package lib

import chisel3._
trait param {
  val BTB_ADDR_HI      = 9
  val BTB_ADDR_LO      = 2
  val BTB_BTAG_SIZE    = 5
  val BTB_INDEX1_HI    = 9
  val BTB_INDEX1_LO    = 2
  val BTB_INDEX2_HI    = 17
  val BTB_INDEX2_LO    = 10
  val BTB_INDEX3_HI    = 25
  val BTB_INDEX3_LO    = 18
}

trait el2_lib extends param{
  def el2_btb_tag_hash(pc : UInt) =
    (VecInit.tabulate(3)(i => pc(BTB_ADDR_HI+((i+1)*(BTB_BTAG_SIZE)),BTB_ADDR_HI+(i*BTB_BTAG_SIZE)+1))).reduce(_^_)

  def el2_btb_tag_hash_fold(pc : UInt) =
    pc(BTB_ADDR_HI+(2*BTB_BTAG_SIZE),BTB_ADDR_HI+BTB_BTAG_SIZE+1)^pc(BTB_ADDR_HI+BTB_BTAG_SIZE,BTB_ADDR_HI+1)

  def el2_btb_addr_hash(pc : UInt) : UInt = 0.U
  //  def el2_btb_ghr_hash
}