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# Authors: Steve Reinhardt

from m5.params import *
from m5.objects import *

from BaseTopology import SimpleTopology

class Crossbar(SimpleTopology):
    description='Crossbar'

    def makeTopology(self, options, network, IntLink, ExtLink, Router):
        # Create an individual router for each controller plus one more for
        # the centralized crossbar.  The large numbers of routers are needed
        # because external links do not model outgoing bandwidth in the
        # simple network, but internal links do.

        routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
        xbar = routers[len(self.nodes)] # the crossbar router is the last router created
        network.routers = routers

        ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i])
                        for (i, n) in enumerate(self.nodes)]
        network.ext_links = ext_links

        link_count = len(self.nodes)
        int_links = [IntLink(link_id=(link_count+i),
                             node_a=routers[i], node_b=xbar)
                        for i in range(len(self.nodes))]
        network.int_links = int_links