src/soc/memory_pipe_experiment/memory_op.py

   1 import enum
   2 from nmutil.iocontrol import Object
   3 from nmigen import Signal
   4 from .config import MemoryPipeConfig
   5
   6
   7 class MemoryOpKind(enum.IntEnum):
   8     Fence = enum.auto()
   9     Read = enum.auto()
  10     Write = enum.auto()
  11     AMO = enum.auto()
  12     LoadLinked = enum.auto()
  13     StoreConditional = enum.auto()
  14
  15
  16 class MemoryOpData(Object):
  17     def __init__(self, config: MemoryPipeConfig):
  18         self.config = config
  19         Object.__init__(self)
  20         self.kind = Signal(MemoryOpKind)
  21         self.is_cachable = Signal()
  22         self.blocks_combining_with_earlier_reads = Signal()
  23         self.blocks_combining_with_earlier_writes = Signal()
  24         self.blocks_combining_with_later_reads = Signal()
  25         self.blocks_combining_with_later_writes = Signal()
  26         self.is_speculative = Signal()
  27         self.physical_address = Signal(config.physical_address_bits)
  28         self.byte_mask = Signal(config.bytes_per_cache_line)
  29         self.fu_op_id = Signal(config.fu_op_id_shape,
  30                                reset=self.config.fu_op_id_nop_value)
  31
  32     @property
  33     def is_empty(self):
  34         self.fu_op_id == self.config.fu_op_id_nop_value
  35
  36     def eq_empty(self):
  37         """ assign self to the canonical empty value. """
  38         return self.eq(MemoryOpData(self.config))