tools/arch/riscv/include/asm/vdso/processor.h

Source file repositories/reference/linux-study-clean/tools/arch/riscv/include/asm/vdso/processor.h

File Facts

System
Linux kernel
Corpus path
tools/arch/riscv/include/asm/vdso/processor.h
Extension
.h
Size
696 bytes
Lines
33
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __ASM_VDSO_PROCESSOR_H
#define __ASM_VDSO_PROCESSOR_H

#ifndef __ASSEMBLER__

#include <asm-generic/barrier.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

#ifdef CONFIG_TOOLCHAIN_HAS_ZIHINTPAUSE
	/*
	 * Reduce instruction retirement.
	 * This assumes the PC changes.
	 */
	__asm__ __volatile__ ("pause");
#else
	/* Encoding of the pause instruction */
	__asm__ __volatile__ (".4byte 0x100000F");
#endif
	barrier();
}

#endif /* __ASSEMBLER__ */

#endif /* __ASM_VDSO_PROCESSOR_H */

Annotation

Implementation Notes