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# Copyright (c) 2017 Jason Lowe-Power
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""" This file creates a barebones system and executes 'hello', a simple Hello
World application. Adds a simple cache 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 a memory bus, a coherent crossbar, in this case
system.membus = SystemXBar()

# Create a simple cache
system.cache = SimpleCache(size='1kB')

# Connect the I and D cache ports of the CPU to the memobj.
# Since cpu_side is a vector port, each time one of these is connected, it will
# create a new instance of the CPUSidePort class
system.cpu.icache_port = system.cache.cpu_side
system.cpu.dcache_port = system.cache.cpu_side

# Hook the cache up to the memory bus
system.cache.mem_side = system.membus.cpu_side_ports

# create the interrupt controller for the CPU and connect to the membus
system.cpu.createInterruptController()
system.cpu.interrupts[0].pio = system.membus.mem_side_ports
system.cpu.interrupts[0].int_requestor = system.membus.cpu_side_ports
system.cpu.interrupts[0].int_responder = system.membus.mem_side_ports

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

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

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

system.workload = SEWorkload.init_compatible(binpath)

# 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()))