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, LDSTMode
   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     note: rc / oe is needed (later) for st*cx when it comes to setting OV/SO
  14     """
  15     def __init__(self, name=None):
  16         layout = (('insn_type', InternalOp),
  17                   ('imm_data', Layout((("imm", 64), ("imm_ok", 1)))),
  18                   ('zero_a', 1),
  19                   ('rc', Layout((("rc", 1), ("rc_ok", 1)))), # for later
  20                   ('oe', Layout((("oe", 1), ("oe_ok", 1)))), # for later
  21                   ('is_32bit', 1),
  22                   ('is_signed', 1),
  23                   ('data_len', 4),
  24                   ('byte_reverse', 1),
  25                   ('sign_extend', 1),
  26                   ('ldst_mode', LDSTMode))
  27
  28         Record.__init__(self, Layout(layout), name=name)
  29
  30         # grrr.  Record does not have kwargs
  31         self.insn_type.reset_less = True
  32         self.is_32bit.reset_less = True
  33         self.zero_a.reset_less = True
  34         self.is_signed.reset_less = True
  35         self.data_len.reset_less = True
  36         self.byte_reverse.reset_less = True
  37         self.sign_extend.reset_less = True
  38         self.ldst_mode.reset_less = True
  39
  40     def eq_from_execute1(self, other):
  41         """ use this to copy in from Decode2Execute1Type
  42         """
  43         res = []
  44         for fname, sig in self.fields.items():
  45             eqfrom = other.do.fields[fname]
  46             res.append(sig.eq(eqfrom))
  47         return res
  48
  49     def ports(self):
  50         return [self.insn_type,
  51                 self.is_32bit,
  52                 self.zero_a,
  53                 self.is_signed,
  54                 self.data_len,
  55                 self.byte_reverse,
  56                 self.sign_extend,
  57                 self.ldst_mode,
  58         ]
  59