xref: /XiangShan/src/main/scala/xiangshan/backend/datapath/WbConfig.scala (revision 0655b1a089e26f9da6733eead6ccffb30da84aca) 
1package xiangshan.backend.datapath
2
3import chisel3.util.log2Up
4import xiangshan.backend.datapath.DataConfig._
5
6object WbConfig {
7  sealed abstract class WbConfig() {
8    val port: Int
9    def dataCfg: DataConfig
10    def numPreg: Int = 0
11    def dataWidth: Int = dataCfg.dataWidth
12
13    def pregIdxWidth = log2Up(numPreg)
14
15    def writeInt = dataCfg == IntData()
16    def writeFp = dataCfg == FpData()
17    def writeVec = dataCfg == VecData()
18
19    override def toString: String = {
20      var res = dataCfg match {
21        case IntData() => "I"
22        case FpData() => "F"
23        case VecData() => "V"
24        case _ => "?"
25      }
26      res += s"($port)"
27      res
28    }
29  }
30
31  sealed abstract class ExuWB extends WbConfig
32
33  sealed abstract class PregWB extends ExuWB {
34    val priority: Int
35  }
36
37  case class IntWB(
38    port    : Int = -1,
39    priority: Int = Int.MaxValue,
40  ) extends PregWB {
41    def dataCfg: DataConfig = IntData()
42    override def numPreg: Int = 160
43  }
44
45  case class VfWB(
46    port    : Int = -1,
47    priority: Int = Int.MaxValue,
48  ) extends PregWB {
49    def dataCfg: DataConfig = VecData()
50    override def numPreg: Int = 160
51  }
52
53  case class VecWB(
54    port: Int = -1,
55    priority: Int = Int.MaxValue,
56  ) extends PregWB {
57    def dataCfg: DataConfig = VecData()
58
59    override def numPreg: Int = 160
60  }
61
62  case class CtrlWB(
63    port: Int = -1,
64  ) extends WbConfig {
65    val priority: Int = Int.MaxValue
66    override def dataCfg: DataConfig = NoData()
67  }
68
69  // Todo: use it
70  sealed trait WBSource
71  case class WBFromInt() extends WBSource
72  case class WBFromMem() extends WBSource
73  case class WBFromVec() extends WBSource
74  case class WBFromFp()  extends WBSource
75}
76
77