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Created page with "== Overview == This page documents the format of the '''NCCH Extended Header''' (''exheader'' for short). The exheader, has two sections: * The actual exheader data, containing ..."
== Overview ==
This page documents the format of the '''NCCH Extended Header''' (''exheader'' for short).
The exheader, has two sections:
* The actual exheader data, containing System Control Info and Access Control Info,
* And a signed copy of NCCH HDR public key, and exheader Access Control Info. (This version of the Access Control Info is used as limitation to the actual Access Control Info)
== Main Structure ==
All values are little endian unless otherwise specified.
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x200
| System Control Info
|-
| 0x200
| 0x200
| Access Control Info
|-
| 0x400
| 0x100
| AccessDesc Signature (RSA-2048-SHA256)
|-
| 0x500
| 0x100
| NCCH Hdr RSA-2048 Public Key
|-
| 0x600
| 0x200
| Access Control Info (For limitation of first Access Control Info)
|}
The AccessDesc Signature covers the ''NCCH Hdr Public Key'' and second ''Access Control Info''. The AccessDesc public key is initialised by the bootrom.
== System Control Info ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| Application Title
|-
| 0x8
| 0x5
| Reserved
|-
| 0xD
| 0x1
| Flag (Bit0: CompressExefsCode, Bit1: SDApplication)
|-
| 0xE
| 0x2
| Remaster Version
|-
| 0x10
| 0xC
| Text Code Set Info
|-
| 0x1C
| 0x4
| Stack Size
|-
| 0x20
| 0xC
| ReadOnly Code Set Info
|-
| 0x2C
| 0x4
| Reserved
|-
| 0x30
| 0xC
| Data Code Set Info
|-
| 0x3C
| 0x4
| BSS Size
|-
| 0x40
| 0x180 (48*8)
| Dependency Module (Program ID) List
|-
| 0x1C0
| 0x40
| SystemInfo
|}
=== Code Set Info ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| Address
|-
| 0x4
| 0x4
| Max Number of Pages
|-
| 0x8
| 0x4
| Size
|}
=== System Info ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| SaveData Size
|-
| 0x8
| 0x8
| Jump ID
|-
| 0x10
| 0x30
| Reserved
|}
== Access Control Info ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x170
| ARM11 Local System Capabilities
|-
| 0x170
| 0x80
| ARM11 Kernel Capabilities
|-
| 0x1F0
| 0x10
| ARM9 Access Control
|}
=== ARM11 Local System Capabilities ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| Program ID
|-
| 0x8
| 0x4
| Core Version (The Unique ID of the required FIRM)
|-
| 0xC
| 0x2
| Reserved
|-
| 0xE
| 0x1
| Flag0
|-
| 0xF
| 0x1
| Priority
|-
| 0x10
| 0x20 (16*2)
| Resource Limit Descriptors
|-
| 0x30
| 0x20
| Storage Info
|-
| 0x50
| 0x100 (32*8)
| Service Access Control
|-
| 0x150
| 0x1F
| Reserved
|-
| 0x16F
| 0x1
| Resource Limit Category. (0 = APPLICATION, 1 = SYS_APPLET, 2 = LIB_APPLET, 3 = OTHER)
|}
==== Storage Info ====
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| Extdata ID
|-
| 0x8
| 0x8
| System Save Data Ids
|-
| 0x10
| 0x8
| Storage Accessable Unique Ids
|-
| 0x18
| 0x7
| File System Access Info
|-
| 0x1F
| 0x1
| Other Attributes
|}
File System Access Info:
{| class="wikitable" border="1"
|-
! Bit
! Description
|-
| 0
| Category System Application
|-
| 1
| Category Hardware Check
|-
| 2
| Category File System Tool
|-
| 3
| Debug
|-
| 4
| TWL Card Backup
|-
| 5
| TWL Nand Data
|-
| 6
| BOSS
|-
| 7
| [[SD Filesystem|sdmc:/]] (Read Only)
|-
| 8
| Core
|-
| 9
| [[Flash Filesystem|nand:/ro/]] (Read Only)
|-
| 10
| [[Flash Filesystem|nand:/rw/]]
|-
| 11
| [[Flash Filesystem|nand:/ro/]] (Write Access)
|-
| 12
| Category System Settings
|-
| 13
| Card Board
|-
| 14
| Export Import IVS
|-
| 15
| [[SD Filesystem|sdmc:/]] (Write Access)
|-
| 16
| Switch Cleanup (Introduced in [[3.0.0-5|3.0.0]]?)
