Filesystem services

fsp-srv

Cmd	Name
1	#Initialize
2	MountRomFs
7	MountContent7
8	MountContent
11	Returns an #IFileSystem.
12	OpenBisPartition
13
17	OpenHostFileSystemImpl
18	MountSdCard
19	FormatSdCard
21	DeleteSaveData
22
23	CreateSystemSaveData
24	RegisterSaveDataAtomicDeletion
25
26	FormatSdCardDryRun
27
30	OpenGameCardStorage?
31	MountGameCardPartition
51	Returns an #IFileSystem.
52	MountSystemSaveData
53	Returns an #IFileSystem.
58	ReadSaveDataFileSystemExtraData
59
60	Returns an #ISaveDataInfoReader.
61	OpenSaveDataIterator
80	OpenFileDirectly?
100	MountImageDirectory
110	Returns an #IFileSystem.
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
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 and an u64 titleID. It's unknown what the u32 is.

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.

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

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