configs/common/CacheConfig.py

# Copyright (c) 2012-2013 ARM Limited
# All rights reserved
# 
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
# 
# Copyright (c) 2010 Advanced Micro Devices, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Lisa Hsu

# Configure the M5 cache hierarchy config in one place
#

import m5
from m5.objects import *
from Caches import *

def config_cache(options, system):
    if options.cpu_type == "arm_detailed":
        try:
            from O3_ARM_v7a import *
        except:
            print "arm_detailed is unavailable. Did you compile the O3 model?"
            sys.exit(1)

        dcache_class, icache_class, l2_cache_class = \
            O3_ARM_v7a_DCache, O3_ARM_v7a_ICache, O3_ARM_v7aL2
    else:
        dcache_class, icache_class, l2_cache_class = \
            L1Cache, L1Cache, L2Cache

    if options.l2cache:
        # Provide a clock for the L2 and the L1-to-L2 bus here as they
        # are not connected using addTwoLevelCacheHierarchy. Use the
        # same clock as the CPUs, and set the L1-to-L2 bus width to 32
        # bytes (256 bits).
        system.l2 = l2_cache_class(clk_domain=system.cpu_clk_domain,
                                   size=options.l2_size,
                                   assoc=options.l2_assoc,
                                   block_size=options.cacheline_size)

        system.tol2bus = CoherentBus(clk_domain = system.cpu_clk_domain,
                                     width = 32)
        system.l2.cpu_side = system.tol2bus.master
        system.l2.mem_side = system.membus.slave

    for i in xrange(options.num_cpus):
        if options.caches:
            icache = icache_class(size=options.l1i_size,
                                  assoc=options.l1i_assoc,
                                  block_size=options.cacheline_size)
            dcache = dcache_class(size=options.l1d_size,
                                  assoc=options.l1d_assoc,
                                  block_size=options.cacheline_size)

            # When connecting the caches, the clock is also inherited
            # from the CPU in question
            if buildEnv['TARGET_ISA'] == 'x86':
                system.cpu[i].addPrivateSplitL1Caches(icache, dcache,
                                                      PageTableWalkerCache(),
                                                      PageTableWalkerCache())
            else:
                system.cpu[i].addPrivateSplitL1Caches(icache, dcache)
        system.cpu[i].createInterruptController()
        if options.l2cache:
            system.cpu[i].connectAllPorts(system.tol2bus, system.membus)
        else:
            system.cpu[i].connectAllPorts(system.membus)

    return system