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== Overview ==
This page documents the format of the '''NCCH Extended Header''', or '''exheader''' for short.
This page documents the format of the '''NCCH Extended Header''' (''exheader'' for short).


The exheader, has two sections:
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)
* The actual exheader data, containing System Control Info (SCI) and Access Control Info (ACI);
* A signed copy of NCCH HDR public key, and exheader ACI. This version of the ACI is used as limitation to the actual ACI.


== Main Structure ==
== Main Structure ==
All values are little endian unless otherwise specified.
All values are little endian unless otherwise specified.
See also: [https://github.com/3DSGuy/Project_CTR/blob/20f708450b9c6e7f64eafa6c2a8eeb25a630c69a/ctrtool/exheader.h]


{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0x200
| <code>0x200</code>
| System Control Info
| SCI
|-
|-
| 0x200
| <code>0x200</code>
| 0x200
| <code>0x200</code>
| Access Control Info
| ACI
|-
|-
| 0x400
| <code>0x400</code>
| 0x100
| <code>0x100</code>
| AccessDesc Signature (RSA-2048-SHA256)
| <code>AccessDesc</code> signature (RSA-2048-SHA256)
|-
|-
| 0x500
| <code>0x500</code>
| 0x100
| <code>0x100</code>
| NCCH Hdr RSA-2048 Public Key
| NCCH header RSA-2048 modulus
|-
|-
| 0x600
| <code>0x600</code>
| 0x200
| <code>0x200</code>
| Access Control Info (For limitation of first Access Control Info)
| ACI (for limitation of first ACI)
|}
|}


The AccessDesc Signature covers the ''NCCH Hdr Public Key'' and second ''Access Control Info''. The AccessDesc public key is initialised by the bootrom.
The <code>AccessDesc</code> signature covers the NCCH header modulus and second ACI. The <code>AccessDesc</code> public key is initialised by the boot ROM.


When loading the exheader, [[FIRM|Process9]] compares the exheader data with the data in the accessdesc(note that not everything is compared here). When these don't match, an error is returned. The Process9 code handling this validation was updated with [[6.0.0-11|v6.0]](the only change in this function seems to be the check for the "Ideal Processor" field).
When loading the exheader, [[FIRM|Process9]] compares the exheader data with the data in the <code>AccessDesc</code> (note that not everything is compared here). When these don't match, an error is returned. The Process9 code handling this validation was updated with [[6.0.0-11|v6.0]]; the only change in this function seems to be the check for the "Ideal processor" field.


== System Control Info ==
== System Control Info ==
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0x8
| <code>0x8</code>
| Application Title
| Application title (default is "CtrApp")
|-
|-
| 0x8
| <code>0x8</code>
| 0x5
| <code>0x5</code>
| Reserved
| Reserved
|-
|-
| 0xD
| <code>0xD</code>
| 0x1
| <code>0x1</code>
| Flag (Bit0: CompressExefsCode, Bit1: SDApplication)
| Flag (bit 0: <code>CompressExefsCode</code>, bit 1: <code>SDApplication</code>)
|-
|-
| 0xE
| <code>0xE</code>
| 0x2
| <code>0x2</code>
| Remaster Version
| Remaster version
|-
|-
| 0x10
| <code>0x10</code>
| 0xC
| <code>0xC</code>
| Text Code Set Info
| Text code set info
|-
|-
| 0x1C
| <code>0x1C</code>
| 0x4
| <code>0x4</code>
| Stack Size
| Stack size
|-
|-
| 0x20
| <code>0x20</code>
| 0xC
| <code>0xC</code>
| ReadOnly Code Set Info
| Read-only code set info
|-
|-
| 0x2C
| <code>0x2C</code>
| 0x4
| <code>0x4</code>
| Reserved
| Reserved
|-
|-
| 0x30
| <code>0x30</code>
| 0xC
| <code>0xC</code>
| Data Code Set Info
| Data code set info
|-
|-
| 0x3C
| <code>0x3C</code>
| 0x4
| <code>0x4</code>
| BSS Size
| BSS size
|-
|-
| 0x40
| <code>0x40</code>
| 0x180 (48*8)
| <code>0x180</code> (<code>48*8</code>)
| Dependency Module (Program ID) List
| Dependency [[Title list#00040130 - System Modules|module]] (program ID) list
|-
|-
| 0x1C0
| <code>0x1C0</code>
| 0x40
| <code>0x40</code>
| SystemInfo
| <code>SystemInfo</code>
|}
|}
Most of these fields are used in [[LOADER:LoadProcess]].


