Difference between revisions of "NPDM"

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| <code>0bxxxxxxxxxxxx0111</code>
 
| <code>0bxxxxxxxxxxxx0111</code>
 
| Kernel flags
 
| Kernel flags
|  
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| Bit31-24: ?, bit23-16: ?, bit15-10: ?, bit9-4: ?
 
|-
 
|-
 
| <code>0bxxxxxxxxxxx01111</code>
 
| <code>0bxxxxxxxxxxx01111</code>
 
| Syscall mask
 
| Syscall mask
| Bits 29-31: Syscall mask table index; Bits 28-5: mask
+
| Bits 29-31: Syscall mask table index; Bits 5-28: mask
 
|-
 
|-
 
| <code>0bxxxxxxxxx0111111</code>
 
| <code>0bxxxxxxxxx0111111</code>
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| Interrupt pair
 
| Interrupt pair
 
| Bits 12-21: irq0, bits 20-31: irq1, 0x3FF means empty.
 
| Bits 12-21: irq0, bits 20-31: irq1, 0x3FF means empty.
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|-
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| <code>0xxxx0111111111111</code>
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|
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|
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|-
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| <code>0xxx01111111111111</code>
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| <code>0xx011111111111111</code>
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| <code>0x0111111111111111</code>
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| All ones
 
| All ones

Revision as of 17:42, 16 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".
0xE 1
0xF 1
0x1C 4
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 Retail flag. Must be 1 on retail, on devunit 0 is also allowed.
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 lower bits Type Fields
0bxxxxxxxxxxxx0111 Kernel flags Bit31-24: ?, bit23-16: ?, bit15-10: ?, bit9-4: ?
0bxxxxxxxxxxx01111 Syscall mask Bits 29-31: Syscall mask table index; Bits 5-28: mask
0bxxxxxxxxx0111111 Map IO page (RW) Bits 7-31: page
0bxxxxxxxx01111111 Map IO range Bits 7-30: alternating start page and number of pages, bit31: alternating read-only flag then MemoryAttribute 0x2001/0x42002 selector flag
0bxxxx011111111111 Interrupt pair Bits 12-21: irq0, bits 20-31: irq1, 0x3FF means empty.
0xxxx0111111111111
0xxx01111111111111
0xx011111111111111
0x0111111111111111
All ones Ignored