View source for NPDM

This is the Switch equivalent of 3DS [https://www.3dbrew.org/wiki/NCCH/Extended_Header exheader]. This is the file with extension ".npdm" in {Switch ExeFS}. The size of this file varies.

{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x80
| [[#META|META]]
|-
| 0x80
| <Varies>
| [[#ACID|ACID]]
|-
| <See META>
| <See META>
| [[#ACI0|ACI0]]
|}

= META =
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| Magic ("META")
|-
| 0x4
| 0x4
| [9.0.0+] SignatureKeyGeneration
|-
| 0x8
| 0x4
| Reserved
|-
| 0xC
| 0x1
| [[#Flags|Flags]]
|-
| 0xD
| 0x1
| Reserved
|-
| 0xE
| 0x1
| [[#MainThreadPriority|MainThreadPriority]]
|-
| 0xF
| 0x1
| MainThreadCoreNumber
|-
| 0x10
| 0x4
| Reserved
|-
| 0x14
| 0x4
| [3.0.0+] [[#SystemResourceSize|SystemResourceSize]]
|-
| 0x18
| 0x4
| [[#Version|Version]]
|-
| 0x1C
| 0x4
| [[#MainThreadStackSize|MainThreadStackSize]]
|-
| 0x20
| 0x10
| Name (usually/always "Application")
|-
| 0x30
| 0x10
| ProductCode (usually/always all zeroes)
|-
| 0x40
| 0x30
| Reserved
|-
| 0x70
| 0x4
| [[#ACI0|AciOffset]]
|-
| 0x74
| 0x4
| [[#ACI0|AciSize]]
|-
| 0x78
| 0x4
| [[#ACID|AcidOffset]]
|-
| 0x7C
| 0x4
| [[#ACID|AcidSize]]
|}

== Flags ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 0
| Is64BitInstruction
|-
| 1-3
| ProcessAddressSpace (0x00 = AddressSpace32Bit, 0x01 = AddressSpace64BitOld, 0x02 = AddressSpace32BitNoReserved, 0x03 = AddressSpace64Bit)
|-
| 4
| [7.0.0+] OptimizeMemoryAllocation
|-
| 5
| [11.0.0+] DisableDeviceAddressSpaceMerge
|}

== MainThreadPriority ==
Ranges from 0 to 0x3F.

== SystemResourceSize ==
When this is non-zero, the kernel reserves this amount of memory and dynamically uses it as needed for page table pages, KMemoryBlocks, and KBlockInfos. When this is zero, the process uses global shared heaps for these.

This enables a process to sacrifice some of the memory available to it in order to have higher limits on these resources, thus enabling the use of SvcMapPhysicalMemory.

Maximum size as is 0x1FE00000.


== Version ==
0 for all titles.

[8.1.0+] Now set to 1 for certain titles.

[9.0.0+] Now set to a proper version field for all titles.

== MainThreadStackSize ==
Must be aligned to 0x1000. If zero, kernel will start the process's initial thread with sp=0.

= ACID =
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x100
| RSA-2048 signature over the data starting at 0x100 with the size field from 0x204
|-
| 0x100
| 0x100
| RSA-2048 public key for the second [[NCA_Format|NCA]] signature
|-
| 0x200
| 0x4
| Magic ("ACID")
|-
| 0x204
| 0x4
| Size
|-
| 0x208
| 0x1
| [9.0.0+] Version
|-
| 0x209
| 0x1
| [14.0.0+] 
|-
| 0x20A
| 0x2
| Reserved
|-
| 0x20C
| 0x4
| [[#Flags_2|Flags]]
|-
| 0x210
| 0x8
| ProgramIdMin
|-
| 0x218
| 0x8
| ProgramIdMax
|-
| 0x220
| 0x4
| [[#FsAccessControl|FacOffset]]
|-
| 0x224
| 0x4
| [[#FsAccessControl|FacSize]]
|-
| 0x228
| 0x4
| [[#SrvAccessControl|SacOffset]]
|-
| 0x22C
| 0x4
| [[#SrvAccessControl|SacSize]]
|-
| 0x230
| 0x4
| [[#KernelCapability|KcOffset]]
|-
| 0x234
| 0x4
| [[#KernelCapability|KcSize]]
|-
| 0x238
| 0x8
| Reserved
|}

