diff --git a/src/LibHac/FsService/IDeviceOperator.cs b/src/LibHac/FsService/IDeviceOperator.cs
index 943b71fe..bbb5b218 100644
--- a/src/LibHac/FsService/IDeviceOperator.cs
+++ b/src/LibHac/FsService/IDeviceOperator.cs
@@ -2,6 +2,8 @@
 {
     public interface IDeviceOperator
     {
-        
+        Result IsSdCardInserted(out bool isInserted);
+        Result IsGameCardInserted(out bool isInserted);
+        Result GetGameCardHandle(out GameCardHandle handle);
     }
 }
\ No newline at end of file
diff --git a/src/LibHac/FsService/Permissions.cs b/src/LibHac/FsService/Permissions.cs
new file mode 100644
index 00000000..aa773235
--- /dev/null
+++ b/src/LibHac/FsService/Permissions.cs
@@ -0,0 +1,169 @@
+using System;
+
+namespace LibHac.FsService
+{
+    /// <summary>
+    /// Permissions that control which storages or filesystems can be mounted or opened.
+    /// </summary>
+    public enum AccessPermissions
+    {
+        MountLogo = 0x0,
+        MountContentMeta = 0x1,
+        MountContentControl = 0x2,
+        MountContentManual = 0x3,
+        MountContentData = 0x4,
+        MountApplicationPackage = 0x5,
+        MountSaveDataStorage = 0x6,
+        MountContentStorage = 0x7,
+        MountImageAndVideoStorage = 0x8,
+        MountCloudBackupWorkStorage = 0x9,
+        MountCustomStorage = 0xA,
+        MountBisCalibrationFile = 0xB,
+        MountBisSafeMode = 0xC,
+        MountBisUser = 0xD,
+        MountBisSystem = 0xE,
+        MountBisSystemProperEncryption = 0xF,
+        MountBisSystemProperPartition = 0x10,
+        MountSdCard = 0x11,
+        MountGameCard = 0x12,
+        MountDeviceSaveData = 0x13,
+        MountSystemSaveData = 0x14,
+        MountOthersSaveData = 0x15,
+        MountOthersSystemSaveData = 0x16,
+        OpenBisPartitionBootPartition1Root = 0x17,
+        OpenBisPartitionBootPartition2Root = 0x18,
+        OpenBisPartitionUserDataRoot = 0x19,
+        OpenBisPartitionBootConfigAndPackage2Part1 = 0x1A,
+        OpenBisPartitionBootConfigAndPackage2Part2 = 0x1B,
+        OpenBisPartitionBootConfigAndPackage2Part3 = 0x1C,
+        OpenBisPartitionBootConfigAndPackage2Part4 = 0x1D,
+        OpenBisPartitionBootConfigAndPackage2Part5 = 0x1E,
+        OpenBisPartitionBootConfigAndPackage2Part6 = 0x1F,
+        OpenBisPartitionCalibrationBinary = 0x20,
+        OpenBisPartitionCalibrationFile = 0x21,
+        OpenBisPartitionSafeMode = 0x22,
+        OpenBisPartitionUser = 0x23,
+        OpenBisPartitionSystem = 0x24,
+        OpenBisPartitionSystemProperEncryption = 0x25,
+        OpenBisPartitionSystemProperPartition = 0x26,
+        OpenSdCardStorage = 0x27,
+        OpenGameCardStorage = 0x28,
+        MountSystemDataPrivate = 0x29,
+        MountHost = 0x2A,
+        MountRegisteredUpdatePartition = 0x2B,
+        MountSaveDataInternalStorage = 0x2C,
+        NotMountCustomStorage = 0x2D
+    }
+
+    /// <summary>
+    /// Permissions that control which actions can be performed.
