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# Copyright (c) 2016-2017, 2022-2023 Arm Limited
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"""This script is the syscall emulation example script from the ARM
Research Starter Kit on System Modeling. More information can be found
at: http://www.arm.com/ResearchEnablement/SystemModeling
"""
import os
import m5
from m5.util import addToPath
from m5.objects import *
import argparse
import shlex
m5.util.addToPath("../..")
from common import ObjectList
from common import MemConfig
from common.cores.arm import HPI
import devices
# Pre-defined CPU configurations. Each tuple must be ordered as : (cpu_class,
# l1_icache_class, l1_dcache_class, walk_cache_class, l2_Cache_class). Any of
# the cache class may be 'None' if the particular cache is not present.
cpu_types = {
"atomic": (AtomicSimpleCPU, None, None, None),
"minor": (MinorCPU, devices.L1I, devices.L1D, devices.L2),
"hpi": (HPI.HPI, HPI.HPI_ICache, HPI.HPI_DCache, HPI.HPI_L2),
}
class SimpleSeSystem(System):
"""
Example system class for syscall emulation mode
"""
# Use a fixed cache line size of 64 bytes
cache_line_size = 64
def __init__(self, args, **kwargs):
super(SimpleSeSystem, self).__init__(**kwargs)
# Setup book keeping to be able to use CpuClusters from the
# devices module.
self._clusters = []
self._num_cpus = 0
# Create a voltage and clock domain for system components
self.voltage_domain = VoltageDomain(voltage="3.3V")
self.clk_domain = SrcClockDomain(
clock="1GHz", voltage_domain=self.voltage_domain
)
# Create the off-chip memory bus.
self.membus = SystemXBar()
# Wire up the system port that gem5 uses to load the kernel
# and to perform debug accesses.
self.system_port = self.membus.cpu_side_ports
# Add CPUs to the system. A cluster of CPUs typically have
# private L1 caches and a shared L2 cache.
self.cpu_cluster = devices.ArmCpuCluster(
self,
args.num_cores,
args.cpu_freq,
"1.2V",
*cpu_types[args.cpu],
tarmac_gen=args.tarmac_gen,
tarmac_dest=args.tarmac_dest,
)
# Create a cache hierarchy (unless we are simulating a
# functional CPU in atomic memory mode) for the CPU cluster
# and connect it to the shared memory bus.
if self.cpu_cluster.memory_mode() == "timing":
self.cpu_cluster.addL1()
self.cpu_cluster.addL2(self.cpu_cluster.clk_domain)
self.cpu_cluster.connectMemSide(self.membus)
# Tell gem5 about the memory mode used by the CPUs we are
# simulating.
self.mem_mode = self.cpu_cluster.memory_mode()
def numCpuClusters(self):
return len(self._clusters)
def addCpuCluster(self, cpu_cluster):
assert cpu_cluster not in self._clusters
assert len(cpu_cluster) > 0
self._clusters.append(cpu_cluster)
self._num_cpus += len(cpu_cluster)
def numCpus(self):
return self._num_cpus
def get_processes(cmd):
"""Interprets commands to run and returns a list of processes"""
cwd = os.getcwd()
multiprocesses = []
for idx, c in enumerate(cmd):
argv = shlex.split(c)
process = Process(pid=100 + idx, cwd=cwd, cmd=argv, executable=argv[0])
process.gid = os.getgid()
print("info: %d. command and arguments: %s" % (idx + 1, process.cmd))
multiprocesses.append(process)
return multiprocesses
def create(args):
"""Create and configure the system object."""
system = SimpleSeSystem(args)
# Tell components about the expected physical memory ranges. This
# is, for example, used by the MemConfig helper to determine where
# to map DRAMs in the physical address space.
system.mem_ranges = [AddrRange(start=0, size=args.mem_size)]
# Configure the off-chip memory system.
MemConfig.config_mem(args, system)
# Parse the command line and get a list of Processes instances
# that we can pass to gem5.
processes = get_processes(args.commands_to_run)
if len(processes) != args.num_cores:
print(
"Error: Cannot map %d command(s) onto %d CPU(s)"
% (len(processes), args.num_cores)
)
sys.exit(1)
system.workload = SEWorkload.init_compatible(processes[0].executable)
# Assign one workload to each CPU
for cpu, workload in zip(system.cpu_cluster.cpus, processes):
cpu.workload = workload
return system
def main():
parser = argparse.ArgumentParser(epilog=__doc__)
parser.add_argument(
"commands_to_run",
metavar="command(s)",
nargs="*",
help="Command(s) to run",
)
parser.add_argument(
"--cpu",
type=str,
choices=list(cpu_types.keys()),
default="atomic",
help="CPU model to use",
)
parser.add_argument("--cpu-freq", type=str, default="4GHz")
parser.add_argument(
"--num-cores", type=int, default=1, help="Number of CPU cores"
)
parser.add_argument(
"--mem-type",
default="DDR3_1600_8x8",
choices=ObjectList.mem_list.get_names(),
help="type of memory to use",
)
parser.add_argument(
"--mem-channels", type=int, default=2, help="number of memory channels"
)
parser.add_argument(
"--mem-ranks",
type=int,
default=None,
help="number of memory ranks per channel",
)
parser.add_argument(
"--mem-size",
action="store",
type=str,
default="2GB",
help="Specify the physical memory size",
)
parser.add_argument(
"--tarmac-gen",
action="store_true",
help="Write a Tarmac trace.",
)
parser.add_argument(
"--tarmac-dest",
choices=TarmacDump.vals,
default="stdoutput",
help="Destination for the Tarmac trace output. [Default: stdoutput]",
)
args = parser.parse_args()
# Create a single root node for gem5's object hierarchy. There can
# only exist one root node in the simulator at any given
# time. Tell gem5 that we want to use syscall emulation mode
# instead of full system mode.
root = Root(full_system=False)
# Populate the root node with a system. A system corresponds to a
# single node with shared memory.
root.system = create(args)
# Instantiate the C++ object hierarchy. After this point,
# SimObjects can't be instantiated anymore.
m5.instantiate()
# Start the simulator. This gives control to the C++ world and
# starts the simulator. The returned event tells the simulation
# script why the simulator exited.
event = m5.simulate()
# Print the reason for the simulation exit. Some exit codes are
# requests for service (e.g., checkpoints) from the simulation
# script. We'll just ignore them here and exit.
print(f"{event.getCause()} ({event.getCode()}) @ {m5.curTick()}")
if __name__ == "__m5_main__":
main()