src/soc/fu/ldst/ldst_input_record.py

   1 from soc.fu.base_input_record import CompOpSubsetBase
   2 from nmigen.hdl.rec import Layout
   3
   4 from openpower.decoder.power_enums import MicrOp, Function, LDSTMode
   5
   6
   7 class CompLDSTOpSubset(CompOpSubsetBase):
   8     """CompLDSTOpSubset
   9
  10     a copy of the relevant subset information from Decode2Execute1Type
  11     needed for LD/ST operations.  use with eq_from_execute1 (below) to
  12     grab subsets.
  13
  14     note: rc / oe is needed (later) for st*cx when it comes to setting OV/SO
  15     """
  16     def __init__(self, name=None):
  17         layout = (('insn_type', MicrOp),
  18                   ('fn_unit', Function),
  19                   ('imm_data', Layout((("data", 64), ("ok", 1)))),
  20                   ('zero_a', 1),
  21                   ('rc', Layout((("rc", 1), ("ok", 1)))), # for later
  22                   ('oe', Layout((("oe", 1), ("ok", 1)))), # for later
  23                   ('msr', 64), # TODO: a lot less bits.  only need PR
  24                   ('is_32bit', 1),
  25                   ('is_signed', 1),
  26                   ('data_len', 4),
  27                   ('byte_reverse', 1),
  28                   ('sign_extend', 1),
  29                   ('ldst_mode', LDSTMode),
  30                   ('insn', 32),
  31                  )
  32
  33         super().__init__(layout, name=name)
  34