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using Ryujinx.Common.Collections;
using Ryujinx.Horizon.Common;
using System.Diagnostics;
namespace Ryujinx.HLE.HOS.Kernel.Memory
{
class KMemoryBlockManager
{
private const int PageSize = KPageTableBase.PageSize;
private readonly IntrusiveRedBlackTree<KMemoryBlock> _blockTree;
public int BlocksCount => _blockTree.Count;
private KMemoryBlockSlabManager _slabManager;
private ulong _addrSpaceStart;
private ulong _addrSpaceEnd;
public KMemoryBlockManager()
{
_blockTree = new IntrusiveRedBlackTree<KMemoryBlock>();
}
public Result Initialize(ulong addrSpaceStart, ulong addrSpaceEnd, KMemoryBlockSlabManager slabManager)
{
_slabManager = slabManager;
_addrSpaceStart = addrSpaceStart;
_addrSpaceEnd = addrSpaceEnd;
// First insertion will always need only a single block, because there's nothing to split.
if (!slabManager.CanAllocate(1))
{
return KernelResult.OutOfResource;
}
ulong addrSpacePagesCount = (addrSpaceEnd - addrSpaceStart) / PageSize;
_blockTree.Add(new KMemoryBlock(
addrSpaceStart,
addrSpacePagesCount,
MemoryState.Unmapped,
KMemoryPermission.None,
MemoryAttribute.None));
return Result.Success;
}
public void InsertBlock(
ulong baseAddress,
ulong pagesCount,
MemoryState oldState,
KMemoryPermission oldPermission,
MemoryAttribute oldAttribute,
MemoryState newState,
KMemoryPermission newPermission,
MemoryAttribute newAttribute)
{
// Insert new block on the list only on areas where the state
// of the block matches the state specified on the old* state
// arguments, otherwise leave it as is.
int oldCount = _blockTree.Count;
oldAttribute |= MemoryAttribute.IpcAndDeviceMapped;
ulong endAddr = baseAddress + pagesCount * PageSize;
KMemoryBlock currBlock = FindBlock(baseAddress);
while (currBlock != null)
{
ulong currBaseAddr = currBlock.BaseAddress;
ulong currEndAddr = currBlock.PagesCount * PageSize + currBaseAddr;
if (baseAddress < currEndAddr && currBaseAddr < endAddr)
{
MemoryAttribute currBlockAttr = currBlock.Attribute | MemoryAttribute.IpcAndDeviceMapped;
if (currBlock.State != oldState ||
currBlock.Permission != oldPermission ||
currBlockAttr != oldAttribute)
{
currBlock = currBlock.Successor;
continue;
}
if (baseAddress > currBaseAddr)
{
KMemoryBlock newBlock = currBlock.SplitRightAtAddress(baseAddress);
_blockTree.Add(newBlock);
}
if (endAddr < currEndAddr)
{
KMemoryBlock newBlock = currBlock.SplitRightAtAddress(endAddr);
_blockTree.Add(newBlock);
currBlock = newBlock;
}
currBlock.SetState(newPermission, newState, newAttribute);
currBlock = MergeEqualStateNeighbors(currBlock);
}
if (currEndAddr - 1 >= endAddr - 1)
{
break;
}
currBlock = currBlock.Successor;
}
_slabManager.Count += _blockTree.Count - oldCount;
ValidateInternalState();
}
public void InsertBlock(
ulong baseAddress,
ulong pagesCount,
MemoryState state,
KMemoryPermission permission = KMemoryPermission.None,
MemoryAttribute attribute = MemoryAttribute.None)
{
// Inserts new block at the list, replacing and splitting
// existing blocks as needed.
