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# Copyright (c) 2006-2007 The Regents of The University of Michigan
# Copyright (c) 2009 Advanced Micro Devices, Inc.
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# Authors: Brad Beckmann

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

def define_options(parser):
    # By default, ruby uses the simple timing cpu
    parser.set_defaults(cpu_type="timing")

    # ruby network options
    parser.add_option("--topology", type="string", default="Crossbar",
                 help="check src/mem/ruby/network/topologies for complete set")
    parser.add_option("--mesh-rows", type="int", default=1,
                      help="the number of rows in the mesh topology")
    parser.add_option("--garnet-network", type="string", default=None,
                      help="'fixed'|'flexible'")
    parser.add_option("--network-fault-model", action="store_true", default=False,
                      help="enable network fault model: see src/mem/ruby/network/fault_model/")

    # ruby mapping options
    parser.add_option("--numa-high-bit", type="int", default=0,
                      help="high order address bit to use for numa mapping. " \
                           "0 = highest bit, not specified = lowest bit")

    # ruby sparse memory options
    parser.add_option("--use-map", action="store_true", default=False)
    parser.add_option("--map-levels", type="int", default=4)

    parser.add_option("--recycle-latency", type="int", default=10,
                      help="Recycle latency for ruby controller input buffers")

    parser.add_option("--random_seed", type="int", default=1234,
                      help="Used for seeding the random number generator")

    parser.add_option("--ruby_stats", type="string", default="ruby.stats")

    protocol = buildEnv['PROTOCOL']
    exec "import %s" % protocol
    eval("%s.define_options(parser)" % protocol)

def create_topology(controllers, options):
    """ Called from create_system in configs/ruby/<protocol>.py
        Must return an object which is a subclass of BaseTopology
        found in configs/topologies/BaseTopology.py
        This is a wrapper for the legacy topologies.
    """
    exec "import %s as Topo" % options.topology
    topology = eval("Topo.%s(controllers)" % options.topology)
    return topology

def create_system(options, system, piobus = None, dma_ports = []):

    system.ruby = RubySystem(clock = options.clock,
                             stats_filename = options.ruby_stats,
                             no_mem_vec = options.use_map)
    ruby = system.ruby

    protocol = buildEnv['PROTOCOL']
    exec "import %s" % protocol
    try:
        (cpu_sequencers, dir_cntrls, topology) = \
             eval("%s.create_system(options, system, piobus, dma_ports, ruby)"
                  % protocol)
    except:
        print "Error: could not create sytem for ruby protocol %s" % protocol
        raise

    # Create a port proxy for connecting the system port. This is
    # independent of the protocol and kept in the protocol-agnostic
    # part (i.e. here).
    sys_port_proxy = RubyPortProxy(ruby_system = ruby)
    # Give the system port proxy a SimObject parent without creating a
    # full-fledged controller
    system.sys_port_proxy = sys_port_proxy

    # Connect the system port for loading of binaries etc
    system.system_port = system.sys_port_proxy.slave


    #
    # Set the network classes based on the command line options
    #
    if options.garnet_network == "fixed":
        class NetworkClass(GarnetNetwork_d): pass
        class IntLinkClass(GarnetIntLink_d): pass
        class ExtLinkClass(GarnetExtLink_d): pass
        class RouterClass(GarnetRouter_d): pass
    elif options.garnet_network == "flexible":
        class NetworkClass(GarnetNetwork): pass
        class IntLinkClass(GarnetIntLink): pass
        class ExtLinkClass(GarnetExtLink): pass
        class RouterClass(GarnetRouter): pass
    else:
        class NetworkClass(SimpleNetwork): pass
        class IntLinkClass(SimpleIntLink): pass
        class ExtLinkClass(SimpleExtLink): pass
        class RouterClass(BasicRouter): pass

    #
    # Important: the topology must be instantiated before the network and after
    # the controllers. Hence the separation between topology definition and
    # instantiation.
    #
    # gem5 SimObject defined in src/mem/ruby/network/Network.py
    net_topology = Topology()
    net_topology.description = topology.description

    routers, int_links, ext_links = topology.makeTopology(options,
                                    IntLinkClass, ExtLinkClass, RouterClass)

    net_topology.routers = routers
    net_topology.int_links = int_links
    net_topology.ext_links = ext_links


    if options.network_fault_model:
        assert(options.garnet_network == "fixed")
        fault_model = FaultModel()
        network = NetworkClass(ruby_system = ruby, topology = net_topology,\
                               enable_fault_model=True, fault_model = fault_model)
    else:
        network = NetworkClass(ruby_system = ruby, topology = net_topology)

    #
    # Loop through the directory controlers.
    # Determine the total memory size of the ruby system and verify it is equal
    # to physmem.  However, if Ruby memory is using sparse memory in SE
    # mode, then the system should not back-up the memory state with
    # the Memory Vector and thus the memory size bytes should stay at 0.
    # Also set the numa bits to the appropriate values.
    #
    total_mem_size = MemorySize('0B')

    dir_bits = int(math.log(options.num_dirs, 2))

    if options.numa_high_bit:
        numa_bit = options.numa_high_bit
    else:
        # if not specified, use the lowest bits above the block offest
        if dir_bits > 0:
            # add 5 because bits 0-5 are the block offset
            numa_bit = dir_bits + 5
        else:
            numa_bit = 6

    for dir_cntrl in dir_cntrls:
        total_mem_size.value += dir_cntrl.directory.size.value
        dir_cntrl.directory.numa_high_bit = numa_bit

    phys_mem_size = sum(map(lambda mem: mem.range.size(),
                            system.memories.unproxy(system)))
    assert(total_mem_size.value == phys_mem_size)

    ruby_profiler = RubyProfiler(ruby_system = ruby,
                                 num_of_sequencers = len(cpu_sequencers))
    ruby.network = network
    ruby.profiler = ruby_profiler
    ruby.mem_size = total_mem_size
    ruby._cpu_ruby_ports = cpu_sequencers
    ruby.random_seed    = options.random_seed
