# -*- coding: utf-8 -*-
# Copyright (c) 2016 Jason Lowe-Power
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

import m5
import math
from m5.objects import *
from .fs_tools import *

class MyRubySystem(System):

    def __init__(self, kernel, disk, num_cpus, opts):
        super(MyRubySystem, self).__init__()
        self._opts = opts

        self._host_parallel = True

        # Set up the clock domain and the voltage domain
        self.clk_domain = SrcClockDomain()
        self.clk_domain.clock = '3GHz'
        self.clk_domain.voltage_domain = VoltageDomain()

        self.mem_ranges = [AddrRange(Addr('3GB')), # All data
                           AddrRange(0xC0000000, size=0x100000), # For I/0
                           ]

        self.initFS(num_cpus)

        # Replace these paths with the path to your disk images.
        # The first disk is the root disk. The second could be used for swap
        # or anything else.
        self.setDiskImages(disk, disk)

        # Change this path to point to the kernel you want to use
        self.workload.object_file = kernel
        # Options specified on the kernel command line
        boot_options = ['earlyprintk=ttyS0', 'console=ttyS0', 'lpj=7999923',
                         'root=/dev/hda1']

        self.workload.command_line = ' '.join(boot_options)

        # Create the CPUs for our system.
        self.createCPU(num_cpus)

        self.createMemoryControllersDDR3()

        # Create the cache hierarchy for the system.

        from .MESI_Two_Level import MESITwoLevelCache
        self.caches = MESITwoLevelCache()

        self.caches.setup(self, self.cpu, self.mem_cntrls,
                          [self.pc.south_bridge.ide.dma,
                           self.iobus.mem_side_ports],
                          self.iobus)

        if self._host_parallel:
            # To get the KVM CPUs to run on different host CPUs
            # Specify a different event queue for each CPU
            for i,cpu in enumerate(self.cpu):
                for obj in cpu.descendants():
                    obj.eventq_index = 0

                # the number of eventqs are set based
                # on experiments with few benchmarks

                cpu.eventq_index = i + 1

    def getHostParallel(self):
        return self._host_parallel

    def totalInsts(self):
        return sum([cpu.totalInsts() for cpu in self.cpu])

    def createCPUThreads(self, cpu):
        for c in cpu:
            c.createThreads()

    def createCPU(self, num_cpus):

        # Note KVM needs a VM and atomic_noncaching
        self.cpu = [X86KvmCPU(cpu_id = i)
                    for i in range(num_cpus)]
        self.kvm_vm = KvmVM()
        self.mem_mode = 'atomic_noncaching'
        self.createCPUThreads(self.cpu)

        self.atomicCpu = [AtomicSimpleCPU(cpu_id = i,
                                            switched_out = True)
                            for i in range(num_cpus)]
        self.createCPUThreads(self.atomicCpu)

        self.timingCpu = [TimingSimpleCPU(cpu_id = i,
                                     switched_out = True)
				   for i in range(num_cpus)]
        self.createCPUThreads(self.timingCpu)

    def switchCpus(self, old, new):
        assert(new[0].switchedOut())
        m5.switchCpus(self, list(zip(old, new)))

    def setDiskImages(self, img_path_1, img_path_2):
        disk0 = CowDisk(img_path_1)
        disk2 = CowDisk(img_path_2)
        self.pc.south_bridge.ide.disks = [disk0, disk2]

    def createMemoryControllersDDR3(self):
        self._createMemoryControllers(1, DDR3_1600_8x8)

    def _createMemoryControllers(self, num, cls):
        intlv_bits = int(math.log(num, 2))
        mem_ctrls = []
        for i in range(num):
            interface = cls()
            interface.range = AddrRange(self.mem_ranges[0].start,
                            size = self.mem_ranges[0].size(),
                            intlvHighBit = 7,
                            xorHighBit = 20,
                            intlvBits = intlv_bits,
                            intlvMatch = i)
            ctrl = MemCtrl()
            ctrl.dram = interface
            mem_ctrls.append(ctrl)
        self.mem_cntrls = mem_ctrls

    def initFS(self, cpus):
        self.pc = Pc()

        self.workload = X86FsLinux()

        # North Bridge
        self.iobus = IOXBar()

        # connect the io bus
        # Note: pass in a reference to where Ruby will connect to in the future
        # so the port isn't connected twice.
        self.pc.attachIO(self.iobus, [self.pc.south_bridge.ide.dma])

        ###############################################

        # Add in a Bios information structure.
        self.workload.smbios_table.structures = [X86SMBiosBiosInformation()]

        # Set up the Intel MP table
        base_entries = []
        ext_entries = []
        for i in range(cpus):
            bp = X86IntelMPProcessor(
                    local_apic_id = i,
                    local_apic_version = 0x14,
                    enable = True,
                    bootstrap = (i ==0))
            base_entries.append(bp)
        io_apic = X86IntelMPIOAPIC(
                id = cpus,
                version = 0x11,
                enable = True,
                address = 0xfec00000)
        self.pc.south_bridge.io_apic.apic_id = io_apic.id
        base_entries.append(io_apic)
        pci_bus = X86IntelMPBus(bus_id = 0, bus_type='PCI   ')
        base_entries.append(pci_bus)
        isa_bus = X86IntelMPBus(bus_id = 1, bus_type='ISA   ')
        base_entries.append(isa_bus)
        connect_busses = X86IntelMPBusHierarchy(bus_id=1,
                subtractive_decode=True, parent_bus=0)
        ext_entries.append(connect_busses)
        pci_dev4_inta = X86IntelMPIOIntAssignment(
                interrupt_type = 'INT',
                polarity = 'ConformPolarity',
                trigger = 'ConformTrigger',
                source_bus_id = 0,
                source_bus_irq = 0 + (4 << 2),
                dest_io_apic_id = io_apic.id,
                dest_io_apic_intin = 16)
        base_entries.append(pci_dev4_inta)
        def assignISAInt(irq, apicPin):
            assign_8259_to_apic = X86IntelMPIOIntAssignment(
                    interrupt_type = 'ExtInt',
                    polarity = 'ConformPolarity',
                    trigger = 'ConformTrigger',
                    source_bus_id = 1,
                    source_bus_irq = irq,
                    dest_io_apic_id = io_apic.id,
                    dest_io_apic_intin = 0)
            base_entries.append(assign_8259_to_apic)
            assign_to_apic = X86IntelMPIOIntAssignment(
                    interrupt_type = 'INT',
                    polarity = 'ConformPolarity',
                    trigger = 'ConformTrigger',
                    source_bus_id = 1,
                    source_bus_irq = irq,
                    dest_io_apic_id = io_apic.id,
                    dest_io_apic_intin = apicPin)
            base_entries.append(assign_to_apic)
        assignISAInt(0, 2)
        assignISAInt(1, 1)
        for i in range(3, 15):
            assignISAInt(i, i)
        self.workload.intel_mp_table.base_entries = base_entries
        self.workload.intel_mp_table.ext_entries = ext_entries

        entries = \
           [
            # Mark the first megabyte of memory as reserved
            X86E820Entry(addr = 0, size = '639kB', range_type = 1),
            X86E820Entry(addr = 0x9fc00, size = '385kB', range_type = 2),
            # Mark the rest of physical memory as available
            X86E820Entry(addr = 0x100000,
                    size = '%dB' % (self.mem_ranges[0].size() - 0x100000),
                    range_type = 1),
            ]

        # Reserve the last 16kB of the 32-bit address space for m5ops
        entries.append(X86E820Entry(addr = 0xFFFF0000, size = '64kB',
                                    range_type=2))

        self.workload.e820_table.entries = entries