src/soc/sv/svstate.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 """SVSATE SPR Record.  actually a peer of PC (CIA/NIA) and MSR
   5
   6 https://libre-soc.org/openpower/sv/sprs/
   7
   8 | Field | Name     | Description           |
   9 | ----- | -------- | --------------------- |
  10 | 0:6   | maxvl    | Max Vector Length     |
  11 | 7:13  |    vl    | Vector Length         |
  12 | 14:20 | srcstep  | for srcstep = 0..VL-1 |
  13 | 21:27 | dststep  | for dststep = 0..VL-1 |
  14 | 28:29 | subvl    | Sub-vector length     |
  15 | 30:31 | svstep   | for svstep = 0..SUBVL-1  |
  16 """
  17
  18 from nmigen import Record
  19
  20 class SVSTATERec(Record):
  21     def __init__(self, name=None):
  22         Record.__init__(self, layout=[("maxvl"     : 7),
  23                                       ("vl"        : 7),
  24                                       ("srcstep"   : 7),
  25                                       ("dststep"   : 7),
  26                                       ("subvl"     : 2),
  27                                       ("svstep"    : 2)], name=name)
  28