src/soc/fu/trap/trap_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 CompTrapOpSubset(Record):
   7     """CompTrapOpSubset
   8
   9     a copy of the relevant subset information from Decode2Execute1Type
  10     needed for TRAP operations.  use with eq_from_execute1 (below) to
  11     grab subsets.
  12     """
  13     def __init__(self, name=None):
  14         layout = (('insn_type', InternalOp),
  15                   ('fn_unit', Function),
  16                   ('insn', 32),
  17                   ('is_32bit', 1),
  18                   ('traptype', 5), # see trap main_stage.py and PowerDecoder2
  19                   ('trapaddr', 13),
  20                   )
  21
  22         Record.__init__(self, Layout(layout), name=name)
  23
  24         # grrr.  Record does not have kwargs
  25         self.insn_type.reset_less = True
  26         self.insn.reset_less = True
  27         self.fn_unit.reset_less = True
  28         self.is_32bit.reset_less = True
  29         self.traptype.reset_less = True
  30         self.trapaddr.reset_less = True
  31
  32     def eq_from_execute1(self, other):
  33         """ use this to copy in from Decode2Execute1Type
  34         """
  35         res = []
  36         for fname, sig in self.fields.items():
  37             eqfrom = other.do.fields[fname]
  38             res.append(sig.eq(eqfrom))
  39         return res
  40
  41     def ports(self):
  42         return [self.insn_type,
  43                 self.insn,
  44                 self.fn_unit,
  45                 self.is_32bit,
  46                 self.traptype,
  47                 self.trapaddr,
  48         ]