Ryujinx/Ryujinx.HLE/HOS/Kernel/Memory/KSharedMemory.cs

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using Ryujinx.Common;
using Ryujinx.HLE.HOS.Kernel.Common;
using Ryujinx.HLE.HOS.Kernel.Process;
namespace Ryujinx.HLE.HOS.Kernel.Memory
{
class KSharedMemory : KAutoObject
{
private readonly KPageList _pageList;
private readonly long _ownerPid;
private readonly MemoryPermission _ownerPermission;
private readonly MemoryPermission _userPermission;
public KSharedMemory(
KernelContext context,
KPageList pageList,
long ownerPid,
MemoryPermission ownerPermission,
MemoryPermission userPermission) : base(context)
{
_pageList = pageList;
_ownerPid = ownerPid;
_ownerPermission = ownerPermission;
_userPermission = userPermission;
}
public KernelResult MapIntoProcess(
KMemoryManager memoryManager,
ulong address,
ulong size,
KProcess process,
MemoryPermission permission)
{
ulong pagesCountRounded = BitUtils.DivRoundUp(size, KMemoryManager.PageSize);
if (_pageList.GetPagesCount() != pagesCountRounded)
{
return KernelResult.InvalidSize;
}
MemoryPermission expectedPermission = process.Pid == _ownerPid
? _ownerPermission
: _userPermission;
if (permission != expectedPermission)
{
return KernelResult.InvalidPermission;
}
return memoryManager.MapPages(address, _pageList, MemoryState.SharedMemory, permission);
}
public KernelResult UnmapFromProcess(
KMemoryManager memoryManager,
ulong address,
ulong size,
KProcess process)
{
ulong pagesCountRounded = BitUtils.DivRoundUp(size, KMemoryManager.PageSize);
if (_pageList.GetPagesCount() != pagesCountRounded)
{
return KernelResult.InvalidSize;
}
return memoryManager.UnmapPages(address, _pageList, MemoryState.SharedMemory);
}
}
}