diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_structs.h | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_structs.h b/src/mesa/drivers/dri/i965/brw_structs.h index e1947d5ea64..b47be698a27 100644 --- a/src/mesa/drivers/dri/i965/brw_structs.h +++ b/src/mesa/drivers/dri/i965/brw_structs.h @@ -915,7 +915,11 @@ struct brw_instruction GLuint predicate_control:4; GLuint predicate_inverse:1; GLuint execution_size:3; - GLuint destreg__conditionalmod:4; /* destreg - send, conditionalmod - others */ + /** + * Conditional Modifier for most instructions. On Gen6+, this is also + * used for the SEND instruction's Message Target/SFID. + */ + GLuint destreg__conditionalmod:4; GLuint acc_wr_control:1; GLuint cmpt_control:1; GLuint debug_control:1; @@ -1060,6 +1064,11 @@ struct brw_instruction GLuint pad1:6; } ia16; + /* Extended Message Descriptor for Ironlake (Gen5) SEND instruction. + * + * Does not apply to Gen6+. The SFID/message target moved to bits + * 27:24 of the header (destreg__conditionalmod); EOT is in bits3. + */ struct { GLuint pad:26; @@ -1373,6 +1382,11 @@ struct brw_instruction GLuint end_of_thread:1; } gen7_dp; + /** + * Message Descriptor for Gen4 SEND instructions (no particular message). + * + * See the G45 PRM, Volume 4, Table 14-15. + */ struct { GLuint function_control:16; GLuint response_length:4; @@ -1382,7 +1396,18 @@ struct brw_instruction GLuint end_of_thread:1; } generic; - /* Of this struct, only end_of_thread is not present for gen6. */ + /** + * Message Descriptor for Gen5-7 SEND instructions. + * + * See the Sandybridge PRM, Volume 2 Part 2, Table 8-15. (Sadly, most + * of the information on the SEND instruction is missing from the public + * Ironlake PRM.) + * + * The table claims that bit 31 is reserved/MBZ on Gen6+, but it lies. + * According to the SEND instruction description: + * "The MSb of the message description, the EOT field, always comes from + * bit 127 of the instruction word"...which is bit 31 of this field. + */ struct { GLuint function_control:19; GLuint header_present:1; |