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 | 0x1007 |
| 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 |
| 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 | ? | ? | ? |
| 0x087900C2 | ? | Same as GetLegacyBannerData, except for the last parameter this passes u8 value 0x1 instead of 0x0, for the FSPXI command. | 0x00101015 |
| 0x087A.... | 9.6.0-X | ? | 0x00200000 |
| 0x087B.... | 9.6.0-X | Wrapper for the code internally used for command <0x087A....>. | 0x00200000 |
| 0x087C.... | 9.6.0-X | Eventually calls same code as command <0x087A....>. | 0x00200000 |
| 0x087D0000 | 9.6.0-X | Writes an u32 from state to cmdreply[2]. Probably the total number of titles in the SEEDDB? | 0x00200000 |
| 0x087E0042 | 9.6.0-X | Eventually calls same code as command <0x087A....>. Writes a list of titleIDs to the outbuf, this is for titles with content-lock-seed(s) stored in SEEDDB. (u32 total_titleids_probably, ((Size<<4) | 12), outbufptr) | 0x00200000 |
| 0x087F.... | 9.6.0-X | ? | 0x00200000 |
| 0x0880.... | 9.6.0-X | Eventually calls same code as command <0x087A....>. | 0x00200000 |
| 0x0881.... | 9.6.0-X | Eventually calls same code as command <0x087A....>. | 0x00200000 |
| 0x0882.... | 9.6.0-X | Eventually calls same code as command <0x087A....>. | 0x00200000 |
| 0x08830000 | 9.6.0-X | Writes an output value to cmdreply[2]. | 0x00200000 |
| 0x0884.... | 9.6.0-X | Eventually calls same code as command <0x087A....>. | 0x00200000 |
| 0x0885.... | 9.6.0-X | ? | 0x00200000 |
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 |
| 0x0C010100 | ? |
Directory service
| Command Header | Available since system version | Description |
|---|---|---|
| 0x000100C6 | 1.0.0-0 | Dummy1 |
| 0x040100C4 | 1.0.0-0 | Control |
| 0x08010042 | 1.0.0-0 | Read |
| 0x08020000 | 1.0.0-0 | Close |
| 0x08030040 | ? | SetPriority |
| 0x08040000 | ? | GetPriority |
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 |
Only one session can be opened for this service at a time, hence no other processes can use this due to pm-module using this.
SEEDDB
With 9.6.0-X new System_SaveData with saveID 0001000F was added, this seems to be handled by FS-module itself, probably via the new service-cmds added to fsuser. Home Menu and NIM module have access to those commands.
The SEEDDB savedata contains the title-unique seed-data used for the new NCCH keyY generation added with FIRM 9.6.0-X.