Filesystem services

Filesystem service "fs:USER"

You can at most have 32 FS archive handles.

Command Header	Available since system version	Description	Required exheader access info bitmask
0x000100C6	?	Dummy1	None
0x040100C4	?	Control	None
0x08010002	?	Initialize	None
0x080201C2	?	OpenFile	None
0x08030204	?	OpenFileDirectly	None
0x08040142	?	DeleteFile	None
0x08050244	?	RenameFile	None
0x08060142	?	DeleteDirectory	None
0x08070142	?	DeleteDirectoryRecursively	None
0x08080202	?	CreateFile	None
0x08090182	?	CreateDirectory	None
0x080A0244	?	RenameDirectory	None
0x080B0102	?	OpenDirectory	None
0x080C00C2	?	OpenArchive	Each archive ID code has separate access info bitmasks, if it has any
0x080D0144	?	ControlArchive	None
0x080E0080	?	CloseArchive	None
0x080F0180	?	FormatThisUserSaveData	None
0x08100200	?	CreateSystemSaveData	0x4, for when the input saveID doesn't match the exheader saveID
0x08110040	?	DeleteSystemSaveData	0x1004, for when the input saveID doesn't match the exheader saveID
0x08120080	?	GetFreeBytes	None
0x08130000	?	GetCardType	0x1017
0x08140000	?	GetSdmcArchiveResource	None
0x08150000	?	GetNandArchiveResource	None
0x08160000	?	GetSdmcFatfsError	0x2
0x08170000	?	IsSdmcDetected	None
0x08180000	?	IsSdmcWritable	None
0x08190042	?	GetSdmcCid	0x2
0x081A0042	?	GetNandCid	0x2
0x081B0000	?	GetSdmcSpeedInfo	0x2
0x081C0000	?	GetNandSpeedInfo	0x2
0x081D0042	?	GetSdmcLog	0x2
0x081E0042	?	GetNandLog	0x2
0x081F0000	?	ClearSdmcLog	0x2
0x08200000	?	ClearNandLog	0x2
0x08210000	?	CardSlotIsInserted	0x1017
0x08220000	?	CardSlotPowerOn	0x2
0x08230000	?	CardSlotPowerOff	0x2
0x08240000	?	CardSlotGetCardIFPowerStatus	0x2
0x08250040	?	CardNorDirectCommand	0x2
0x08260080	?	CardNorDirectCommandWithAddress	0x2
0x08270082	?	CardNorDirectRead	0x2
0x082800C2	?	CardNorDirectReadWithAddress	0x2
0x08290082	?	CardNorDirectWrite	0x2
0x082A00C2	?	CardNorDirectWriteWithAddress	0x2
0x082B00C2	?	CardNorDirectRead_4xIO	0x2
0x082C0082	?	CardNorDirectCpuWriteWithoutVerify	0x2
0x082D0040	?	CardNorDirectSectorEraseWithoutVerify	0x2
0x082E0040	?	GetProductInfo	0x1005
0x082F0040	?	GetProgramLaunchInfo	0x1005
0x08300182	?	CreateExtSaveData	0xC, for when the input extdataID doesn't match the exheader extdataID
0x08310180	?	CreateSharedExtSaveData	0x1005
0x08320102	?	ReadExtSaveDataIcon	0x100D, for when the input extdataID doesn't match the exheader extdataID
0x08330082	?	EnumerateExtSaveData	0x1005
0x08340082	?	EnumerateSharedExtSaveData	0x1005
0x08350080	?	DeleteExtSaveData	0x100D, for when the input extdataID doesn't match the exheader extdataID
0x08360080	?	DeleteSharedExtSaveData	0x1005
0x08370040	?	SetCardSpiBaudRate	0x2
0x08380040	?	SetCardSpiBusMode	0x2
0x08390000	?	SendInitializeInfoTo9	None
0x083A0100	?	GetSpecialContentIndex	0x1005
0x083B00C2	?	GetLegacyRomHeader	0x1015
0x083C00C2	?	GetLegacyBannerData	0x1015
0x083D0100	?	CheckAuthorityToAccessExtSaveData	0x44
0x083E00C2	?	QueryTotalQuotaSize	None
0x083F00C0	?	GetExtDataBlockSize	None
0x08400040	?	AbnegateAccessRight	?
0x08410000	?	DeleteSdmcRoot	0x1005
0x08420040	?	DeleteAllExtSaveDataOnNand	0x1005
0x08430000	?	InitializeCtrFileSystem	None
0x08440000	?	CreateSeed	0x2
0x084500C2	?	GetFormatInfo	?
0x08460102	?	GetLegacyRomHeader2	0x1015
0x08470180	?	FormatCtrCardUserSaveData	0x6
0x08480042	?	GetSdmcCtrRootPath	0x100D
0x08490040	?	GetArchiveResource	?
0x084A0002	?	ExportIntegrityVerificationSeed	0x4000
0x084B0002	?	ImportIntegrityVerificationSeed	0x4000
0x084C0242	?	FormatSaveData	0x6, in some cases this write isn't needed however
0x084D0102	?	GetLegacySubBannerData	0x1015
0x084E0342	?	UpdateSha256Context	0x5
0x084F0102	?	ReadSpecialFile	None
0x08500040	?	GetSpecialFileSize	None
0x08510242	3.0.0-5	CreateExtSaveData	Shared extdata: 0x101005. Regular extdata in certain cases: 0xC
0x08520100	3.0.0-5	DeleteExtSaveData (u32 flags, u64 extdataID)	Shared extdata: 0x101005. Regular extdata in certain cases: 0x10100D
0x08530142	3.0.0-5	ReadExtSaveDataIcon	0x10100D (this doesn't apply in certain cases, however)
0x085400C0	3.0.0-5	GetExtDataBlockSize?	0x10100D (this doesn't apply in certain cases, however)
0x08550102	3.0.0-5	EnumerateExtSaveData	0x101005
0x08560200	3.0.0-5	FsCreateSystemSaveData?	0x4 (this doesn't apply in certain cases, however)
0x08570080	3.0.0-5	DeleteSystemSaveData	0x1004 (this doesn't apply in certain cases, however)
0x08580000	3.0.0-5	GetMovableSedHashedKeyYRandomData	0x2004
0x08590200	3.0.0-5	SetMovableSedHashedKeyYRandomData?	0x2004
0x085A00C0	3.0.0-5	SetArchivePriority(u64 ID,u32 priority)	None
0x085B0080	3.0.0-5	GetArchivePriority(u64 ID,u32 *priority)	None
0x085C00C0	3.0.0-5	SetCtrCardLatencyParameter	0xE
0x085D0180	3.0.0-5	?	0x100001
0x085E0040	3.0.0-5	ResetCardCompatibilityParameter	0xE
0x085F0040	3.0.0-5	SwitchCleanupInvalidSaveData	0x12004
0x08600042	3.0.0-5	EnumerateSystemSaveData	0x2004
0x08610042	3.0.0-5	InitializeWithSdkVersion	None
0x08620040	3.0.0-5	SetPriority	None
0x08630000	3.0.0-5	GetPriority	None
0x08640000	3.0.0-5	Obsoleted_4_0_GetNandInfo Stubbed, this returns an error	None
0x08650140	4.0.0-7	SetSaveDataSecureValue, this is used with Anti Savegame Restore.	0x121004 (in certain cases this doesn't apply, however)
0x086600C0	4.0.0-7	GetSaveDataSecureValue, this is used with Anti Savegame Restore.	0x121004 (in certain cases this doesn't apply, however)
0x086700C4	4.0.0-7	ControlSecureSave	0x121004
0x08680000	4.0.0-7	GetMediaType, This loads the u8 mediatype for the current application from already initialized state, this u8 was originally loaded from the same data used by GetProgramLaunchInfo. This then writes the u8 to response-word[2]. This is used with Anti Savegame Restore	None
0x08690000	4.0.0-7	Obsoleted_4_0_GetNandEraseCount Stubbed, this returns an error.	None
0x086A0082	4.0.0-7	ReadNandReport This is a wrapper for FSPXI command 0x00550082.	None
0x086B00C2	?	?	00121004
0x086C00C2	?	?	00121004
0x086D0040	?	?	00020004
0x086E00C0	?	?	None?
0x086F0040	?	?	0xE
0x087000C2	?	?	None?
0x08710100	?	?	0xC
0x087201C0	?	?	00080004
0x087300C0	?	?	00080004
0x08740000	?	?	00080004
0x08750140	?	?	None?
0x087600C0	?	?	None?
0x08770100	?	?	?
0x087800C0	?	?	?

