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ryujinx/Ryujinx.HLE/HOS/Kernel/Memory/KPageTableBase.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

2858 lines
99 KiB
C#
Raw Blame History

using Ryujinx.Common;
using Ryujinx.HLE.HOS.Kernel.Common;
using Ryujinx.HLE.HOS.Kernel.Process;
using Ryujinx.Memory.Range;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
namespace Ryujinx.HLE.HOS.Kernel.Memory
{
abstract class KPageTableBase
{
private static readonly int[] MappingUnitSizes = new int[]
{
0x1000,
0x10000,
0x200000,
0x400000,
0x2000000,
0x40000000
};
public const int PageSize = 0x1000;
private const int KMemoryBlockSize = 0x40;
// We need 2 blocks for the case where a big block
// needs to be split in 2, plus one block that will be the new one inserted.
private const int MaxBlocksNeededForInsertion = 2;
protected readonly KernelContext Context;
public ulong AddrSpaceStart { get; private set; }
public ulong AddrSpaceEnd { get; private set; }
public ulong CodeRegionStart { get; private set; }
public ulong CodeRegionEnd { get; private set; }
public ulong HeapRegionStart { get; private set; }
public ulong HeapRegionEnd { get; private set; }
private ulong _currentHeapAddr;
public ulong AliasRegionStart { get; private set; }
public ulong AliasRegionEnd { get; private set; }
public ulong StackRegionStart { get; private set; }
public ulong StackRegionEnd { get; private set; }
public ulong TlsIoRegionStart { get; private set; }
public ulong TlsIoRegionEnd { get; private set; }
private ulong _heapCapacity;
public ulong PhysicalMemoryUsage { get; private set; }
private readonly KMemoryBlockManager _blockManager;
private MemoryRegion _memRegion;
private bool _aslrDisabled;
public int AddrSpaceWidth { get; private set; }
private bool _isKernel;
private bool _aslrEnabled;
private KMemoryBlockSlabManager _slabManager;
private int _contextId;
private MersenneTwister _randomNumberGenerator;
public abstract bool SupportsMemoryAliasing { get; }
private MemoryFillValue _heapFillValue;
private MemoryFillValue _ipcFillValue;
public KPageTableBase(KernelContext context)
{
Context = context;
_blockManager = new KMemoryBlockManager();
_isKernel = false;
_heapFillValue = MemoryFillValue.Zero;
_ipcFillValue = MemoryFillValue.Zero;
}
private static readonly int[] AddrSpaceSizes = new int[] { 32, 36, 32, 39 };
public KernelResult InitializeForProcess(
AddressSpaceType addrSpaceType,
bool aslrEnabled,
bool aslrDisabled,
MemoryRegion memRegion,
ulong address,
ulong size,
KMemoryBlockSlabManager slabManager)
{
if ((uint)addrSpaceType > (uint)AddressSpaceType.Addr39Bits)
{
throw new ArgumentException(nameof(addrSpaceType));
}
_contextId = Context.ContextIdManager.GetId();
ulong addrSpaceBase = 0;
ulong addrSpaceSize = 1UL << AddrSpaceSizes[(int)addrSpaceType];
KernelResult result = CreateUserAddressSpace(
addrSpaceType,
aslrEnabled,
aslrDisabled,
addrSpaceBase,
addrSpaceSize,
memRegion,
address,
size,
slabManager);
if (result != KernelResult.Success)
{
Context.ContextIdManager.PutId(_contextId);
}
return result;
}
private class Region
{
public ulong Start;
public ulong End;
public ulong Size;
public ulong AslrOffset;
}
private KernelResult CreateUserAddressSpace(
AddressSpaceType addrSpaceType,
bool aslrEnabled,
bool aslrDisabled,
ulong addrSpaceStart,
ulong addrSpaceEnd,
MemoryRegion memRegion,
ulong address,
ulong size,
KMemoryBlockSlabManager slabManager)
{
ulong endAddr = address + size;
Region aliasRegion = new Region();
Region heapRegion = new Region();
Region stackRegion = new Region();
Region tlsIoRegion = new Region();
ulong codeRegionSize;
ulong stackAndTlsIoStart;
ulong stackAndTlsIoEnd;
ulong baseAddress;
switch (addrSpaceType)
{
case AddressSpaceType.Addr32Bits:
aliasRegion.Size = 0x40000000;
heapRegion.Size = 0x40000000;
stackRegion.Size = 0;
tlsIoRegion.Size = 0;
CodeRegionStart = 0x200000;
codeRegionSize = 0x3fe00000;
stackAndTlsIoStart = 0x200000;
stackAndTlsIoEnd = 0x40000000;
baseAddress = 0x200000;
AddrSpaceWidth = 32;
break;
case AddressSpaceType.Addr36Bits:
aliasRegion.Size = 0x180000000;
heapRegion.Size = 0x180000000;
stackRegion.Size = 0;
tlsIoRegion.Size = 0;
CodeRegionStart = 0x8000000;
codeRegionSize = 0x78000000;
stackAndTlsIoStart = 0x8000000;
stackAndTlsIoEnd = 0x80000000;
baseAddress = 0x8000000;
AddrSpaceWidth = 36;
break;
case AddressSpaceType.Addr32BitsNoMap:
aliasRegion.Size = 0;
heapRegion.Size = 0x80000000;
stackRegion.Size = 0;
tlsIoRegion.Size = 0;
CodeRegionStart = 0x200000;
codeRegionSize = 0x3fe00000;
stackAndTlsIoStart = 0x200000;
stackAndTlsIoEnd = 0x40000000;
baseAddress = 0x200000;
AddrSpaceWidth = 32;
break;
case AddressSpaceType.Addr39Bits:
aliasRegion.Size = 0x1000000000;
heapRegion.Size = 0x180000000;
stackRegion.Size = 0x80000000;
tlsIoRegion.Size = 0x1000000000;
CodeRegionStart = BitUtils.AlignDown(address, 0x200000);
codeRegionSize = BitUtils.AlignUp(endAddr, 0x200000) - CodeRegionStart;
stackAndTlsIoStart = 0;
stackAndTlsIoEnd = 0;
baseAddress = 0x8000000;
AddrSpaceWidth = 39;
break;
default: throw new ArgumentException(nameof(addrSpaceType));
}
CodeRegionEnd = CodeRegionStart + codeRegionSize;
ulong mapBaseAddress;
ulong mapAvailableSize;
if (CodeRegionStart - baseAddress >= addrSpaceEnd - CodeRegionEnd)
{
// Has more space before the start of the code region.
mapBaseAddress = baseAddress;
mapAvailableSize = CodeRegionStart - baseAddress;
}
else
{
// Has more space after the end of the code region.
mapBaseAddress = CodeRegionEnd;
mapAvailableSize = addrSpaceEnd - CodeRegionEnd;
}
ulong mapTotalSize = aliasRegion.Size + heapRegion.Size + stackRegion.Size + tlsIoRegion.Size;
ulong aslrMaxOffset = mapAvailableSize - mapTotalSize;
_aslrEnabled = aslrEnabled;
AddrSpaceStart = addrSpaceStart;
AddrSpaceEnd = addrSpaceEnd;
_slabManager = slabManager;
if (mapAvailableSize < mapTotalSize)
{
return KernelResult.OutOfMemory;
}
if (aslrEnabled)
{
aliasRegion.AslrOffset = GetRandomValue(0, aslrMaxOffset >> 21) << 21;
heapRegion.AslrOffset = GetRandomValue(0, aslrMaxOffset >> 21) << 21;
stackRegion.AslrOffset = GetRandomValue(0, aslrMaxOffset >> 21) << 21;
tlsIoRegion.AslrOffset = GetRandomValue(0, aslrMaxOffset >> 21) << 21;
}
// Regions are sorted based on ASLR offset.
// When ASLR is disabled, the order is Map, Heap, NewMap and TlsIo.
aliasRegion.Start = mapBaseAddress + aliasRegion.AslrOffset;
aliasRegion.End = aliasRegion.Start + aliasRegion.Size;
heapRegion.Start = mapBaseAddress + heapRegion.AslrOffset;
heapRegion.End = heapRegion.Start + heapRegion.Size;
stackRegion.Start = mapBaseAddress + stackRegion.AslrOffset;
stackRegion.End = stackRegion.Start + stackRegion.Size;
tlsIoRegion.Start = mapBaseAddress + tlsIoRegion.AslrOffset;
tlsIoRegion.End = tlsIoRegion.Start + tlsIoRegion.Size;
SortRegion(heapRegion, aliasRegion);
if (stackRegion.Size != 0)
{
SortRegion(stackRegion, aliasRegion);
SortRegion(stackRegion, heapRegion);
}
else
{
stackRegion.Start = stackAndTlsIoStart;
stackRegion.End = stackAndTlsIoEnd;
}
if (tlsIoRegion.Size != 0)
{
SortRegion(tlsIoRegion, aliasRegion);
SortRegion(tlsIoRegion, heapRegion);
SortRegion(tlsIoRegion, stackRegion);
}
else
{
tlsIoRegion.Start = stackAndTlsIoStart;
tlsIoRegion.End = stackAndTlsIoEnd;
}
AliasRegionStart = aliasRegion.Start;
AliasRegionEnd = aliasRegion.End;
HeapRegionStart = heapRegion.Start;
HeapRegionEnd = heapRegion.End;
StackRegionStart = stackRegion.Start;
StackRegionEnd = stackRegion.End;
TlsIoRegionStart = tlsIoRegion.Start;
TlsIoRegionEnd = tlsIoRegion.End;
// TODO: Check kernel configuration via secure monitor call when implemented to set memory fill values.
