package referencechip

import Chisel._
import Node._
import uncore.Constants._
import uncore._
import rocket._
import rocket.Util._
import ReferenceChipBackend._
import scala.collection.mutable.ArrayBuffer
import scala.collection.mutable.HashMap

object TileLinkHeaderAppender {
  def apply[T <: SourcedMessage with HasPhysicalAddress, U <: SourcedMessage with HasMemData](meta: ClientSourcedIO[LogicalNetworkIO[T]], data: ClientSourcedIO[LogicalNetworkIO[U]], clientId: Int, nBanks: Int, bankIdLsb: Int)(implicit conf: UncoreConfiguration) = {
    val shim = (new TileLinkHeaderAppenderWithData(clientId, nBanks, bankIdLsb)){meta.bits.payload.clone}{data.bits.payload.clone}
    shim.io.meta_in <> meta
    shim.io.data_in <> data
    (shim.io.meta_out, shim.io.data_out)
  }
  def apply[T <: SourcedMessage with HasPhysicalAddress](meta: ClientSourcedIO[LogicalNetworkIO[T]], clientId: Int, nBanks: Int, bankIdLsb: Int)(implicit conf: UncoreConfiguration) = {
    val shim = (new TileLinkHeaderAppender(clientId, nBanks, bankIdLsb)){meta.bits.payload.clone}
    shim.io.meta_in <> meta
    shim.io.meta_out
  }
}

abstract class AddressConverter extends Component {
  def convertAddrToBank(addr: Bits, n: Int, lsb: Int): UFix = {
    require(lsb + log2Up(n) < PADDR_BITS - OFFSET_BITS, {println("Invalid bits for bank multiplexing.")})
    addr(lsb + log2Up(n) - 1, lsb)
  }
}

class TileLinkHeaderAppenderWithData[T <: SourcedMessage with HasPhysicalAddress, U <: SourcedMessage with HasMemData](clientId: Int, nBanks: Int, bankIdLsb: Int)(metadata: => T)(data: => U)(implicit conf: UncoreConfiguration) extends AddressConverter {
  implicit val ln = conf.ln
  val io = new Bundle {
    val meta_in = (new ClientSourcedIO){(new LogicalNetworkIO){ metadata }}.flip
    val data_in = (new ClientSourcedIO){(new LogicalNetworkIO){ data }}.flip
    val meta_out = (new ClientSourcedIO){(new LogicalNetworkIO){ metadata }}
    val data_out = (new ClientSourcedIO){(new LogicalNetworkIO){ data }}
  }

  val meta_q = Queue(io.meta_in)
  val data_q = Queue(io.data_in)
  if(nBanks == 1) {
    io.meta_out.bits.payload := meta_q.bits.payload
    io.meta_out.bits.header.src := UFix(clientId)
    io.meta_out.bits.header.dst := UFix(0)
    io.meta_out.valid := meta_q.valid
    meta_q.ready := io.meta_out.ready
    io.data_out.bits.payload := data_q.bits.payload
    io.data_out.bits.header.src := UFix(clientId)
    io.data_out.bits.header.dst := UFix(0)
    io.data_out.valid := data_q.valid
    data_q.ready := io.data_out.ready
  } else {
    val meta_has_data = conf.co.messageHasData(meta_q.bits.payload)
    val addr_q = (new Queue(2, pipe = true, flow = true)){io.meta_in.bits.payload.addr.clone}
    val data_cnt = Reg(resetVal = UFix(0, width = log2Up(REFILL_CYCLES)))
    val data_cnt_up = data_cnt + UFix(1)

    io.meta_out.bits.payload := meta_q.bits.payload
    io.meta_out.bits.header.src := UFix(clientId)
    io.meta_out.bits.header.dst := convertAddrToBank(meta_q.bits.payload.addr, nBanks, bankIdLsb)
    io.data_out.bits.payload := meta_q.bits.payload
    io.data_out.bits.header.src := UFix(clientId)
    io.data_out.bits.header.dst := convertAddrToBank(addr_q.io.deq.bits, nBanks, bankIdLsb)
    addr_q.io.enq.bits := meta_q.bits.payload.addr

