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using Ryujinx.Memory.Range;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
namespace Ryujinx.Memory
{
/// <summary>
/// Represents a address space manager.
/// Supports virtual memory region mapping, address translation and read/write access to mapped regions.
/// </summary>
public sealed class AddressSpaceManager : VirtualMemoryManagerBase, IVirtualMemoryManager
{
/// <inheritdoc/>
public bool UsesPrivateAllocations => false;
/// <summary>
/// Address space width in bits.
/// </summary>
public int AddressSpaceBits { get; }
private readonly MemoryBlock _backingMemory;
private readonly PageTable<nuint> _pageTable;
protected override ulong AddressSpaceSize { get; }
/// <summary>
/// Creates a new instance of the memory manager.
/// </summary>
/// <param name="backingMemory">Physical backing memory where virtual memory will be mapped to</param>
/// <param name="addressSpaceSize">Size of the address space</param>
public AddressSpaceManager(MemoryBlock backingMemory, ulong addressSpaceSize)
{
ulong asSize = PageSize;
int asBits = PageBits;
while (asSize < addressSpaceSize)
{
asSize <<= 1;
asBits++;
}
AddressSpaceBits = asBits;
AddressSpaceSize = asSize;
_backingMemory = backingMemory;
_pageTable = new PageTable<nuint>();
}
/// <inheritdoc/>
public void Map(ulong va, ulong pa, ulong size, MemoryMapFlags flags)
{
AssertValidAddressAndSize(va, size);
while (size != 0)
{
_pageTable.Map(va, (nuint)(ulong)_backingMemory.GetPointer(pa, PageSize));
va += PageSize;
pa += PageSize;
size -= PageSize;
}
}
public override void MapForeign(ulong va, nuint hostPointer, ulong size)
{
AssertValidAddressAndSize(va, size);
while (size != 0)
{
_pageTable.Map(va, hostPointer);
va += PageSize;
hostPointer += PageSize;
size -= PageSize;
}
}
/// <inheritdoc/>
public void Unmap(ulong va, ulong size)
{
AssertValidAddressAndSize(va, size);
while (size != 0)
{
_pageTable.Unmap(va);
va += PageSize;
size -= PageSize;
}
}
/// <inheritdoc/>
public unsafe ref T GetRef<T>(ulong va) where T : unmanaged
{
if (!IsContiguous(va, Unsafe.SizeOf<T>()))
{
ThrowMemoryNotContiguous();
}
return ref *(T*)GetHostAddress(va);
}
/// <inheritdoc/>
public IEnumerable<HostMemoryRange> GetHostRegions(ulong va, ulong size)
{
if (size == 0)
{
return Enumerable.Empty<HostMemoryRange>();
}
return GetHostRegionsImpl(va, size);
}
/// <inheritdoc/>
public IEnumerable<MemoryRange> GetPhysicalRegions(ulong va, ulong size)
{
if (size == 0)
{
return Enumerable.Empty<MemoryRange>();
}
var hostRegions = GetHostRegionsImpl(va, size);
if (hostRegions == null)
{
return null;
}
var regions = new MemoryRange[hostRegions.Count];
ulong backingStart = (ulong)_backingMemory.Pointer;
ulong backingEnd = backingStart + _backingMemory.Size;
int count = 0;
for (int i = 0; i < regions.Length; i++)
{
var hostRegion = hostRegions[i];
if (hostRegion.Address >= backingStart && hostRegion.Address < backingEnd)
{
regions[count++] = new MemoryRange(hostRegion.Address - backingStart, hostRegion.Size);
}
}
if (count != regions.Length)
{
return new ArraySegment<MemoryRange>(regions, 0, count);
}
return regions;
}
private List<HostMemoryRange> GetHostRegionsImpl(ulong va, ulong size)
{
if (!ValidateAddress(va) || !ValidateAddressAndSize(va, size))
{
return null;
}
int pages = GetPagesCount(va, size, out va);
var regions = new List<HostMemoryRange>();
nuint regionStart = GetHostAddress(va);
ulong regionSize = PageSize;
for (int page = 0; page < pages - 1; page++)
{
if (!ValidateAddress(va + PageSize))
{
return null;
}
nuint newHostAddress = GetHostAddress(va + PageSize);
if (GetHostAddress(va) + PageSize != newHostAddress)
{
regions.Add(new HostMemoryRange(regionStart, regionSize));
regionStart = newHostAddress;
regionSize = 0;
}
va += PageSize;
regionSize += PageSize;
}
regions.Add(new HostMemoryRange(regionStart, regionSize));
return regions;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override bool IsMapped(ulong va)
{
if (!ValidateAddress(va))
{
return false;
}
return _pageTable.Read(va) != 0;
}
/// <inheritdoc/>
public bool IsRangeMapped(ulong va, ulong size)
{
if (size == 0)
{
return true;
}
if (!ValidateAddressAndSize(va, size))
{
return false;
}
int pages = GetPagesCount(va, (uint)size, out va);
for (int page = 0; page < pages; page++)
{
if (!IsMapped(va))
{
return false;
}
va += PageSize;
}
return true;
}
private nuint GetHostAddress(ulong va)
{
return _pageTable.Read(va) + (nuint)(va & PageMask);
}
/// <inheritdoc/>
public void Reprotect(ulong va, ulong size, MemoryPermission protection)
{
}
/// <inheritdoc/>
public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection, bool guest = false)
{
throw new NotImplementedException();
}
protected unsafe override Memory<byte> GetPhysicalAddressMemory(nuint pa, int size)
=> new NativeMemoryManager<byte>((byte*)pa, size).Memory;
protected override unsafe Span<byte> GetPhysicalAddressSpan(nuint pa, int size)
=> new Span<byte>((void*)pa, size);
protected override nuint TranslateVirtualAddressChecked(ulong va)
=> GetHostAddress(va);
protected override nuint TranslateVirtualAddressUnchecked(ulong va)
=> GetHostAddress(va);
}
}
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