_currentHeapAddr = HeapRegionStart;
_heapCapacity = 0;
PhysicalMemoryUsage = 0;
_memRegion = memRegion;
_aslrDisabled = aslrDisabled;
return _blockManager.Initialize(addrSpaceStart, addrSpaceEnd, slabManager);
}
private ulong GetRandomValue(ulong min, ulong max)
{
return (ulong)GetRandomValue((long)min, (long)max);
}
private long GetRandomValue(long min, long max)
{
if (_randomNumberGenerator == null)
{
_randomNumberGenerator = new MersenneTwister(0);
}
return _randomNumberGenerator.GenRandomNumber(min, max);
}
private static void SortRegion(Region lhs, Region rhs)
{
if (lhs.AslrOffset < rhs.AslrOffset)
{
rhs.Start += lhs.Size;
rhs.End += lhs.Size;
}
else
{
lhs.Start += rhs.Size;
lhs.End += rhs.Size;
}
}
public KernelResult MapPages(ulong address, KPageList pageList, MemoryState state, KMemoryPermission permission)
{
ulong pagesCount = pageList.GetPagesCount();
ulong size = pagesCount * PageSize;
if (!CanContain(address, size, state))
{
return KernelResult.InvalidMemState;
}
lock (_blockManager)
{
if (!IsUnmapped(address, pagesCount * PageSize))
{
return KernelResult.InvalidMemState;
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
KernelResult result = MapPages(address, pageList, permission);
if (result == KernelResult.Success)
{
_blockManager.InsertBlock(address, pagesCount, state, permission);
}
return result;
}
}
public KernelResult UnmapPages(ulong address, ulong pagesCount, IEnumerable<HostMemoryRange> ranges, MemoryState stateExpected)
{
ulong size = pagesCount * PageSize;
ulong endAddr = address + size;
ulong addrSpacePagesCount = (AddrSpaceEnd - AddrSpaceStart) / PageSize;
if (AddrSpaceStart > address)
{
return KernelResult.InvalidMemState;
}
if (addrSpacePagesCount < pagesCount)
{
return KernelResult.InvalidMemState;
}
if (endAddr - 1 > AddrSpaceEnd - 1)
{
return KernelResult.InvalidMemState;
}
lock (_blockManager)
{
var currentRanges = GetPhysicalRegions(address, size);
if (!currentRanges.SequenceEqual(ranges))
{
return KernelResult.InvalidMemRange;
}
if (CheckRange(
address,
size,
MemoryState.Mask,
stateExpected,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState state,
out _,
out _))
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
KernelResult result = Unmap(address, pagesCount);
if (result == KernelResult.Success)
{
_blockManager.InsertBlock(address, pagesCount, MemoryState.Unmapped);
}
return result;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult MapNormalMemory(long address, long size, KMemoryPermission permission)
{
// TODO.
return KernelResult.Success;
}
public KernelResult MapIoMemory(long address, long size, KMemoryPermission permission)
{
// TODO.
return KernelResult.Success;
}
public KernelResult MapPages(
ulong pagesCount,
int alignment,
ulong srcPa,
bool paIsValid,
ulong regionStart,
ulong regionPagesCount,
MemoryState state,
KMemoryPermission permission,
out ulong address)
{
address = 0;
ulong regionSize = regionPagesCount * PageSize;
if (!CanContain(regionStart, regionSize, state))
{
return KernelResult.InvalidMemState;
}
if (regionPagesCount <= pagesCount)
{
return KernelResult.OutOfMemory;
}
lock (_blockManager)
{
address = AllocateVa(regionStart, regionPagesCount, pagesCount, alignment);
if (address == 0)
{
return KernelResult.OutOfMemory;
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
KernelResult result;
if (paIsValid)
{
result = MapPages(address, pagesCount, srcPa, permission);
}
else
{
result = AllocateAndMapPages(address, pagesCount, permission);
}
if (result != KernelResult.Success)
{
return result;
}
_blockManager.InsertBlock(address, pagesCount, state, permission);
}
return KernelResult.Success;
}
public KernelResult MapPages(ulong address, ulong pagesCount, MemoryState state, KMemoryPermission permission)
{
ulong size = pagesCount * PageSize;
if (!CanContain(address, size, state))
{
return KernelResult.InvalidMemState;
}
lock (_blockManager)
{
if (!IsUnmapped(address, size))
{
return KernelResult.InvalidMemState;
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
KernelResult result = AllocateAndMapPages(address, pagesCount, permission);
if (result == KernelResult.Success)
{
_blockManager.InsertBlock(address, pagesCount, state, permission);
}
return result;
}
}
private KernelResult AllocateAndMapPages(ulong address, ulong pagesCount, KMemoryPermission permission)
{
KMemoryRegionManager region = GetMemoryRegionManager();
KernelResult result = region.AllocatePages(pagesCount, _aslrDisabled, out KPageList pageList);
if (result != KernelResult.Success)
{
return result;
}
using var _ = new OnScopeExit(() => pageList.DecrementPagesReferenceCount(Context.MemoryManager));
return MapPages(address, pageList, permission);
}
public KernelResult MapProcessCodeMemory(ulong dst, ulong src, ulong size)
{
lock (_blockManager)
{
bool success = CheckRange(
src,
size,
MemoryState.Mask,
MemoryState.Heap,
KMemoryPermission.Mask,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState state,
out KMemoryPermission permission,
out _);
success &= IsUnmapped(dst, size);
if (success)
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion * 2))
{
return KernelResult.OutOfResource;
}
ulong pagesCount = size / PageSize;
KernelResult result = MapMemory(src, dst, pagesCount, permission, KMemoryPermission.None);
_blockManager.InsertBlock(src, pagesCount, state, KMemoryPermission.None, MemoryAttribute.Borrowed);
_blockManager.InsertBlock(dst, pagesCount, MemoryState.ModCodeStatic);
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult UnmapProcessCodeMemory(ulong dst, ulong src, ulong size)
{
lock (_blockManager)
{
bool success = CheckRange(
src,
size,
MemoryState.Mask,
MemoryState.Heap,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.Borrowed,
MemoryAttribute.IpcAndDeviceMapped,
out _,
out _,
out _);
success &= CheckRange(
dst,
PageSize,
MemoryState.UnmapProcessCodeMemoryAllowed,
MemoryState.UnmapProcessCodeMemoryAllowed,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState state,
out _,
out _);
success &= CheckRange(
dst,
size,
MemoryState.Mask,
state,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None);
if (success)
{
ulong pagesCount = size / PageSize;
KernelResult result = Unmap(dst, pagesCount);
if (result != KernelResult.Success)
{
return result;
}
// TODO: Missing some checks here.
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion * 2))
{
return KernelResult.OutOfResource;
}
_blockManager.InsertBlock(dst, pagesCount, MemoryState.Unmapped);
_blockManager.InsertBlock(src, pagesCount, MemoryState.Heap, KMemoryPermission.ReadAndWrite);
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult SetHeapSize(ulong size, out ulong address)
{
address = 0;
if (size > HeapRegionEnd - HeapRegionStart)
{
return KernelResult.OutOfMemory;
}
KProcess currentProcess = KernelStatic.GetCurrentProcess();
lock (_blockManager)
{
ulong currentHeapSize = GetHeapSize();
if (currentHeapSize <= size)
{
// Expand.