=== Code Set Info ===
=== Code Set Info ===
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0x4
| <code>4</code>
| Address
| Address
|-
|-
| 0x4
| <code>0x4</code>
| 0x4
| <code>4</code>
| Physical region size (in page-multiples)
| Physical region size (in page-multiples)
|-
|-
| 0x8
| <code>0x8</code>
| 0x4
| <code>4</code>
| Size (in bytes)
| Size (in bytes)
|}
|}


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{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0x8
| <code>0x8</code>
| SaveData Size
| <code>SaveData</code> Size
|-
|-
| 0x8
| <code>0x8</code>
| 0x8
| <code>0x8</code>
| Jump ID
| Jump ID
|-
|-
| 0x10
| <code>0x10</code>
| 0x30
| <code>0x30</code>
| Reserved
| Reserved
|}
|}


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{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0x170
| <code>0x170</code>
| ARM11 Local System Capabilities
| [[#ARM11 Local System Capabilities|ARM11 local system capabilities]]
|-
|-
| 0x170
| <code>0x170</code>
| 0x80
| <code>0x80</code>
| ARM11 Kernel Capabilities
| [[#ARM11 Kernel Capabilities|ARM11 kernel capabilities]]
|-
|-
| 0x1F0
| <code>0x1F0</code>
| 0x10
| <code>0x10</code>
| ARM9 Access Control
| [[#ARM9 Access Control|ARM9 access control]]
|}
|}


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{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0x8
| <code>0x8</code>
| Program ID
| Program ID
|-
|-
| 0x8
| <code>0x8</code>
| 0x4
| <code>0x4</code>
| Core Version (The Title ID low of the required [[FIRM]])
| Core version (The Title ID low of the required [[FIRM]])
|-
|-
| 0xC
| <code>0xC</code>
| 0x2
| <code>0x2</code>
| Flag1 and Flag2
| [[#Flag1|Flag1]] and [[#Flag2|Flag2]] (both implemented starting from [[8.0.0-18]]).
|-
|-
| 0xE
| <code>0xE</code>
| 0x1
| <code>0x1</code>
| Flag0
| [[#Flag0|Flag0]]
|-
|-
| 0xF
| <code>0xF</code>
| 0x1
| <code>0x1</code>
| Priority
| Priority
|-
|-
| 0x10
| <code>0x10</code>
| 0x20 (16*2)
| <code>0x20</code> (<code>16*2</code>)
| Resource Limit Descriptors
| Resource limit descriptors. The first byte here controls the maximum allowed [[PMApp:SetAppResourceLimit|<code>CpuTime</code>]].
|-
|-
| 0x30
| <code>0x30</code>
| 0x20
| <code>0x20</code>
| Storage Info
| [[#Storage Info|Storage info]]
|-
|-
| 0x50
| <code>0x50</code>
| 0x100 (32*8)
| <code>0x100</code> (<code>32*8</code>)
| Service Access Control
| [[#Service Access Control|Service access control]]
|-
|-
| 0x150
| <code>0x150</code>
| 0x10 (2*8)
| <code>0x10</code> (<code>2*8</code>)
| Extended Service Access Control, support for this was implemented with [[9.3.0-21|9.3.0-X]].
| Extended service access control, support for this was implemented with [[9.3.0-21|9.3.0-X]].
|-
|-
| 0x160
| <code>0x160</code>
| 0xF
| <code>0xF</code>
| Reserved
| Reserved
|-
|-
| 0x16F
| <code>0x16F</code>
| 0x1
| <code>0x1</code>
| Resource Limit Category. (0 = APPLICATION, 1 = SYS_APPLET, 2 = LIB_APPLET, 3 = OTHER)
| Resource limit category. (0 = <code>APPLICATION</code>, 1 = <code>SYS_APPLET</code>, 2 = <code>LIB_APPLET</code>, 3 = <code>OTHER</code> (sysmodules running under the BASE memregion))
|}
|}


