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 # needed for SVP64 information at the pipeline
   6 from openpower.decoder.power_svp64_rm import sv_input_record_layout
   7
   8 class CompALUOpSubset(CompOpSubsetBase):
   9     """CompALUOpSubset
  10
  11     a copy of the relevant subset information from Decode2Execute1Type
  12     needed for ALU operations.  use with eq_from_execute1 (below) to
  13     grab subsets.
  14     """
  15     def __init__(self, name=None):
  16         layout = [('insn_type', MicrOp),
  17                   ('fn_unit', Function),
  18                   ('imm_data', Layout((("data", 64), ("ok", 1)))),
  19                   ('rc', Layout((("rc", 1), ("ok", 1)))), # Data
  20                   ('oe', Layout((("oe", 1), ("ok", 1)))), # Data
  21                   ('invert_in', 1),
  22                   ('zero_a', 1),
  23                   ('invert_out', 1),
  24                   ('write_cr0', 1),
  25                   ('input_carry', CryIn),
  26                   ('output_carry', 1),
  27                   ('is_32bit', 1),
  28                   ('is_signed', 1),
  29                   ('data_len', 4), # actually used by ALU, in OP_EXTS
  30                   ('insn', 32),
  31                   ] + sv_input_record_layout
  32         super().__init__(layout, name=name)
  33