ulong sizeDelta = size - currentHeapSize;
if (currentProcess.ResourceLimit != null && sizeDelta != 0 &&
!currentProcess.ResourceLimit.Reserve(LimitableResource.Memory, sizeDelta))
{
return KernelResult.ResLimitExceeded;
}
ulong pagesCount = sizeDelta / PageSize;
KMemoryRegionManager region = GetMemoryRegionManager();
KernelResult result = region.AllocatePages(pagesCount, _aslrDisabled, out KPageList pageList);
using var _ = new OnScopeExit(() => pageList.DecrementPagesReferenceCount(Context.MemoryManager));
void CleanUpForError()
{
if (currentProcess.ResourceLimit != null && sizeDelta != 0)
{
currentProcess.ResourceLimit.Release(LimitableResource.Memory, sizeDelta);
}
}
if (result != KernelResult.Success)
{
CleanUpForError();
return result;
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
CleanUpForError();
return KernelResult.OutOfResource;
}
if (!IsUnmapped(_currentHeapAddr, sizeDelta))
{
CleanUpForError();
return KernelResult.InvalidMemState;
}
result = MapPages(_currentHeapAddr, pageList, KMemoryPermission.ReadAndWrite, true, (byte)_heapFillValue);
if (result != KernelResult.Success)
{
CleanUpForError();
return result;
}
_blockManager.InsertBlock(_currentHeapAddr, pagesCount, MemoryState.Heap, KMemoryPermission.ReadAndWrite);
}
else
{
// Shrink.
ulong freeAddr = HeapRegionStart + size;
ulong sizeDelta = currentHeapSize - size;
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
if (!CheckRange(
freeAddr,
sizeDelta,
MemoryState.Mask,
MemoryState.Heap,
KMemoryPermission.Mask,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out _,
out _,
out _))
{
return KernelResult.InvalidMemState;
}
ulong pagesCount = sizeDelta / PageSize;
KernelResult result = Unmap(freeAddr, pagesCount);
if (result != KernelResult.Success)
{
return result;
}
currentProcess.ResourceLimit?.Release(LimitableResource.Memory, sizeDelta);
_blockManager.InsertBlock(freeAddr, pagesCount, MemoryState.Unmapped);
}
_currentHeapAddr = HeapRegionStart + size;
}
address = HeapRegionStart;
return KernelResult.Success;
}
public KernelResult SetMemoryPermission(ulong address, ulong size, KMemoryPermission permission)
{
lock (_blockManager)
{
if (CheckRange(
address,
size,
MemoryState.PermissionChangeAllowed,
MemoryState.PermissionChangeAllowed,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState oldState,
out KMemoryPermission oldPermission,
out _))
{
if (permission != oldPermission)
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
ulong pagesCount = size / PageSize;
KernelResult result = Reprotect(address, pagesCount, permission);
if (result != KernelResult.Success)
{
return result;
}
_blockManager.InsertBlock(address, pagesCount, oldState, permission);
}
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public ulong GetTotalHeapSize()
{
lock (_blockManager)
{
return GetHeapSize() + PhysicalMemoryUsage;
}
}
private ulong GetHeapSize()
{
return _currentHeapAddr - HeapRegionStart;
}
public KernelResult SetHeapCapacity(ulong capacity)
{
lock (_blockManager)
{
_heapCapacity = capacity;
}
return KernelResult.Success;
}
public KernelResult SetMemoryAttribute(
ulong address,
ulong size,
MemoryAttribute attributeMask,
MemoryAttribute attributeValue)
{
lock (_blockManager)
{
if (CheckRange(
address,
size,
MemoryState.AttributeChangeAllowed,
MemoryState.AttributeChangeAllowed,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.BorrowedAndIpcMapped,
MemoryAttribute.None,
MemoryAttribute.DeviceMappedAndUncached,
out MemoryState state,
out KMemoryPermission permission,
out MemoryAttribute attribute))
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
ulong pagesCount = size / PageSize;
attribute &= ~attributeMask;
attribute |= attributeMask & attributeValue;
_blockManager.InsertBlock(address, pagesCount, state, permission, attribute);
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KMemoryInfo QueryMemory(ulong address)
{
if (address >= AddrSpaceStart &&
address < AddrSpaceEnd)
{
lock (_blockManager)
{
return _blockManager.FindBlock(address).GetInfo();
}
}
else
{
return new KMemoryInfo(
AddrSpaceEnd,
~AddrSpaceEnd + 1,
MemoryState.Reserved,
KMemoryPermission.None,
MemoryAttribute.None,
KMemoryPermission.None,
0,
0);
}
}
public KernelResult Map(ulong dst, ulong src, ulong size)
{
bool success;
lock (_blockManager)
{
success = CheckRange(
src,
size,
MemoryState.MapAllowed,
MemoryState.MapAllowed,
KMemoryPermission.Mask,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState srcState,
out _,
out _);
success &= IsUnmapped(dst, size);
if (success)
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion * 2))
{
return KernelResult.OutOfResource;
}
ulong pagesCount = size / PageSize;
KernelResult result = MapMemory(src, dst, pagesCount, KMemoryPermission.ReadAndWrite, KMemoryPermission.ReadAndWrite);
if (result != KernelResult.Success)
{
return result;
}
_blockManager.InsertBlock(src, pagesCount, srcState, KMemoryPermission.None, MemoryAttribute.Borrowed);
_blockManager.InsertBlock(dst, pagesCount, MemoryState.Stack, KMemoryPermission.ReadAndWrite);
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult UnmapForKernel(ulong address, ulong pagesCount, MemoryState stateExpected)
{
ulong size = pagesCount * PageSize;
lock (_blockManager)
{
if (CheckRange(
address,
size,
MemoryState.Mask,
stateExpected,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out _,
out _,
out _))
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
KernelResult result = Unmap(address, pagesCount);
if (result == KernelResult.Success)
{
_blockManager.InsertBlock(address, pagesCount, MemoryState.Unmapped);
}
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult Unmap(ulong dst, ulong src, ulong size)
{
bool success;
lock (_blockManager)
{
success = CheckRange(
src,
size,
MemoryState.MapAllowed,
MemoryState.MapAllowed,
KMemoryPermission.Mask,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.Borrowed,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState srcState,
out _,
out _);
success &= CheckRange(
dst,
size,
MemoryState.Mask,
MemoryState.Stack,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out _,
out KMemoryPermission dstPermission,
out _);
if (success)
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion * 2))
{
return KernelResult.OutOfResource;
}
ulong pagesCount = size / PageSize;
KernelResult result = UnmapMemory(dst, src, pagesCount, dstPermission, KMemoryPermission.ReadAndWrite);
if (result != KernelResult.Success)
{
return result;
}
_blockManager.InsertBlock(src, pagesCount, srcState, KMemoryPermission.ReadAndWrite);
_blockManager.InsertBlock(dst, pagesCount, MemoryState.Unmapped);
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult SetProcessMemoryPermission(ulong address, ulong size, KMemoryPermission permission)
{
lock (_blockManager)
{
if (CheckRange(
address,
size,
MemoryState.ProcessPermissionChangeAllowed,
MemoryState.ProcessPermissionChangeAllowed,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState oldState,
out KMemoryPermission oldPermission,
out _))
{
MemoryState newState = oldState;
// If writing into the code region is allowed, then we need
// to change it to mutable.
if ((permission & KMemoryPermission.Write) != 0)
{
if (oldState == MemoryState.CodeStatic)
{
newState = MemoryState.CodeMutable;
}
else if (oldState == MemoryState.ModCodeStatic)
{
newState = MemoryState.ModCodeMutable;
}
else
{
throw new InvalidOperationException($"Memory state \"{oldState}\" not valid for this operation.");
}
}
if (newState != oldState || permission != oldPermission)
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
ulong pagesCount = size / PageSize;
KernelResult result;
if ((oldPermission & KMemoryPermission.Execute) != 0)
{
result = ReprotectWithAttributes(address, pagesCount, permission);
}
else
{
result = Reprotect(address, pagesCount, permission);
}
if (result != KernelResult.Success)
{
return result;
}
_blockManager.InsertBlock(address, pagesCount, newState, permission);
}
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult MapPhysicalMemory(ulong address, ulong size)
{
ulong endAddr = address + size;
lock (_blockManager)
{
ulong mappedSize = 0;
foreach (KMemoryInfo info in IterateOverRange(address, endAddr))
{
if (info.State != MemoryState.Unmapped)
{
mappedSize += GetSizeInRange(info, address, endAddr);
}
}
if (mappedSize == size)
{
return KernelResult.Success;
}
ulong remainingSize = size - mappedSize;
ulong remainingPages = remainingSize / PageSize;
KProcess currentProcess = KernelStatic.GetCurrentProcess();
if (currentProcess.ResourceLimit != null &&
!currentProcess.ResourceLimit.Reserve(LimitableResource.Memory, remainingSize))
{
return KernelResult.ResLimitExceeded;
}
KMemoryRegionManager region = GetMemoryRegionManager();
KernelResult result = region.AllocatePages(remainingPages, _aslrDisabled, out KPageList pageList);
using var _ = new OnScopeExit(() => pageList.DecrementPagesReferenceCount(Context.MemoryManager));
void CleanUpForError()
{
currentProcess.ResourceLimit?.Release(LimitableResource.Memory, remainingSize);
}
if (result != KernelResult.Success)
{
CleanUpForError();
return result;
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
CleanUpForError();
return KernelResult.OutOfResource;
}
LinkedListNode<KPageNode> pageListNode = pageList.Nodes.First;
KPageNode pageNode = pageListNode.Value;
ulong srcPa = pageNode.Address;
ulong srcPaPages = pageNode.PagesCount;
foreach (KMemoryInfo info in IterateOverRange(address, endAddr))
{
if (info.State != MemoryState.Unmapped)
{
continue;
}
ulong blockSize = GetSizeInRange(info, address, endAddr);
ulong dstVaPages = blockSize / PageSize;
ulong dstVa = GetAddrInRange(info, address);
while (dstVaPages > 0)
{
if (srcPaPages == 0)
{
pageListNode = pageListNode.Next;
pageNode = pageListNode.Value;
srcPa = pageNode.Address;
srcPaPages = pageNode.PagesCount;
}
ulong currentPagesCount = Math.Min(srcPaPages, dstVaPages);
MapPages(dstVa, currentPagesCount, srcPa, KMemoryPermission.ReadAndWrite);
dstVa += currentPagesCount * PageSize;
srcPa += currentPagesCount * PageSize;
srcPaPages -= currentPagesCount;
dstVaPages -= currentPagesCount;
}
}
PhysicalMemoryUsage += remainingSize;
ulong pagesCount = size / PageSize;
_blockManager.InsertBlock(
address,
pagesCount,
MemoryState.Unmapped,
KMemoryPermission.None,
MemoryAttribute.None,
MemoryState.Heap,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.None);
}
return KernelResult.Success;
}
public KernelResult UnmapPhysicalMemory(ulong address, ulong size)
{
ulong endAddr = address + size;
lock (_blockManager)
{
// Scan, ensure that the region can be unmapped (all blocks are heap or
// already unmapped), fill pages list for freeing memory.
