Bru: add BRUOpType to package.scala

src/main/scala/xiangshan/backend/package.scala

@@ -5,24 +5,38 @@ import chisel3.util._
 
 package object backend {
 
-  // jal csr mov
+  // jal csr move(x2f) mou
   object BRUOpType {
-    // 1. jal
-    def jal  = "b011000".U
-    def jalr = "b011010".U
-    // def cjalr= "b111010".U // pc + 2 instead of 4
-
-    // 2. csr
-    def jmp  = "b000".U
-    def wrt  = "b001".U
-    def set  = "b010".U
-    def clr  = "b011".U
-    def wrti = "b101".U
-    def seti = "b110".U
-    def clri = "b111".U
-
-    // todo: 3. mov
-//    def pcPlus2(func: UInt) = func(5)//[important]
+    // [2bit:Type]: 00:csr 01:move(x2f) mou(fence.i,etc) jump
+    // 0. csr
+    def jmp  = "b00_000".U
+    def wrt  = "b00_001".U
+    def set  = "b00_010".U
+    def clr  = "b00_011".U
+    def wrti = "b00_101".U
+    def seti = "b00_110".U
+    def clri = "b00_111".U
+    
+    // 1. move(x2f)
+    // FIXME: temp decode, should be fixed when use it
+    def fmv_w_x = "b01_000".U
+    def fmv_d_x = "b01_001".U
+
+    // 2. mou
+    def fence  = "b01_000".U
+    def fencei = "b01_001".U
+    def sfence_vma = "b01_010".U
+
+    // 3. jal
+    def jal  = "b11_000".U
+    def jalr = "b11_010".U
+    def call = "b11_011".U
+    def ret  = "b11_100".U
+
+    def isCSR(func: UInt) = func(4,3)===0.U
+    def isFMV(func: UInt) = func(4,3)===1.U
+    def isMOU(func: UInt) = func(4,3)===2.U // TODO: change its name
+    def isJUMP(func: UInt) = func(4,3)===3.U
   }