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using Ryujinx.Common;
namespace Ryujinx.HLE.HOS.Kernel
{
class KSharedMemory
{
private KPageList PageList;
private long OwnerPid;
private MemoryPermission OwnerPermission;
private MemoryPermission UserPermission;
public KSharedMemory(
KPageList PageList,
long OwnerPid,
MemoryPermission OwnerPermission,
MemoryPermission UserPermission)
{
this.PageList = PageList;
this.OwnerPid = OwnerPid;
this.OwnerPermission = OwnerPermission;
this.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);
}
}
}
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