1# -*- coding: utf-8 -*-
2# Copyright (c) 2015 Jason Power
3# All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions are
7# met: redistributions of source code must retain the above copyright
8# notice, this list of conditions and the following disclaimer;
9# redistributions in binary form must reproduce the above copyright
10# notice, this list of conditions and the following disclaimer in the
11# documentation and/or other materials provided with the distribution;
12# neither the name of the copyright holders nor the names of its
13# contributors may be used to endorse or promote products derived from
14# this software without specific prior written permission.
15#
16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27#
28# Authors: Jason Power
29
30""" This file creates a barebones system and executes 'hello', a simple Hello
31World application.
32See Part 1, Chapter 2: Creating a simple configuration script in the
33learning_gem5 book for more information about this script.
34
35IMPORTANT: If you modify this file, it's likely that the Learning gem5 book
36           also needs to be updated. For now, email Jason <power.jg@gmail.com>
37
38"""
39
40from __future__ import print_function
41from __future__ import absolute_import
42
43
44# import the m5 (gem5) library created when gem5 is built
45import m5
46# import all of the SimObjects
47from m5.objects import *
48
49# create the system we are going to simulate
50system = System()
51
52# Set the clock fequency of the system (and all of its children)
53system.clk_domain = SrcClockDomain()
54system.clk_domain.clock = '1GHz'
55system.clk_domain.voltage_domain = VoltageDomain()
56
57# Set up the system
58system.mem_mode = 'timing'               # Use timing accesses
59system.mem_ranges = [AddrRange('512MB')] # Create an address range
60
61# Create a simple CPU
62system.cpu = TimingSimpleCPU()
63
64# Create a memory bus, a system crossbar, in this case
65system.membus = SystemXBar()
66
67# Hook the CPU ports up to the membus
68system.cpu.icache_port = system.membus.slave
69system.cpu.dcache_port = system.membus.slave
70
71# create the interrupt controller for the CPU and connect to the membus
72system.cpu.createInterruptController()
73
74# For x86 only, make sure the interrupts are connected to the memory
75# Note: these are directly connected to the memory bus and are not cached
76if m5.defines.buildEnv['TARGET_ISA'] == "x86":
77    system.cpu.interrupts[0].pio = system.membus.master
78    system.cpu.interrupts[0].int_master = system.membus.slave
79    system.cpu.interrupts[0].int_slave = system.membus.master
80
81# Create a DDR3 memory controller and connect it to the membus
82system.mem_ctrl = DDR3_1600_8x8()
83system.mem_ctrl.range = system.mem_ranges[0]
84system.mem_ctrl.port = system.membus.master
85
86# Connect the system up to the membus
87system.system_port = system.membus.slave
88
89# get ISA for the binary to run.
90isa = str(m5.defines.buildEnv['TARGET_ISA']).lower()
91
92# Default to running 'hello', use the compiled ISA to find the binary
93# grab the specific path to the binary
94thispath = os.path.dirname(os.path.realpath(__file__))
95binary = os.path.join(thispath, '../../../',
96                      'tests/test-progs/hello/bin/', isa, 'linux/hello')
97
98# Create a process for a simple "Hello World" application
99process = Process()
100# Set the command
101# cmd is a list which begins with the executable (like argv)
102process.cmd = [binary]
103# Set the cpu to use the process as its workload and create thread contexts
104system.cpu.workload = process
105system.cpu.createThreads()
106
107# set up the root SimObject and start the simulation
108root = Root(full_system = False, system = system)
109# instantiate all of the objects we've created above
110m5.instantiate()
111
112print("Beginning simulation!")
113exit_event = m5.simulate()
114print('Exiting @ tick %i because %s' % (m5.curTick(), exit_event.getCause()))
115