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| 1 || 13-10 || If set to 2, enable buf C descriptor.
| 1 || 13-10 || If set to 2, enable buf C descriptor.
|-
|-
| 1 || 31 || Enable special descriptor.
| 1 || 31 || Enable handle descriptor.
|-
|-
| ... || || Special descriptor, if enabled.
| ... || || Handle descriptor, if enabled.
|-
|-
| ... || || Buf X descriptors, each one 2 words.
| ... || || Buf X descriptors, each one 2 words.
|}
|}
=== Special descriptor ===
=== Handle descriptor ===
There can only be one of this descriptor type. It is enabled by bit31 of the second word.
There can only be one of this descriptor type. It is enabled by bit31 of the second word.
| 0 || 0 || ?
| 0 || 0 || ?
|-
|-
| 0 || 4-1 || Number of A-words for this special descriptor.
| 0 || 4-1 || Number of handles.
|-
|-
| 0 || 8-5 || Number of B-words for this special descriptor.
| 0 || 8-5 || Number of B-words for this special descriptor.
|-
|-
| ... || || A-words, purpose unknown.
| ... || || Handles
|-
|-
| ... || || B-words, purpose unknown.
| ... || || B-words, purpose unknown.
== Official marshalling code ==
== Official marshalling code ==
The official marshalling function takes an array of (buf_ptr, size) pairs and a type-field for each such pair.
The official marshalling function takes an array of (buf_ptr, size) pairs and a type-field for each such pair.
Bitmask 0x10 seems to indicate null-terminated strings, but that flag is ignored by the marshalling code.
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