Note: The question marks from Dummy1 to GetSpecialFileSize on the "available since system version" field are mainly there because I think that most of these are necessary for the main system to function, so theoretically that would mean that since the creation of the 3DS these were available, or since launch if that makes more sense. But because of the peculiar nature of some of the functions, they will remain question marks until they can be confirmed 100%.

When access rights are required for a command, at least one of the bits in the process access info specified in the above table for the command must be set. Error 0xD9004676 is returned when a process attempts to use a command which it doesn't have access rights for the command. The exheader access info field is all zero's for most applications. Note that the permissions listed in the above table is for system-version v2.x, therefore permission bit(s) added with newer FIRM may be missing from this.

Each session for fs:USER has separate permissions, initially these are set to all zero's for new fs:USER sessions. The permissions/etc for fs:USER sessions are initialized via FS:Initialize(loaded from the user process exheader).

File service

Command Header	Description
0x000100C6	Dummy1
0x040100C4	Control
0x08010100	OpenSubFile
0x080200C2	Read
0x08030102	Write
0x08040000	GetSize
0x08050080	SetSize
0x08060000	GetAttributes
0x08070040	SetAttributes
0x08080000	Close
0x08090000	Flush
0x080A0040	SetPriority
0x080B0000	GetPriority
0x080C0000	OpenLinkFile

Directory service

Command Header	Description
0x000100C6	Dummy1
0x040100C4	Control
0x08010042	Read
0x08020000	Close

Filesystem service "fs:LDR"

This service is identical to fs:USER, except FS:OpenArchive archive 0x2345678E can only be accessed with fs:LDR

ProgramRegistry service "fs:REG"

Command Header	Description
0x000100C6	Dummy1
0x040103C0	Register
0x04020040	Unregister
0x040300C0	GetProgramInfo
0x04040100	LoadProgram
0x04050080	UnloadProgram
0x04060080	CheckHostLoadId

Errors

See Filesystem_services_PXI.