diff --git a/include/sbi/sbi_byteorder.h b/include/sbi/sbi_byteorder.h
index 15107e1e..db6eb2b9 100644
--- a/include/sbi/sbi_byteorder.h
+++ b/include/sbi/sbi_byteorder.h
@@ -58,4 +58,14 @@
 #define le64_to_cpu(x)		((uint64_t)BSWAP64(x))
 #endif
 
+#if __riscv_xlen == 64
+#define cpu_to_lle		cpu_to_le64
+#define lle_to_cpu		le64_to_cpu
+#elif __riscv_xlen == 32
+#define cpu_to_lle		cpu_to_le32
+#define lle_to_cpu		le32_to_cpu
+#else
+#error "Unknown __riscv_xlen"
+#endif
+
 #endif /* __SBI_BYTEORDER_H__ */