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using Ryujinx.Common;
using Ryujinx.HLE.HOS.Kernel.Common;
using Ryujinx.HLE.HOS.Kernel.Process;
using Ryujinx.Horizon.Common;
using Ryujinx.Memory;
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 Result MapIntoProcess(
KPageTableBase memoryManager,
ulong address,
ulong size,
KProcess process,
KMemoryPermission permission)
{
if (_pageList.GetPagesCount() != BitUtils.DivRoundUp<ulong>(size, KPageTableBase.PageSize))
{
return KernelResult.InvalidSize;
}
KMemoryPermission expectedPermission = process.Pid == _ownerPid
? _ownerPermission
: _userPermission;
if (permission != expectedPermission)
{
return KernelResult.InvalidPermission;
}
// On platforms with page size > 4 KB, this can fail due to the address not being page aligned,
// we can return an error to force the application to retry with a different address.
try
{
return memoryManager.MapPages(address, _pageList, MemoryState.SharedMemory, permission);
}
catch (InvalidMemoryRegionException)
{
return KernelResult.InvalidMemState;
}
}
public Result UnmapFromProcess(KPageTableBase memoryManager, ulong address, ulong size, KProcess process)
{
if (_pageList.GetPagesCount() != BitUtils.DivRoundUp<ulong>(size, KPageTableBase.PageSize))
{
return KernelResult.InvalidSize;
}
return memoryManager.UnmapPages(address, _pageList, MemoryState.SharedMemory);
}
}
}
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