ulong heapMappedSize = 0;
foreach (KMemoryInfo info in IterateOverRange(address, endAddr))
{
if (info.State == MemoryState.Heap)
{
if (info.Attribute != MemoryAttribute.None)
{
return KernelResult.InvalidMemState;
}
ulong blockSize = GetSizeInRange(info, address, endAddr);
heapMappedSize += blockSize;
}
else if (info.State != MemoryState.Unmapped)
{
return KernelResult.InvalidMemState;
}
}
if (heapMappedSize == 0)
{
return KernelResult.Success;
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
// Try to unmap all the heap mapped memory inside range.
KernelResult result = KernelResult.Success;
foreach (KMemoryInfo info in IterateOverRange(address, endAddr))
{
if (info.State == MemoryState.Heap)
{
ulong blockSize = GetSizeInRange(info, address, endAddr);
ulong blockAddress = GetAddrInRange(info, address);
ulong blockPagesCount = blockSize / PageSize;
result = Unmap(blockAddress, blockPagesCount);
// The kernel would attempt to remap if this fails, but we don't because:
// - The implementation may not support remapping if memory aliasing is not supported on the platform.
// - Unmap can't ever fail here anyway.
Debug.Assert(result == KernelResult.Success);
}
}
if (result == KernelResult.Success)
{
PhysicalMemoryUsage -= heapMappedSize;
KProcess currentProcess = KernelStatic.GetCurrentProcess();
currentProcess.ResourceLimit?.Release(LimitableResource.Memory, heapMappedSize);
ulong pagesCount = size / PageSize;
_blockManager.InsertBlock(address, pagesCount, MemoryState.Unmapped);
}
return result;
}
}
public KernelResult CopyDataToCurrentProcess(
ulong dst,
ulong size,
ulong src,
MemoryState stateMask,
MemoryState stateExpected,
KMemoryPermission permission,
MemoryAttribute attributeMask,
MemoryAttribute attributeExpected)
{
// Client -> server.
return CopyDataFromOrToCurrentProcess(
size,
src,
dst,
stateMask,
stateExpected,
permission,
attributeMask,
attributeExpected,
toServer: true);
}
public KernelResult CopyDataFromCurrentProcess(
ulong dst,
ulong size,
MemoryState stateMask,
MemoryState stateExpected,
KMemoryPermission permission,
MemoryAttribute attributeMask,
MemoryAttribute attributeExpected,
ulong src)
{
// Server -> client.
return CopyDataFromOrToCurrentProcess(
size,
dst,
src,
stateMask,
stateExpected,
permission,
attributeMask,
attributeExpected,
toServer: false);
}
private KernelResult CopyDataFromOrToCurrentProcess(
ulong size,
ulong clientAddress,
ulong serverAddress,
MemoryState stateMask,
MemoryState stateExpected,
KMemoryPermission permission,
MemoryAttribute attributeMask,
MemoryAttribute attributeExpected,
bool toServer)
{
if (AddrSpaceStart > clientAddress)
{
return KernelResult.InvalidMemState;
}
ulong srcEndAddr = clientAddress + size;
if (srcEndAddr <= clientAddress || srcEndAddr - 1 > AddrSpaceEnd - 1)
{
return KernelResult.InvalidMemState;
}
lock (_blockManager)
{
if (CheckRange(
clientAddress,
size,
stateMask,
stateExpected,
permission,
permission,
attributeMask | MemoryAttribute.Uncached,
attributeExpected))
{
KProcess currentProcess = KernelStatic.GetCurrentProcess();
while (size > 0)
{
ulong copySize = 0x100000; // Copy chunck size. Any value will do, moderate sizes are recommended.
if (copySize > size)
{
copySize = size;
}
if (toServer)
{
currentProcess.CpuMemory.Write(serverAddress, GetSpan(clientAddress, (int)copySize));
}
else
{
Write(clientAddress, currentProcess.CpuMemory.GetSpan(serverAddress, (int)copySize));
}
serverAddress += copySize;
clientAddress += copySize;
size -= copySize;
}
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult MapBufferFromClientProcess(
ulong size,
ulong src,
KPageTableBase srcPageTable,
KMemoryPermission permission,
MemoryState state,
bool send,
out ulong dst)
{
dst = 0;
lock (srcPageTable._blockManager)
{
lock (_blockManager)
{
KernelResult result = srcPageTable.ReprotectClientProcess(
src,
size,
permission,
state,
out int blocksNeeded);
if (result != KernelResult.Success)
{
return result;
}
if (!srcPageTable._slabManager.CanAllocate(blocksNeeded))
{
return KernelResult.OutOfResource;
}
ulong srcMapAddress = BitUtils.AlignUp(src, PageSize);
ulong srcMapEndAddr = BitUtils.AlignDown(src + size, PageSize);
ulong srcMapSize = srcMapEndAddr - srcMapAddress;
result = MapPagesFromClientProcess(size, src, permission, state, srcPageTable, send, out ulong va);
if (result != KernelResult.Success)
{
if (srcMapEndAddr > srcMapAddress)
{
srcPageTable.UnmapIpcRestorePermission(src, size, state);
}
return result;
}
if (srcMapAddress < srcMapEndAddr)
{
KMemoryPermission permissionMask = permission == KMemoryPermission.ReadAndWrite
? KMemoryPermission.None
: KMemoryPermission.Read;
srcPageTable._blockManager.InsertBlock(srcMapAddress, srcMapSize / PageSize, SetIpcMappingPermissions, permissionMask);
}
dst = va;
}
}
return KernelResult.Success;
}
private KernelResult ReprotectClientProcess(
ulong address,
ulong size,
KMemoryPermission permission,
MemoryState state,
out int blocksNeeded)
{
blocksNeeded = 0;
if (AddrSpaceStart > address)
{
return KernelResult.InvalidMemState;
}
ulong endAddr = address + size;
if (endAddr <= address || endAddr - 1 > AddrSpaceEnd - 1)
{
return KernelResult.InvalidMemState;
}
MemoryState stateMask;
switch (state)
{
case MemoryState.IpcBuffer0: stateMask = MemoryState.IpcSendAllowedType0; break;
case MemoryState.IpcBuffer1: stateMask = MemoryState.IpcSendAllowedType1; break;
case MemoryState.IpcBuffer3: stateMask = MemoryState.IpcSendAllowedType3; break;
default: return KernelResult.InvalidCombination;
}
KMemoryPermission permissionMask = permission == KMemoryPermission.ReadAndWrite
? KMemoryPermission.None
: KMemoryPermission.Read;
MemoryAttribute attributeMask = MemoryAttribute.Borrowed | MemoryAttribute.Uncached;
if (state == MemoryState.IpcBuffer0)
{
attributeMask |= MemoryAttribute.DeviceMapped;
}
ulong addressRounded = BitUtils.AlignUp(address, PageSize);
ulong addressTruncated = BitUtils.AlignDown(address, PageSize);
ulong endAddrRounded = BitUtils.AlignUp(endAddr, PageSize);
ulong endAddrTruncated = BitUtils.AlignDown(endAddr, PageSize);
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
ulong visitedSize = 0;
void CleanUpForError()
{
if (visitedSize == 0)
{
return;
}
ulong endAddrVisited = address + visitedSize;
foreach (KMemoryInfo info in IterateOverRange(addressRounded, endAddrVisited))
{
if ((info.Permission & KMemoryPermission.ReadAndWrite) != permissionMask && info.IpcRefCount == 0)
{
ulong blockAddress = GetAddrInRange(info, addressRounded);
ulong blockSize = GetSizeInRange(info, addressRounded, endAddrVisited);
ulong blockPagesCount = blockSize / PageSize;
KernelResult reprotectResult = Reprotect(blockAddress, blockPagesCount, info.Permission);
Debug.Assert(reprotectResult == KernelResult.Success);
}
}
}
// Signal a read for any resources tracking reads in the region, as the other process is likely to use their data.