    io.meta_out.valid := meta_q.valid && addr_q.io.enq.ready
    meta_q.ready := io.meta_out.ready && addr_q.io.enq.ready
    io.data_out.valid := data_q.valid && addr_q.io.deq.valid
    data_q.ready := io.data_out.ready && addr_q.io.deq.valid
    addr_q.io.enq.valid := meta_q.valid && io.meta_out.ready && meta_has_data
    addr_q.io.deq.ready := Bool(false)

    when(data_q.valid && data_q.ready) {
      data_cnt := data_cnt_up
      when(data_cnt_up === UFix(0)) {
        addr_q.io.deq.ready := Bool(true)
      }
    }
  }
}

class TileLinkHeaderAppender[T <: SourcedMessage with HasPhysicalAddress](clientId: Int, nBanks: Int, bankIdLsb: Int)(metadata: => T)(implicit conf: UncoreConfiguration) extends AddressConverter {
  implicit val ln = conf.ln
  val io = new Bundle {
    val meta_in = (new ClientSourcedIO){(new LogicalNetworkIO){ metadata }}.flip
    val meta_out = (new ClientSourcedIO){(new LogicalNetworkIO){ metadata }}
  }
  val meta_q = Queue(io.meta_in)
  io.meta_out.bits.payload := meta_q.bits.payload
  io.meta_out.bits.header.src := UFix(clientId)
  io.meta_out.valid := meta_q.valid
  meta_q.ready := io.meta_out.ready
  if(nBanks == 1) {
    io.meta_out.bits.header.dst := UFix(0)
  } else {
    io.meta_out.bits.header.dst := convertAddrToBank(meta_q.bits.payload.addr, nBanks, bankIdLsb)
  }
}  

class MemIOUncachedTileLinkIOConverter(qDepth: Int)(implicit conf: UncoreConfiguration) extends Component {
  implicit val ln = conf.ln
  val io = new Bundle {
    val uncached = new UncachedTileLinkIO().flip
    val mem = new ioMem
  }
  val mem_cmd_q = (new Queue(qDepth)){new MemReqCmd}
  val mem_data_q = (new Queue(qDepth)){new MemData}
  mem_cmd_q.io.enq.valid := io.uncached.acquire.valid
  io.uncached.acquire.ready := mem_cmd_q.io.enq.ready 
  mem_cmd_q.io.enq.bits.rw := conf.co.needsOuterWrite(io.uncached.acquire.bits.payload.a_type, UFix(0))
  mem_cmd_q.io.enq.bits.tag := io.uncached.acquire.bits.payload.client_xact_id
  mem_cmd_q.io.enq.bits.addr := io.uncached.acquire.bits.payload.addr
  mem_data_q.io.enq.valid := io.uncached.acquire_data.valid
  io.uncached.acquire_data.ready := mem_data_q.io.enq.ready
  mem_data_q.io.enq.bits.data := io.uncached.acquire_data.bits.payload.data 
  io.uncached.grant.valid := io.mem.resp.valid
  io.mem.resp.ready := io.uncached.grant.ready
  io.uncached.grant.bits.payload.data := io.mem.resp.bits.data
  io.uncached.grant.bits.payload.client_xact_id := io.mem.resp.bits.tag
  io.uncached.grant.bits.payload.master_xact_id := UFix(0) // DNC
  io.uncached.grant.bits.payload.g_type := UFix(0) // DNC
  io.mem.req_cmd <> mem_cmd_q.io.deq
  io.mem.req_data <> mem_data_q.io.deq
}

object TileToCrossbarShim {
  def apply[T <: Data](logIO: ClientSourcedIO[LogicalNetworkIO[T]])(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) = {
    val shim = (new TileToCrossbarShim) { logIO.bits.payload.clone }
    shim.io.in <> logIO
    shim.io.out
  }
}
class TileToCrossbarShim[T <: Data]()(data: => T)(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) extends Component {
  val io = new Bundle {
    val in  = (new ClientSourcedIO){(new LogicalNetworkIO){ data }}.flip
    val out = (new FIFOIO){(new BasicCrossbarIO){ data }}
  }
  io.out.bits.header.src := io.in.bits.header.src + UFix(lconf.nMasters)
  io.out.bits.header.dst := io.in.bits.header.dst 
  io.out.bits.payload := io.in.bits.payload
  io.out.valid := io.in.valid
  io.in.ready := io.out.ready
}

