src/soc/config/ifetch.py

   1 """ConfigureableFetchUnit and ConfigMemoryPortInterface
   2
   3 allows the type of FetchUnit to be run-time selectable
   4
   5 this allows the same code to be used for both small unit tests
   6 as well as larger ones and so on, without needing large amounts
   7 of unnecessarily-duplicated code
   8 """
   9 from soc.experiment.imem import TestMemFetchUnit
  10 from soc.bus.test.test_minerva import TestSRAMBareFetchUnit
  11 from soc.minerva.units.fetch import BareFetchUnit
  12
  13
  14 class ConfigFetchUnit:
  15     def __init__(self, pspec):
  16         fudict = {'testmem': TestMemFetchUnit,
  17                    'test_bare_wb': TestSRAMBareFetchUnit,
  18                    'bare_wb': BareFetchUnit,
  19                    #'test_cache_wb': TestCacheFetchUnit
  20                   }
  21         self.pspec = pspec
  22         if self.pspec.imem_ifacetype in ['mmu_cache_wb', 'test_mmu_cache_wb']:
  23             # XXX BLECH! use pspec to transfer the I-Cache which is
  24             # created down inside LoadStore1!
  25             self.fu = icache = pspec.icache # ICache already FetchUnitInterface
  26             # tell I-Cache to connect up to its FetchUnitInterface
  27             icache.use_fetch_interface()
  28             return
  29
  30         fukls = fudict[pspec.imem_ifacetype]
  31         self.fu = fukls(pspec)
  32
  33     def wb_bus(self):
  34         return self.fu.ibus
  35