Difference between revisions of "NPDM"

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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
 
| 0x4
 
| 0x4
−
| Absolute offset for ACI0.
+
| [[#ACI0]] offset
 
|-
 
|-
 
| 0x74
 
| 0x74
 
| 0x4
 
| 0x4
−
| Size of ACI0.
+
| [[#ACI0]] size
 
|-
 
|-
 
| 0x78
 
| 0x78
 
| 0x4
 
| 0x4
−
| Absolute offset of the RSA signature.
+
| [[#ACID]] offset
 
|-
 
|-
 
| 0x7C
 
| 0x7C
 
| 0x4
 
| 0x4
−
| Size used with the above offset. Offset+size is normally ACI0_start-8.
+
| [[#ACID]] size
 
|}
 
|}
  
−
Switch version of 3DS "System Control Info"?
+
= ACID =
−
 
 
−
=ACID=
 
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
Line 65: Line 59:
 
! Description
 
! Description
 
|-
 
|-
−
| 0x0
+
| 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
 +
|-
 +
| 0x224
 +
| 0x4
 +
| [[#FS Access Control]] size
 +
|-
 +
| 0x228
 
| 0x4
 
| 0x4
−
| Magicnum "ACID".
+
| [[#Service Access Control]] offset
 
|-
 
|-
 +
| 0x22C
 
| 0x4
 
| 0x4
−
| 0xCC
+
| [[#Service Access Control]] size
−
| ?
+
|-
 +
| 0x230
 +
| 4
 +
| [[#Kernel Access Control]] offset
 +
|-
 +
| 0x234
 +
| 4
 +
| [[#Kernel Access Control]] size
 +
|-
 +
| 0x238
 +
| 0x8
 +
| Padding
 
|}
 
|}
  
−
Switch version of AccessDesc?
+
= ACI0 =
 +
Looks like an old crappy version of ACID. It has the guessed version field 0 instead of 1.
 +
 
 +
= FS Access Control =
  
−
=ACI0=
 
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
−
! Offset
+
! Word
−
! Size
+
! Bit
 
! Description
 
! Description
 
|-
 
|-
−
| 0x0
+
| 0
−
| 0x4
+
|
−
| Magicnum "ACI0".
+
| Version? Always 1.
 +
|-
 +
| 1
 +
| 0
 +
| MountContent* is accessible when set.
 
|-
 
|-
−
| 0x4
+
| 1
−
| 0xB4
+
| 2
−
| ?
+
| Enables access to [[Filesystem_services|Bis]] partitionID 27 and 28?
 
|}
 
|}
  
 +
Web-applets access control:
 +
* "LibAppletWeb" and "LibAppletOff" have same access control: word0 bit0 set, word1 bit0 and bit3 set, and word2 bit30 set.
 +
* Rest of the web-applets: Same as above except word1 bit0 isn't set.
  
−
Switch version of 3DS ACI(Access Control Info)?
+
= Service Access Control =
 +
This is a list of [[Services_API|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 <code>*</code> character.
 +
 
 +
= Kernel Access Control =
 +
On Switch, descriptors are identified by pattern 01..11 in low bits.
 +
 
 +
{| class="wikitable" border="1"
 +
|-
 +
! Pattern of bits 15-0
 +
! Type
 +
! Fields
 +
|-
 +
| <code>0bxxxxxxxxxxxx0111</code>
 +
| Kernel flags
 +
| 5-0: Main thread priority?
 +
|-
 +
| <code>0bxxxxxxxxxxx01111</code>
 +
| Syscall mask
 +
| Bits 29-31: Syscall mask table index; Bits 5-28: mask
 +
|-
 +
| <code>0bxxxxxxxxx0111111</code>
 +
| Map IO page
 +
| Bits 7-31: page
 +
|-
 +
| <code>0bxxxxxxxx01111111</code>
 +
| Map IO range
 +
| Bits 7-31: page then size alternating
 +
|-
 +
| <code>0bxxxx011111111111</code>
 +
| Interrupt pair
 +
| Bits 12-21: irq0, bits 20-31: irq1, 0x3FF means empty. 
 +
|}

Latest revision as of 21:26, 5 July 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 #ACI0 offset
0x74 0x4 #ACI0 size
0x78 0x4 #ACID offset
0x7C 0x4 #ACID size

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
0x224 0x4 #FS Access Control size
0x228 0x4 #Service Access Control offset
0x22C 0x4 #Service Access Control size
0x230 4 #Kernel Access Control offset
0x234 4 #Kernel Access Control size
0x238 0x8 Padding

ACI0

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

FS Access Control

Word Bit Description
0 Version? Always 1.
1 0 MountContent* is accessible when set.
1 2 Enables access to Bis partitionID 27 and 28?

Web-applets access control:

  • "LibAppletWeb" and "LibAppletOff" have same access control: word0 bit0 set, word1 bit0 and bit3 set, and word2 bit30 set.
  • Rest of the web-applets: Same as above except word1 bit0 isn't set.

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.

Kernel Access Control

On Switch, descriptors are identified by pattern 01..11 in low bits.

Pattern of bits 15-0 Type Fields
0bxxxxxxxxxxxx0111 Kernel flags 5-0: Main thread priority?
0bxxxxxxxxxxx01111 Syscall mask Bits 29-31: Syscall mask table index; Bits 5-28: mask
0bxxxxxxxxx0111111 Map IO page Bits 7-31: page
0bxxxxxxxx01111111 Map IO range Bits 7-31: page then size alternating
0bxxxx011111111111 Interrupt pair Bits 12-21: irq0, bits 20-31: irq1, 0x3FF means empty.
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