==== Flag0 ====
==== Flag0 ====
This stores the ''System Mode'', ''Affinity Mask'' and ''Ideal Processor'' values in one byte. They are stored as follows:
{| class="wikitable" border="1"
u8 Flag0 = (SystemMode << 4 | AffinityMask << 2 | IdealProcessor);
|-
And can be retrieved as follows:
! Bits
u8 SystemMode = (Flag0>>4)&0xF;
! Description
u8 AffinityMask = (Flag0>>2)&0x3;
|-
u8 IdealProcessor = (Flag0>>0)&0x3;
| <code>0-1</code>
| Ideal processor
|-
| <code>2-3</code>
| Affinity mask
|-
| <code>4-7</code>
| Old3DS system mode
|}


In the exheader data, the IdealProcessor field is a bit-index, while in the accessdesc the IdealProcessor field is a bitmask. When the bit specified by the exheader field is not set in the accessdesc field, an error is returned. "if((1<<exheaderval) & accessdescval == 0)return error"
===== Old3DS System Mode =====
{| class="wikitable" border="1"
|-
! Value
! Description
|-
| <code>0</code>
| <code>Prod</code> (64MB of usable application memory)
|-
| <code>1</code>
| <code>Undefined</code> (unusable)
|-
| <code>2</code>
| <code>Dev1</code> (96MB of usable application memory)
|-
| <code>3</code>
| <code>Dev2</code> (80MB of usable application memory)
|-
| <code>4</code>
| <code>Dev3</code> (72MB of usable application memory)
|-
| <code>5</code>
| <code>Dev4</code> (32MB of usable application memory)
|-
| <code>6-7</code>
| <code>Undefined</code> Same as <code>Prod</code>?
|}
 
In the exheader data, the ideal processor field is a bit-index, while in the <code>AccessDesc</code> the ideal processor field is a bitmask. When the bit specified by the exheader field is not set in the <code>AccessDesc</code> field, an error is returned.


During a FIRM-launch when a titleinfo structure was specified, the field at offset [[FIRM#FIRM_Launch_Parameters|0x400]] in the FIRM-launch parameters is set to the SystemMode of the specified title(however in some cases other values are written there). With [[8.0.0-18]] NS will now check the output of [[PTM|PTMSYSM]] command 0x040A0000, when the output is non-zero and a certain NS state field is value-zero, the following is executed otherwise this is skipped. With that check passed on [[8.0.0-18]], NS will then check (Flag2 & 0xf). When that's value2, the output value(used for the FIRM-launcher parameter field mentioned above) is set to value7. Otherwise, when that value is non-zero, the output value is set to 6.
<pre>if((1 << exheaderval) & accessdescval == 0) return error</pre>


==== Flag1 and Flag2 ====
During a FIRM-launch when a <code>TitleInfo</code> structure was specified, the field at offset [[FIRM#FIRM_Launch_Parameters|0x400]] in the FIRM-launch parameters is set to the SystemMode of the specified title, however in some cases other values are written there. With [[8.0.0-18]] NS will now check the output of [[PTM|PTMSYSM]] command <code>0x040A0000</code>, when the output is non-zero and a certain NS state field is value-zero, the following is executed otherwise this is skipped. With that check passed on [[8.0.0-18]], NS will then check (<code>Flag2 & 0xF</code>). When that is <code>value2</code>, the output value (used for the FIRM-launcher parameter field mentioned above) is set to <code>value7</code>. Otherwise, when that value is non-zero, the output value is set to 6.
Support for these two u8 fields were implemented with [[8.0.0-18]].


===== Flag1 =====
==== Flag1 ====
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Bit
! Bits
! Description
! Description
|-
|-
| 0
| <code>0</code>
| Unknown.
| <code>EnableL2Cache</code> (Unknown what this actually does, New3DS-only presumably)
|-
|-
| 1
| <code>1</code>
| Unknown.
| <code>cpuspeed_804MHz</code> (Default "cpuspeed" when not set)
|-
|-
| 2-7
| <code>2-7</code>
| Unused
| Unused
|}
|}


In order for the exheader to have any of the above new bits set, the accessdesc must have the corresponding bit set, otherwise the invalid-exheader error is returned.
In order for the exheader to have any of the above new bits set, the <code>AccessDesc</code> must have the corresponding bit set, otherwise the invalid-exheader error is returned.
 
