Filesystem services

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fsp-ldr

Cmd Name Arguments Notes
0 MountCode u64 TID + X descriptor #ContentPath Returns an #IFileSystem.
1 IsCodeMounted u64 PID Returns a bool (1 if code is mounted).

fsp-pr

Cmd Name Arguments Notes
0 SetFsPermissions u8 storageID, u32 PID, u64 TID, ACI0_buf_size, ACID_buf_size + two A descriptors (the 0x1C FS-access control from ACI0 + the 0x2C FS-access control from ACID). Actual FS permissions are set to (ACI0_perms & ACID_perms).
1 ClearFsPermissions u32 PID to clear
256 SetEnabledProgramVerification bool enabled

fsp-srv

Cmd Name
0 MountApplicationPackage
1 #Initialize
2 MountRomFs
7 #MountContent7
8 #MountContent
11 #MountBis
12 #OpenBisPartition
13 InvalidateBisCache
17 OpenHostFileSystemImpl
18 MountSdCard
19 FormatSdCard
21 #DeleteSaveData
22 #CreateSaveData
23 #CreateSystemSaveData
24 RegisterSaveDataAtomicDeletion
25
26 FormatSdCardDryRun
27
30 #OpenGameCardPartition
31 #MountGameCardPartition
51 #MountSaveData
52 #MountSystemSaveData
53 Returns an #IFileSystem.
58 ReadSaveDataFileSystemExtraData
59 WriteSaveDataFileSystemExtraData
60 OpenSaveDataInfoReader
61 OpenSaveDataIterator
80 OpenSaveDataThumbnailFile
100 MountImageDirectory
110 #MountContentStorage
200 OpenHost
202 OpenDataStorageByDataId
203 Returns an #IStorage.
400 #OpenDeviceOperator
500 #OpenSdCardDetectionEventNotifier
501 #OpenGameCardDetectionEventNotifier
600 SetCurrentPosixTime
601 QuerySaveDataTotalSize
602 #VerifySaveData
603 CorruptSaveDataForDebug
604 CreatePaddingFile
605 DeleteAllPaddingFiles
606 GetRightsId
607 RegisterExternalKey
608 UnregisterExternalKey
609
620 SetSdCardEncryptionSeed
800 GetAndClearFileSystemProxyErrorInfo
1000 SetBisRootForHost
1001 SetSaveDataSize
1002 SetSaveDataRootPath
1003 DisableAutoSaveDataCreation
1004 SetGlobalAccessLogMode
1005 GetGlobalAccessLogMode
1006 OutputAccessLogToSdCard

MountApplicationPackage

Presumably about the same as MountContent except this uses the titleID associated with the FS session?

Initialize

Word Value
0 0x00000004
1 0x8000000E
2 0x00000001
0-1 Pid
0 Always. 0x18000001
1 Always. 0
2 "SCFI"
3 0x00000001
4 Always 0.

MountContent7

Takes an input u32 (NCA-type) and an u64 title-id. Web-applet loads the u32 from u32_table[inparam]. Only type4 is usable with this?

Returns an #IFileSystem.

Note: web-applet strings refer to both this cmd and the below "MountContent" as "MountContent".

MountContent

Takes a type-0x19 input buffer, an in32, and an input title-id.

The in32 must be 5 if the NCA type is 0 (control).

The input buffer is the output string path from nsam GetContentNcaPath.

Returns an #IFileSystem.

May return errors when attempting to access NCA-paths for an update-title with a gamecard, when the gamecard isn't inserted. May return error 0x7D402 in some cases with update-titles. Non-val2 in32 values with NCA-type1 are unusable, even for normal titles.

MountBis

Takes a type-0x19 input buffer string and a u32 Bis partitionID(see below). Official user-process code sets instr[0] = 0 normally.

Returns an #IFileSystem.

Only partitionIDs for FAT partitions are usable with this, otherwise error 0x2EE202 is returned. Seems to be about the same as #OpenBisPartition except this mounts the partition filesystem instead of allowing direct access to the partition sectors.

