src/soc/fu/shift_rot/pipe_data.py

   1 from soc.fu.shift_rot.sr_input_record import CompSROpSubset
   2 from soc.fu.pipe_data import FUBaseData, CommonPipeSpec
   3 from soc.fu.alu.pipe_data import ALUOutputData
   4
   5
   6 class ShiftRotInputData(FUBaseData):
   7     def __init__(self, pspec):
   8         super().__init__(pspec, False)
   9         # convenience
  10         self.a, self.b, self.rs = self.ra, self.rb, self.rc
  11
  12     @property
  13     def regspec(self):
  14         return [('INT', 'ra', self.intrange),  # RA
  15                ('INT', 'rb', self.intrange),  # RB/immediate
  16                ('INT', 'rc', self.intrange),  # RB/immediate
  17                ('XER', 'xer_so', '32'), # XER bit 32: SO
  18                ('XER', 'xer_ca', '34,45')] # XER bit 34/45: CA/CA32
  19
  20
  21 # input to shiftrot final stage (common output)
  22 class ShiftRotOutputData(FUBaseData):
  23     def __init__(self, pspec):
  24         super().__init__(pspec, True)
  25         # convenience
  26         self.cr0 = self.cr_a
  27
  28     @property
  29     def regspec(self):
  30         return [('INT', 'o', self.intrange),
  31                ('CR', 'cr_a', '0:3'),
  32                ('XER', 'xer_so', '32'),    # bit0: so
  33                ('XER', 'xer_ca', '34,45'), # XER bit 34/45: CA/CA32
  34                ]
  35
  36
  37 # output from shiftrot final stage (common output) - note that XER.so
  38 # is *not* included (the only reason it's in the input is because of CR0)
  39 class ShiftRotOutputDataFinal(FUBaseData):
  40     def __init__(self, pspec):
  41         super().__init__(pspec, True)
  42         # convenience
  43         self.cr0 = self.cr_a
  44
  45     @property
  46     def regspec(self):
  47         return [('INT', 'o', self.intrange),
  48                ('CR', 'cr_a', '0:3'),
  49                ('XER', 'xer_ca', '34,45'), # XER bit 34/45: CA/CA32
  50                ]
  51
  52
  53 class ShiftRotPipeSpec(CommonPipeSpec):
  54     regspecklses = (ShiftRotInputData, ShiftRotOutputDataFinal)
  55     opsubsetkls = CompSROpSubset