object HubToCrossbarShim {
  def apply[T <: Data](logIO: MasterSourcedIO[LogicalNetworkIO[T]])(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) = {
    val shim = (new HubToCrossbarShim) { logIO.bits.payload.clone }
    shim.io.in <> logIO
    shim.io.out
  }
}
class HubToCrossbarShim[T <: Data]()(data: => T)(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) extends Component {
  val io = new Bundle {
    val in  = (new MasterSourcedIO){(new LogicalNetworkIO){ data }}
    val out = (new FIFOIO){(new BasicCrossbarIO){ data }}
  }
  io.out.bits.header.src := io.in.bits.header.src
  io.out.bits.header.dst := io.in.bits.header.dst + UFix(lconf.nMasters)
  io.out.bits.payload := io.in.bits.payload
  io.out.valid := io.in.valid
  io.in.ready := io.out.ready
}

object CrossbarToTileShim {
  def apply[T <: Data](physIO: FIFOIO[BasicCrossbarIO[T]])(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) = {
    val shim = (new CrossbarToTileShim) { physIO.bits.payload.clone }
    shim.io.in <> physIO
    shim.io.out
  }
}
class CrossbarToTileShim[T <: Data]()(data: => T)(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) extends Component {
  val io = new Bundle {
    val in  = (new FIFOIO){(new BasicCrossbarIO){ data }}.flip
    val out = (new ClientSourcedIO){(new LogicalNetworkIO){ data }}
  }
  io.out.bits.header.src := io.in.bits.header.src
  io.out.bits.header.dst := io.in.bits.header.dst - UFix(lconf.nMasters)
  io.out.bits.payload := io.in.bits.payload
  io.out.valid := io.in.valid
  io.in.ready := io.out.ready
}

object CrossbarToHubShim {
  def apply[T <: Data](physIO: FIFOIO[BasicCrossbarIO[T]])(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) = {
    val shim = (new CrossbarToHubShim) { physIO.bits.payload.clone }
    shim.io.in <> physIO
    shim.io.out
  }
}
class CrossbarToHubShim[T <: Data]()(data: => T)(implicit lconf: LogicalNetworkConfiguration, pconf: PhysicalNetworkConfiguration) extends Component {
  val io = new Bundle {
    val in  = (new FIFOIO){(new BasicCrossbarIO){ data }}.flip
    val out = (new MasterSourcedIO){(new LogicalNetworkIO){ data }}.flip
  }
  io.out.bits.header.src := io.in.bits.header.src - UFix(lconf.nMasters)
  io.out.bits.header.dst := io.in.bits.header.dst
  io.out.bits.payload := io.in.bits.payload
  io.out.valid := io.in.valid
  io.in.ready := io.out.ready
}

class ReferenceChipCrossbarNetwork(endpoints: Seq[CoherenceAgentRole])(implicit conf: LogicalNetworkConfiguration) extends LogicalNetwork[TileLinkIO](endpoints)(conf) {
  type TileLinkType = TileLinkIO
  val io = Vec(endpoints.map(_ match { case t:ClientCoherenceAgent => {(new TileLinkType).flip}; case h:MasterCoherenceAgent => {new TileLinkType}})){ new TileLinkType }

  //If we allow all physical networks to be identical, we can use
  //reflection to automatically create enough networks for any given 
  //bundle containing LogicalNetworkIOs
  val tl = new TileLinkType
  val tileLinkDirectionalFIFOs = tl.getClass.getMethods.filter( x => 
      classOf[DirectionalFIFOIO[Data]].isAssignableFrom(x.getReturnType))
  val payloadBitsForEachPhysicalNetwork = tileLinkDirectionalFIFOs.map(
      _.invoke(tl).asInstanceOf[DirectionalFIFOIO[LogicalNetworkIO[Data]]].bits.payload)
  val lockCountForEachPhysicalNetwork = tileLinkDirectionalFIFOs.map( x =>
      if(classOf[ClientSourcedDataIO[Data]].isAssignableFrom(x.getReturnType)) REFILL_CYCLES else 1)
  implicit val pconf = new PhysicalNetworkConfiguration(conf.nEndpoints, conf.idBits)//same config for all networks
  val physicalNetworks: Seq[BasicCrossbar[Data]] = lockCountForEachPhysicalNetwork zip payloadBitsForEachPhysicalNetwork map { case (c,d) => (new BasicCrossbar(c)){d.clone} }

