forked from Mirror/Ryujinx
4b60371e64
* Return mapped buffer pointer directly for flush, WriteableRegion for textures A few changes here to generally improve performance, even for platforms not using the persistent buffer flush. - Texture and buffer flush now return a ReadOnlySpan<byte>. It's guaranteed that this span is pinned in memory, but it will be overwritten on the next flush from that thread, so it is expected that the data is used before calling again. - As a result, persistent mappings no longer copy to a new array - rather the persistent map is returned directly as a Span<>. A similar host array is used for the glGet flushes instead of allocating new arrays each time. - Texture flushes now do their layout conversion into a WriteableRegion when the texture is not MultiRange, which allows the flush to happen directly into guest memory rather than into a temporary span, then copied over. This avoids another copy when doing layout conversion. Overall, this saves 1 data copy for buffer flush, 1 copy for linear textures with matching source/target stride, and 2 copies for block textures or linear textures with mismatching strides. * Fix tests * Fix array pointer for Mesa/Intel path * Address some feedback * Update method for getting array pointer.
699 lines
24 KiB
C#
699 lines
24 KiB
C#
using ARMeilleure.Memory;
|
|
using Ryujinx.Cpu.Tracking;
|
|
using Ryujinx.Memory;
|
|
using Ryujinx.Memory.Range;
|
|
using Ryujinx.Memory.Tracking;
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Runtime.CompilerServices;
|
|
using System.Threading;
|
|
|
|
namespace Ryujinx.Cpu
|
|
{
|
|
/// <summary>
|
|
/// Represents a CPU memory manager which maps guest virtual memory directly onto a host virtual region.
|
|
/// </summary>
|
|
public class MemoryManagerHostMapped : MemoryManagerBase, IMemoryManager, IVirtualMemoryManagerTracked
|
|
{
|
|
public const int PageBits = 12;
|
|
public const int PageSize = 1 << PageBits;
|
|
public const int PageMask = PageSize - 1;
|
|
|
|
public const int PageToPteShift = 5; // 32 pages (2 bits each) in one ulong page table entry.
|
|
public const ulong BlockMappedMask = 0x5555555555555555; // First bit of each table entry set.
|
|
|
|
private enum HostMappedPtBits : ulong
|
|
{
|
|
Unmapped = 0,
|
|
Mapped,
|
|
WriteTracked,
|
|
ReadWriteTracked,
|
|
|
|
MappedReplicated = 0x5555555555555555,
|
|
WriteTrackedReplicated = 0xaaaaaaaaaaaaaaaa,
|
|
ReadWriteTrackedReplicated = ulong.MaxValue
|
|
}
|
|
|
|
private readonly InvalidAccessHandler _invalidAccessHandler;
|
|
private readonly bool _unsafeMode;
|
|
|
|
private readonly MemoryBlock _addressSpace;
|
|
private readonly MemoryBlock _addressSpaceMirror;
|
|
private readonly ulong _addressSpaceSize;
|
|
|
|
private readonly MemoryEhMeilleure _memoryEh;
|
|
|
|
private ulong[] _pageTable;
|
|
|
|
public int AddressSpaceBits { get; }
|
|
|
|
public IntPtr PageTablePointer => _addressSpace.Pointer;
|
|
|
|
public MemoryManagerType Type => _unsafeMode ? MemoryManagerType.HostMappedUnsafe : MemoryManagerType.HostMapped;
|
|
|
|
public MemoryTracking Tracking { get; }
|
|
|
|
public event Action<ulong, ulong> UnmapEvent;
|
|
|
|
/// <summary>
|
|
/// Creates a new instance of the host mapped memory manager.
