text: # 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: Brad Beckmann
  
  from m5.params import *
  from m5.objects import *
  
  from BaseTopology import SimpleTopology
  
  class Mesh(SimpleTopology):
      description='Mesh'
  
      def __init__(self, controllers):
          self.nodes = controllers
  
      # Makes a generic mesh assuming an equal number of cache and directory cntrls
  
      def makeTopology(self, options, network, IntLink, ExtLink, Router):
          nodes = self.nodes
  
          num_routers = options.num_cpus
          num_rows = options.mesh_rows
          print options
  
          # There must be an evenly divisible number of cntrls to routers
          # Also, obviously the number or rows must be <= the number of routers
          cntrls_per_router, remainder = divmod(len(nodes), num_routers)
          #print cntrls_per_router,",,,", remainder,"...",len(nodes),"...",num_routers
          assert(num_rows <= num_routers)
          num_columns = int(num_routers / num_rows)
          assert(num_columns * num_rows == num_routers)
  
          # Create the routers in the mesh
          routers = [Router(router_id=i) for i in range(num_routers)]
          network.routers = routers
  
          # link counter to set unique link ids
          link_count = 0
  
          # Add all but the remainder nodes to the list of nodes to be uniformly
          # distributed across the network.
          network_nodes = []
          remainder_nodes = []
          for node_index in xrange(len(nodes)):
              if node_index < (len(nodes) - remainder):
                  network_nodes.append(nodes[node_index])
              else:
                  remainder_nodes.append(nodes[node_index])
  
          # Connect each node to the appropriate router
          ext_links = []
          for (i, n) in enumerate(network_nodes):
              cntrl_level, router_id = divmod(i, num_routers)
              assert(cntrl_level < cntrls_per_router)
              ext_links.append(ExtLink(link_id=link_count, ext_node=n,
                                      int_node=routers[router_id]))
              link_count += 1
  
          #test print
          #print remainder_nodes
          #print "..."
          #print nodes
          #print "..."
          #print network_nodes
          #print "Over....................."
  
          # Connect the remainding nodes to router 0.  These should only be
          # DMA nodes.
          for (i, node) in enumerate(remainder_nodes):
              print "No.",i,"--",node.type
              assert(node.type == 'DMA_Controller')
              assert(i < remainder)
              ext_links.append(ExtLink(link_id=link_count, ext_node=node,
                                      int_node=routers[0]))
              link_count += 1
  
          network.ext_links = ext_links
  
          # Create the mesh links.  First row (east-west) links then column
          # (north-south) links
          int_links = []
          for row in xrange(num_rows):
              for col in xrange(num_columns):
                  if (col + 1 < num_columns):
                      east_id = col + (row * num_columns)
                      west_id = (col + 1) + (row * num_columns)
                      int_links.append(IntLink(link_id=link_count,
                                              node_a=routers[east_id],
                                              node_b=routers[west_id],
                                              weight=1))
                      link_count += 1
  
          for col in xrange(num_columns):
              for row in xrange(num_rows):
                  if (row + 1 < num_rows):
                      north_id = col + (row * num_columns)
                      south_id = col + ((row + 1) * num_columns)
                      int_links.append(IntLink(link_id=link_count,
                                              node_a=routers[north_id],
                                              node_b=routers[south_id],
                                              weight=2))
                      link_count += 1
  
          network.int_links = int_links
  