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"""
This example runs a simple linux boot on the ArmBoard.

Characteristics
---------------

* Runs exclusively on the ARM ISA with the classic caches
"""

from gem5.isas import ISA
from m5.objects import ArmDefaultRelease
from gem5.utils.requires import requires
from gem5.resources.resource import Resource
from gem5.simulate.simulator import Simulator
from m5.objects import VExpress_GEM5_Foundation
from gem5.components.boards.arm_board import ArmBoard
from gem5.components.processors.simple_processor import SimpleProcessor
from gem5.components.processors.cpu_types import (
    get_cpu_types_str_set,
    get_cpu_type_from_str,
    CPUTypes,
)

import argparse
import importlib

parser = argparse.ArgumentParser(
    description="A script to run the ARM boot exit tests."
)

parser.add_argument(
    "-n",
    "--num-cpus",
    type=int,
    required=True,
    help="The number of CPUs.",
)

parser.add_argument(
    "-c",
    "--cpu",
    type=str,
    choices=get_cpu_types_str_set(),
    required=True,
    help="The CPU type.",
)

parser.add_argument(
    "-m",
    "--mem-system",
    type=str,
    choices=("classic"),
    required=True,
    help="The memory system.",
)

parser.add_argument(
    "-d",
    "--dram-class",
    type=str,
    required=False,
    default="DualChannelDDR3_1600",
    help="The python class for the memory interface to use",
)

parser.add_argument(
    "-t",
    "--tick-exit",
    type=int,
    required=False,
    help="The tick to exit the simulation.",
)

parser.add_argument(
    "-r",
    "--resource-directory",
    type=str,
    required=False,
    help="The directory in which resources will be downloaded or exist.",
)

args = parser.parse_args()

# Run a check to ensure the right version of gem5 is being used.
requires(isa_required=ISA.ARM)

if args.mem_system == "classic":
    from gem5.components.cachehierarchies.classic.private_l1_private_l2_cache_hierarchy import (
        PrivateL1PrivateL2CacheHierarchy,
    )

    # Setup the cache hierarchy.
    cache_hierarchy = PrivateL1PrivateL2CacheHierarchy(
        l1d_size="32KiB", l1i_size="32KiB", l2_size="512KiB"
    )
else:
    raise NotImplementedError(
        "Memory type '{}' is not supported in the boot tests.".format(
            args.mem_system
        )
    )

# Setup the system memory.
python_module = "gem5.components.memory"
memory_class = getattr(importlib.import_module(python_module), args.dram_class)
memory = memory_class(size="4GiB")

# Setup a processor.

cpu_type = get_cpu_type_from_str(args.cpu)

processor = SimpleProcessor(
    cpu_type=cpu_type, num_cores=args.num_cpus, isa=ISA.ARM
)


# The ArmBoard requires a `release` to be specified.

release = ArmDefaultRelease()

# The platform sets up the memory ranges of all the on-chip and off-chip
# devices present on the ARM system.

platform = VExpress_GEM5_Foundation()

# Setup the board.
board = ArmBoard(
    clk_freq="1GHz",
    processor=processor,
    memory=memory,
    cache_hierarchy=cache_hierarchy,
    release=release,
    platform=platform,
)

# Set the Full System workload.
board.set_kernel_disk_workload(
    kernel=Resource(
        "arm64-linux-kernel-5.4.49",
        resource_directory=args.resource_directory,
    ),
    bootloader=Resource(
        "arm64-bootloader-foundation",
        resource_directory=args.resource_directory,
    ),
    disk_image=Resource(
        "arm64-ubuntu-20.04-img",
        resource_directory=args.resource_directory,
    ),
)

simulator = Simulator(board=board)

if args.tick_exit:
    simulator.run(max_ticks=args.tick_exit)
else:
    simulator.run()

print(
    "Exiting @ tick {} because {}.".format(
        simulator.get_current_tick(),
        simulator.get_last_exit_event_cause(),
    )
)