|
|
/// </summary>
|
|
/// <param name="addressSpaceSize">Size of the address space</param>
|
|
/// <param name="unsafeMode">True if unmanaged access should not be masked (unsafe), false otherwise.</param>
|
|
/// <param name="invalidAccessHandler">Optional function to handle invalid memory accesses</param>
|
|
public MemoryManagerHostMapped(ulong addressSpaceSize, bool unsafeMode, InvalidAccessHandler invalidAccessHandler = null)
|
|
{
|
|
_invalidAccessHandler = invalidAccessHandler;
|
|
_unsafeMode = unsafeMode;
|
|
_addressSpaceSize = addressSpaceSize;
|
|
|
|
ulong asSize = PageSize;
|
|
int asBits = PageBits;
|
|
|
|
while (asSize < addressSpaceSize)
|
|
{
|
|
asSize <<= 1;
|
|
asBits++;
|
|
}
|
|
|
|
AddressSpaceBits = asBits;
|
|
|
|
_pageTable = new ulong[1 << (AddressSpaceBits - (PageBits + PageToPteShift))];
|
|
_addressSpace = new MemoryBlock(asSize, MemoryAllocationFlags.Reserve | MemoryAllocationFlags.Mirrorable);
|
|
_addressSpaceMirror = _addressSpace.CreateMirror();
|
|
Tracking = new MemoryTracking(this, PageSize, invalidAccessHandler);
|
|
_memoryEh = new MemoryEhMeilleure(_addressSpace, Tracking);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Checks if the virtual address is part of the addressable space.
|
|
/// </summary>
|
|
/// <param name="va">Virtual address</param>
|
|
/// <returns>True if the virtual address is part of the addressable space</returns>
|
|
private bool ValidateAddress(ulong va)
|
|
{
|
|
return va < _addressSpaceSize;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Checks if the combination of virtual address and size is part of the addressable space.
|
|
/// </summary>
|
|
/// <param name="va">Virtual address of the range</param>
|
|
/// <param name="size">Size of the range in bytes</param>
|
|
/// <returns>True if the combination of virtual address and size is part of the addressable space</returns>
|
|
private bool ValidateAddressAndSize(ulong va, ulong size)
|
|
{
|
|
ulong endVa = va + size;
|
|
return endVa >= va && endVa >= size && endVa <= _addressSpaceSize;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Ensures the combination of virtual address and size is part of the addressable space.
|
|
/// </summary>
|
|
/// <param name="va">Virtual address of the range</param>
|
|
/// <param name="size">Size of the range in bytes</param>
|
|
/// <exception cref="InvalidMemoryRegionException">Throw when the memory region specified outside the addressable space</exception>
|
|
private void AssertValidAddressAndSize(ulong va, ulong size)
|
|
{
|
|
if (!ValidateAddressAndSize(va, size))
|
|
{
|
|
throw new InvalidMemoryRegionException($"va=0x{va:X16}, size=0x{size:X16}");
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Ensures the combination of virtual address and size is part of the addressable space and fully mapped.
|
|
/// </summary>
|
|
/// <param name="va">Virtual address of the range</param>
|
|
/// <param name="size">Size of the range in bytes</param>
|
|
private void AssertMapped(ulong va, ulong size)
|
|
{
|
|
if (!ValidateAddressAndSize(va, size) || !IsRangeMappedImpl(va, size))
|
|
{
|
|
throw new InvalidMemoryRegionException($"Not mapped: va=0x{va:X16}, size=0x{size:X16}");
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public void Map(ulong va, nuint hostAddress, ulong size)
|
|
{
|
|
AssertValidAddressAndSize(va, size);
|
|
|
|
_addressSpace.Commit(va, size);
|
|
AddMapping(va, size);
|
|
|
|
Tracking.Map(va, size);
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public void Unmap(ulong va, ulong size)
|
|
{
|
|
AssertValidAddressAndSize(va, size);
|
|
|
|
UnmapEvent?.Invoke(va, size);
|
|
Tracking.Unmap(va, size);
|
|
|
|
RemoveMapping(va, size);
|
|
_addressSpace.Decommit(va, size);
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public T Read<T>(ulong va) where T : unmanaged
|
|
{
|
|
try
|
|
{
|
|
AssertMapped(va, (ulong)Unsafe.SizeOf<T>());
|
|
|
|
return _addressSpaceMirror.Read<T>(va);
|
|
}
|
|
catch (InvalidMemoryRegionException)
|
|
{
|
|
if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
|
|
{
|
|
throw;
|
|
}
|
|
|
|
return default;
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public T ReadTracked<T>(ulong va) where T : unmanaged