|-
| 17
| Save Data Move (Introduced in [[5.0.0-11|5.0.0]])
|-
| 18
| Shop (Introduced in [[5.0.0-11|5.0.0]])
|-
| 19
| Shell (Introduced in [[5.0.0-11|5.0.0]])
|-
| 20
| Category HomeMenu (Introduced in [[6.0.0-11|6.0.0]])
|}
Other Attributes:
{| class="wikitable" border="1"
|-
! Bit
! Description
|-
| 0
| Not use RomFS
|-
| 1
| Use Extended Save Data Access. When this is set, the ''Extdata ID'' and ''Storage Accessable Unique Ids'' regions are used to store a total of 6 ''Accessible Save Ids''. Introduced in [[6.0.0-11|6.0.0]].
|}
=== ARM11 Kernel Capabilities ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x70 (28*4)
| Descriptors
|-
| 0x70
| 0x10
| Reserved
|}
=== ARM9 Access Control ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0xF
| Descriptors
|-
| 0xF
| 0x1
| ARM9 Descriptor Version
|}
Descriptors:
{| class="wikitable" border="1"
|-
! Bit
! Description
|-
| 0
| Mount [[Flash Filesystem|nand:/]]
|-
| 1
| Mount [[Flash Filesystem|nand:/ro/]] (Write Access)
|-
| 2
| Mount [[Flash Filesystem|twln:/]]
|-
| 3
| Mount [[Flash Filesystem|wnand:/]]
|-
| 4
| Mount Card SPI
|-
| 5
| Use SDIF3
|-
| 6
| Create Seed
|-
| 7
| Use Card SPI
|-
| 8
| SD Application (Not checked)
|-
| 9
| Mount [[SD Filesystem|sdmc:/]] (Write Access)
|}
This page documents the format of the '''NCCH Extended Header''' (''exheader'' for short).
The exheader, has two sections:
* The actual exheader data, containing System Control Info and Access Control Info,
* And a signed copy of NCCH HDR public key, and exheader Access Control Info. (This version of the Access Control Info is used as limitation to the actual Access Control Info)
== Main Structure ==
All values are little endian unless otherwise specified.
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x200
| System Control Info
|-
| 0x200
| 0x200
| Access Control Info
|-
| 0x400
| 0x100
| AccessDesc Signature (RSA-2048-SHA256)
|-
| 0x500
| 0x100
| NCCH Hdr RSA-2048 Public Key
|-
| 0x600
| 0x200
| Access Control Info (For limitation of first Access Control Info)
|}
The AccessDesc Signature covers the ''NCCH Hdr Public Key'' and second ''Access Control Info''. The AccessDesc public key is initialised by the bootrom.