SignalMemoryTracking(addressTruncated, endAddrRounded - addressTruncated, false);
// Reprotect the aligned pages range on the client to make them inaccessible from the client process.
KernelResult result;
if (addressRounded < endAddrTruncated)
{
foreach (KMemoryInfo info in IterateOverRange(addressRounded, endAddrTruncated))
{
// Check if the block state matches what we expect.
if ((info.State & stateMask) != stateMask ||
(info.Permission & permission) != permission ||
(info.Attribute & attributeMask) != MemoryAttribute.None)
{
CleanUpForError();
return KernelResult.InvalidMemState;
}
ulong blockAddress = GetAddrInRange(info, addressRounded);
ulong blockSize = GetSizeInRange(info, addressRounded, endAddrTruncated);
ulong blockPagesCount = blockSize / PageSize;
// If the first block starts before the aligned range, it will need to be split.
if (info.Address < addressRounded)
{
blocksNeeded++;
}
// If the last block ends after the aligned range, it will need to be split.
if (endAddrTruncated - 1 < info.Address + info.Size - 1)
{
blocksNeeded++;
}
if ((info.Permission & KMemoryPermission.ReadAndWrite) != permissionMask && info.IpcRefCount == 0)
{
result = Reprotect(blockAddress, blockPagesCount, permissionMask);
if (result != KernelResult.Success)
{
CleanUpForError();
return result;
}
}
visitedSize += blockSize;
}
}
return KernelResult.Success;
}
private KernelResult MapPagesFromClientProcess(
ulong size,
ulong address,
KMemoryPermission permission,
MemoryState state,
KPageTableBase srcPageTable,
bool send,
out ulong dst)
{
if (!SupportsMemoryAliasing)
{
throw new NotSupportedException("Memory aliasing not supported, can't map IPC buffers.");
}
dst = 0;
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
ulong endAddr = address + size;
ulong addressTruncated = BitUtils.AlignDown(address, PageSize);
ulong addressRounded = BitUtils.AlignUp(address, PageSize);
ulong endAddrTruncated = BitUtils.AlignDown(endAddr, PageSize);
ulong endAddrRounded = BitUtils.AlignUp(endAddr, PageSize);
ulong neededSize = endAddrRounded - addressTruncated;
ulong neededPagesCount = neededSize / PageSize;
ulong regionPagesCount = (AliasRegionEnd - AliasRegionStart) / PageSize;
ulong va = 0;
for (int unit = MappingUnitSizes.Length - 1; unit >= 0 && va == 0; unit--)
{
int alignment = MappingUnitSizes[unit];
va = AllocateVa(AliasRegionStart, regionPagesCount, neededPagesCount, alignment);
}
if (va == 0)
{
return KernelResult.OutOfVaSpace;
}
ulong dstFirstPagePa = 0;
ulong dstLastPagePa = 0;
ulong currentVa = va;
using var _ = new OnScopeExit(() =>
{
if (dstFirstPagePa != 0)
{
Context.MemoryManager.DecrementPagesReferenceCount(dstFirstPagePa, 1);
}
if (dstLastPagePa != 0)
{
Context.MemoryManager.DecrementPagesReferenceCount(dstLastPagePa, 1);
}
});
void CleanUpForError()
{
if (currentVa != va)
{
Unmap(va, (currentVa - va) / PageSize);
}
}
// Is the first page address aligned?
// If not, allocate a new page and copy the unaligned chunck.
if (addressTruncated < addressRounded)
{
dstFirstPagePa = GetMemoryRegionManager().AllocatePagesContiguous(Context, 1, _aslrDisabled);
if (dstFirstPagePa == 0)
{
CleanUpForError();
return KernelResult.OutOfMemory;
}
}
// Is the last page end address aligned?
// If not, allocate a new page and copy the unaligned chunck.
if (endAddrTruncated < endAddrRounded && (addressTruncated == addressRounded || addressTruncated < endAddrTruncated))
{
dstLastPagePa = GetMemoryRegionManager().AllocatePagesContiguous(Context, 1, _aslrDisabled);
if (dstLastPagePa == 0)
{
CleanUpForError();
return KernelResult.OutOfMemory;
}
}
if (dstFirstPagePa != 0)
{
ulong firstPageFillAddress = dstFirstPagePa;
ulong unusedSizeAfter;
if (send)
{
ulong unusedSizeBefore = address - addressTruncated;
Context.Memory.Fill(GetDramAddressFromPa(dstFirstPagePa), unusedSizeBefore, (byte)_ipcFillValue);
ulong copySize = addressRounded <= endAddr ? addressRounded - address : size;
var data = srcPageTable.GetSpan(addressTruncated + unusedSizeBefore, (int)copySize);
Context.Memory.Write(GetDramAddressFromPa(dstFirstPagePa + unusedSizeBefore), data);
firstPageFillAddress += unusedSizeBefore + copySize;
unusedSizeAfter = addressRounded > endAddr ? addressRounded - endAddr : 0;
}
else
{
unusedSizeAfter = PageSize;
}
if (unusedSizeAfter != 0)
{
Context.Memory.Fill(GetDramAddressFromPa(firstPageFillAddress), unusedSizeAfter, (byte)_ipcFillValue);
}
KernelResult result = MapPages(currentVa, 1, dstFirstPagePa, permission);
if (result != KernelResult.Success)
{
CleanUpForError();
return result;
}
currentVa += PageSize;
}
if (endAddrTruncated > addressRounded)
{
ulong alignedSize = endAddrTruncated - addressRounded;
KernelResult result = MapPages(currentVa, srcPageTable.GetPhysicalRegions(addressRounded, alignedSize), permission);
if (result != KernelResult.Success)
{
CleanUpForError();
return result;
}
currentVa += alignedSize;
}
if (dstLastPagePa != 0)
{
ulong lastPageFillAddr = dstLastPagePa;
ulong unusedSizeAfter;
if (send)
{
ulong copySize = endAddr - endAddrTruncated;
var data = srcPageTable.GetSpan(endAddrTruncated, (int)copySize);
Context.Memory.Write(GetDramAddressFromPa(dstLastPagePa), data);
lastPageFillAddr += copySize;
unusedSizeAfter = PageSize - copySize;
}
else
{
unusedSizeAfter = PageSize;
}
Context.Memory.Fill(GetDramAddressFromPa(lastPageFillAddr), unusedSizeAfter, (byte)_ipcFillValue);
KernelResult result = MapPages(currentVa, 1, dstLastPagePa, permission);
if (result != KernelResult.Success)
{
CleanUpForError();
return result;
}
}
_blockManager.InsertBlock(va, neededPagesCount, state, permission);
dst = va + (address - addressTruncated);
return KernelResult.Success;
}
public KernelResult UnmapNoAttributeIfStateEquals(ulong address, ulong size, MemoryState state)
{
if (AddrSpaceStart > address)
{
return KernelResult.InvalidMemState;
}
ulong endAddr = address + size;
if (endAddr <= address || endAddr - 1 > AddrSpaceEnd - 1)
{
return KernelResult.InvalidMemState;
}
lock (_blockManager)
{
if (CheckRange(
address,
size,
MemoryState.Mask,
state,
KMemoryPermission.Read,
KMemoryPermission.Read,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out _,
out _,
out _))
{
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
ulong addressTruncated = BitUtils.AlignDown(address, PageSize);
ulong addressRounded = BitUtils.AlignUp(address, PageSize);
ulong endAddrTruncated = BitUtils.AlignDown(endAddr, PageSize);
ulong endAddrRounded = BitUtils.AlignUp(endAddr, PageSize);
ulong pagesCount = (endAddrRounded - addressTruncated) / PageSize;
KernelResult result = Unmap(addressTruncated, pagesCount);
if (result == KernelResult.Success)
{
_blockManager.InsertBlock(addressTruncated, pagesCount, MemoryState.Unmapped);
}
return result;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult UnmapIpcRestorePermission(ulong address, ulong size, MemoryState state)
{
ulong endAddr = address + size;
ulong addressRounded = BitUtils.AlignUp(address, PageSize);
ulong addressTruncated = BitUtils.AlignDown(address, PageSize);
ulong endAddrRounded = BitUtils.AlignUp(endAddr, PageSize);
ulong endAddrTruncated = BitUtils.AlignDown(endAddr, PageSize);
ulong pagesCount = addressRounded < endAddrTruncated ? (endAddrTruncated - addressRounded) / PageSize : 0;
if (pagesCount == 0)
{
return KernelResult.Success;
}
MemoryState stateMask;
switch (state)
{
case MemoryState.IpcBuffer0: stateMask = MemoryState.IpcSendAllowedType0; break;
case MemoryState.IpcBuffer1: stateMask = MemoryState.IpcSendAllowedType1; break;
case MemoryState.IpcBuffer3: stateMask = MemoryState.IpcSendAllowedType3; break;
default: return KernelResult.InvalidCombination;
}
MemoryAttribute attributeMask =
MemoryAttribute.Borrowed |
MemoryAttribute.IpcMapped |
MemoryAttribute.Uncached;
if (state == MemoryState.IpcBuffer0)
{
attributeMask |= MemoryAttribute.DeviceMapped;
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
// Anything on the client side should see this memory as modified.
