_pages/static/scripts/part2/memoryobject/simple_memobj.py

# -*- coding: utf-8 -*-
# Copyright (c) 2017 Jason Lowe-Power
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# Authors: Jason Lowe-Power

""" This file creates a barebones system and executes 'hello', a simple Hello
World application. Adds a simple memobj between the CPU and the membus.

This config file assumes that the x86 ISA was built.
"""

# import the m5 (gem5) library created when gem5 is built
import m5
# import all of the SimObjects
from m5.objects import *

# create the system we are going to simulate
system = System()

# Set the clock fequency of the system (and all of its children)
system.clk_domain = SrcClockDomain()
system.clk_domain.clock = '1GHz'
system.clk_domain.voltage_domain = VoltageDomain()

# Set up the system
system.mem_mode = 'timing'               # Use timing accesses
system.mem_ranges = [AddrRange('512MB')] # Create an address range

# Create a simple CPU
system.cpu = TimingSimpleCPU()

# Create the simple memory object
system.memobj = SimpleMemobj()

# Hook the CPU ports up to the cache
system.cpu.icache_port = system.memobj.inst_port
system.cpu.dcache_port = system.memobj.data_port

# Create a memory bus, a coherent crossbar, in this case
system.membus = SystemXBar()

# Connect the memobj
system.memobj.mem_side = system.membus.slave

# create the interrupt controller for the CPU and connect to the membus
system.cpu.createInterruptController()
system.cpu.interrupts[0].pio = system.membus.master
system.cpu.interrupts[0].int_master = system.membus.slave
system.cpu.interrupts[0].int_slave = system.membus.master

# Create a DDR3 memory controller and connect it to the membus
system.mem_ctrl = DDR3_1600_8x8()
system.mem_ctrl.range = system.mem_ranges[0]
system.mem_ctrl.port = system.membus.master

# Connect the system up to the membus
system.system_port = system.membus.slave

# Create a process for a simple "Hello World" application
process = Process()
# Set the command
# cmd is a list which begins with the executable (like argv)
process.cmd = ['tests/test-progs/hello/bin/x86/linux/hello']
# Set the cpu to use the process as its workload and create thread contexts
system.cpu.workload = process
system.cpu.createThreads()

# set up the root SimObject and start the simulation
root = Root(full_system = False, system = system)
# instantiate all of the objects we've created above
m5.instantiate()

print('Beginning simulation!')
exit_event = m5.simulate()
print('Exiting @ tick %i because %s' % (m5.curTick(), exit_event.getCause()))