NPDM: Difference between revisions

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Access descriptors...this is basically 3ds, but with type at bottom instead of top
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Line 12: Line 12:
|-
|-
| 0x80
| 0x80
| 0x200
| RSA-2048 signature, followed a RSA-2048 modulus for [[NCA]] header (like 3DS)
|-
| 0x280
| <Varies>
| <Varies>
| ACID
| ACID
Line 24: Line 20:
|}
|}


=META=
= META =
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
Line 33: Line 29:
| 0x0
| 0x0
| 0x4
| 0x4
| Magicnum "META".
| Magic "META".
|-
|-
| 0x20
| 0x20
| ?
| ?
| Name string
| Title name
|-
|-
| 0x70
| 0x70
Line 58: Line 54:
Switch version of 3DS "System Control Info"?
Switch version of 3DS "System Control Info"?


=ACID=
= ACID =
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
Line 65: Line 61:
! Description
! Description
|-
|-
| 0x0
| 0
| 0x4
| 0x100
| Magicnum "ACID".
| RSA-2048 signature
|-
|-
| 0x4
| 0x100
| 0x28
| 0x100
| ?
| RSA-2048 public key
|-
|-
| 0x2C
| 0x200
| 0x4
| 0x4
| Size of the Service Access Control.
| Magic "ACID".
|-
|-
| 0x30
| 0x204
| 0x14
| 0x8
| ?
| Zeroes
|-
|-
| 0x44
| 0x20C
| ?
| 0x4
| FS Permissions
| Format version? (1)
|-
|-
| 0xF0
| 0x210
| <See above>
| 0x8
| Service Access Control
| Title id
|}
 
Switch version of AccessDesc?
 
=ACI0=
{| class="wikitable" border="1"
|-
|-
! Offset
| 0x218
! Size
| 0x8
! Description
| Title id again
|-
|-
| 0x0
| 0x220
| 0x4
| 0x4
| Magicnum "ACI0".
| FS Access Control offset
|-
|-
| 0x24
| 0x4
| 0x4
| FS Access Control size
|-
| 0x28
| 0x28
| ?
| 0x4
| Service Access Control offset
|-
|-
| 0x2C
| 0x2C
| 0x4
| 0x4
| Size of the Service Access Control.
| Service Access Control size
|-
|-
| 0x30
| 0x30
| 0x14
| 4
| ?
| Kernel Access Control offset
|-
|-
| 0x44
| 0x34
| ?
| 4
| FS Permissions
| Kernel Access Control size
|-
|-
| 0x60
| 0x38
| <See above>
| 0x8
| Service Access Control
| Padding
|}
|}


= ACI0 =
Looks like an old crappy version of ACID. It has the guessed version field 0 instead of 1.


Switch version of 3DS ACI(Access Control Info)?
= Service Access Control =
 
=Service Access Control=
This is a list of [[Services_API|service]]-name strings which the title has access to, with the following structure:
This is a list of [[Services_API|service]]-name strings which the title has access to, with the following structure:
   +0: control_byte
   +0: control_byte
Line 138: Line 132:
The service string can contain a wildcard <code>*</code> character.
The service string can contain a wildcard <code>*</code> character.


=Access Descriptors=
= Access Descriptors =
Like the 3DS, the switch has a number of kernel capability descriptors. Unlike 3ds, where descriptors were identified by pattern 11..10 in high bits, on switch descriptors are identified by pattern 01..11 in low bits.
Like the 3DS, the switch has a number of kernel capability descriptors. Unlike 3ds, where descriptors were identified by pattern 11..10 in high bits, on switch descriptors are identified by pattern 01..11 in low bits.


Revision as of 00:07, 29 June 2017

This is the Switch equivalent of 3DS exheader. This is the file with extension ".npdm" in {Switch ExeFS}. The size of this file varies.

Offset Size Description
0x0 0x80 META
0x80 <Varies> ACID
<See META> <See META> ACI0

META

Offset Size Description
0x0 0x4 Magic "META".
0x20 ? Title name
0x70 0x4 Absolute offset for ACI0.
0x74 0x4 Size of ACI0.
0x78 0x4 Absolute offset of the RSA signature.
0x7C 0x4 Size used with the above offset. Offset+size is normally ACI0_start-8.

Switch version of 3DS "System Control Info"?

ACID

Offset Size Description
0 0x100 RSA-2048 signature
0x100 0x100 RSA-2048 public key
0x200 0x4 Magic "ACID".
0x204 0x8 Zeroes
0x20C 0x4 Format version? (1)
0x210 0x8 Title id
0x218 0x8 Title id again
0x220 0x4 FS Access Control offset
0x24 0x4 FS Access Control size
0x28 0x4 Service Access Control offset
0x2C 0x4 Service Access Control size
0x30 4 Kernel Access Control offset
0x34 4 Kernel Access Control size
0x38 0x8 Padding

ACI0

Looks like an old crappy version of ACID. It has the guessed version field 0 instead of 1.

Service Access Control

This is a list of service-name strings which the title has access to, with the following structure: 

 +0: control_byte
 +1: {service-name without nul-terminator}

Bitmask 0x0F in control_byte is the {length of the service-name without nul-terminator} - 1.

Bitmask 0x80 in control_byte means service is allowed to be registered.

The service string can contain a wildcard * character.

Access Descriptors

Like the 3DS, the switch has a number of kernel capability descriptors. Unlike 3ds, where descriptors were identified by pattern 11..10 in high bits, on switch descriptors are identified by pattern 01..11 in low bits.

Pattern of bits 20-31 Type Fields
0bxxxxxxxx0111? Interrupt info? ?
0bxxxxxxx01111 System call mask Bits 29-31: System call mask table index; Bits 5-28: mask
0bxxxxx0111111? Kernel release version? ?
0bxxxx01111111? Handle table size? ?
0bxxx011111111? Kernel flags? ?
0bx0111111111? Map address range? ?
0b011111111111? Map memory page? ?


FS Permissions

Bit Description
0 MountContent* is accessible when set.
3 This is only bit set for ShopN in the permissions-u32.
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