|
|
{
|
|
try
|
|
{
|
|
SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), false);
|
|
|
|
return Read<T>(va);
|
|
}
|
|
catch (InvalidMemoryRegionException)
|
|
{
|
|
if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
|
|
{
|
|
throw;
|
|
}
|
|
|
|
return default;
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public void Read(ulong va, Span<byte> data)
|
|
{
|
|
try
|
|
{
|
|
AssertMapped(va, (ulong)data.Length);
|
|
|
|
_addressSpaceMirror.Read(va, data);
|
|
}
|
|
catch (InvalidMemoryRegionException)
|
|
{
|
|
if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
|
|
{
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public void Write<T>(ulong va, T value) where T : unmanaged
|
|
{
|
|
try
|
|
{
|
|
SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), write: true);
|
|
|
|
_addressSpaceMirror.Write(va, value);
|
|
}
|
|
catch (InvalidMemoryRegionException)
|
|
{
|
|
if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
|
|
{
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public void Write(ulong va, ReadOnlySpan<byte> data)
|
|
{
|
|
try {
|
|
SignalMemoryTracking(va, (ulong)data.Length, write: true);
|
|
|
|
_addressSpaceMirror.Write(va, data);
|
|
}
|
|
catch (InvalidMemoryRegionException)
|
|
{
|
|
if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
|
|
{
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public void WriteUntracked(ulong va, ReadOnlySpan<byte> data)
|
|
{
|
|
try
|
|
{
|
|
AssertMapped(va, (ulong)data.Length);
|
|
|
|
_addressSpaceMirror.Write(va, data);
|
|
}
|
|
catch (InvalidMemoryRegionException)
|
|
{
|
|
if (_invalidAccessHandler == null || !_invalidAccessHandler(va))
|
|
{
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public ReadOnlySpan<byte> GetSpan(ulong va, int size, bool tracked = false)
|
|
{
|
|
if (tracked)
|
|
{
|
|
SignalMemoryTracking(va, (ulong)size, write: false);
|
|
}
|
|
else
|
|
{
|
|
AssertMapped(va, (ulong)size);
|
|
}
|
|
|
|
return _addressSpaceMirror.GetSpan(va, size);
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public WritableRegion GetWritableRegion(ulong va, int size, bool tracked = false)
|
|
{
|
|
if (tracked)
|
|
{
|
|
SignalMemoryTracking(va, (ulong)size, true);
|
|
}
|
|
else
|
|
{
|
|
AssertMapped(va, (ulong)size);
|
|
}
|
|
|
|
return _addressSpaceMirror.GetWritableRegion(va, size);
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public ref T GetRef<T>(ulong va) where T : unmanaged
|
|
{
|
|
SignalMemoryTracking(va, (ulong)Unsafe.SizeOf<T>(), true);
|
|
|
|
return ref _addressSpaceMirror.GetRef<T>(va);
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
public bool IsMapped(ulong va)
|
|
{
|
|
return ValidateAddress(va) && IsMappedImpl(va);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private bool IsMappedImpl(ulong va)
|
|
{
|
|
ulong page = va >> PageBits;
|
|
|
|
int bit = (int)((page & 31) << 1);
|
|
|
|
int pageIndex = (int)(page >> PageToPteShift);
|
|
ref ulong pageRef = ref _pageTable[pageIndex];
|
|
|
|
ulong pte = Volatile.Read(ref pageRef);
|
|
|
|
return ((pte >> bit) & 3) != 0;
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public bool IsRangeMapped(ulong va, ulong size)
|
|
{
|
|
AssertValidAddressAndSize(va, size);
|
|
|
|
return IsRangeMappedImpl(va, size);
|
|
}
|
|
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private void GetPageBlockRange(ulong pageStart, ulong pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex)
|
|
{
|
|
startMask = ulong.MaxValue << ((int)(pageStart & 31) << 1);
|
|
endMask = ulong.MaxValue >> (64 - ((int)(pageEnd & 31) << 1));
|
|
|
|
pageIndex = (int)(pageStart >> PageToPteShift);
|
|
pageEndIndex = (int)((pageEnd - 1) >> PageToPteShift);
|
|
}
|
|
|
|
private bool IsRangeMappedImpl(ulong va, ulong size)
|
|
{
|
|
int pages = GetPagesCount(va, size, out _);
|
|
|
|
if (pages == 1)
|
|
{
|
|
return IsMappedImpl(va);
|
|
}
|
|
|
|
ulong pageStart = va >> PageBits;
|
|
ulong pageEnd = pageStart + (ulong)pages;
|
|
|
|
GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
|
|
|
|
// Check if either bit in each 2 bit page entry is set.
|
|
// OR the block with itself shifted down by 1, and check the first bit of each entry.