== Flags ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 0
| ProductionFlag
|-
| 1
| UnqualifiedApproval
|-
| 2-5
| [5.0.0+] MemoryRegion (0 = Application, 1 = Applet, 2 = SecureSystem, 3 = NonSecureSystem)
|}

MemoryRegion is set to Application for "starter" and NonSecureSystem for "nvservices".

= ACI0 =
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| Magic ("ACI0")
|-
| 0x4
| 0xC
| Reserved
|-
| 0x10
| 0x8
| ProgramId
|-
| 0x18
| 0x8
| Reserved
|-
| 0x20
| 0x4
| [[#FsAccessControl|FacOffset]]
|-
| 0x24
| 0x4
| [[#FsAccessControl|FacSize]]
|-
| 0x28
| 0x4
| [[#SrvAccessControl|SacOffset]]
|-
| 0x2C
| 0x4
| [[#SrvAccessControl|SacSize]]
|-
| 0x30
| 0x4
| [[#KernelCapability|KcOffset]]
|-
| 0x34
| 0x4
| [[#KernelCapability|KcSize]]
|-
| 0x38
| 0x8
| Reserved
|}

= FsAccessControl =
For [[#ACID|ACID]] this is a simple descriptor as follows:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x1
| Version (always 1, must be non-zero)
|-
| 0x1
| 0x1
| [5.0.0+] ContentOwnerIdCount
|-
| 0x2
| 0x1
| [5.0.0+] SaveDataOwnerIdCount
|-
| 0x3
| 0x1
| Padding
|-
| 0x4
| 0x8
| [[#FsAccessFlag|FsAccessFlag]]
|-
| 0xC
| 0x8
| ContentOwnerIdMin
|-
| 0x14
| 0x8
| ContentOwnerIdMax
|-
| 0x1C
| 0x8
| SaveDataOwnerIdMin
|-
| 0x24
| 0x8
| SaveDataOwnerIdMax
|-
| 0x2C
| 0x8 * ContentOwnerIdCount
| [5.0.0+] ContentOwnerIds
|-
| Variable
| 0x8 * SaveDataOwnerIdCount
| [5.0.0+] SaveDataOwnerIds
|}

For [[#ACI0|ACI0]] this embeds data as follows:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x1
| Version (always 1, must be non-zero)
|-
| 0x1
| 0x3
| Padding
|-
| 0x4
| 0x8
| [[#FsAccessFlag|FsAccessFlag]]
|-
| 0xC
| 0x4
| ContentOwnerInfoOffset
|-
| 0x10
| 0x4
| ContentOwnerInfoSize
|-
| 0x14
| 0x4
| SaveDataOwnerInfoOffset
|-
| 0x18
| 0x4
| SaveDataOwnerInfoSize
|-
| 0x1C
| 0x4
| (Optional) ContentOwnerIdCount
|-
| 0x1C
| 0x8 * ContentOwnerIdCount
| ContentOwnerIds
|-
| Variable
| 0x4
| SaveDataOwnerIdCount
|-
| Variable
| 0x1 * SaveDataOwnerIdCount
| Accessibilities (1=Read, 2=Write, 3=ReadWrite)
|-
| Variable (padded to nearest 4 bytes)
| 0x8 * SaveDataOwnerIdCount
| SaveDataOwnerIds
|}