Homebrew which runs under a title which has the above <code>cpuspeed</code> flag set, runs much faster on New3DS. It's unknown how exactly the system handles these flags.
 
When launching titles / perhaps other things with [[APT]], [[NS]] uses [[PTMSYSM:ConfigureNew3DSCPU]] with data which originally came from these flags; NS does this regardless of what the running 3DS system is. However, due to a bug(?) in NS the value sent to that command is always either 0x0 or 0x3. When calculating that value, the code only ever uses the cpuspeed field, not the cache field: code to actually load and check the value of the cache field appears to be missing.


===== Flag2 =====
==== Flag2 ====
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Bit
! Bit
! Description
! Description
|-
|-
| 0-3
| <code>0-3</code>
| ?
| New3DS system mode
|-
|-
| 4-7
| <code>4-7</code>
| Unused
| Unused
|}
|}


The exheader value for the above 4-bit value must be <= to the accessdesc value, otherwise the invalid-exheader error is returned.
===== New3DS System Mode =====
{| class="wikitable" border="1"
|-
! Value
! Description
|-
| <code>0</code>
| <code>Legacy</code> (use Old3DS system mode)
|-
| <code>1</code>
| <code>Prod</code> (124MB of usable application memory)
|-
| <code>2</code>
| <code>Dev1</code> (178MB of usable application memory)
|-
| <code>3</code>
| <code>Dev2</code> (124MB of usable application memory)
|-
| <code>4-7</code>
| <code>Undefined</code> Same as <code>Prod</code>?
|}
 
When in <code>Legacy</code> mode, the actual memory layout is the same as in <code>New3DS Prod</code>, except the available application memory as reported to the application is reduced to the Old3DS size.
 
The exheader value for the New3DS system mode value must be ≤ to the <code>AccessDesc</code> value, otherwise the invalid-exheader error is returned.


==== Storage Info ====
==== Storage Info ====
Used in [[FSReg:Register]].
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0x8
| <code>8</code>
| Extdata ID
| Extdata ID
|-
|-
| 0x8
| <code>0x8</code>
| 0x8
| <code>8</code>
| System Save Data Ids
| System savedata IDs
|-
|-
| 0x10
| <code>0x10</code>
| 0x8
| <code>8</code>
| Storage Accessable Unique Ids
| Storage accessible unique IDs
|-
|-
| 0x18
| <code>0x18</code>
| 0x7
| <code>7</code>
| File System Access Info
| Filesystem access info
|-
|-
| 0x1F
| <code>0x1F</code>
| 0x1
| <code>1</code>
| Other Attributes
| Other attributes
|}
|}