+    /// </summary>
+    public enum ActionPermissions
+    {
+        // Todo
+    }
+
+    public static class PermissionUtils
+    {
+        public static ulong GetPermissionMask(AccessPermissions id)
+        {
+            switch (id)
+            {
+                case AccessPermissions.MountLogo:
+                    return 0x8000000000000801;
+                case AccessPermissions.MountContentMeta:
+                    return 0x8000000000000801;
+                case AccessPermissions.MountContentControl:
+                    return 0x8000000000000801;
+                case AccessPermissions.MountContentManual:
+                    return 0x8000000000000801;
+                case AccessPermissions.MountContentData:
+                    return 0x8000000000000801;
+                case AccessPermissions.MountApplicationPackage:
+                    return 0x8000000000000801;
+                case AccessPermissions.MountSaveDataStorage:
+                    return 0x8000000000000000;
+                case AccessPermissions.MountContentStorage:
+                    return 0x8000000000000800;
+                case AccessPermissions.MountImageAndVideoStorage:
+                    return 0x8000000000001000;
+                case AccessPermissions.MountCloudBackupWorkStorage:
+                    return 0x8000000200000000;
+                case AccessPermissions.MountCustomStorage:
+                    return 0x8000000000000000;
+                case AccessPermissions.MountBisCalibrationFile:
+                    return 0x8000000000000084;
+                case AccessPermissions.MountBisSafeMode:
+                    return 0x8000000000000080;
+                case AccessPermissions.MountBisUser:
+                    return 0x8000000000008080;
+                case AccessPermissions.MountBisSystem:
+                    return 0x8000000000008080;
+                case AccessPermissions.MountBisSystemProperEncryption:
+                    return 0x8000000000000080;
+                case AccessPermissions.MountBisSystemProperPartition:
+                    return 0x8000000000000080;
+                case AccessPermissions.MountSdCard:
+                    return 0xC000000000200000;
+                case AccessPermissions.MountGameCard:
+                    return 0x8000000000000010;
+                case AccessPermissions.MountDeviceSaveData:
+                    return 0x8000000000040020;
+                case AccessPermissions.MountSystemSaveData:
+                    return 0x8000000000000028;
+                case AccessPermissions.MountOthersSaveData:
+                    return 0x8000000000000020;
+                case AccessPermissions.MountOthersSystemSaveData:
+                    return 0x8000000000000020;
+                case AccessPermissions.OpenBisPartitionBootPartition1Root:
+                    return 0x8000000000010082;
+                case AccessPermissions.OpenBisPartitionBootPartition2Root:
+                    return 0x8000000000010080;
+                case AccessPermissions.OpenBisPartitionUserDataRoot:
+                    return 0x8000000000000080;
+                case AccessPermissions.OpenBisPartitionBootConfigAndPackage2Part1:
+                    return 0x8000000000010080;
+                case AccessPermissions.OpenBisPartitionBootConfigAndPackage2Part2:
+                    return 0x8000000000010080;
+                case AccessPermissions.OpenBisPartitionBootConfigAndPackage2Part3:
+                    return 0x8000000000010080;
+                case AccessPermissions.OpenBisPartitionBootConfigAndPackage2Part4:
+                    return 0x8000000000010080;
+                case AccessPermissions.OpenBisPartitionBootConfigAndPackage2Part5:
+                    return 0x8000000000010080;
+                case AccessPermissions.OpenBisPartitionBootConfigAndPackage2Part6:
+                    return 0x8000000000010080;
+                case AccessPermissions.OpenBisPartitionCalibrationBinary:
+                    return 0x8000000000000084;
+                case AccessPermissions.OpenBisPartitionCalibrationFile:
+                    return 0x8000000000000084;
+                case AccessPermissions.OpenBisPartitionSafeMode:
+                    return 0x8000000000000080;
+                case AccessPermissions.OpenBisPartitionUser:
+                    return 0x8000000000000080;
+                case AccessPermissions.OpenBisPartitionSystem:
+                    return 0x8000000000000080;
+                case AccessPermissions.OpenBisPartitionSystemProperEncryption:
+                    return 0x8000000000000080;
+                case AccessPermissions.OpenBisPartitionSystemProperPartition:
+                    return 0x8000000000000080;
+                case AccessPermissions.OpenSdCardStorage:
+                    return 0xC000000000200000;
+                case AccessPermissions.OpenGameCardStorage:
+                    return 0x8000000000000100;
+                case AccessPermissions.MountSystemDataPrivate:
+                    return 0x8000000000100008;
+                case AccessPermissions.MountHost:
+                    return 0xC000000000400000;
+                case AccessPermissions.MountRegisteredUpdatePartition:
+                    return 0x8000000000010000;
+                case AccessPermissions.MountSaveDataInternalStorage:
+                    return 0x8000000000000000;
+                case AccessPermissions.NotMountCustomStorage:
+                    return 0x0;
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(id), id, null);
+            }
+        }
+    }
+}