Marshall Portion
This is an array of u32's.
| Word |
Bits |
Description
|
| 0 |
15-0 |
IPC version? Always 4.
|
| 0 |
19-16 |
Number of buf X descriptors (each: 2 words). Type mask: 9
|
| 0 |
23-20 |
Number of buf A descriptors (each: 3 words). Type mask: 5
|
| 0 |
27-24 |
Number of buf B descriptors (each: 3 words). Type mask: 6
|
| 0 |
31-28 |
Number of marshalls type W (each: 3 words), never observed.
|
| 1 |
9-0 |
Size of data portion in u32's.
|
| 1 |
13-10 |
If set to 2, enable buf C descriptor. Type mask: 0xA.
|
| 1 |
31 |
Enable special descriptor.
|
| ... |
|
Special descriptor, if enabled.
|
| ... |
|
Type X descriptors, each one 2 words.
|
| ... |
|
Buf A descriptors, each one 3 words.
|
| ... |
|
Buf B descriptors, each one 3 words.
|
| ... |
|
Type W descriptors, each one 3 words.
|
Special descriptor
There can only be one of this descriptor type. It is enabled by bit31 of the second word.
| Word |
Bits |
Description
|
| 0 |
0 |
?
|
| 0 |
4-1 |
Number of A-words for this special descriptor.
|
| 0 |
8-5 |
Number of B-words for this special descriptor.
|
| ... |
|
A-words, purpose unknown.
|
| ... |
|
B-words, purpose unknown.
|
Buffer descriptor A/B
This packing is so unnecessarily complex.
| Word |
Bits |
Description
|
| 0 |
|
Lower 32-bits of size.
|
| 1 |
|
Lower 32-bits of address.
|
| 2 |
0 |
Always set to 1 or 3. R/RW.
|
| 2 |
4-2 |
Bit 38-36 of address.
|
| 2 |
27-24 |
Bit 35-32 of size.
|
| 2 |
31-28 |
Bit 35-32 of address.
|
Buffer descriptor C
| Word |
Bits |
Description
|
| 0 |
|
Lower 32-bits of address.
|
| 1 |
15-0 |
Rest of address.
|
| 1 |
31-16 |
Size
|
Buffer descriptor X
This one is packed even worse than A, they inserted the bit38-36 of the address on top of the counter field.
| Word |
Bits |
Description
|
| 0 |
5-0 |
Bits 5-0 of counter.
|
| 0 |
8-6 |
Bit 38-36 of address.
|
| 0 |
11-9 |
Bits 11-9 of counter.
|
| 0 |
15-12 |
Bit 35-32 of address.
|
| 0 |
31-16 |
Size
|
| 1 |
|
Lower 32-bits of address.
|
Data Portion
This is an array of u64's placed after the marshall header. But it's always aligned to 16 so sometimes there is padding words inserted inbetween.
| Word |
Description
|
| 0 |
Magic ("SFCI")
|
| 1 |
Cmd id
|
| ... |
Non-marshalled data is placed here
|
| Cmd header 1 |
Cmd header 2 |
Description
|
| 4 |
9 |
Data portion size 20.
|
| 4 |
10 |
Data portion size 24.
|
| 4 |
12 |
Data portion size 32.
|
| 4 |
14 |
Data portion size 40.
|
| 4 |
0x8000000C |
Marshall words: (u32) 1. Data portion size 32.
|