
|
/// <param name="va">Virtual memory address</param>
|
|
/// <param name="size">Size to be mapped</param>
|
|
private void AddMapping(ulong va, ulong size)
|
|
{
|
|
int pages = GetPagesCount(va, size, out _);
|
|
ulong pageStart = va >> PageBits;
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|
ulong pageEnd = pageStart + (ulong)pages;
|
|
|
|
GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
|
|
|
|
ulong mask = startMask;
|
|
|
|
while (pageIndex <= pageEndIndex)
|
|
{
|
|
if (pageIndex == pageEndIndex)
|
|
{
|
|
mask &= endMask;
|
|
}
|
|
|
|
ref ulong pageRef = ref _pageBitmap[pageIndex++];
|
|
|
|
ulong pte;
|
|
ulong mappedMask;
|
|
|
|
// Map all 2-bit entries that are unmapped.
|
|
do
|
|
{
|
|
pte = Volatile.Read(ref pageRef);
|
|
|
|
mappedMask = pte | (pte >> 1);
|
|
mappedMask |= (mappedMask & BlockMappedMask) << 1;
|
|
mappedMask |= ~mask; // Treat everything outside the range as mapped, thus unchanged.
|
|
}
|
|
while (Interlocked.CompareExchange(ref pageRef, (pte & mappedMask) | (BlockMappedMask & (~mappedMask)), pte) != pte);
|
|
|
|
mask = ulong.MaxValue;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Removes the given address mapping from the page table.
|
|
/// </summary>
|
|
/// <param name="va">Virtual memory address</param>
|
|
/// <param name="size">Size to be unmapped</param>
|
|
private void RemoveMapping(ulong va, ulong size)
|
|
{
|
|
int pages = GetPagesCount(va, size, out _);
|
|
ulong pageStart = va >> PageBits;
|
|
ulong pageEnd = pageStart + (ulong)pages;
|
|
|
|
GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
|
|
|
|
startMask = ~startMask;
|
|
endMask = ~endMask;
|
|
|
|
ulong mask = startMask;
|
|
|
|
while (pageIndex <= pageEndIndex)
|
|
{
|
|
if (pageIndex == pageEndIndex)
|
|
{
|
|
mask |= endMask;
|
|
}
|
|
|
|
ref ulong pageRef = ref _pageBitmap[pageIndex++];
|
|
ulong pte;
|
|
|
|
do
|
|
{
|
|
pte = Volatile.Read(ref pageRef);
|
|
}
|
|
while (Interlocked.CompareExchange(ref pageRef, pte & mask, pte) != pte);
|
|
|
|
mask = 0;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Disposes of resources used by the memory manager.
|
|
/// </summary>
|
|
protected override void Destroy()
|
|
{
|
|
_addressSpace.Dispose();
|
|
_addressSpaceMirror.Dispose();
|
|
_memoryEh.Dispose();
|
|
}
|
|
|
|
private static void ThrowInvalidMemoryRegionException(string message) => throw new InvalidMemoryRegionException(message);
|
|
}
|
|
}
|