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

""" This file creates a simple system with a single CPU and a 2-level cache
and executes 'hello', a simple Hello World application.

This config file assumes that the x86 ISA was built.
See gem5/configs/learning_gem5/part1/two_level.py for a general script.

"""

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

# import the caches which we made
from caches_opts import *

# import the options parser
from optparse import OptionParser

# add the options we want to be able to control from the command line
parser = OptionParser()
parser.add_option('--l1i_size', help="L1 instruction cache size")
parser.add_option('--l1d_size', help="L1 data cache size")
parser.add_option('--l2_size', help="Unified L2 cache size")

(options, args) = parser.parse_args()

# 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 an L1 instruction and data cache
system.cpu.icache = L1ICache(options)
system.cpu.dcache = L1DCache(options)

# Connect the instruction and data caches to the CPU
system.cpu.icache.connectCPU(system.cpu)
system.cpu.dcache.connectCPU(system.cpu)

# Create a memory bus, a coherent crossbar, in this case
system.l2bus = L2XBar()

# Hook the CPU ports up to the l2bus
system.cpu.icache.connectBus(system.l2bus)
system.cpu.dcache.connectBus(system.l2bus)

# Create an L2 cache and connect it to the l2bus
system.l2cache = L2Cache(options)
system.l2cache.connectCPUSideBus(system.l2bus)

# Create a memory bus
system.membus = SystemXBar()

# Connect the L2 cache to the membus
system.l2cache.connectMemSideBus(system.membus)

# create the interrupt controller for the CPU and connect to the membus
# Note: these are directly connected to the memory bus and are not cached
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

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

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

# 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())