-# Copyright (c) 2012-2013, 2015 ARM Limited
+# Copyright (c) 2012-2013, 2015, 2018 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
from ReplacementPolicies import *
from Tags import *
+
+# Enum for cache clusivity, currently mostly inclusive or mostly
+# exclusive.
+class Clusivity(Enum): vals = ['mostly_incl', 'mostly_excl']
+
+
class BaseCache(MemObject):
type = 'BaseCache'
abstract = True
system = Param.System(Parent.any, "System we belong to")
-# Enum for cache clusivity, currently mostly inclusive or mostly
-# exclusive.
-class Clusivity(Enum): vals = ['mostly_incl', 'mostly_excl']
-
-class Cache(BaseCache):
- type = 'Cache'
- cxx_header = 'mem/cache/cache.hh'
+ # Determine if this cache sends out writebacks for clean lines, or
+ # simply clean evicts. In cases where a downstream cache is mostly
+ # exclusive with respect to this cache (acting as a victim cache),
+ # the clean writebacks are essential for performance. In general
+ # this should be set to True for anything but the last-level
+ # cache.
+ writeback_clean = Param.Bool(False, "Writeback clean lines")
# Control whether this cache should be mostly inclusive or mostly
# exclusive with respect to upstream caches. The behaviour on a
clusivity = Param.Clusivity('mostly_incl',
"Clusivity with upstream cache")
- # Determine if this cache sends out writebacks for clean lines, or
- # simply clean evicts. In cases where a downstream cache is mostly
- # exclusive with respect to this cache (acting as a victim cache),
- # the clean writebacks are essential for performance. In general
- # this should be set to True for anything but the last-level
- # cache.
- writeback_clean = Param.Bool(False, "Writeback clean lines")
+
+class Cache(BaseCache):
+ type = 'Cache'
+ cxx_header = 'mem/cache/cache.hh'
+
+
+class NoncoherentCache(BaseCache):
+ type = 'NoncoherentCache'
+ cxx_header = 'mem/cache/noncoherent_cache.hh'
+
+ # This is typically a last level cache and any clean
+ # writebacks would be unnecessary traffic to the main memory.
+ writeback_clean = False
+