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"""
This example runs a simple linux boot.
Characteristics
---------------
* Runs exclusively on the RISC-V ISA with the classic caches
* Assumes that the kernel is compiled into the bootloader
* Automatically generates the DTB file
"""

import m5
from m5.objects import Root

from gem5.components.boards.experimental.lupv_board import LupvBoard
from gem5.components.memory.single_channel import SingleChannelDDR3_1600
from gem5.components.processors.simple_processor import SimpleProcessor
from gem5.components.processors.cpu_types import CPUTypes
from gem5.isas import ISA
from gem5.utils.requires import requires
from gem5.resources.resource import Resource, CustomResource

import argparse

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

from gem5.components.cachehierarchies.classic.\
    private_l1_private_l2_cache_hierarchy import (
    PrivateL1PrivateL2CacheHierarchy,
)

parser = argparse.ArgumentParser(description="Runs Linux fs test with RISCV.")
parser.add_argument(
    "cpu_type",
    choices=("timing", "atomic"),
    help="The type of CPU in the system",
)
parser.add_argument(
    "num_cpus", type=int, help="The number of CPU in the system"
)
parser.add_argument(
    "--max-ticks",
    type=int,
    required=False,
    default=m5.MaxTick,
    help="The maximum number of ticks to simulate. Used for testing.",
)

args = parser.parse_args()

cache_hierarchy = PrivateL1PrivateL2CacheHierarchy(
    l1d_size="32KiB", l1i_size="32KiB", l2_size="512KiB"
)

# Setup the system memory.
memory = SingleChannelDDR3_1600(size="128MB")
# Setup a single core Processor.
if args.cpu_type == "atomic":
    processor = SimpleProcessor(
        cpu_type=CPUTypes.ATOMIC, num_cores=args.num_cpus, isa=ISA.RISCV
    )
elif args.cpu_type == "timing":
    processor = SimpleProcessor(
        cpu_type=CPUTypes.TIMING, num_cores=args.num_cpus, isa=ISA.RISCV
    )

# Setup the board.
board = LupvBoard(
    clk_freq="1GHz",
    processor=processor,
    memory=memory,
    cache_hierarchy=cache_hierarchy,
)
# Set the Full System workload.

board.set_kernel_disk_workload(
    kernel=Resource("riscv-lupio-linux-kernel"),
    disk_image=Resource("riscv-lupio-busybox-img"),
)


# Begin running of the simulation.
print("Running with ISA: " + processor.get_isa().name)
print()
root = Root(full_system=True, system=board)
m5.instantiate()
print("Beginning simulation!")

exit_event = m5.simulate(args.max_ticks)

print(
    "Exiting @ tick {} because {}.".format(m5.curTick(), exit_event.getCause())
)