  //Use reflection to get the subset of each node's TileLink
  //corresponding to each direction of dataflow and connect each sub-bundle
  //to the appropriate port of the physical crossbar network, inserting
  //shims to convert headers and process flits in the process.
  endpoints.zip(io).zipWithIndex.map{ case ((end, io), id) => {
    val logNetIOSubBundles = io.getClass.getMethods.filter( x => 
      classOf[DirectionalFIFOIO[Data]].isAssignableFrom(x.getReturnType)).zipWithIndex
    val tileProducedSubBundles = logNetIOSubBundles.filter( x =>
      classOf[ClientSourcedIO[Data]].isAssignableFrom(x._1.getReturnType)).map{ case (m,i) =>
        (m.invoke(io).asInstanceOf[ClientSourcedIO[LogicalNetworkIO[Data]]],i) }
    val hubProducedSubBundles  = logNetIOSubBundles.filter( x =>
      classOf[MasterSourcedIO[Data]].isAssignableFrom(x._1.getReturnType)).map{ case (m,i) =>
        (m.invoke(io).asInstanceOf[MasterSourcedIO[LogicalNetworkIO[Data]]],i) }
    end match {
      case x:ClientCoherenceAgent => {
        tileProducedSubBundles.foreach{ case (sl,i) => { 
          physicalNetworks(i).io.in(id) <> TileToCrossbarShim(sl) 
          physicalNetworks(i).io.out(id).ready := Bool(false)
        }}
        hubProducedSubBundles.foreach{ case (sl,i) => {
          sl <> CrossbarToTileShim(physicalNetworks(i).io.out(id)) 
          physicalNetworks(i).io.in(id).valid := Bool(false)
        }}
      }
      case y:MasterCoherenceAgent => {
        hubProducedSubBundles.foreach{ case (sl,i) => {
          physicalNetworks(i).io.in(id) <> HubToCrossbarShim(sl) 
          physicalNetworks(i).io.out(id).ready := Bool(false)
        }}
        tileProducedSubBundles.foreach{ case (sl,i) => {
          sl <> CrossbarToHubShim(physicalNetworks(i).io.out(id)) 
          physicalNetworks(i).io.in(id).valid := Bool(false)
        }}
      }
    }
  }}
}

object ReferenceChipBackend {
  val initMap = new HashMap[Component, Bool]()
}

class ReferenceChipBackend extends VerilogBackend
{
  override def emitPortDef(m: MemAccess, idx: Int) = {
    val res = new StringBuilder()
    for (node <- m.mem.inputs) {
      if(node.name.contains("init"))
         res.append("    .init(" + node.name + "),\n")
    }
    (if (idx == 0) res.toString else "") + super.emitPortDef(m, idx)
  }

  def addMemPin(c: Component) = {
    for (node <- Component.nodes) {
      if (node.isInstanceOf[Mem[ _ ]] && node.component != null && node.asInstanceOf[Mem[_]].seqRead) {
        connectMemPin(c, node.component, node)
      }
    }
  }

  def connectMemPin(topC: Component, c: Component, p: Node): Unit = {
    var isNewPin = false
    val compInitPin = 
      if (initMap.contains(c)) {
        initMap(c)
      } else {
        isNewPin = true
        Bool(INPUT)
      }

    p.inputs += compInitPin

    if (isNewPin) {
      compInitPin.setName("init")
      c.io.asInstanceOf[Bundle] += compInitPin
      compInitPin.component = c
      initMap += (c -> compInitPin)
      connectMemPin(topC, c.parent, compInitPin)
    }
  }

  def addTopLevelPin(c: Component) = {
    val init = Bool(INPUT)
    init.setName("init")
    init.component = c
    c.io.asInstanceOf[Bundle] += init
    initMap += (c -> init)
  }

  transforms += ((c: Component) => addTopLevelPin(c))
  transforms += ((c: Component) => addMemPin(c))
}

