Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2#ifndef __ASM_VDSO_PROCESSOR_H
3#define __ASM_VDSO_PROCESSOR_H
4
5#ifndef __ASSEMBLY__
6
7#include <asm/barrier.h>
8#include <asm/insn-def.h>
9
10static inline void cpu_relax(void)
11{
12#ifdef __riscv_muldiv
13 int dummy;
14 /* In lieu of a halt instruction, induce a long-latency stall. */
15 __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
16#endif
17
18 /*
19 * Reduce instruction retirement.
20 * This assumes the PC changes.
21 */
22 __asm__ __volatile__ (RISCV_PAUSE);
23 barrier();
24}
25
26#endif /* __ASSEMBLY__ */
27
28#endif /* __ASM_VDSO_PROCESSOR_H */