1 files changed, 29 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/vdso/processor.h b/arch/riscv/include/asm/vdso/processor.h
new file mode 100644
index 000000000000..c42f95dc8811
--- /dev/null
+++ b/arch/riscv/include/asm/vdso/processor.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_VDSO_PROCESSOR_H
+#define __ASM_VDSO_PROCESSOR_H
+
+#ifndef __ASSEMBLER__
+
+#include <asm/barrier.h>
+#include <asm/errata_list.h>
+#include <asm/insn-def.h>
+
+static inline void cpu_relax(void)
+{
+#ifdef __riscv_muldiv
+	int dummy;
+	/* In lieu of a halt instruction, induce a long-latency stall. */
+	__asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
+#endif
+
+	/*
+	 * Reduce instruction retirement.
+	 * This assumes the PC changes.
+	 */
+	ALT_RISCV_PAUSE();
+	barrier();
+}
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* __ASM_VDSO_PROCESSOR_H */