# Copyright (c) 2012 ARM Limited
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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
from m5.util import addToPath, fatal

from common import MemConfig

from topologies import *
from network import Network

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

    parser.add_option("--ruby-clock", action="store", type="string",
                      default='2GHz',
                      help="Clock for blocks running at Ruby system's speed")

    parser.add_option("--access-backing-store", action="store_true", default=False,
                      help="Should ruby maintain a second copy of memory")

    # Options related to cache structure
    parser.add_option("--ports", action="store", type="int", default=4,
                      help="used of transitions per cycle which is a proxy \
                            for the number of ports.")

    # network options are in network/Network.py

    # 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")

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

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

def setup_memory_controllers(system, ruby, dir_cntrls, options):
    ruby.block_size_bytes = options.cacheline_size
    ruby.memory_size_bits = 48
    block_size_bits = int(math.log(options.cacheline_size, 2))

    if options.numa_high_bit:
        numa_bit = options.numa_high_bit
    else:
        # if the numa_bit is not specified, set the directory bits as the
        # lowest bits above the block offset bits, and the numa_bit as the
        # highest of those directory bits
        dir_bits = int(math.log(options.num_dirs, 2))
        numa_bit = block_size_bits + dir_bits - 1

    index = 0
    mem_ctrls = []
    crossbars = []

    # Sets bits to be used for interleaving.  Creates memory controllers
    # attached to a directory controller.  A separate controller is created
    # for each address range as the abstract memory can handle only one
    # contiguous address range as of now.
    for dir_cntrl in dir_cntrls:
        dir_cntrl.directory.numa_high_bit = numa_bit

        crossbar = None
        if len(system.mem_ranges) > 1:
            crossbar = IOXBar()
            crossbars.append(crossbar)
            dir_cntrl.memory = crossbar.slave

        for r in system.mem_ranges:
            mem_ctrl = MemConfig.create_mem_ctrl(
                MemConfig.get(options.mem_type), r, index, options.num_dirs,
                int(math.log(options.num_dirs, 2)), options.cacheline_size)

            if options.access_backing_store:
                mem_ctrl.kvm_map=False

            mem_ctrls.append(mem_ctrl)

            if crossbar != None:
                mem_ctrl.port = crossbar.master
            else:
                mem_ctrl.port = dir_cntrl.memory

        index += 1

    system.mem_ctrls = mem_ctrls

    if len(crossbars) > 0:
        ruby.crossbars = crossbars


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 topologies.%s as Topo" % options.topology
    topology = eval("Topo.%s(controllers)" % options.topology)
    return topology

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

    system.ruby = RubySystem()
    ruby = system.ruby

    # Create the network object
    (network, IntLinkClass, ExtLinkClass, RouterClass, InterfaceClass) = \
        Network.create_network(options, ruby)
    ruby.network = network

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

    # Create the network topology
    topology.makeTopology(options, network, IntLinkClass, ExtLinkClass,
            RouterClass)

    # Initialize network based on topology
    Network.init_network(options, network, InterfaceClass)

    # 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)
    if piobus is not None:
        sys_port_proxy.pio_master_port = piobus.slave

    # 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

    setup_memory_controllers(system, ruby, dir_cntrls, options)

    # Connect the cpu sequencers and the piobus
    if piobus != None:
        for cpu_seq in cpu_sequencers:
            cpu_seq.pio_master_port = piobus.slave
            cpu_seq.mem_master_port = piobus.slave

            if buildEnv['TARGET_ISA'] == "x86":
                cpu_seq.pio_slave_port = piobus.master

    ruby.number_of_virtual_networks = ruby.network.number_of_virtual_networks
    ruby._cpu_ports = cpu_sequencers
    ruby.num_of_sequencers = len(cpu_sequencers)

    # Create a backing copy of physical memory in case required
    if options.access_backing_store:
        ruby.access_backing_store = True
        ruby.phys_mem = SimpleMemory(range=system.mem_ranges[0],
                                     in_addr_map=False)

def send_evicts(options):
    # currently, 2 scenarios warrant forwarding evictions to the CPU:
    # 1. The O3 model must keep the LSQ coherent with the caches
    # 2. The x86 mwait instruction is built on top of coherence invalidations
    if options.cpu_type == "detailed" or buildEnv['TARGET_ISA'] == 'x86':
        return True
    return False