SignalMemoryTracking(addressTruncated, endAddrRounded - addressTruncated, true);
lock (_blockManager)
{
foreach (KMemoryInfo info in IterateOverRange(addressRounded, endAddrTruncated))
{
// Check if the block state matches what we expect.
if ((info.State & stateMask) != stateMask ||
(info.Attribute & attributeMask) != MemoryAttribute.IpcMapped)
{
return KernelResult.InvalidMemState;
}
if (info.Permission != info.SourcePermission && info.IpcRefCount == 1)
{
ulong blockAddress = GetAddrInRange(info, addressRounded);
ulong blockSize = GetSizeInRange(info, addressRounded, endAddrTruncated);
ulong blockPagesCount = blockSize / PageSize;
KernelResult result = Reprotect(blockAddress, blockPagesCount, info.SourcePermission);
if (result != KernelResult.Success)
{
return result;
}
}
}
_blockManager.InsertBlock(addressRounded, pagesCount, RestoreIpcMappingPermissions);
return KernelResult.Success;
}
}
private static void SetIpcMappingPermissions(KMemoryBlock block, KMemoryPermission permission)
{
block.SetIpcMappingPermission(permission);
}
private static void RestoreIpcMappingPermissions(KMemoryBlock block, KMemoryPermission permission)
{
block.RestoreIpcMappingPermission();
}
public KernelResult BorrowIpcBuffer(ulong address, ulong size)
{
return SetAttributesAndChangePermission(
address,
size,
MemoryState.IpcBufferAllowed,
MemoryState.IpcBufferAllowed,
KMemoryPermission.Mask,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.Mask,
MemoryAttribute.None,
KMemoryPermission.None,
MemoryAttribute.Borrowed);
}
public KernelResult BorrowTransferMemory(List<HostMemoryRange> ranges, ulong address, ulong size, KMemoryPermission permission)
{
return SetAttributesAndChangePermission(
address,
size,
MemoryState.TransferMemoryAllowed,
MemoryState.TransferMemoryAllowed,
KMemoryPermission.Mask,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.Mask,
MemoryAttribute.None,
permission,
MemoryAttribute.Borrowed,
ranges);
}
private KernelResult SetAttributesAndChangePermission(
ulong address,
ulong size,
MemoryState stateMask,
MemoryState stateExpected,
KMemoryPermission permissionMask,
KMemoryPermission permissionExpected,
MemoryAttribute attributeMask,
MemoryAttribute attributeExpected,
KMemoryPermission newPermission,
MemoryAttribute attributeSetMask,
List<HostMemoryRange> ranges = null)
{
if (address + size <= address || !InsideAddrSpace(address, size))
{
return KernelResult.InvalidMemState;
}
lock (_blockManager)
{
if (CheckRange(
address,
size,
stateMask | MemoryState.IsPoolAllocated,
stateExpected | MemoryState.IsPoolAllocated,
permissionMask,
permissionExpected,
attributeMask,
attributeExpected,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState oldState,
out KMemoryPermission oldPermission,
out MemoryAttribute oldAttribute))
{
ulong pagesCount = size / PageSize;
ranges?.AddRange(GetPhysicalRegions(address, size));
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
if (newPermission == KMemoryPermission.None)
{
newPermission = oldPermission;
}
if (newPermission != oldPermission)
{
KernelResult result = Reprotect(address, pagesCount, newPermission);
if (result != KernelResult.Success)
{
return result;
}
}
MemoryAttribute newAttribute = oldAttribute | attributeSetMask;
_blockManager.InsertBlock(address, pagesCount, oldState, newPermission, newAttribute);
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
public KernelResult UnborrowIpcBuffer(ulong address, ulong size)
{
return ClearAttributesAndChangePermission(
address,
size,
MemoryState.IpcBufferAllowed,
MemoryState.IpcBufferAllowed,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.Borrowed,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.Borrowed);
}
public KernelResult UnborrowTransferMemory(ulong address, ulong size, List<HostMemoryRange> ranges)
{
return ClearAttributesAndChangePermission(
address,
size,
MemoryState.TransferMemoryAllowed,
MemoryState.TransferMemoryAllowed,
KMemoryPermission.None,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.Borrowed,
KMemoryPermission.ReadAndWrite,
MemoryAttribute.Borrowed,
ranges);
}
private KernelResult ClearAttributesAndChangePermission(
ulong address,
ulong size,
MemoryState stateMask,
MemoryState stateExpected,
KMemoryPermission permissionMask,
KMemoryPermission permissionExpected,
MemoryAttribute attributeMask,
MemoryAttribute attributeExpected,
KMemoryPermission newPermission,
MemoryAttribute attributeClearMask,
List<HostMemoryRange> ranges = null)
{
if (address + size <= address || !InsideAddrSpace(address, size))
{
return KernelResult.InvalidMemState;
}
lock (_blockManager)
{
if (CheckRange(
address,
size,
stateMask | MemoryState.IsPoolAllocated,
stateExpected | MemoryState.IsPoolAllocated,
permissionMask,
permissionExpected,
attributeMask,
attributeExpected,
MemoryAttribute.IpcAndDeviceMapped,
out MemoryState oldState,
out KMemoryPermission oldPermission,
out MemoryAttribute oldAttribute))
{
ulong pagesCount = size / PageSize;
if (ranges != null)
{
var currentRanges = GetPhysicalRegions(address, size);
if (!currentRanges.SequenceEqual(ranges))
{
return KernelResult.InvalidMemRange;
}
}
if (!_slabManager.CanAllocate(MaxBlocksNeededForInsertion))
{
return KernelResult.OutOfResource;
}
if (newPermission == KMemoryPermission.None)
{
newPermission = oldPermission;
}
if (newPermission != oldPermission)
{
KernelResult result = Reprotect(address, pagesCount, newPermission);
if (result != KernelResult.Success)
{
return result;
}
}
MemoryAttribute newAttribute = oldAttribute & ~attributeClearMask;
_blockManager.InsertBlock(address, pagesCount, oldState, newPermission, newAttribute);
return KernelResult.Success;
}
else
{
return KernelResult.InvalidMemState;
}
}
}
private static ulong GetAddrInRange(KMemoryInfo info, ulong start)
{
if (info.Address < start)
{
return start;
}
return info.Address;
}
private static ulong GetSizeInRange(KMemoryInfo info, ulong start, ulong end)
{
ulong endAddr = info.Size + info.Address;
ulong size = info.Size;
if (info.Address < start)
{
size -= start - info.Address;
}
if (endAddr > end)
{
size -= endAddr - end;
}
return size;
}
private bool IsUnmapped(ulong address, ulong size)
{
return CheckRange(
address,
size,
MemoryState.Mask,
MemoryState.Unmapped,
KMemoryPermission.Mask,
KMemoryPermission.None,
MemoryAttribute.Mask,
MemoryAttribute.None,
MemoryAttribute.IpcAndDeviceMapped,
out _,
out _,
out _);
}
private bool CheckRange(
ulong address,
ulong size,
MemoryState stateMask,
MemoryState stateExpected,
KMemoryPermission permissionMask,
KMemoryPermission permissionExpected,
MemoryAttribute attributeMask,
MemoryAttribute attributeExpected,
MemoryAttribute attributeIgnoreMask,
out MemoryState outState,
out KMemoryPermission outPermission,
out MemoryAttribute outAttribute)
{
ulong endAddr = address + size;
LinkedListNode<KMemoryBlock> node = _blockManager.FindBlockNode(address);
KMemoryInfo info = node.Value.GetInfo();
MemoryState firstState = info.State;
KMemoryPermission firstPermission = info.Permission;
MemoryAttribute firstAttribute = info.Attribute;
do
{
info = node.Value.GetInfo();
// Check if the block state matches what we expect.
