# Copyright (c) 2021 Advanced Micro Devices, Inc.
# All rights reserved.
#
# For use for simulation and test purposes only
#
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
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# this list of conditions and the following disclaimer in the documentation
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# System includes
import argparse
import math

# gem5 related
import m5
from m5.objects import *
from m5.util import addToPath

# gem5 options and objects
addToPath('../../')
from ruby import Ruby
from common import Simulation
from common import ObjectList
from common import Options
from common import GPUTLBOptions
from common import GPUTLBConfig
from amd import AmdGPUOptions

# GPU FS related
from system.system import makeGpuFSSystem


def addRunFSOptions(parser):
    parser.add_argument("--script", default=None,
                        help="Script to execute in the simulated system")
    parser.add_argument("--host-parallel", default=False,
                        action="store_true",
                        help="Run multiple host threads in KVM mode")
    parser.add_argument("--disk-image", default="",
                        help="The boot disk image to mount (/dev/sda)")
    parser.add_argument("--second-disk", default=None,
                        help="The second disk image to mount (/dev/sdb)")
    parser.add_argument("--kernel", default=None, help="Linux kernel to boot")
    parser.add_argument("--gpu-rom", default=None, help="GPU BIOS to load")
    parser.add_argument("--gpu-mmio-trace", default=None,
                        help="GPU MMIO trace to load")


def runGpuFSSystem(args):
    '''
    This function can be called by higher level scripts designed to simulate
    specific devices. As a result the scripts typically hard code some args
    that should not be changed by the user.
    '''

    # These are used by the protocols. They should not be set by the user.
    n_cu = args.num_compute_units
    args.num_sqc = int(math.ceil(float(n_cu) / args.cu_per_sqc))
    args.num_scalar_cache = \
            int(math.ceil(float(n_cu) / args.cu_per_scalar_cache))

    system = makeGpuFSSystem(args)

    root = Root(full_system = True, system = system,
                time_sync_enable = True, time_sync_period = '1000us')

    if args.script is not None:
        system.readfile = args.script

    m5.instantiate()


    print("Running the simulation")
    sim_ticks = args.abs_max_tick

    exit_event = m5.simulate(sim_ticks)

    print('Exiting @ tick %i because %s' %
          (m5.curTick(), exit_event.getCause()))


if __name__ == "__m5_main__":
    # Add gpufs, common, ruby, amdgpu, and gpu tlb args
    parser = argparse.ArgumentParser()
    addRunFSOptions(parser)
    Options.addCommonOptions(parser)
    Ruby.define_options(parser)
    AmdGPUOptions.addAmdGPUOptions(parser)
    GPUTLBOptions.tlb_options(parser)

    args = parser.parse_args()

    runGpuFSSystem(args)