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# Copyright (c) 2021 The Univerity of Texas at Austin
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#
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# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"""
This script boots with KVM then switches processors and exits.
"""
import argparse
import m5
from m5.objects import Root
from gem5.isas import ISA
from gem5.components.boards.x86_board import X86Board
from gem5.coherence_protocol import CoherenceProtocol
from gem5.components.memory import SingleChannelDDR3_1600
from gem5.components.processors.cpu_types import CPUTypes
from gem5.components.processors.simple_switchable_processor import (
SimpleSwitchableProcessor,
)
from gem5.resources.resource import Resource
from gem5.runtime import (
get_runtime_coherence_protocol, get_runtime_isa
)
from gem5.simulate.simulator import Simulator
from gem5.simulate.exit_event import ExitEvent
from gem5.utils.requires import requires
parser = argparse.ArgumentParser(
description="A script to test switching cpus. This test boots"
"the linux kernel with the KVM cpu, then switches cpus until exiting."
)
parser.add_argument(
"-m",
"--mem-system",
type=str,
choices=("classic", "mi_example", "mesi_two_level"),
required=True,
help="The memory system.",
)
parser.add_argument(
"-n",
"--num-cpus",
type=int,
choices=(1, 2, 4, 8),
required=True,
help="The number of CPUs.",
)
parser.add_argument(
"-c",
"--cpu",
type=str,
choices=("kvm", "atomic", "timing", "o3"),
required=True,
help="The CPU type.",
)
parser.add_argument(
"-r",
"--resource-directory",
type=str,
required=False,
help="The directory in which resources will be downloaded or exist.",
)
parser.add_argument(
"-k",
"--kernel-args",
type=str,
default="init=/root/gem5_init.sh",
help="Additional kernel boot arguments.",
)
args = parser.parse_args()
coherence_protocol_required = None
if args.mem_system == "mi_example":
coherence_protocol_required = CoherenceProtocol.MI_EXAMPLE
elif args.mem_system == "mesi_two_level":
coherence_protocol_required = CoherenceProtocol.MESI_TWO_LEVEL
requires(
isa_required=ISA.X86,
coherence_protocol_required=coherence_protocol_required,
kvm_required=(args.cpu == "kvm"),
)
cache_hierarchy = None
if args.mem_system == "mi_example":
from gem5.components.cachehierarchies.ruby.\
mi_example_cache_hierarchy import (
MIExampleCacheHierarchy,
)
cache_hierarchy = MIExampleCacheHierarchy(size="32kB", assoc=8)
elif args.mem_system == "mesi_two_level":
from gem5.components.cachehierarchies.ruby.\
mesi_two_level_cache_hierarchy import (
MESITwoLevelCacheHierarchy,
)
cache_hierarchy = MESITwoLevelCacheHierarchy(
l1d_size="16kB",
l1d_assoc=8,
l1i_size="16kB",
l1i_assoc=8,
l2_size="256kB",
l2_assoc=16,
num_l2_banks=1,
)
elif args.mem_system == "classic":
from gem5.components.cachehierarchies.classic.\
private_l1_cache_hierarchy import (
PrivateL1CacheHierarchy,
)
cache_hierarchy = PrivateL1CacheHierarchy(l1d_size="16kB", l1i_size="16kB")
else:
raise NotImplementedError(
"Memory system '{}' is not supported in the boot tests.".format(
args.mem_system
)
)
assert cache_hierarchy != None
# Setup the system memory.
memory = SingleChannelDDR3_1600(size="3GB")
# Setup a Processor.
cpu_type = None
if args.cpu == "kvm":
cpu_type = CPUTypes.KVM
elif args.cpu == "atomic":
cpu_type = CPUTypes.ATOMIC
elif args.cpu == "timing":
cpu_type = CPUTypes.TIMING
elif args.cpu == "o3":
cpu_type = CPUTypes.O3
else:
raise NotImplementedError(
"CPU type '{}' is not supported in the boot tests.".format(args.cpu)
)
assert cpu_type != None
processor = SimpleSwitchableProcessor(
starting_core_type=CPUTypes.KVM,
switch_core_type=cpu_type,
num_cores=args.num_cpus,
)
# Setup the motherboard.
motherboard = X86Board(
clk_freq="3GHz",
processor=processor,
memory=memory,
cache_hierarchy=cache_hierarchy,
)
kernal_args = motherboard.get_default_kernel_args() + [args.kernel_args]
# Set the Full System workload.
motherboard.set_kernel_disk_workload(
kernel=Resource(
"x86-linux-kernel-5.4.49",
resource_directory=args.resource_directory,
),
disk_image=Resource(
"x86-ubuntu-img",
resource_directory=args.resource_directory,
),
# The first exit signals to switch processors.
readfile_contents="m5 exit\nm5 exit\n",
kernel_args=kernal_args,
)
# Begin running of the simulation. This will exit once the Linux system boot
# is complete.
print("Running with ISA: " + get_runtime_isa().name)
print("Running with protocol: " + get_runtime_coherence_protocol().name)
print()
simulator = Simulator(
board=motherboard,
on_exit_event={
# When we reach the first exit, we switch cores. For the second exit we
# simply exit the simulation (default behavior).
ExitEvent.EXIT : (i() for i in [processor.switch]),
},
# This parameter allows us to state the expected order-of-execution.
# That is, we expect two exit events. If anyother event is triggered, an
# exeception will be thrown.
expected_execution_order=[ExitEvent.EXIT, ExitEvent.EXIT],
)
simulator.run()
print(
"Exiting @ tick {} because {}.".format(
simulator.get_current_tick(),
simulator.get_last_exit_event_cause(),
)
)