# Copyright (c) 2012, 2017-2018, 2021 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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import math
import m5
from m5.objects import *
from m5.defines import buildEnv
from m5.util import addToPath, fatal

addToPath('../')

from common import ObjectList
from common import MemConfig
from common import FileSystemConfig

from topologies import *
from network import Network

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

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

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

    # Options related to cache structure
    parser.add_argument(
        "--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_argument(
        "--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_argument(
        "--interleaving-bits", type=int, default=0,
        help="number of bits to specify interleaving " \
           "in directory, memory controllers and caches. "
           "0 = not specified")
    parser.add_argument(
        "--xor-low-bit", type=int, default=20,
        help="hashing bit for channel selection" \
           "see MemConfig for explanation of the default"\
           "parameter. If set to 0, xor_high_bit is also"\
           "set to 0.")

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

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

def setup_memory_controllers(system, ruby, dir_cntrls, options):
    if (options.numa_high_bit):
        block_size_bits = options.numa_high_bit + 1 - \
                          int(math.log(options.num_dirs, 2))
        ruby.block_size_bytes = 2 ** (block_size_bits)
    else:
        ruby.block_size_bytes = options.cacheline_size

    ruby.memory_size_bits = 48

    index = 0
    mem_ctrls = []
    crossbars = []

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

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

        dir_ranges = []
        for r in system.mem_ranges:
            mem_type = ObjectList.mem_list.get(options.mem_type)
            dram_intf = MemConfig.create_mem_intf(mem_type, r, index,
                int(math.log(options.num_dirs, 2)),
                intlv_size, options.xor_low_bit)
            if issubclass(mem_type, DRAMInterface):
                mem_ctrl = m5.objects.MemCtrl(dram = dram_intf)
            else:
                mem_ctrl = dram_intf

            if options.access_backing_store:
                dram_intf.kvm_map=False

            mem_ctrls.append(mem_ctrl)
            dir_ranges.append(dram_intf.range)

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

            # Enable low-power DRAM states if option is set
            if issubclass(mem_type, DRAMInterface):
                mem_ctrl.dram.enable_dram_powerdown = \
                        options.enable_dram_powerdown

        index += 1
        dir_cntrl.addr_ranges = dir_ranges

    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 = [],
                  bootmem=None, cpus=None):

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

    # Generate pseudo filesystem
    FileSystemConfig.config_filesystem(system, options)

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

    if cpus is None:
        cpus = system.cpu

    protocol = buildEnv['PROTOCOL']
    exec("from . import %s" % protocol)
    try:
        (cpu_sequencers, dir_cntrls, topology) = \
             eval("%s.create_system(options, full_system, system, dma_ports,\
                                    bootmem, ruby, cpus)"
                  % 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)

    # Register the topology elements with faux filesystem (SE mode only)
    if not full_system:
        topology.registerTopology(options)


    # 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_request_port = piobus.cpu_side_ports

    # 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.in_ports

    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.connectIOPorts(piobus)

    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 create_directories(options, bootmem, ruby_system, system):
    dir_cntrl_nodes = []
    for i in range(options.num_dirs):
        dir_cntrl = Directory_Controller()
        dir_cntrl.version = i
        dir_cntrl.directory = RubyDirectoryMemory()
        dir_cntrl.ruby_system = ruby_system

        exec("ruby_system.dir_cntrl%d = dir_cntrl" % i)
        dir_cntrl_nodes.append(dir_cntrl)

    if bootmem is not None:
        rom_dir_cntrl = Directory_Controller()
        rom_dir_cntrl.directory = RubyDirectoryMemory()
        rom_dir_cntrl.ruby_system = ruby_system
        rom_dir_cntrl.version = i + 1
        rom_dir_cntrl.memory = bootmem.port
        rom_dir_cntrl.addr_ranges = bootmem.range
        return (dir_cntrl_nodes, rom_dir_cntrl)

    return (dir_cntrl_nodes, None)

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
    # 3. The local exclusive monitor in ARM systems
    if options.cpu_type == "DerivO3CPU" or \
       buildEnv['TARGET_ISA'] in ('x86', 'arm'):
        return True
    return False
