Difference between revisions of "NPDM"
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Line 176: | Line 176: | ||
| Bits 7-31: page then size alternating | | Bits 7-31: page then size alternating | ||
|- | |- | ||
− | | <code> | + | | <code>0bxxxx011111111111</code> |
| 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. | ||
|} | |} |
Revision as of 12:39, 1 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. |
0 | 3 | This is only bit set for ShopN in the permissions-u32. |
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 | ? |
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. |