int oldCount = _blockTree.Count;
ulong endAddr = baseAddress + pagesCount * PageSize;
KMemoryBlock currBlock = FindBlock(baseAddress);
while (currBlock != null)
{
ulong currBaseAddr = currBlock.BaseAddress;
ulong currEndAddr = currBlock.PagesCount * PageSize + currBaseAddr;
if (baseAddress < currEndAddr && currBaseAddr < endAddr)
{
if (baseAddress > currBaseAddr)
{
KMemoryBlock newBlock = currBlock.SplitRightAtAddress(baseAddress);
_blockTree.Add(newBlock);
}
if (endAddr < currEndAddr)
{
KMemoryBlock newBlock = currBlock.SplitRightAtAddress(endAddr);
_blockTree.Add(newBlock);
currBlock = newBlock;
}
currBlock.SetState(permission, state, attribute);
currBlock = MergeEqualStateNeighbors(currBlock);
}
if (currEndAddr - 1 >= endAddr - 1)
{
break;
}
currBlock = currBlock.Successor;
}
_slabManager.Count += _blockTree.Count - oldCount;
ValidateInternalState();
}
public delegate void BlockMutator(KMemoryBlock block, KMemoryPermission newPerm);
public void InsertBlock(
ulong baseAddress,
ulong pagesCount,
BlockMutator blockMutate,
KMemoryPermission permission = KMemoryPermission.None)
{
// Inserts new block at the list, replacing and splitting
// existing blocks as needed, then calling the callback
// function on the new block.
int oldCount = _blockTree.Count;
ulong endAddr = baseAddress + pagesCount * PageSize;
KMemoryBlock currBlock = FindBlock(baseAddress);
while (currBlock != null)
{
ulong currBaseAddr = currBlock.BaseAddress;
ulong currEndAddr = currBlock.PagesCount * PageSize + currBaseAddr;
if (baseAddress < currEndAddr && currBaseAddr < endAddr)
{
if (baseAddress > currBaseAddr)
{
KMemoryBlock newBlock = currBlock.SplitRightAtAddress(baseAddress);
_blockTree.Add(newBlock);
}
if (endAddr < currEndAddr)
{
KMemoryBlock newBlock = currBlock.SplitRightAtAddress(endAddr);
_blockTree.Add(newBlock);
currBlock = newBlock;
}
blockMutate(currBlock, permission);
currBlock = MergeEqualStateNeighbors(currBlock);
}
if (currEndAddr - 1 >= endAddr - 1)
{
break;
}
currBlock = currBlock.Successor;
}
_slabManager.Count += _blockTree.Count - oldCount;
ValidateInternalState();
}
[Conditional("DEBUG")]
private void ValidateInternalState()
{
ulong expectedAddress = 0;
KMemoryBlock currBlock = FindBlock(_addrSpaceStart);
while (currBlock != null)
{
Debug.Assert(currBlock.BaseAddress == expectedAddress);
expectedAddress = currBlock.BaseAddress + currBlock.PagesCount * PageSize;
currBlock = currBlock.Successor;
}
Debug.Assert(expectedAddress == _addrSpaceEnd);
}
private KMemoryBlock MergeEqualStateNeighbors(KMemoryBlock block)
{
KMemoryBlock previousBlock = block.Predecessor;
KMemoryBlock nextBlock = block.Successor;
if (previousBlock != null && BlockStateEquals(block, previousBlock))
{
_blockTree.Remove(block);
previousBlock.AddPages(block.PagesCount);
block = previousBlock;
}
if (nextBlock != null && BlockStateEquals(block, nextBlock))
{
_blockTree.Remove(nextBlock);
block.AddPages(nextBlock.PagesCount);
}
return block;
}
private static bool BlockStateEquals(KMemoryBlock lhs, KMemoryBlock rhs)
{
return lhs.State == rhs.State &&
lhs.Permission == rhs.Permission &&
lhs.Attribute == rhs.Attribute &&
lhs.SourcePermission == rhs.SourcePermission &&
lhs.DeviceRefCount == rhs.DeviceRefCount &&
lhs.IpcRefCount == rhs.IpcRefCount;
}
public KMemoryBlock FindBlock(ulong address)
{
return _blockTree.GetNodeByKey(address);
}
}
}
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