Add CSRs for 3 WG extensions: Smwg, Smwgd, and Sswg.

Signed-off-by: Jim Shu <jim.shu@sifive.com>
---
 target/riscv/cpu_bits.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 74318a925c..3ea8a8e9a0 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -360,6 +360,11 @@
 #define CSR_DPC             0x7b1
 #define CSR_DSCRATCH        0x7b2
 
+/* RISC-V WorldGuard */
+#define CSR_MLWID           0x390
+#define CSR_SLWID           0x190
+#define CSR_MWIDDELEG       0x748
+
 /* Performance Counters */
 #define CSR_MHPMCOUNTER3    0xb03
 #define CSR_MHPMCOUNTER4    0xb04
-- 
2.17.1