Filesystem services

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fsp-srv

Cmd Name
1 #Initialize
2 MountRomFs
7 MountContent7
8 MountContent
11 OpenBisFileSystem
12 #OpenBisPartition
13 InvalidateBisCache
17 OpenHostFileSystemImpl
18 MountSdCard
19 FormatSdCard
21 DeleteSaveData
22 CreateSaveData
23 CreateSystemSaveData
24 RegisterSaveDataAtomicDeletion
25
26 FormatSdCardDryRun
27
30 OpenGameCardStorage?
31 MountGameCardPartition
51 MountSaveData
52 MountSystemSaveData
53 Returns an #IFileSystem.
58 ReadSaveDataFileSystemExtraData
59
60 OpenSaveDataInfoReader
61 OpenSaveDataIterator
80 OpenFileDirectly?
100 MountImageDirectory
110 #MountContentStorage
200 OpenRomFsStorage
202 OpenDataStorageByDataId
203 Returns an #IStorage.
400 #OpenDeviceOperator
500 #OpenSdCardDetectionEventNotifier
501 #OpenGameCardDetectionEventNotifier
600
601
602
603
604
605
606
607 RegisterExternalKey
608 UnregisterExternalKey
609
620
800
1000
1001
1002
1003 DisableAutoSaveDataCreation
1004 SetGlobalAccessLogMode
1005 GetGlobalAccessLogMode
1006 OutputAccessLogToSdCard

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 titleID. Web-applet loads the u32 from u32_table[inparam].

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 input u32(same as MountContent7), and an input u64 titleID.

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

Returns an #IFileSystem.

OpenBisPartition

Takes an unknown u32 that must be 0 otherwise 0x2EE202.

Returns an #IStorage that gives raw access to nand sectors containing the BCT.

MountContentStorage

Takes an unknown u32 that can be 0 or 1. If it's 2 then 0xFF202, otherwise 0x2EE202.

Returns an #IFileSystem with NCA files.

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.

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 ?
3 ?
4 GetStorageSize 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 MoveDirectory?
7 GetEntryType
8 OpenFile
9 OpenDirectory
10 CommitSaveData
11
12

IDirectory

Cmd Name
0 ReadEntries
1 GetNumberOfEntries

IFile

Cmd Name
0 Read
1 Write
2 Flush
3
4

ISaveDataInfoReader

IDeviceOperator

Cmd Name
0 IsSdCardInserted
1
2 GetSdCardCid
3
4
5
6
101
110
111
112
113
114
200 IsGameCardInserted
201
202 GetGameCardHandle
203 GetGameCardUpdatePartitionInfo
204
205 GetGameCardAttribute
206 GetGameCardDeviceCertificate
207
208
209
210
211
212
213
214
215
216
300
301

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.

IEventNotifier

Cmd Name
0 BindEvent

StorageId

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