src/soc/fu/shift_rot/sr_input_record.py

   1 from nmigen.hdl.rec import Record, Layout
   2
   3 from soc.decoder.power_enums import InternalOp, Function, CryIn
   4
   5
   6 class CompSROpSubset(Record):
   7     """CompSROpSubset
   8
   9     a copy of the relevant subset information from Decode2Execute1Type
  10     needed for ALU 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                   ('imm_data', Layout((("imm", 64), ("imm_ok", 1)))),
  17                     #'cr = Signal(32, reset_less=True) # NO: this is from the CR SPR
  18                     #'xerc = XerBits() # NO: this is from the XER SPR
  19                   ('lk', 1),
  20                   ('rc', Layout((("rc", 1), ("rc_ok", 1)))),
  21                   ('oe', Layout((("oe", 1), ("oe_ok", 1)))),
  22                   ('write_cr', Layout((("data", 3), ("ok", 1)))), # Data
  23                   ('input_carry', CryIn),
  24                   ('output_carry', 1),
  25                   ('input_cr', 1),
  26                   ('output_cr', 1),
  27                   ('is_32bit', 1),
  28                   ('is_signed', 1),
  29                   ('data_len', 4), # actually used by ALU, in OP_EXTS
  30                   ('insn', 32),
  31                   ('byte_reverse', 1),
  32                   ('sign_extend', 1))
  33
  34         Record.__init__(self, Layout(layout), name=name)
  35
  36         # grrr.  Record does not have kwargs
  37         self.insn_type.reset_less = True
  38         self.fn_unit.reset_less = True
  39         #self.cr = Signal(32, reset_less = True
  40         #self.xerc = XerBits(
  41         self.lk.reset_less = True
  42         self.input_carry.reset_less = True
  43         self.output_carry.reset_less = True
  44         self.input_cr.reset_less = True
  45         self.output_cr.reset_less = True
  46         self.is_32bit.reset_less = True
  47         self.is_signed.reset_less = True
  48         self.data_len.reset_less = True
  49         self.byte_reverse.reset_less = True
  50         self.sign_extend.reset_less = True
  51
  52     def eq_from_execute1(self, other):
  53         """ use this to copy in from Decode2Execute1Type
  54         """
  55         res = []
  56         for fname, sig in self.fields.items():
  57             eqfrom = other.fields[fname]
  58             res.append(sig.eq(eqfrom))
  59         return res
  60
  61     def ports(self):
  62         return [self.insn_type,
  63                 #self.cr,
  64                 #self.xerc,
  65                 self.lk,
  66                 self.input_carry,
  67                 self.output_carry,
  68                 self.input_cr,
  69                 self.output_cr,
  70                 self.is_32bit,
  71                 self.is_signed,
  72                 self.data_len,
  73                 self.byte_reverse,
  74                 self.sign_extend,
  75         ]