|
|
|
|
ulong mask = BlockMappedMask & startMask;
|
|
|
|
while (pageIndex <= pageEndIndex)
|
|
{
|
|
if (pageIndex == pageEndIndex)
|
|
{
|
|
mask &= endMask;
|
|
}
|
|
|
|
ref ulong pageRef = ref _pageTable[pageIndex++];
|
|
ulong pte = Volatile.Read(ref pageRef);
|
|
|
|
pte |= pte >> 1;
|
|
if ((pte & mask) != mask)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
mask = BlockMappedMask;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public IEnumerable<HostMemoryRange> GetPhysicalRegions(ulong va, ulong size)
|
|
{
|
|
if (size == 0)
|
|
{
|
|
return Enumerable.Empty<HostMemoryRange>();
|
|
}
|
|
|
|
AssertMapped(va, size);
|
|
|
|
return new HostMemoryRange[] { new HostMemoryRange(_addressSpaceMirror.GetPointer(va, size), size) };
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
/// <remarks>
|
|
/// This function also validates that the given range is both valid and mapped, and will throw if it is not.
|
|
/// </remarks>
|
|
public void SignalMemoryTracking(ulong va, ulong size, bool write)
|
|
{
|
|
AssertValidAddressAndSize(va, size);
|
|
|
|
// Software table, used for managed memory tracking.
|
|
|
|
int pages = GetPagesCount(va, size, out _);
|
|
ulong pageStart = va >> PageBits;
|
|
|
|
if (pages == 1)
|
|
{
|
|
ulong tag = (ulong)(write ? HostMappedPtBits.WriteTracked : HostMappedPtBits.ReadWriteTracked);
|
|
|
|
int bit = (int)((pageStart & 31) << 1);
|
|
|
|
int pageIndex = (int)(pageStart >> PageToPteShift);
|
|
ref ulong pageRef = ref _pageTable[pageIndex];
|
|
|
|
ulong pte = Volatile.Read(ref pageRef);
|
|
ulong state = ((pte >> bit) & 3);
|
|
|
|
if (state >= tag)
|
|
{
|
|
Tracking.VirtualMemoryEvent(va, size, write);
|
|
return;
|
|
}
|
|
else if (state == 0)
|
|
{
|
|
ThrowInvalidMemoryRegionException($"Not mapped: va=0x{va:X16}, size=0x{size:X16}");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
ulong pageEnd = pageStart + (ulong)pages;
|
|
|
|
GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
|
|
|
|
ulong mask = startMask;
|
|
|
|
ulong anyTrackingTag = (ulong)HostMappedPtBits.WriteTrackedReplicated;
|
|
|
|
while (pageIndex <= pageEndIndex)
|
|
{
|
|
if (pageIndex == pageEndIndex)
|
|
{
|
|
mask &= endMask;
|
|
}
|
|
|
|
ref ulong pageRef = ref _pageTable[pageIndex++];
|
|
|
|
ulong pte = Volatile.Read(ref pageRef);
|
|
ulong mappedMask = mask & BlockMappedMask;
|
|
|
|
ulong mappedPte = pte | (pte >> 1);
|
|
if ((mappedPte & mappedMask) != mappedMask)
|
|
{
|
|
ThrowInvalidMemoryRegionException($"Not mapped: va=0x{va:X16}, size=0x{size:X16}");
|
|
}
|
|
|
|
pte &= mask;
|
|
if ((pte & anyTrackingTag) != 0) // Search for any tracking.
|
|
{
|
|
// Writes trigger any tracking.
|
|
// Only trigger tracking from reads if both bits are set on any page.
|
|
if (write || (pte & (pte >> 1) & BlockMappedMask) != 0)
|
|
{
|
|
Tracking.VirtualMemoryEvent(va, size, write);
|
|
break;
|
|
}
|
|
}
|
|
|
|
mask = ulong.MaxValue;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Computes the number of pages in a virtual address range.
|
|
/// </summary>
|
|
/// <param name="va">Virtual address of the range</param>
|
|
/// <param name="size">Size of the range</param>
|
|
/// <param name="startVa">The virtual address of the beginning of the first page</param>
|
|
/// <remarks>This function does not differentiate between allocated and unallocated pages.</remarks>
|
|
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
|
private int GetPagesCount(ulong va, ulong size, out ulong startVa)
|
|
{
|
|
// WARNING: Always check if ulong does not overflow during the operations.
