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

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

File Facts

System
Linux kernel
Corpus path
arch/riscv/include/asm/vdso/processor.h
Extension
.h
Size
592 bytes
Lines
30
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#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 */

Annotation

Implementation Notes