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Line 110: − |} − − Ignored by kernel unless the cmdreply has bufX-descriptor enabled? Probably copies the data from the cmdreply bufX to this bufC? − − === 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. − − {| class="wikitable" border="1" − ! 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.
→IPC Command Structure
| 1 || 9-0 || Total word count (in u32's).
| 1 || 9-0 || Total word count (in u32's).
|-
|-
| 1 || 13-10 || Flags for buf C descriptor. Value 1 = write output data into cmdreply(separate from raw-data). If set to 2, enable buf C descriptor.
| 1 || 13-10 || Flags for buf C descriptor.
|-
|-
| 1 || 31 || Enable handle descriptor.
| 1 || 31 || Enable handle descriptor.
|}
|}
=== Buffer descriptor A/B ===
=== Buffer descriptor X "Pointer" ===
This one is packed even worse than A, they inserted the bit38-36 of the address ''on top'' of the counter field.
Officially, the counter is known as "receive index". This one writes to the buffer described in the ReceiveList.
{| class="wikitable" border="1"
! 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.
|}
=== Buffer descriptor A/B/W "Send"/"Receive"/"Exchange" ===
This packing is so unnecessarily complex.
This packing is so unnecessarily complex.
|}
|}
=== Buffer descriptor C ===
=== Buffer descriptor C "ReceiveList" ===
There's a 4-bit flag in the main header controlling the behavior of C descriptors.
If it has value 0, the C descriptor functionality is disabled. If it has value 1, there is no C descriptor. If it has value 2, there is a single C descriptor.
Otherwise it has (flag-2) C descriptors.
{| class="wikitable" border="1"
{| class="wikitable" border="1"
! Word || Bits || Description
! Word || Bits || Description
|-
|-
| 1 || 31-16 || Size
| 1 || 31-16 || Size
|}
|}