== FsAccessFlag ==
{| class="wikitable" border="1"
|-
! Bits
! Name
! Description
|-
| 0
| ApplicationInfo
| MountContent* is accessible when set.
|-
| 1
| BootModeControl
| 
|-
| 2
| Calibration
| 
|-
| 3
| SystemSaveData
| 
|-
| 4
| GameCard
| 
|-
| 5
| SaveDataBackUp
| 
|-
| 6
| SaveDataManagement
| 
|-
| 7
| BisAllRaw
| 
|-
| 8
| GameCardRaw
| 
|-
| 9
| GameCardPrivate
| 
|-
| 10
| SetTime
| 
|-
| 11
| ContentManager
| 
|-
| 12
| ImageManager
| 
|-
| 13
| CreateSaveData
| 
|-
| 14
| SystemSaveDataManagement
| 
|-
| 15
| BisFileSystem
| 
|-
| 16
| SystemUpdate
| 
|-
| 17
| SaveDataMeta
| 
|-
| 18
| DeviceSaveData
| 
|-
| 19
| SettingsControl
| 
|-
| 20
| SystemData
| 
|-
| 21
| SdCard
| 
|-
| 22
| Host
| 
|-
| 23
| FillBis
| 
|-
| 24
| CorruptSaveData
| 
|-
| 25
| SaveDataForDebug
| 
|-
| 26
| FormatSdCard
| 
|-
| 27
| GetRightsId
| 
|-
| 28
| RegisterExternalKey
| 
|-
| 29
| RegisterUpdatePartition
| 
|-
| 30
| SaveDataTransfer
| 
|-
| 31
| DeviceDetection
|
|-
| 32
| AccessFailureResolution
| 
|-
| 33
| SaveDataTransferVersion2
| 
|-
| 34
| RegisterProgramIndexMapInfo
| 
|-
| 35
| CreateOwnSaveData
| 
|-
| 36
| MoveCacheStorage
| 
|-
| 37
| DeviceTreeBlob
| 
|-
| 38
| NotifyErrorContextServiceReady
| 
|-
| 39-61
| Reserved
| 
|-
| 62
| Debug
| See [[SPL_services#GetConfig|here]].
|-
| 63
| FullPermission
| Enables access to everything: all [[Filesystem_services#Permissions|permission types]] which check a bitmask have this bit set.
|}

Controls the [[Filesystem_services#Permissions|filesystem permissions]].

Web-applets permissions:
* "LibAppletWeb" and "LibAppletOff" have same access control: bit0 and bit3 set, and bit62 set.
* Rest of the web-applets: Same as above except bit0 isn't set.

= Service Access Control =
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 0-2
| Size (length of the service-name without null-terminator minus 1)
|-
| 7
| IsServer (service is allowed to be registered)
|-
| Variable
| Name
|}

This is a list of [[Services_API|service]]-name strings which the title has access to.

The service name string starts after the first byte and supports the wildcard <code>*</code> character.

= KernelCapability =
{| class="wikitable" border="1"
|-
! Pattern of lower bits
! Lowest clear bitmask/bit
! Description
|-
| <code>0bxxxxxxxxxxxx0111</code>
| Bit3
| [[#ThreadInfo]]
|-
| <code>0bxxxxxxxxxxx01111</code>
| Bit4
| [[#EnableSystemCalls]]
|-
| <code>0bxxxxxxxxx0111111</code>
| Bit6
| [[#MemoryMap]]
|-
| <code>0bxxxxxxxx01111111</code>
| Bit7
| [[#IoMemoryMap]]
|-
| <code>0bxxxxx01111111111</code>
| Bit10
| [8.0.0+] [[#MemoryRegionMap]]
|-
| <code>0bxxxx011111111111</code>
| Bit11
| [[#EnableInterrupts]]
|-
| <code>0bxx01111111111111</code>
| Bit13
| [[#MiscParams]]
|-
| <code>0bx011111111111111</code>
| Bit14
| [[#KernelVersion]]
|-
| <code>0b0111111111111111</code>
| Bit15
| [[#HandleTableSize]]
|-
| <code>0b1111111111111111</code>
| Bit16
| [[#MiscFlags]]
|-
| All ones
| 
| Invalid
|}

These descriptors are identified by pattern 01..11 in low bits.