class OuterMemorySystem(htif_width: Int, clientEndpoints: Seq[ClientCoherenceAgent])(implicit conf: UncoreConfiguration) extends Component
{
  implicit val lnconf = conf.ln
  val io = new Bundle {
    val tiles = Vec(conf.ln.nClients) { new TileLinkIO }.flip
    val htif = (new TileLinkIO).flip
    val incoherent = Vec(conf.ln.nClients) { Bool() }.asInput
    val mem_backup = new ioMemSerialized(htif_width)
    val mem_backup_en = Bool(INPUT)
    val mem = new ioMem
  }

  import rocket.Constants._

  val lnWithHtifConf = conf.ln.copy(nEndpoints = conf.ln.nEndpoints+1, 
                                    idBits = log2Up(conf.ln.nEndpoints+1)+1,
                                    nClients = conf.ln.nClients+1)
  val ucWithHtifConf = conf.copy(ln = lnWithHtifConf)
  require(clientEndpoints.length == lnWithHtifConf.nClients)
  val masterEndpoints = (0 until lnWithHtifConf.nMasters).map(new L2CoherenceAgent(_)(ucWithHtifConf))

  val llc_tag_leaf = Mem(512, seqRead = true) { Bits(width = 152) }
  val llc_data_leaf = Mem(4096, seqRead = true) { Bits(width = 64) }
  val llc = new DRAMSideLLC(512, 8, 4, llc_tag_leaf, llc_data_leaf)
  //val llc = new DRAMSideLLCNull(NGLOBAL_XACTS, REFILL_CYCLES)
  val mem_serdes = new MemSerdes(htif_width)

  val net = new ReferenceChipCrossbarNetwork(masterEndpoints++clientEndpoints)(lnWithHtifConf)
  net.io zip (masterEndpoints.map(_.io.client) ++ io.tiles :+ io.htif) map { case (net, end) => net <> end }
  masterEndpoints.map{ _.io.incoherent zip (io.incoherent ++ List(Bool(true))) map { case (m, c) => m := c } }

  val conv = new MemIOUncachedTileLinkIOConverter(2)(ucWithHtifConf)
  if(lnWithHtifConf.nMasters > 1) {
    val arb = new UncachedTileLinkIOArbiter(lnWithHtifConf.nMasters)(lnWithHtifConf)
    arb.io.in zip masterEndpoints.map(_.io.master) map { case (arb, cache) => arb <> cache }
    conv.io.uncached <> arb.io.out
  } else {
    conv.io.uncached <> masterEndpoints.head.io.master
  }
  llc.io.cpu.req_cmd <> Queue(conv.io.mem.req_cmd)
  llc.io.cpu.req_data <> Queue(conv.io.mem.req_data, REFILL_CYCLES)
  conv.io.mem.resp <> llc.io.cpu.resp

  // mux between main and backup memory ports
  val mem_cmdq = (new Queue(2)) { new MemReqCmd }
  mem_cmdq.io.enq <> llc.io.mem.req_cmd
  mem_cmdq.io.deq.ready := Mux(io.mem_backup_en, mem_serdes.io.wide.req_cmd.ready, io.mem.req_cmd.ready)
  io.mem.req_cmd.valid := mem_cmdq.io.deq.valid && !io.mem_backup_en
  io.mem.req_cmd.bits := mem_cmdq.io.deq.bits
  mem_serdes.io.wide.req_cmd.valid := mem_cmdq.io.deq.valid && io.mem_backup_en
  mem_serdes.io.wide.req_cmd.bits := mem_cmdq.io.deq.bits

  val mem_dataq = (new Queue(REFILL_CYCLES)) { new MemData }
  mem_dataq.io.enq <> llc.io.mem.req_data
  mem_dataq.io.deq.ready := Mux(io.mem_backup_en, mem_serdes.io.wide.req_data.ready, io.mem.req_data.ready)
  io.mem.req_data.valid := mem_dataq.io.deq.valid && !io.mem_backup_en
  io.mem.req_data.bits := mem_dataq.io.deq.bits
  mem_serdes.io.wide.req_data.valid := mem_dataq.io.deq.valid && io.mem_backup_en
  mem_serdes.io.wide.req_data.bits := mem_dataq.io.deq.bits