== System Control Info ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| Application Title
|-
| 0x8
| 0x5
| Reserved
|-
| 0xD
| 0x1
| Flag (Bit0: CompressExefsCode, Bit1: SDApplication)
|-
| 0xE
| 0x2
| Remaster Version
|-
| 0x10
| 0xC
| Text Code Set Info
|-
| 0x1C
| 0x4
| Stack Size
|-
| 0x20
| 0xC
| ReadOnly Code Set Info
|-
| 0x2C
| 0x4
| Reserved
|-
| 0x30
| 0xC
| Data Code Set Info
|-
| 0x3C
| 0x4
| BSS Size
|-
| 0x40
| 0x180 (48*8)
| Dependency Module (Program ID) List
|-
| 0x1C0
| 0x40
| SystemInfo
|}
=== Code Set Info ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| Address
|-
| 0x4
| 0x4
| Max Number of Pages
|-
| 0x8
| 0x4
| Size
|}
=== System Info ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| SaveData Size
|-
| 0x8
| 0x8
| Jump ID
|-
| 0x10
| 0x30
| Reserved
|}
== Access Control Info ==
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x170
| ARM11 Local System Capabilities
|-
| 0x170
| 0x80
| ARM11 Kernel Capabilities
|-
| 0x1F0
| 0x10
| ARM9 Access Control
|}
=== ARM11 Local System Capabilities ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| Program ID
|-
| 0x8
| 0x4
| Core Version (The Unique ID of the required FIRM)
|-
| 0xC
| 0x2
| Reserved
|-
| 0xE
| 0x1
| Flag0
|-
| 0xF
| 0x1
| Priority
|-
| 0x10
| 0x20 (16*2)
| Resource Limit Descriptors
|-
| 0x30
| 0x20
| Storage Info
|-
| 0x50
| 0x100 (32*8)
| Service Access Control
|-
| 0x150
| 0x1F
| Reserved
|-
| 0x16F
| 0x1
| Resource Limit Category. (0 = APPLICATION, 1 = SYS_APPLET, 2 = LIB_APPLET, 3 = OTHER)
|}
==== Storage Info ====
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| Extdata ID
|-
| 0x8
| 0x8
| System Save Data Ids
|-
| 0x10
| 0x8
| Storage Accessable Unique Ids
|-
| 0x18
| 0x7
| File System Access Info
|-
| 0x1F
| 0x1
| Other Attributes
|}
File System Access Info:
{| class="wikitable" border="1"
|-
! Bit
! Description
|-
| 0
| Category System Application
|-
| 1
| Category Hardware Check
|-
| 2
| Category File System Tool
|-
| 3
| Debug
|-
| 4
| TWL Card Backup
|-
| 5
| TWL Nand Data
|-
| 6
| BOSS
|-
| 7
| [[SD Filesystem|sdmc:/]] (Read Only)
|-
| 8
| Core
|-
| 9
| [[Flash Filesystem|nand:/ro/]] (Read Only)
|-
| 10
| [[Flash Filesystem|nand:/rw/]]
|-
| 11
| [[Flash Filesystem|nand:/ro/]] (Write Access)
|-
| 12
| Category System Settings
|-
| 13
| Card Board
|-
| 14
| Export Import IVS
|-
| 15
| [[SD Filesystem|sdmc:/]] (Write Access)
|-
| 16
| Switch Cleanup (Introduced in [[3.0.0-5|3.0.0]]?)
|-
| 17
| Save Data Move (Introduced in [[5.0.0-11|5.0.0]])
|-
| 18
| Shop (Introduced in [[5.0.0-11|5.0.0]])
|-
| 19
| Shell (Introduced in [[5.0.0-11|5.0.0]])
|-
| 20
| Category HomeMenu (Introduced in [[6.0.0-11|6.0.0]])
|}
Other Attributes:
{| class="wikitable" border="1"
|-
! Bit
! Description
|-
| 0
| Not use RomFS
|-
| 1
| Use Extended Save Data Access. When this is set, the ''Extdata ID'' and ''Storage Accessable Unique Ids'' regions are used to store a total of 6 ''Accessible Save Ids''. Introduced in [[6.0.0-11|6.0.0]].
|}
=== ARM11 Kernel Capabilities ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x70 (28*4)
| Descriptors
|-
| 0x70
| 0x10
| Reserved
|}
=== ARM9 Access Control ===
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0xF
| Descriptors
|-
| 0xF
| 0x1
| ARM9 Descriptor Version
|}
Descriptors:
{| class="wikitable" border="1"
|-
! Bit
! Description
|-
| 0
| Mount [[Flash Filesystem|nand:/]]
|-
| 1
| Mount [[Flash Filesystem|nand:/ro/]] (Write Access)
|-
| 2
| Mount [[Flash Filesystem|twln:/]]
|-
| 3
| Mount [[Flash Filesystem|wnand:/]]
|-
| 4
| Mount Card SPI
|-
| 5
| Use SDIF3
|-
| 6
| Create Seed
|-
| 7
| Use Card SPI
|-
| 8
| SD Application (Not checked)
|-
| 9
| Mount [[SD Filesystem|sdmc:/]] (Write Access)
|}