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using Ryujinx.Horizon.Common;
using System.Diagnostics;
namespace Ryujinx.HLE.HOS.Kernel.Memory
{
class KMemoryRegionManager
{
private readonly KPageHeap _pageHeap;
public ulong Address { get; }
public ulong Size { get; }
public ulong EndAddr => Address + Size;
private readonly ushort[] _pageReferenceCounts;
public KMemoryRegionManager(ulong address, ulong size, ulong endAddr)
{
Address = address;
Size = size;
_pageReferenceCounts = new ushort[size / KPageTableBase.PageSize];
_pageHeap = new KPageHeap(address, size);
_pageHeap.Free(address, size / KPageTableBase.PageSize);
_pageHeap.UpdateUsedSize();
}
public Result AllocatePages(out KPageList pageList, ulong pagesCount)
{
if (pagesCount == 0)
{
pageList = new KPageList();
return Result.Success;
}
lock (_pageHeap)
{
Result result = AllocatePagesImpl(out pageList, pagesCount, false);
if (result == Result.Success)
{
foreach (var node in pageList)
{
IncrementPagesReferenceCount(node.Address, node.PagesCount);
}
}
return result;
}
}
public ulong AllocatePagesContiguous(KernelContext context, ulong pagesCount, bool backwards)
{
if (pagesCount == 0)
{
return 0;
}
lock (_pageHeap)
{
ulong address = AllocatePagesContiguousImpl(pagesCount, 1, backwards);
if (address != 0)
{
IncrementPagesReferenceCount(address, pagesCount);
context.CommitMemory(address - DramMemoryMap.DramBase, pagesCount * KPageTableBase.PageSize);
}
return address;
}
}
private Result AllocatePagesImpl(out KPageList pageList, ulong pagesCount, bool random)
{
pageList = new KPageList();
int heapIndex = KPageHeap.GetBlockIndex(pagesCount);
if (heapIndex < 0)
{
return KernelResult.OutOfMemory;
}
for (int index = heapIndex; index >= 0; index--)
{
ulong pagesPerAlloc = KPageHeap.GetBlockPagesCount(index);
while (pagesCount >= pagesPerAlloc)
{
ulong allocatedBlock = _pageHeap.AllocateBlock(index, random);
if (allocatedBlock == 0)
{
break;
}
Result result = pageList.AddRange(allocatedBlock, pagesPerAlloc);
if (result != Result.Success)
{
FreePages(pageList);
_pageHeap.Free(allocatedBlock, pagesPerAlloc);
return result;
}
pagesCount -= pagesPerAlloc;
}
}
if (pagesCount != 0)
{
FreePages(pageList);
return KernelResult.OutOfMemory;
}
return Result.Success;
}
private ulong AllocatePagesContiguousImpl(ulong pagesCount, ulong alignPages, bool random)
{
int heapIndex = KPageHeap.GetAlignedBlockIndex(pagesCount, alignPages);
ulong allocatedBlock = _pageHeap.AllocateBlock(heapIndex, random);
if (allocatedBlock == 0)
{
return 0;
}
ulong allocatedPages = KPageHeap.GetBlockPagesCount(heapIndex);
if (allocatedPages > pagesCount)
{
_pageHeap.Free(allocatedBlock + pagesCount * KPageTableBase.PageSize, allocatedPages - pagesCount);
}
return allocatedBlock;
}
public void FreePage(ulong address)
{
lock (_pageHeap)
{
_pageHeap.Free(address, 1);
}
}
public void FreePages(KPageList pageList)
{
lock (_pageHeap)
{
foreach (KPageNode pageNode in pageList)
{
_pageHeap.Free(pageNode.Address, pageNode.PagesCount);
}
}
}
public void FreePages(ulong address, ulong pagesCount)
{
lock (_pageHeap)
{
_pageHeap.Free(address, pagesCount);
}
}
public ulong GetFreePages()
{
lock (_pageHeap)
{
return _pageHeap.GetFreePagesCount();
}
}
public void IncrementPagesReferenceCount(ulong address, ulong pagesCount)
{
ulong index = GetPageOffset(address);
ulong endIndex = index + pagesCount;
while (index < endIndex)
{
ushort referenceCount = ++_pageReferenceCounts[index];
Debug.Assert(referenceCount >= 1);
index++;
}
}
public void DecrementPagesReferenceCount(ulong address, ulong pagesCount)
{
ulong index = GetPageOffset(address);
ulong endIndex = index + pagesCount;
ulong freeBaseIndex = 0;
ulong freePagesCount = 0;
while (index < endIndex)
{
Debug.Assert(_pageReferenceCounts[index] > 0);
ushort referenceCount = --_pageReferenceCounts[index];
if (referenceCount == 0)
{
if (freePagesCount != 0)
{
freePagesCount++;
}
else
{
freeBaseIndex = index;
freePagesCount = 1;
}
}
else if (freePagesCount != 0)
{
FreePages(Address + freeBaseIndex * KPageTableBase.PageSize, freePagesCount);
freePagesCount = 0;
}
index++;
}
if (freePagesCount != 0)
{
FreePages(Address + freeBaseIndex * KPageTableBase.PageSize, freePagesCount);
}
}
public ulong GetPageOffset(ulong address)
{
return (address - Address) / KPageTableBase.PageSize;
}
public ulong GetPageOffsetFromEnd(ulong address)
{
return (EndAddr - address) / KPageTableBase.PageSize;
}
}
}
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