Merge pull request #3539 from chipsalliance/rocc-csr-fence

Fence for RoCC on rocc-csr writes
chipsalliance · Feb 12, 2024 · c025c2e · c025c2e
2 parents baa9f45 + dfaa357
commit c025c2e
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/main/scala/rocket/RocketCore.scala b/src/main/scala/rocket/RocketCore.scala
@@ -349,7 +349,8 @@ class Rocket(tile: RocketTile)(implicit p: Parameters) extends CoreModule()(p)
   val id_rocc_busy = usingRoCC.B &&
     (io.rocc.busy || ex_reg_valid && ex_ctrl.rocc ||
      mem_reg_valid && mem_ctrl.rocc || wb_reg_valid && wb_ctrl.rocc)
-  val id_do_fence = WireDefault(id_rocc_busy && id_ctrl.fence ||
+  val id_csr_rocc_write = tile.roccCSRs.flatten.map(_.id.U === id_inst(0)(31,20)).orR && id_csr_en && !id_csr_ren
+  val id_do_fence = WireDefault(id_rocc_busy && (id_ctrl.fence || id_csr_rocc_write) ||
     id_mem_busy && (id_ctrl.amo && id_amo_rl || id_ctrl.fence_i || id_reg_fence && (id_ctrl.mem || id_ctrl.rocc)))
 
   val bpu = Module(new BreakpointUnit(nBreakpoints))