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{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Bit and bitmask
! Bit and bitmask
! Description
! Description
|-
|-
| 0, 0x1
| <code>0</code>, <code>0x1</code>
| Category System Application
| Category system application
|-
|-
| 1, 0x2
| <code>1</code>, <code>0x2</code>
| Category Hardware Check
| Category hardware check
|-
|-
| 2, 0x4
| <code>2</code>, <code>0x4</code>
| Category File System Tool
| Category filesystem tool
|-
|-
| 3, 0x8
| <code>3</code>, <code>0x8</code>
| Debug
| Debug
|-
|-
| 4, 0x10
| <code>4</code>, <code>0x10</code>
| TWL Card Backup
| TWL card backup
|-
|-
| 5, 0x20
| <code>5</code>, <code>0x20</code>
| TWL Nand Data
| TWL NAND data
|-
|-
| 6, 0x40
| <code>6</code>, <code>0x40</code>
| BOSS
| BOSS
|-
|-
| 7, 0x80
| <code>7</code>, <code>0x80</code>
| [[FS:OpenArchive|sdmc:/]]
| [[FS:OpenArchive|<code>sdmc:/</code>]]
|-
|-
| 8, 0x100
| <code>8</code>, <code>0x100</code>
| Core
| Core
|-
|-
| 9, 0x200
| <code>9</code>, <code>0x200</code>
| [[Flash Filesystem|nand:/ro/]] (Read Only)
| [[Flash Filesystem|<code>nand:/ro/</code>]] (Read Only)
|-
|-
| 10, 0x400
| <code>10</code>, <code>0x400</code>
| [[Flash Filesystem|nand:/rw/]]
| [[Flash Filesystem|<code>nand:/rw/</code>]]
|-
|-
| 11, 0x800
| <code>11</code>, <code>0x800</code>
| [[Flash Filesystem|nand:/ro/]] (Write Access)
| [[Flash Filesystem|<code>nand:/ro/</code>]] (Write Access)
|-
|-
| 12, 0x1000
| <code>12</code>, <code>0x1000</code>
| Category System Settings
| Category system settings
|-
|-
| 13, 0x2000
| <code>13</code>, <code>0x2000</code>
| Card Board
| Cardboard
|-
|-
| 14, 0x4000
| <code>14</code>, <code>0x4000</code>
| Export Import IVS
| Export/Import IVS
|-
|-
| 15, 0x8000
| <code>15</code>, <code>0x8000</code>
| [[FS:OpenArchive|sdmc:/]] (Write-only)
| [[FS:OpenArchive|<code>sdmc:/</code>]] (Write-only)
|-
|-
| 16, 0x10000
| <code>16</code>, <code>0x10000</code>
| Switch Cleanup (Introduced in [[3.0.0-5|3.0.0]]?)  
| Switch cleanup (Introduced in [[3.0.0-5|3.0.0]]?)  
|-
|-
| 17, 0x20000
| <code>17</code>, <code>0x20000</code>
| Save Data Move (Introduced in [[5.0.0-11|5.0.0]])  
| Savedata move (Introduced in [[5.0.0-11|5.0.0]])  
|-
|-
| 18, 0x40000
| <code>18</code>, <code>0x40000</code>
| Shop (Introduced in [[5.0.0-11|5.0.0]])  
| Shop (Introduced in [[5.0.0-11|5.0.0]])  
|-
|-
| 19, 0x80000
| <code>19</code>, <code>0x80000</code>
| Shell (Introduced in [[5.0.0-11|5.0.0]])  
| Shell (Introduced in [[5.0.0-11|5.0.0]])  
|-
|-
| 20, 0x100000
| <code>20</code>, <code>0x100000</code>
| Category HomeMenu (Introduced in [[6.0.0-11|6.0.0]])  
| Category home menu (Introduced in [[6.0.0-11|6.0.0]])
|-
| <code>21</code>, <code>0x200000</code>
| Seed DB. Introduced in [[9.6.0-24|9.6.0-X]] [[FIRM]]. [[Home Menu]] has this bit set starting with [[9.6.0-24|9.6.0-X]].
|}
|}


Other Attributes:
====Other Attributes====
 
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Bit
! Bit
! Description
! Description
|-
|-
| 0
| <code>0</code>
| Not use RomFS
| Not use ROMFS
|-
|-
| 1
| <code>1</code>
| 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]].
| Use Extended savedata access.
|}
|}
When Bit1 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]].


==== Service Access Control ====
==== Service Access Control ====
This is the list of [[Services_API|services]] which the process is allowed to access, this is registered with the [[Services|services]] manager. Each service listed in the exheader must be listed in the accessdesc, otherwise the invalid exheader error is returned. The order of the services for exheader/accessdesc doesn't matter. The accessdesc can list services which are not in the exheader, but normally the service-access-control data for exheader/accessdesc are exactly the same.
This is the list of [[Services_API|services]] which the process is allowed to access, this is registered with the [[Services|services]] manager. Each service listed in the exheader must be listed in the <code>AccessDesc</code>, otherwise the invalid exheader error is returned. The order of the services for exheader/<code>AccessDesc</code> doesn't matter. The <code>AccessDesc</code> can list services which are not in the exheader, but normally the service-access-control data for exheader/<code>AccessDesc</code> are exactly the same.
 
This list is submitted to [[SRVPM:RegisterProcess]].