if (firstState != info.State ||
firstPermission != info.Permission ||
(info.Attribute & attributeMask) != attributeExpected ||
(firstAttribute | attributeIgnoreMask) != (info.Attribute | attributeIgnoreMask) ||
(firstState & stateMask) != stateExpected ||
(firstPermission & permissionMask) != permissionExpected)
{
outState = MemoryState.Unmapped;
outPermission = KMemoryPermission.None;
outAttribute = MemoryAttribute.None;
return false;
}
}
while (info.Address + info.Size - 1 < endAddr - 1 && (node = node.Next) != null);
outState = firstState;
outPermission = firstPermission;
outAttribute = firstAttribute & ~attributeIgnoreMask;
return true;
}
private bool CheckRange(
ulong address,
ulong size,
MemoryState stateMask,
MemoryState stateExpected,
KMemoryPermission permissionMask,
KMemoryPermission permissionExpected,
MemoryAttribute attributeMask,
MemoryAttribute attributeExpected)
{
foreach (KMemoryInfo info in IterateOverRange(address, address + size))
{
// Check if the block state matches what we expect.
if ((info.State & stateMask) != stateExpected ||
(info.Permission & permissionMask) != permissionExpected ||
(info.Attribute & attributeMask) != attributeExpected)
{
return false;
}
}
return true;
}
private IEnumerable<KMemoryInfo> IterateOverRange(ulong start, ulong end)
{
LinkedListNode<KMemoryBlock> node = _blockManager.FindBlockNode(start);
KMemoryInfo info;
do
{
info = node.Value.GetInfo();
yield return info;
}
while (info.Address + info.Size - 1 < end - 1 && (node = node.Next) != null);
}
private ulong AllocateVa(ulong regionStart, ulong regionPagesCount, ulong neededPagesCount, int alignment)
{
ulong address = 0;
ulong regionEndAddr = regionStart + regionPagesCount * PageSize;
ulong reservedPagesCount = _isKernel ? 1UL : 4UL;
if (_aslrEnabled)
{
ulong totalNeededSize = (reservedPagesCount + neededPagesCount) * PageSize;
ulong remainingPages = regionPagesCount - neededPagesCount;
ulong aslrMaxOffset = ((remainingPages + reservedPagesCount) * PageSize) / (ulong)alignment;
for (int attempt = 0; attempt < 8; attempt++)
{
address = BitUtils.AlignDown(regionStart + GetRandomValue(0, aslrMaxOffset) * (ulong)alignment, alignment);
ulong endAddr = address + totalNeededSize;
KMemoryInfo info = _blockManager.FindBlock(address).GetInfo();
if (info.State != MemoryState.Unmapped)
{
continue;
}
ulong currBaseAddr = info.Address + reservedPagesCount * PageSize;
ulong currEndAddr = info.Address + info.Size;
if (address >= regionStart &&
address >= currBaseAddr &&
endAddr - 1 <= regionEndAddr - 1 &&
endAddr - 1 <= currEndAddr - 1)
{
break;
}
}
if (address == 0)
{
ulong aslrPage = GetRandomValue(0, aslrMaxOffset);
address = FindFirstFit(
regionStart + aslrPage * PageSize,
regionPagesCount - aslrPage,
neededPagesCount,
alignment,
0,
reservedPagesCount);
}
}
if (address == 0)
{
address = FindFirstFit(
regionStart,
regionPagesCount,
neededPagesCount,
alignment,
0,
reservedPagesCount);
}
return address;
}
private ulong FindFirstFit(
ulong regionStart,
ulong regionPagesCount,
ulong neededPagesCount,
int alignment,
ulong reservedStart,
ulong reservedPagesCount)
{
ulong reservedSize = reservedPagesCount * PageSize;
ulong totalNeededSize = reservedSize + neededPagesCount * PageSize;
ulong regionEndAddr = regionStart + regionPagesCount * PageSize;
LinkedListNode<KMemoryBlock> node = _blockManager.FindBlockNode(regionStart);
KMemoryInfo info = node.Value.GetInfo();
while (regionEndAddr >= info.Address)
{
if (info.State == MemoryState.Unmapped)
{
ulong currBaseAddr = info.Address <= regionStart ? regionStart : info.Address;
ulong currEndAddr = info.Address + info.Size - 1;
currBaseAddr += reservedSize;
ulong address = BitUtils.AlignDown(currBaseAddr, alignment) + reservedStart;
if (currBaseAddr > address)
{
address += (ulong)alignment;
}
ulong allocationEndAddr = address + totalNeededSize - 1;
if (info.Address <= address &&
address < allocationEndAddr &&
allocationEndAddr <= regionEndAddr &&
allocationEndAddr <= currEndAddr)
{
return address;
}
}
node = node.Next;
if (node == null)
{
break;
}
info = node.Value.GetInfo();
}
return 0;
}
public bool CanContain(ulong address, ulong size, MemoryState state)
{
ulong endAddr = address + size;
ulong regionBaseAddr = GetBaseAddress(state);
ulong regionEndAddr = regionBaseAddr + GetSize(state);
bool InsideRegion()
{
return regionBaseAddr <= address &&
endAddr > address &&
endAddr - 1 <= regionEndAddr - 1;
}
bool OutsideHeapRegion()
{
return endAddr <= HeapRegionStart || address >= HeapRegionEnd;
}
bool OutsideAliasRegion()
{
return endAddr <= AliasRegionStart || address >= AliasRegionEnd;
}
switch (state)
{
case MemoryState.Io:
case MemoryState.Normal:
case MemoryState.CodeStatic:
case MemoryState.CodeMutable:
case MemoryState.SharedMemory:
case MemoryState.ModCodeStatic:
case MemoryState.ModCodeMutable:
case MemoryState.Stack:
case MemoryState.ThreadLocal:
case MemoryState.TransferMemoryIsolated:
case MemoryState.TransferMemory:
case MemoryState.ProcessMemory:
case MemoryState.CodeReadOnly:
case MemoryState.CodeWritable:
return InsideRegion() && OutsideHeapRegion() && OutsideAliasRegion();
case MemoryState.Heap:
return InsideRegion() && OutsideAliasRegion();
case MemoryState.IpcBuffer0:
case MemoryState.IpcBuffer1:
case MemoryState.IpcBuffer3:
return InsideRegion() && OutsideHeapRegion();
case MemoryState.KernelStack:
return InsideRegion();
}
throw new ArgumentException($"Invalid state value \"{state}\".");
}
private ulong GetBaseAddress(MemoryState state)
{
switch (state)
{
case MemoryState.Io:
case MemoryState.Normal:
case MemoryState.ThreadLocal:
return TlsIoRegionStart;
case MemoryState.CodeStatic:
case MemoryState.CodeMutable:
case MemoryState.SharedMemory:
case MemoryState.ModCodeStatic:
case MemoryState.ModCodeMutable:
case MemoryState.TransferMemoryIsolated:
case MemoryState.TransferMemory:
case MemoryState.ProcessMemory:
case MemoryState.CodeReadOnly:
case MemoryState.CodeWritable:
return GetAddrSpaceBaseAddr();
case MemoryState.Heap:
return HeapRegionStart;
case MemoryState.IpcBuffer0:
case MemoryState.IpcBuffer1:
case MemoryState.IpcBuffer3:
return AliasRegionStart;
case MemoryState.Stack:
return StackRegionStart;
case MemoryState.KernelStack:
return AddrSpaceStart;
}
throw new ArgumentException($"Invalid state value \"{state}\".");
}
private ulong GetSize(MemoryState state)
{
switch (state)
{
case MemoryState.Io:
case MemoryState.Normal:
case MemoryState.ThreadLocal:
return TlsIoRegionEnd - TlsIoRegionStart;
case MemoryState.CodeStatic:
case MemoryState.CodeMutable:
case MemoryState.SharedMemory:
case MemoryState.ModCodeStatic:
case MemoryState.ModCodeMutable:
case MemoryState.TransferMemoryIsolated:
case MemoryState.TransferMemory:
case MemoryState.ProcessMemory:
case MemoryState.CodeReadOnly:
case MemoryState.CodeWritable:
return GetAddrSpaceSize();
case MemoryState.Heap:
return HeapRegionEnd - HeapRegionStart;
case MemoryState.IpcBuffer0:
case MemoryState.IpcBuffer1:
case MemoryState.IpcBuffer3:
return AliasRegionEnd - AliasRegionStart;
case MemoryState.Stack:
return StackRegionEnd - StackRegionStart;
case MemoryState.KernelStack:
return AddrSpaceEnd - AddrSpaceStart;
}
throw new ArgumentException($"Invalid state value \"{state}\".");
}
public ulong GetAddrSpaceBaseAddr()
{
if (AddrSpaceWidth == 36 || AddrSpaceWidth == 39)
{
return 0x8000000;
}
else if (AddrSpaceWidth == 32)
{
return 0x200000;
}
else
{
throw new InvalidOperationException("Invalid address space width!");
}
}
public ulong GetAddrSpaceSize()
{
if (AddrSpaceWidth == 36)
{
return 0xff8000000;
}
else if (AddrSpaceWidth == 39)
{
return 0x7ff8000000;
}
else if (AddrSpaceWidth == 32)
{
return 0xffe00000;
}
else
{
throw new InvalidOperationException("Invalid address space width!");
}
}
private static ulong GetDramAddressFromPa(ulong pa)
{
return pa - DramMemoryMap.DramBase;
}
protected KMemoryRegionManager GetMemoryRegionManager()
{
return Context.MemoryManager.MemoryRegions[(int)_memRegion];
}
public long GetMmUsedPages()
{
lock (_blockManager)
{
return BitUtils.DivRoundUp(GetMmUsedSize(), PageSize);
}
}
private long GetMmUsedSize()
{
return _blockManager.BlocksCount * KMemoryBlockSize;
}
public bool IsInvalidRegion(ulong address, ulong size)
{
return address + size - 1 > GetAddrSpaceBaseAddr() + GetAddrSpaceSize() - 1;
}
public bool InsideAddrSpace(ulong address, ulong size)
{
return AddrSpaceStart <= address && address + size - 1 <= AddrSpaceEnd - 1;
}
public bool InsideAliasRegion(ulong address, ulong size)
{
return address + size > AliasRegionStart && AliasRegionEnd > address;
}
public bool InsideHeapRegion(ulong address, ulong size)
{
return address + size > HeapRegionStart && HeapRegionEnd > address;
}
public bool InsideStackRegion(ulong address, ulong size)
{
return address + size > StackRegionStart && StackRegionEnd > address;
}
public bool OutsideAliasRegion(ulong address, ulong size)
{
return AliasRegionStart > address || address + size - 1 > AliasRegionEnd - 1;
}
public bool OutsideAddrSpace(ulong address, ulong size)
{
return AddrSpaceStart > address || address + size - 1 > AddrSpaceEnd - 1;
}
public bool OutsideStackRegion(ulong address, ulong size)
{
return StackRegionStart > address || address + size - 1 > StackRegionEnd - 1;
}
/// <summary>
/// Gets the physical regions that make up the given virtual address region.