  llc.io.mem.resp.valid := Mux(io.mem_backup_en, mem_serdes.io.wide.resp.valid, io.mem.resp.valid)
  io.mem.resp.ready := Bool(true)
  llc.io.mem.resp.bits := Mux(io.mem_backup_en, mem_serdes.io.wide.resp.bits, io.mem.resp.bits)

  io.mem_backup <> mem_serdes.io.narrow
}

class Uncore(htif_width: Int, tileList: Seq[ClientCoherenceAgent])(implicit conf: UncoreConfiguration) extends Component
{
  implicit val lnconf = conf.ln
  val io = new Bundle {
    val debug = new DebugIO()
    val host = new HostIO(htif_width)
    val mem_backup = new ioMemSerialized(htif_width)
    val mem_backup_en = Bool(INPUT)
    val mem = new ioMem
    val tiles = Vec(conf.ln.nClients) { new TileLinkIO }.flip
    val htif = Vec(conf.ln.nClients) { new HTIFIO(conf.ln.nClients) }.flip
    val incoherent = Vec(conf.ln.nClients) { Bool() }.asInput
  }
  val nBanks = 1
  val bankIdLsb = 5

  val htif = new rocketHTIF(htif_width)
  val outmemsys = new OuterMemorySystem(htif_width, tileList :+ htif)
  htif.io.cpu <> io.htif
  outmemsys.io.incoherent <> io.incoherent
  io.mem <> outmemsys.io.mem
  outmemsys.io.mem_backup_en <> io.mem_backup_en

  // Add networking headers and endpoint queues
  (outmemsys.io.tiles :+ outmemsys.io.htif).zip(io.tiles :+ htif.io.mem).zipWithIndex.map { 
    case ((outer, client), i) => 
      val (acq_w_header, acq_data_w_header) = TileLinkHeaderAppender(client.acquire, client.acquire_data, i, nBanks, bankIdLsb)
      outer.acquire <> acq_w_header
      outer.acquire_data <> acq_data_w_header

      val (rel_w_header, rel_data_w_header) = TileLinkHeaderAppender(client.release, client.release_data, i, nBanks, bankIdLsb)
      outer.release <> rel_w_header
      outer.release_data <> rel_data_w_header

      val grant_ack_q = Queue(client.grant_ack)
      outer.grant_ack.valid := grant_ack_q.valid
      outer.grant_ack.bits := grant_ack_q.bits
      outer.grant_ack.bits.header.src := UFix(i)
      grant_ack_q.ready := outer.grant_ack.ready

      client.grant <> Queue(outer.grant, 1, pipe = true)
      client.probe <> Queue(outer.probe)
  }

  // pad out the HTIF using a divided clock
  val hio = (new SlowIO(512)) { Bits(width = htif_width+1) }
  hio.io.set_divisor.valid := htif.io.scr.wen && htif.io.scr.waddr === 63
  hio.io.set_divisor.bits := htif.io.scr.wdata
  htif.io.scr.rdata(63) := hio.io.divisor

  hio.io.out_fast.valid := htif.io.host.out.valid || outmemsys.io.mem_backup.req.valid
  hio.io.out_fast.bits := Cat(htif.io.host.out.valid, Mux(htif.io.host.out.valid, htif.io.host.out.bits, outmemsys.io.mem_backup.req.bits))
  htif.io.host.out.ready := hio.io.out_fast.ready
  outmemsys.io.mem_backup.req.ready := hio.io.out_fast.ready && !htif.io.host.out.valid
  io.host.out.valid := hio.io.out_slow.valid && hio.io.out_slow.bits(htif_width)
  io.host.out.bits := hio.io.out_slow.bits
  io.mem_backup.req.valid := hio.io.out_slow.valid && !hio.io.out_slow.bits(htif_width)
  hio.io.out_slow.ready := Mux(hio.io.out_slow.bits(htif_width), io.host.out.ready, io.mem_backup.req.ready)

