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
10 static 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 */
29
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