src/soc/fu/ldst/pipe_data.py

   1 from soc.fu.ldst.ldst_input_record import CompLDSTOpSubset
   2 from soc.fu.pipe_data import FUBaseData, CommonPipeSpec
   3 from openpower.exceptions import LDSTException
   4
   5 # XXX NOTE: neither of these are actually used at present other than regspecs
   6 # TODO: make use of them in LDSTCompUnit (somehow)
   7
   8 class LDSTInputData(FUBaseData):
   9     regspec = [('INT', 'ra', '0:63'), # RA
  10                ('INT', 'rb', '0:63'), # RB/immediate
  11                ('INT', 'rc', '0:63'), # RC
  12                # XXX TODO, later ('XER', 'xer_so', '32') # XER bit 32: SO
  13                ]
  14     def __init__(self, pspec):
  15         super().__init__(pspec, False)
  16         # convenience
  17         self.rs = self.rc
  18
  19
  20 class LDSTOutputData(FUBaseData):
  21     # these need to tie up with LDSTCompUnit.get_out index numbers
  22     # LDSTCompUnit is unusual in that it's non-standard to RegSpecAPI
  23     regspec = [('INT', 'o', '0:63'),   # RT
  24                ('INT', 'o1', '0:63'),  # RA (effective address, update mode)
  25                ('CR', 'cr_a', '0:3'),
  26                # TODO, later ('XER', 'xer_so', '32')
  27                 ]
  28     def __init__(self, pspec):
  29         super().__init__(pspec, True, LDSTException)
  30         # convenience
  31         self.cr0, self.ea = self.cr_a, self.o1
  32
  33
  34 class LDSTPipeSpec(CommonPipeSpec):
  35     regspecklses = (LDSTInputData, LDSTOutputData)
  36     opsubsetkls = CompLDSTOpSubset