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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 ulong _ownerPid;
private readonly KMemoryPermission _ownerPermission;
private readonly KMemoryPermission _userPermission;
public KSharedMemory(
KernelContext context,
SharedMemoryStorage storage,
ulong ownerPid,
KMemoryPermission ownerPermission,
KMemoryPermission userPermission) : base(context)
{
_pageList = storage.GetPageList();
_ownerPid = ownerPid;
_ownerPermission = ownerPermission;
_userPermission = userPermission;
}
public KernelResult MapIntoProcess(
KPageTableBase memoryManager,
ulong address,
ulong size,
KProcess process,
KMemoryPermission permission)
{
if (_pageList.GetPagesCount() != BitUtils.DivRoundUp(size, KPageTableBase.PageSize))
{
return KernelResult.InvalidSize;
}
KMemoryPermission expectedPermission = process.Pid == _ownerPid
? _ownerPermission
: _userPermission;
if (permission != expectedPermission)
{
return KernelResult.InvalidPermission;
}
return memoryManager.MapPages(address, _pageList, MemoryState.SharedMemory, permission);
}
public KernelResult UnmapFromProcess(KPageTableBase memoryManager, ulong address, ulong size, KProcess process)
{
if (_pageList.GetPagesCount() != BitUtils.DivRoundUp(size, KPageTableBase.PageSize))
{
return KernelResult.InvalidSize;
}
return memoryManager.UnmapPages(address, _pageList, MemoryState.SharedMemory);
}
}
}
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