configs/common/Caches.py

# Copyright (c) 2012 ARM Limited
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#
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# Copyright (c) 2006-2007 The Regents of The University of Michigan
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# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
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# this software without specific prior written permission.
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from __future__ import print_function
from __future__ import absolute_import

from m5.defines import buildEnv
from m5.objects import *

# Base implementations of L1, L2, IO and TLB-walker caches. There are
# used in the regressions and also as base components in the
# system-configuration scripts. The values are meant to serve as a
# starting point, and specific parameters can be overridden in the
# specific instantiations.

class L1Cache(Cache):
    assoc = 2
    tag_latency = 2
    data_latency = 2
    response_latency = 2
    mshrs = 4
    tgts_per_mshr = 20

class L1_ICache(L1Cache):
    is_read_only = True
    # Writeback clean lines as well
    writeback_clean = True

class L1_DCache(L1Cache):
    pass

class L2Cache(Cache):
    assoc = 8
    tag_latency = 20
    data_latency = 20
    response_latency = 20
    mshrs = 20
    tgts_per_mshr = 12
    write_buffers = 8

class IOCache(Cache):
    assoc = 8
    tag_latency = 50
    data_latency = 50
    response_latency = 50
    mshrs = 20
    size = '1kB'
    tgts_per_mshr = 12

class PageTableWalkerCache(Cache):
    assoc = 2
    tag_latency = 2
    data_latency = 2
    response_latency = 2
    mshrs = 10
    size = '1kB'
    tgts_per_mshr = 12

    # the x86 table walker actually writes to the table-walker cache
    if buildEnv['TARGET_ISA'] == 'x86':
        is_read_only = False
    else:
        is_read_only = True
        # Writeback clean lines as well
        writeback_clean = True