=== ARM11 Kernel Capabilities ===
=== ARM11 Kernel Capabilities ===
The kernel capability descriptors are passed to [[SVC|svcCreateProcess]].
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| <code>0x0</code>
| <code>0x70</code> (<code>28*4</code>)
| Descriptors
|-
| <code>0x70</code>
| <code>0x10</code>
| Reserved
|}
There are different descriptor types, determined by the number of leading ones in the binary value representation of bits 20-31. The different types are laid out as follows:
{| class="wikitable" border="1"
|-
! Pattern of bits 20-31
! Type
! Fields
|-
| <code>0b1110xxxxxxxx</code>
| Interrupt info
|
|-
| <code>0b11110xxxxxxx</code>
| System call mask
| Bits 24-26: System call mask table index; Bits 0-23: mask
|-
| <code>0b1111110xxxxx</code>
| Kernel release version
| Bits 8-15: Major version; Bits 0-7: Minor version
|-
| <code>0b11111110xxxx</code>
| Handle table size
| Bits 0-18: size
|-
| <code>0b111111110xxx</code>
| [[#ARM11_Kernel_Flags|Kernel flags]]
| See below
|-
| <code>0b11111111100x</code>
| Map IO/static address range
| Describes a memory mapping like the 0b111111111110 descriptor, but an entire range rather than a single page is mapped. Another 0b11111111100x descriptor must follow this one to denote the (exclusive) end of the address range to map. Bit20 on the first descriptor: map read-only (otherwise RW), bit20 on the second descriptor: map static (cacheable, otherwise IO if the bit is not set) 
|-
| <code>0b111111111110</code>
| Map IO memory page
| Bits 0-19: page index to map (virtual address >> 12; the physical address is determined per-page according to [[Memory layout]]); Bit 20: Map read-only (otherwise read-write)
|}
==== ARM11 Kernel Flags ====
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Bit
! Size
! Description
!  Description
|-
| <code>0</code>
| Allow debug
|-
| <code>1</code>
| Force debug
|-
| <code>2</code>
| Allow non-alphanum
|-
| <code>3</code>
| Shared page writing
|-
| <code>4</code>
| Privilege priority
|-
| <code>5</code>
| Allow <code>main()</code> args
|-
| <code>6</code>
| Shared device memory
|-
| <code>7</code>
| Runnable on sleep
|-
| <code>8-11</code>
| Memory type (1: application, 2: system, 3: base)
|-
|-
| 0x0
| <code>12</code>
| 0x70 (28*4)
| [[Memory_layout#NATIVE_FIRM.2FSAFE_MODE_FIRM_Userland_Memory|Special memory]]
| Descriptors
|-
|-
| 0x70
| <code>13</code>
| 0x10
| Process has access to CPU core 2 (New3DS only)
|  Reserved
|}
|}


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{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Offset
! Offset
! Size
! Size
! Description
! Description
|-
|-
| 0x0
| <code>0x0</code>
| 0xF
| <code>15</code>
| Descriptors
| Descriptors
|-
|-
| 0xF
| <code>0xF</code>
| 0x1
| <code>1</code>
| ARM9 Descriptor Version
| ARM9 Descriptor Version. Originally this value had to be ≥ 2. Starting with [[9.3.0-21|9.3.0-X]] this value has to be either value 2 or value 3.
|}
|}


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{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! Bit
! Bit
! Description
! Description
|-
|-
| 0
| <code>0</code>
| Mount [[Flash Filesystem|nand:/]]
| Mount [[Flash Filesystem|<code>nand:/</code>]]
|-
|-
| 1
| <code>1</code>
| Mount [[Flash Filesystem|nand:/ro/]] (Write Access)
| Mount [[Flash Filesystem|<code>nand:/ro/</code>]] (Write Access)
|-
|-
| 2
| <code>2</code>
| Mount [[Flash Filesystem|twln:/]]
| Mount [[Flash Filesystem|<code>twln:/</code>]]
|-
|-
| 3
| <code>3</code>
| Mount [[Flash Filesystem|wnand:/]]
| Mount [[Flash Filesystem|<code>wnand:/</code>]]
|-
|-
| 4
| <code>4</code>
| Mount Card SPI
| Mount card SPI
|-
|-
| 5
| <code>5</code>
| Use SDIF3
| Use SDIF3
|-
|-
| 6
| <code>6</code>
| Create Seed
| Create seed
|-
|-
| 7
| <code>7</code>
| Use Card SPI
| Use card SPI
|-
|-
| 8
| <code>8</code>
| SD Application (Not checked)
| SD application (Not checked)
|-
|-
| 9
| <code>9</code>
| Mount [[SD Filesystem|sdmc:/]] (Write Access)
| Mount [[SD Filesystem|sdmc:/]] (Write Access)
|}
|}
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