# -*- coding: utf-8 -*-
# Copyright (c) 2015 Jason Power
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# Authors: Jason Power

""" This file creates a barebones system and executes 'hello', a simple Hello
World application.
See Part 1, Chapter 2: Creating a simple configuration script in the
learning_gem5 book for more information about this script.

IMPORTANT: If you modify this file, it's likely that the Learning gem5 book
           also needs to be updated. For now, email Jason <power.jg@gmail.com>

"""

from __future__ import print_function

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

# Hook the CPU ports up to the membus
system.cpu.icache_port = system.membus.slave
system.cpu.dcache_port = system.membus.slave

# create the interrupt controller for the CPU and connect to the membus
system.cpu.createInterruptController()

# For x86 only, make sure the interrupts are connected to the memory
# Note: these are directly connected to the memory bus and are not cached
if m5.defines.buildEnv['TARGET_ISA'] == "x86":
    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

# get ISA for the binary to run.
isa = str(m5.defines.buildEnv['TARGET_ISA']).lower()

# Run 'hello' and use the compiled ISA to find the binary
binary = 'tests/test-progs/hello/bin/' + isa + '/linux/hello'

# 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 = [binary]
# 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()))