src/soc/fu/ldst/ldst_input_record.py

   1 from nmigen.hdl.rec import Record, Layout
   2
   3 from soc.decoder.power_enums import InternalOp, Function
   4
   5
   6 class CompLDSTOpSubset(Record):
   7     """CompLDSTOpSubset
   8
   9     a copy of the relevant subset information from Decode2Execute1Type
  10     needed for LD/ST operations.  use with eq_from_execute1 (below) to
  11     grab subsets.
  12     """
  13     def __init__(self, name=None):
  14         layout = (('insn_type', InternalOp),
  15                   ('imm_data', Layout((("imm", 64), ("imm_ok", 1)))),
  16                   ('zero_a', 1),
  17                   ('is_32bit', 1),
  18                   ('is_signed', 1),
  19                   ('data_len', 4),
  20                   ('byte_reverse', 1),
  21                   ('sign_extend', 1),
  22                   ('update', 1))
  23
  24         Record.__init__(self, Layout(layout), name=name)
  25
  26         # grrr.  Record does not have kwargs
  27         self.insn_type.reset_less = True
  28         self.is_32bit.reset_less = True
  29         self.zero_a.reset_less = True
  30         self.is_signed.reset_less = True
  31         self.data_len.reset_less = True
  32         self.byte_reverse.reset_less = True
  33         self.sign_extend.reset_less = True
  34         self.update.reset_less = True
  35
  36     def eq_from_execute1(self, other):
  37         """ use this to copy in from Decode2Execute1Type
  38         """
  39         res = []
  40         for fname, sig in self.fields.items():
  41             eqfrom = other.fields[fname]
  42             res.append(sig.eq(eqfrom))
  43         return res
  44
  45     def ports(self):
  46         return [self.insn_type,
  47                 self.is_32bit,
  48                 self.zero_a,
  49                 self.is_signed,
  50                 self.data_len,
  51                 self.byte_reverse,
  52                 self.sign_extend,
  53                 self.update,
  54         ]
  55