OpenBisPartition

Takes a u32 partition ID, returns 0x2EE202 for partitions which do not exist, 0x320002 for partitions which cannot be opened and a valid #IStorage handle otherwise.

DeleteSaveData

Takes an input u64.

CreateSaveData

Takes a 0x40-byte Save-struct entry, a 0x40-byte SaveCreate-struct entry, and a 0x10-byte input struct.

Only the first 0x5-bytes in the 0x10-byte struct are initialized: all-zero when automatically creating savedata during savecommon mount by official user-processes. In the dedicated save-creation code in official user-processes: +0 u32 = 0x40060, +4 u8 = 1.

Creates regular savedata.

CreateSystemSaveData

Takes a 0x40-byte Save-struct entry and a 0x40-byte SaveCreate-struct entry.

Creates savedata in the SYSTEM NAND partition.

OpenGameCardPartition

Takes an input u32 (partition ID), and returns an #IStorage for the partition.

MountGameCardPartition

Takes two input u32s, with the second u32 located at +4 in rawdata after the first u32.

Returns an #IFileSystem.

Mounts a gamecard partition.

MountSaveData

Takes an input u8 and a 0x40-byte Save-struct entry. Official user-process code is only known to use value 1 for the u8.

Returns an #IFileSystem.

Permissions aren't checked until the specified save is successfully found.

Only one process can mount a given savedata at any given time (this includes systemsavedata).

MountSystemSaveData

Takes an input u8 and a 0x40-byte Save-struct entry. Web-applet only uses value0 for the input u8.

Returns an #IFileSystem.

Mounts savedata in the SYSTEM NAND partition.

MountContentStorage

Takes a #ContentStorageId. Invalid values return 0x2EE202.

Returns an #IFileSystem with NCA files. The read data from these files is identical to the data read by Content_Manager_services#ReadEntryRaw.

OpenDeviceOperator

This command returns a session to a port implementing the #IDeviceOperator interface.

OpenSdCardDetectionEventNotifier

This command returns a session to a port implementing the #IEventNotifier interface.

OpenGameCardDetectionEventNotifier

This command returns a session to a port implementing the #IEventNotifier interface.

VerifySaveData

Takes an unknown input u64 and a type-0x6 output buffer.

The input u64 high-byte must be non-zero, otherwise an error is returned(0xE02).

IStorage

This is the interface for a raw device, usually a block device.

Cmd Name Arguments
0 Read Takes a type-0x46 buffer, an offset and length
1 Write
2 Flush
3 SetSize
4 GetSize None

IFileSystem

There are two main implementations of this interface:

  • RomFS: Filesystem implementation statically linked in the binary. Uses an #IStorage interface as underlying raw device.
  • IPC proxy: Used for all non-RomFS filesystems. In this case, actual filesystem implementation is in the FS process.
Cmd Name
0 CreateFile
1 DeleteFile
2 CreateDirectory
3 DeleteDirectory
4 DeleteDirectoryRecursively
5 RenameFile
6 RenameDirectory
7 GetEntryType
8 OpenFile
9 OpenDirectory
10 Commit
11 GetFreeSpaceSize
12 GetTotalSpaceSize

Commit

Like 3DS, this has to be used after writing to savedata for the changes to take affect.

IDirectory

Cmd Name
0 Read
1 GetEntryCount

IFile

Cmd Name
0 Read
1 Write
2 Flush
3 SetSize
4 GetSize

ISaveDataInfoReader

IDeviceOperator

Cmd Name
0 IsSdCardInserted
1 GetSdCardSpeedMode
2 GetSdCardCid
3 GetSdCardUserAreaSize
4 GetSdCardProtectedAreaSize
5 GetAndClearSdCardErrorInfo
6
100 GetMmcCid
101 GetMmcSpeedMode
110 EraseMmc
111 GetMmcPartitionSize
112 GetMmcPatrolCount
113 GetAndClearMmcErrorInfo
114 GetMmcExtendedCsd
200 IsGameCardInserted
201 EraseGameCard
202 GetGameCardHandle
203 #GetGameCardUpdatePartitionInfo
204 FinalizeGameCardDriver
205 GetGameCardAttribute
206 GetGameCardDeviceCertificate
207 GetGameCardAsicInfo
208 GetGameCardIdSet
209 WriteToGameCard
210 SetVerifyWriteEnalbleFlag
211 GetGameCardImageHash
212 GetGameCardErrorInfo
213
214 GetGameCardCid
215
216
300 SetSpeedEmulationMode
301 GetSpeedEmulationMode

GetGameCardUpdatePartitionInfo

Returns a titleID and the title-version for it.

