src/soc/sv/svp64.py

   1 # SPDX-License-Identifier: LGPLv3+
   2 # Copyright (C) 2021 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   3 # Funded by NLnet http://nlnet.nl
   4 """SVP64 RM (Remap) Record.
   5
   6 https://libre-soc.org/openpower/sv/svp64/
   7
   8 | Field Name | Field bits | Description                            |
   9 |------------|------------|----------------------------------------|
  10 | MASKMODE   | `0`        | Execution (predication) Mask Kind      |
  11 | MASK          | `1:3`      | Execution Mask                      |
  12 | ELWIDTH       | `4:5`      | Element Width                       |
  13 | ELWIDTH_SRC   | `6:7`      | Element Width for Source            |
  14 | SUBVL         | `8:9`      | Sub-vector length                   |
  15 | EXTRA         | `10:18`    | context-dependent extra             |
  16 | MODE          | `19:23`    | changes Vector behaviour            |
  17 """
  18
  19 from nmigen import Record
  20
  21 class SVP64Rec(Record):
  22     def __init__(self, name=None):
  23         Record.__init__([("mmode"   : 1),
  24                          ("mask"    : 3),
  25                          ("elwidth" : 2),
  26                          ("ewsrc"   : 2),
  27                          ("extra"   : 9),
  28                          ("mode"    : 5), name=name)
  29