src/soc/fu/alu/alu_input_record.py

   1 from soc.fu.base_input_record import CompOpSubsetBase
   2 from openpower.decoder.power_enums import MicrOp, Function, CryIn
   3 from nmigen.hdl.rec import Layout
   4
   5
   6 class CompALUOpSubset(CompOpSubsetBase):
   7     """CompALUOpSubset
   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', MicrOp),
  15                   ('fn_unit', Function),
  16                   ('imm_data', Layout((("data", 64), ("ok", 1)))),
  17                   ('rc', Layout((("rc", 1), ("ok", 1)))), # Data
  18                   ('oe', Layout((("oe", 1), ("ok", 1)))), # Data
  19                   ('invert_in', 1),
  20                   ('zero_a', 1),
  21                   ('invert_out', 1),
  22                   ('write_cr0', 1),
  23                   ('input_carry', CryIn),
  24                   ('output_carry', 1),
  25                   ('is_32bit', 1),
  26                   ('is_signed', 1),
  27                   ('data_len', 4), # actually used by ALU, in OP_EXTS
  28                   ('insn', 32),
  29                   )
  30         super().__init__(layout, name=name)
  31