diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S
index f55b8cbc37..5ac899b141 100644
--- a/arch/riscv/cpu/start.S
+++ b/arch/riscv/cpu/start.S
@@ -36,6 +36,10 @@
 .section .text
 .globl _start
 _start:
+#ifdef CONFIG_RISCV_MMODE
+	csrr	a0, mhartid
+#endif
+
 	/* save hart id and dtb pointer */
 	mv	tp, a0
 	mv	s1, a1