gem5/configs/common/CacheConfig.py

# Copyright (c) 2012 ARM Limited
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# 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(clock=options.clock,
                                   size=options.l2_size,
                                   assoc=options.l2_assoc,
                                   block_size=options.cacheline_size)

        system.tol2bus = CoherentBus(clock = options.clock, 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