  • Output u32 with ARMS-gamecard: title-version v131162. This is the title-version for 2.1.0, which is the sysupdate included with this gamecard. Launch-day gamecards return title-version v450.
  • Output u64 with ARMS-gamecard: titleID 0100000000000816.

NS appears to only use this with Content_Manager_services#GetTitleIdInfo and Content_Manager_services#GetUpdateTitleList with storageid=nandsys, for checking whether a sysupdate is required.

IEventNotifier

Cmd Name
0 BindEvent

StorageId

Value Name
0 None
1 Host
2 GameCard
3 NandSystem
4 NandUser
5 SdCard

ContentStorageId

Value Name
0 NandSystem
1 NandUser
2 SdCard

ContentPath

These are the 0x300 paths to NCA files for the various filesystems FS can access, beginning with @. They're passed via X descriptors, and returned via various ncm/lr commands.

Path Notes
@GcApp Gamecard App partition (Partition 2)
@GcS00000001 Gamecard Contents.
@SdCardContent Installed SD card contents
@Sdcard Raw SD card partition
@SystemContent NandSystem partition.
@upp Gamecard update partition (Partition 0)
@UserContent NandUser partition.


BisPartitionID

  • 0: Raw NAND sectors access for MMC boot partition 0.
  • 10: Raw NAND sectors access for MMC boot partition 1.
  • Rest: see here.

Save Struct

Offset Size Description
0x0 0x8 0 for SystemSaveData. SaveData: 0 can be used for accessing the savedata associated with the current FS session titleID, otherwise when set this is the titleID associated with the savedata to access.
0x8 0x10 userID for user-specific savedata(saveuser) when set, otherwise when zero this indicates the common savedata(savecommon). This is loaded from Account_services.
0x18 0x8 u64 saveID. 0 for SaveData.
0x20 0x8 ContentStorageId? 0 for SystemSaveData. 1 for SaveData. 2 for DeviceSaveData(with official user-processes all other fields are 0 for DeviceSaveData).
0x28 0x8 0 for SystemSaveData/SaveData.
0x30 0x8 0 for SystemSaveData/SaveData.
0x38 0x8 0 for SystemSaveData/SaveData.

Total size is 0x40-bytes.

SaveCreate Struct

Offset Size Description
0x0 0x8 IVFC level4 size?
0x8 0x8 Same as offset 0x0 normally? Hard-coded to 0x80000 for BcatSaveData.
0x10 0x8 0x4000 for SystemSaveData/SaveData/DeviceSaveData/BcatSaveData. IVFC level4 block-size in bytes?
0x18 0x8 Official user-processes only uses 0 here for SystemSaveData/SaveData. For the dedicated save-creation code with SaveData/DeviceSaveData, this value comes from an input param with official user-processes. For BcatSaveData, this is the hard-coded titleID of the bcat-sysmodule.
0x20 0x4 Written using an input param for official user-processes. Hard-coded 0 for BcatSaveData.
0x24 0x1 Official user-processes only uses 0 here for SystemSaveData, 1 for SaveData/DeviceSaveData/BcatSaveData.
0x25 0x1 0 for SystemSaveData/SaveData.
0x26 0x1A Not initialized for SystemSaveData/SaveData.

Total size is 0x40-bytes.

DeviceSaveData

This is accessed using the same commands for SaveData with the same input u8, the only difference compared to SaveData is the Save-struct.

BcatSaveData

This is accessed using the same commands for SaveData with the same input u8. The Save-struct is the same as DeviceSaveData, except that the titleID field is set to <input titleID>. See above regarding SaveCreate-struct.

The 0x10-byte struct passed to #CreateSaveData has the first 0x5-bytes set to all-zero.

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