/// If any part of the virtual region is unmapped, null is returned.
/// </summary>
/// <param name="va">Virtual address of the range</param>
/// <param name="size">Size of the range</param>
/// <returns>Array of physical regions</returns>
protected abstract IEnumerable<HostMemoryRange> GetPhysicalRegions(ulong va, ulong size);
/// <summary>
/// Gets a read-only span of data from CPU mapped memory.
/// </summary>
/// <remarks>
/// This may perform a allocation if the data is not contiguous in memory.
/// For this reason, the span is read-only, you can't modify the data.
/// </remarks>
/// <param name="va">Virtual address of the data</param>
/// <param name="size">Size of the data</param>
/// <param name="tracked">True if read tracking is triggered on the span</param>
/// <returns>A read-only span of the data</returns>
/// <exception cref="Ryujinx.Memory.InvalidMemoryRegionException">Throw for unhandled invalid or unmapped memory accesses</exception>
protected abstract ReadOnlySpan<byte> GetSpan(ulong va, int size);
/// <summary>
/// Maps a new memory region with the contents of a existing memory region.
/// </summary>
/// <param name="src">Source memory region where the data will be taken from</param>
/// <param name="dst">Destination memory region to map</param>
/// <param name="pagesCount">Number of pages to map</param>
/// <param name="oldSrcPermission">Current protection of the source memory region</param>
/// <param name="newDstPermission">Desired protection for the destination memory region</param>
/// <returns>Result of the mapping operation</returns>
protected abstract KernelResult MapMemory(ulong src, ulong dst, ulong pagesCount, KMemoryPermission oldSrcPermission, KMemoryPermission newDstPermission);
/// <summary>
/// Unmaps a region of memory that was previously mapped with <see cref="MapMemory"/>.
/// </summary>
/// <param name="dst">Destination memory region to be unmapped</param>
/// <param name="src">Source memory region that was originally remapped</param>
/// <param name="pagesCount">Number of pages to unmap</param>
/// <param name="oldDstPermission">Current protection of the destination memory region</param>
/// <param name="newSrcPermission">Desired protection of the source memory region</param>
/// <returns>Result of the unmapping operation</returns>
protected abstract KernelResult UnmapMemory(ulong dst, ulong src, ulong pagesCount, KMemoryPermission oldDstPermission, KMemoryPermission newSrcPermission);
/// <summary>
/// Maps a region of memory into the specified physical memory region.
/// </summary>
/// <param name="dstVa">Destination virtual address that should be mapped</param>
/// <param name="pagesCount">Number of pages to map</param>
/// <param name="srcPa">Physical address where the pages should be mapped. May be ignored if aliasing is not supported</param>
/// <param name="permission">Permission of the region to be mapped</param>
/// <param name="shouldFillPages">Indicate if the pages should be filled with the <paramref name="fillValue"/> value</param>
/// <param name="fillValue">The value used to fill pages when <paramref name="shouldFillPages"/> is set to true</param>
/// <returns>Result of the mapping operation</returns>
protected abstract KernelResult MapPages(ulong dstVa, ulong pagesCount, ulong srcPa, KMemoryPermission permission, bool shouldFillPages = false, byte fillValue = 0);
/// <summary>
/// Maps a region of memory into the specified physical memory region.
/// </summary>
/// <param name="address">Destination virtual address that should be mapped</param>
/// <param name="pageList">List of physical memory pages where the pages should be mapped. May be ignored if aliasing is not supported</param>
/// <param name="permission">Permission of the region to be mapped</param>
/// <param name="shouldFillPages">Indicate if the pages should be filled with the <paramref name="fillValue"/> value</param>
/// <param name="fillValue">The value used to fill pages when <paramref name="shouldFillPages"/> is set to true</param>
/// <returns>Result of the mapping operation</returns>
protected abstract KernelResult MapPages(ulong address, KPageList pageList, KMemoryPermission permission, bool shouldFillPages = false, byte fillValue = 0);
/// <summary>
/// Maps a region of memory into the specified host memory ranges.
/// </summary>
/// <param name="address">Destination virtual address that should be mapped</param>
/// <param name="ranges">Ranges of host memory that should be mapped</param>
/// <param name="permission">Permission of the region to be mapped</param>
/// <returns>Result of the mapping operation</returns>
/// <exception cref="NotSupportedException">The implementation does not support memory aliasing</exception>
protected abstract KernelResult MapPages(ulong address, IEnumerable<HostMemoryRange> ranges, KMemoryPermission permission);
/// <summary>
/// Unmaps a region of memory that was previously mapped with one of the page mapping methods.
/// </summary>
/// <param name="address">Virtual address of the region to unmap</param>
/// <param name="pagesCount">Number of pages to unmap</param>
/// <returns>Result of the unmapping operation</returns>
protected abstract KernelResult Unmap(ulong address, ulong pagesCount);
/// <summary>
/// Changes the permissions of a given virtual memory region.
/// </summary>
/// <param name="address">Virtual address of the region to have the permission changes</param>
/// <param name="pagesCount">Number of pages to have their permissions changed</param>
/// <param name="permission">New permission</param>
/// <returns>Result of the permission change operation</returns>
protected abstract KernelResult Reprotect(ulong address, ulong pagesCount, KMemoryPermission permission);
/// <summary>
/// Changes the permissions of a given virtual memory region.
/// </summary>
/// <param name="address">Virtual address of the region to have the permission changes</param>
/// <param name="pagesCount">Number of pages to have their permissions changed</param>
/// <param name="permission">New permission</param>
/// <returns>Result of the permission change operation</returns>
protected abstract KernelResult ReprotectWithAttributes(ulong address, ulong pagesCount, KMemoryPermission permission);
/// <summary>
/// Alerts the memory tracking that a given region has been read from or written to.
/// This should be called before read/write is performed.
/// </summary>
/// <param name="va">Virtual address of the region</param>
/// <param name="size">Size of the region</param>
protected abstract void SignalMemoryTracking(ulong va, ulong size, bool write);
/// <summary>
/// Writes data to CPU mapped memory, with write tracking.
/// </summary>
/// <param name="va">Virtual address to write the data into</param>
/// <param name="data">Data to be written</param>
/// <exception cref="Ryujinx.Memory.InvalidMemoryRegionException">Throw for unhandled invalid or unmapped memory accesses</exception>
protected abstract void Write(ulong va, ReadOnlySpan<byte> data);
}
}
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