1
0
rocket-chip/src/main/scala/groundtest/DummyPTW.scala
Henry Cook 4c595d175c Refactor package hierarchy and remove legacy bus protocol implementations (#845)
* Refactors package hierarchy.

Additionally:
  - Removes legacy ground tests and configs
  - Removes legacy bus protocol implementations
  - Removes NTiles
  - Adds devices package
  - Adds more functions to util package
2017-07-07 10:48:16 -07:00

56 lines
1.8 KiB
Scala

// See LICENSE.SiFive for license details.
// See LICENSE.Berkeley for license details.
package freechips.rocketchip.groundtest
import Chisel._
import freechips.rocketchip.config.Parameters
import freechips.rocketchip.rocket._
import freechips.rocketchip.tile.CoreModule
import freechips.rocketchip.util.ParameterizedBundle
class DummyPTW(n: Int)(implicit p: Parameters) extends CoreModule()(p) {
val io = new Bundle {
val requestors = Vec(n, new TLBPTWIO).flip
}
val req_arb = Module(new RRArbiter(new PTWReq, n))
req_arb.io.in <> io.requestors.map(_.req)
req_arb.io.out.ready := Bool(true)
def vpn_to_ppn(vpn: UInt): UInt = vpn(ppnBits - 1, 0)
class QueueChannel extends ParameterizedBundle()(p) {
val ppn = UInt(width = ppnBits)
val chosen = UInt(width = log2Up(n))
}
val s1_ppn = vpn_to_ppn(req_arb.io.out.bits.addr)
val s2_ppn = RegEnable(s1_ppn, req_arb.io.out.valid)
val s2_chosen = RegEnable(req_arb.io.chosen, req_arb.io.out.valid)
val s2_valid = Reg(next = req_arb.io.out.valid)
val s2_resp = Wire(init = 0.U.asTypeOf(new PTWResp))
s2_resp.pte.ppn := s2_ppn
s2_resp.pte.reserved_for_software := UInt(0)
s2_resp.level := UInt(pgLevels-1)
s2_resp.pte.d := Bool(true)
s2_resp.pte.a := Bool(true)
s2_resp.pte.g := Bool(false)
s2_resp.pte.u := Bool(true)
s2_resp.pte.r := Bool(true)
s2_resp.pte.w := Bool(true)
s2_resp.pte.x := Bool(false)
s2_resp.pte.v := Bool(true)
io.requestors.zipWithIndex.foreach { case (requestor, i) =>
requestor.resp.valid := s2_valid && s2_chosen === UInt(i)
requestor.resp.bits := s2_resp
requestor.status := 0.U.asTypeOf(requestor.status)
requestor.ptbr.mode := requestor.ptbr.pgLevelsToMode(pgLevels).U
requestor.ptbr.asid := UInt(0)
requestor.ptbr.ppn := UInt(0)
}
}