== ThreadInfo ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 4-9
| LowestPriority
|-
| 10-15
| HighestPriority
|-
| 16-23
| MinCoreNumber
|-
| 24-31
| MaxCoreNumber
|}

== EnableSystemCalls ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 5-28
| SystemCallId
|-
| 29-31
| Index
|}

== MemoryMap ==
MemoryMap entries are stored in pairs. The first pair will contain BeginAddress and PermissionType, while the second pair will contain Size and MappingType.
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 7-30
| BeginAddress
|-
| 31
| PermissionType (0=RW, 1=RO)
|}

{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 7-26
| Size
|-
| 27-30
| Reserved
|-
| 31
| MappingType (0=Io, 1=Static)
|}

=== Restrictions ===
The physaddr range 0x80060000-0x2000000000 is not allowed to be mapped as IO.
The physaddr range 0x80000000-0x2000000000 is not allowed to be mapped as Normal.

[2.0.0-4.1.0] The range for IO was changed into 0x80060000-0x81D3FFFF.

[2.0.0-4.1.0] A blacklist was added for IO and Normal mappings:
* 0x50040000-0x50060000 (ARM, Interrupt Controller)
* 0x6000F000 (Exception Vectors)
* 0x6001DC00-0x6001E000 (IPATCH)
* 0x7000E000 (RTC/PMC)
* 0x70019000 (MC)
* 0x7001C000 (MC0)
* 0x7001D000 (MC1)

[5.0.0+] For IO, this blacklist was abandoned and instead two range checks were added. For Normal mappings it is still applied

== IoMemoryMap ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 8-31
| BeginAddress
|}

== MemoryRegionMap ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 11-16
| RegionType0 (0 = NoMapping, 1 = KernelTraceBuffer, 2 = OnMemoryBootImage, 3 = DTB)
|-
| 17
| RegionIsReadOnly0
|-
| 18-23
| RegionType1 (0 = NoMapping, 1 = KernelTraceBuffer, 2 = OnMemoryBootImage, 3 = DTB)
|-
| 24
| RegionIsReadOnly1
|-
| 25-30
| RegionType2 (0 = NoMapping, 1 = KernelTraceBuffer, 2 = OnMemoryBootImage, 3 = DTB)
|-
| 31
| RegionIsReadOnly2
|}

== EnableInterrupts ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 12-21
| InterruptNumber0
|-
| 22-31
| InterruptNumber1
|}

0x3FF means empty.

== MiscParams ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 14-16
| ProgramType (0 = System, 1 = Application, 2 = Applet)
|}

ProgramType is parsed by [[Process Manager services]]. Defaults to 0 if descriptor doesn't exist. Can only run 1 application at a time.

== KernelVersion ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 15-18
| MinorVersion
|-
| 19-31
| MajorVersion
|}

This encodes the intended kernel version for the program.

The kernel requires that the intended version is >= the minimum supported version (3.0 for all released kernels), and <= the current version.

Kernel version is derived from/equivalent to SDK version:
* Kernel Major = SDK Major + 4
* Kernel Minor = SDK Minor

=== Versions ===
{| class="wikitable" border="1"
|-
! Firmware || Kernel Version || Corresponding SDK Version
|-
| 1.0.0 || 5.0 || 1.0.0.0
|-
| 2.0.0 || 6.1 || 2.1.0.0
|-
| 3.0.0 || 7.4 || 3.4.0.0
|-
| 3.0.2 || 7.4 || 3.4.0.0
|-
| 5.0.0 || 9.3 || 5.3.0.0
|-
| 10.0.0 || 14.4 || 10.4.0.0
|-
| 11.0.0 || 15.4 || 11.4.0.0
|-
| 11.0.1 || 15.4 || 11.4.0.0
|}

== HandleTableSize ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 16-25
| HandleTableSize
|}

== MiscFlags ==
{| class="wikitable" border="1"
|-
! Bits
! Description
|-
| 17
| EnableDebug
|-
| 18
| ForceDebug
|}