HIPC: Difference between revisions

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@@ Line 7: / Line 7: @@
 | 0 || 15-0 || IPC version? Always 4.
 |-
-| 0 || 19-16 || Number of marshalls type X (each: 2 words). Type mask: 8
+| 0 || 19-16 || Number of buf X descriptors (each: 2 words). Type mask: 9
 |-
-| 0 || 23-20 || Number of buf descriptors (each: 3 words). Type mask: 5
+| 0 || 23-20 || Number of buf A descriptors (each: 3 words). Type mask: 5
 |-
-| 0 || 27-24 || Number of buf2 descriptors (each: 3 words). Type mask: 6
+| 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)
@@ Line 17: / Line 17: @@
 | 1 || 9-0 || Size of data portion in u32's.
 |-
-| 1 || 13-10 || ?
+| 1 || 13-10 || If set to 2, enable buf C descriptor. Type mask: 0xA.
 |-
 | 1 || 31 || Enable special descriptor.
@@ Line 25: / Line 25: @@
 | ... || || Type X descriptors, each one 2 words.
 |-
-| ... || || Buf descriptors, each one 3 words.
+| ... || || Buf A descriptors, each one 3 words.
 |-
-| ... || || Buf2 descriptors, each one 3 words.
+| ... || || Buf B descriptors, each one 3 words.
 |-
 | ... || || Type W descriptors, each one 3 words.
@@ Line 49: / Line 49: @@
 |}
-=== Buf descriptor ===
+=== Buffer descriptor A/B ===
-They fucked up this one, big time.
+This packing is so unnecessarily complex.
 {| class="wikitable" border="1"
@@ Line 68: / Line 68: @@
 |}
-=== Descriptor type B ===
+=== Buffer descriptor C ===
 {| class="wikitable" border="1"
-! Word || Description
+! Word || Bits || Description
 |-
-| 0 || Lower 32-bits of addr?
+| 0 || || Lower 32-bits of address.
 |-
-| 1 || Upper 16bits: Size, Lower 16bits: Rest of addr?
+| 1 || 15-0 || Rest of address.
+|-
+| 1 || 31-16 || Size
 |}
-=== Descriptor type C ===
+=== 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 || Description
+! Word || Bits || Description
 |-
-| 0 || Upper 16bits: Size, Lower 16: ?
+| 0 || 5-0 || Bits 5-0 of counter.
 |-
-| 1 || ?
+| 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.
 |}