From: Greentime Hu <[email protected]>
Signed-off-by: Greentime Hu <[email protected]>
Signed-off-by: Frank Chang <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
---
target/riscv/cpu_bits.h | 1 +
target/riscv/csr.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 2538580a62a..fcc8fe5cdb4 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -63,6 +63,7 @@
#define CSR_VCSR 0x00f
#define CSR_VL 0xc20
#define CSR_VTYPE 0xc21
+#define CSR_VLENB 0xc22
/* VCSR fields */
#define VCSR_VXSAT_SHIFT 0
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 4ac1ed8cfa8..7a6554447af 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -272,6 +272,12 @@ static int read_vtype(CPURISCVState *env, int csrno,
target_ulong *val)
return 0;
}
+static int read_vlenb(CPURISCVState *env, int csrno, target_ulong *val)
+{
+ *val = env_archcpu(env)->cfg.vlen >> 3;
+ return 0;
+}
+
static int read_vl(CPURISCVState *env, int csrno, target_ulong *val)
{
*val = env->vl;
@@ -1420,6 +1426,7 @@ static riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
[CSR_VCSR] = { vs, read_vcsr, write_vcsr },
[CSR_VL] = { vs, read_vl },
[CSR_VTYPE] = { vs, read_vtype },
+ [CSR_VLENB] = { vs, read_vlenb },
/* User Timers and Counters */
[CSR_CYCLE] = { ctr, read_instret },
[CSR_INSTRET] = { ctr, read_instret },
--
2.17.1