  val mem_backup_resp_valid = io.mem_backup_en && io.mem_backup.resp.valid
  hio.io.in_slow.valid := mem_backup_resp_valid || io.host.in.valid
  hio.io.in_slow.bits := Cat(mem_backup_resp_valid, io.host.in.bits)
  io.host.in.ready := hio.io.in_slow.ready
  outmemsys.io.mem_backup.resp.valid := hio.io.in_fast.valid && hio.io.in_fast.bits(htif_width)
  outmemsys.io.mem_backup.resp.bits := hio.io.in_fast.bits
  htif.io.host.in.valid := hio.io.in_fast.valid && !hio.io.in_fast.bits(htif_width)
  htif.io.host.in.bits := hio.io.in_fast.bits
  hio.io.in_fast.ready := Mux(hio.io.in_fast.bits(htif_width), Bool(true), htif.io.host.in.ready)
  io.host.clk := hio.io.clk_slow
  io.host.clk_edge := Reg(io.host.clk && !Reg(io.host.clk))
}

class TopIO(htif_width: Int) extends Bundle  {
  val debug   = new rocket.DebugIO
  val host    = new rocket.HostIO(htif_width);
  val mem_backup_en = Bool(INPUT)
  val in_mem_ready = Bool(OUTPUT)
  val in_mem_valid = Bool(INPUT)
  val out_mem_ready = Bool(INPUT)
  val out_mem_valid = Bool(OUTPUT)
  val mem     = new ioMem
}

object DummyTopLevelConstants extends _root_.uncore.constants.CoherenceConfigConstants {
  val NTILES = 1
  val NBANKS = 1
  val HTIF_WIDTH = 16
  val ENABLE_SHARING = true
  val ENABLE_CLEAN_EXCLUSIVE = true
}
import DummyTopLevelConstants._

class MemDessert extends Component {
  val io = new MemDesserIO(HTIF_WIDTH)
  val x = new MemDesser(HTIF_WIDTH)
  io.narrow <> x.io.narrow
  io.wide <> x.io.wide
}

class Top extends Component {
  val co =  if(ENABLE_SHARING) {
              if(ENABLE_CLEAN_EXCLUSIVE) new MESICoherence
              else new MSICoherence
            } else {
              if(ENABLE_CLEAN_EXCLUSIVE) new MEICoherence
              else new MICoherence
            }

  implicit val lnConf = LogicalNetworkConfiguration(NTILES+NBANKS, log2Up(NTILES)+1, NBANKS, NTILES)
  implicit val uConf = UncoreConfiguration(co, lnConf)

  val io = new TopIO(HTIF_WIDTH)

  val resetSigs = Vec(NTILES){ Bool() }
  val ic = ICacheConfig(128, 2, co, ntlb = 8, nbtb = 16)
  val dc = DCacheConfig(128, 4, co, ntlb = 8,
                        nmshr = 2, nrpq = 16, nsdq = 17)
  val rc = RocketConfiguration(lnConf, co, ic, dc,
                               fpu = true, vec = true)
  val tileList = (0 until NTILES).map(r => new Tile(resetSignal = resetSigs(r))(rc))
  val uncore = new Uncore(HTIF_WIDTH, tileList)

  var error_mode = Bool(false)
  for (i <- 0 until NTILES) {
    val hl = uncore.io.htif(i)
    val tl = uncore.io.tiles(i)
    val il = uncore.io.incoherent(i)

    resetSigs(i) := hl.reset
    val tile = tileList(i)
    tile.io.tilelink <> tl
    il := hl.reset
    tile.io.host.reset := Reg(Reg(hl.reset))
    tile.io.host.pcr_req <> Queue(hl.pcr_req)
    hl.pcr_rep <> Queue(tile.io.host.pcr_rep)
    hl.ipi_req <> Queue(tile.io.host.ipi_req)
    tile.io.host.ipi_rep <> Queue(hl.ipi_rep)
    error_mode = error_mode || Reg(tile.io.host.debug.error_mode)
  }

  io.host <> uncore.io.host

  uncore.io.mem_backup.resp.valid := io.in_mem_valid

  io.out_mem_valid := uncore.io.mem_backup.req.valid
  uncore.io.mem_backup.req.ready := io.out_mem_ready

  io.mem_backup_en <> uncore.io.mem_backup_en
  io.mem <> uncore.io.mem
  io.debug.error_mode := error_mode
}