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from m5.SimObject import *
from m5.defines import buildEnv
from m5.params import *
from m5.proxy import *

from m5.objects.DVFSHandler import *
from m5.objects.SimpleMemory import *
from m5.objects.Workload import StubWorkload

class MemoryMode(Enum): vals = ['invalid', 'atomic', 'timing',
                                'atomic_noncaching']

class System(SimObject):
    type = 'System'
    cxx_header = "sim/system.hh"
    cxx_class = 'gem5::System'

    system_port = RequestPort("System port")

    cxx_exports = [
        PyBindMethod("getMemoryMode"),
        PyBindMethod("setMemoryMode"),
    ]

    memories = VectorParam.AbstractMemory(Self.all,
                                          "All memories in the system")
    mem_mode = Param.MemoryMode('atomic', "The mode the memory system is in")

    thermal_model = Param.ThermalModel(NULL, "Thermal model")
    thermal_components = VectorParam.SimObject([],
            "A collection of all thermal components in the system.")

    # When reserving memory on the host, we have the option of
    # reserving swap space or not (by passing MAP_NORESERVE to
    # mmap). By enabling this flag, we accommodate cases where a large
    # (but sparse) memory is simulated.
    mmap_using_noreserve = Param.Bool(False, "mmap the backing store " \
                                          "without reserving swap")

    # The memory ranges are to be populated when creating the system
    # such that these can be passed from the I/O subsystem through an
    # I/O bridge or cache
    mem_ranges = VectorParam.AddrRange([], "Ranges that constitute main memory")

    # The ranges backed by a shadowed ROM
    shadow_rom_ranges = VectorParam.AddrRange([], "Ranges  backed by a " \
                                                  "shadowed ROM")

    shared_backstore = Param.String("", "backstore's shmem segment filename, "
        "use to directly address the backstore from another host-OS process. "
        "Leave this empty to unset the MAP_SHARED flag.")

    cache_line_size = Param.Unsigned(64, "Cache line size in bytes")

    redirect_paths = VectorParam.RedirectPath([], "Path redirections")

    exit_on_work_items = Param.Bool(False, "Exit from the simulation loop when "
                                    "encountering work item annotations.")
    work_item_id = Param.Int(-1, "specific work item id")
    num_work_ids = Param.Int(16, "Number of distinct work item types")
    work_begin_cpu_id_exit = Param.Int(-1,
        "work started on specific id, now exit simulation")
    work_begin_ckpt_count = Param.Counter(0,
        "create checkpoint when work items begin count value is reached")
    work_begin_exit_count = Param.Counter(0,
        "exit simulation when work items begin count value is reached")
    work_end_ckpt_count = Param.Counter(0,
        "create checkpoint when work items end count value is reached")
    work_end_exit_count = Param.Counter(0,
        "exit simulation when work items end count value is reached")
    work_cpus_ckpt_count = Param.Counter(0,
        "create checkpoint when active cpu count value is reached")

    workload = Param.Workload(StubWorkload(), "Workload to run on this system")
    init_param = Param.UInt64(0, "numerical value to pass into simulator")
    readfile = Param.String("", "file to read startup script from")
    symbolfile = Param.String("", "file to get the symbols from")

    multi_thread = Param.Bool(False,
            "Supports multi-threaded CPUs? Impacts Thread/Context IDs")

    # Dynamic voltage and frequency handler for the system, disabled by default
    # Provide list of domains that need to be controlled by the handler
    dvfs_handler = DVFSHandler()

    # SE mode doesn't use the ISA System subclasses, and so we need to set an
    # ISA specific value in this class directly.
    m5ops_base = Param.Addr(
        0xffff0000 if buildEnv['TARGET_ISA'] == 'x86' else 0,
        "Base of the 64KiB PA range used for memory-mapped m5ops. Set to 0 "
        "to disable.")

    if buildEnv['USE_KVM']:
        kvm_vm = Param.KvmVM(NULL, 'KVM VM (i.e., shared memory domain)')