|
|
startVa = va & ~(ulong)PageMask;
|
|
ulong vaSpan = (va - startVa + size + PageMask) & ~(ulong)PageMask;
|
|
|
|
return (int)(vaSpan / PageSize);
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection)
|
|
{
|
|
// Protection is inverted on software pages, since the default value is 0.
|
|
protection = (~protection) & MemoryPermission.ReadAndWrite;
|
|
|
|
int pages = GetPagesCount(va, size, out va);
|
|
ulong pageStart = va >> PageBits;
|
|
|
|
if (pages == 1)
|
|
{
|
|
ulong protTag = protection switch
|
|
{
|
|
MemoryPermission.None => (ulong)HostMappedPtBits.Mapped,
|
|
MemoryPermission.Write => (ulong)HostMappedPtBits.WriteTracked,
|
|
_ => (ulong)HostMappedPtBits.ReadWriteTracked,
|
|
};
|
|
|
|
int bit = (int)((pageStart & 31) << 1);
|
|
|
|
ulong tagMask = 3UL << bit;
|
|
ulong invTagMask = ~tagMask;
|
|
|
|
ulong tag = protTag << bit;
|
|
|
|
int pageIndex = (int)(pageStart >> PageToPteShift);
|
|
ref ulong pageRef = ref _pageTable[pageIndex];
|
|
|
|
ulong pte;
|
|
|
|
do
|
|
{
|
|
pte = Volatile.Read(ref pageRef);
|
|
}
|
|
while ((pte & tagMask) != 0 && Interlocked.CompareExchange(ref pageRef, (pte & invTagMask) | tag, pte) != pte);
|
|
}
|
|
else
|
|
{
|
|
ulong pageEnd = pageStart + (ulong)pages;
|
|
|
|
GetPageBlockRange(pageStart, pageEnd, out ulong startMask, out ulong endMask, out int pageIndex, out int pageEndIndex);
|
|
|
|
ulong mask = startMask;
|
|
|
|
ulong protTag = protection switch
|
|
{
|
|
MemoryPermission.None => (ulong)HostMappedPtBits.MappedReplicated,
|
|
MemoryPermission.Write => (ulong)HostMappedPtBits.WriteTrackedReplicated,
|
|
_ => (ulong)HostMappedPtBits.ReadWriteTrackedReplicated,
|
|
};
|
|
|
|
while (pageIndex <= pageEndIndex)
|
|
{
|
|
if (pageIndex == pageEndIndex)
|
|
{
|
|
mask &= endMask;
|
|
}
|
|
|
|
ref ulong pageRef = ref _pageTable[pageIndex++];
|
|
|
|
ulong pte;
|
|
ulong mappedMask;
|
|
|
|
// Change the protection of all 2 bit entries that are mapped.
|
|
do
|
|
{
|
|
pte = Volatile.Read(ref pageRef);
|
|
|
|
mappedMask = pte | (pte >> 1);
|
|
mappedMask |= (mappedMask & BlockMappedMask) << 1;
|
|
mappedMask &= mask; // Only update mapped pages within the given range.
|
|
}
|
|
while (Interlocked.CompareExchange(ref pageRef, (pte & (~mappedMask)) | (protTag & mappedMask), pte) != pte);
|
|
|
|
mask = ulong.MaxValue;
|
|
}
|
|
}
|
|
|
|
protection = protection switch
|
|
{
|
|
MemoryPermission.None => MemoryPermission.ReadAndWrite,
|
|
MemoryPermission.Write => MemoryPermission.Read,
|
|
_ => MemoryPermission.None
|
|
};
|
|
|
|
_addressSpace.Reprotect(va, size, protection, false);
|
|
}
|
|
|
|
/// <inheritdoc/>
|
|
public CpuRegionHandle BeginTracking(ulong address, ulong size)
|
|
{
|
|
return new CpuRegionHandle(Tracking.BeginTracking(address, size));
|
|
}
|
|
|
|
/// <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;
|
|
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 _pageTable[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 _pageTable[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()
|
|
{
|
|
_addressSpaceMirror.Dispose();
|
|
_addressSpace.Dispose();
|
|
_memoryEh.Dispose();
|
|
}
|
|
|
|
private void ThrowInvalidMemoryRegionException(string message) => throw new InvalidMemoryRegionException(message);
|
|
}
|
|
}
|