arch/sparc/include/asm/delay_32.h

Source file repositories/reference/linux-study-clean/arch/sparc/include/asm/delay_32.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/include/asm/delay_32.h
Extension
.h
Size
907 bytes
Lines
36
Domain
Architecture Layer
Bucket
arch/sparc
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 __SPARC_DELAY_H
#define __SPARC_DELAY_H

#include <asm/cpudata.h>

static inline void __delay(unsigned long loops)
{
	__asm__ __volatile__("cmp %0, 0\n\t"
			     "1: bne 1b\n\t"
			     "subcc %0, 1, %0\n" :
			     "=&r" (loops) :
			     "0" (loops) :
			     "cc");
}

/* This is too messy with inline asm on the Sparc. */
void __udelay(unsigned long usecs, unsigned long lpj);
void __ndelay(unsigned long nsecs, unsigned long lpj);

#ifdef CONFIG_SMP
#define __udelay_val	cpu_data(smp_processor_id()).udelay_val
#else /* SMP */
#define __udelay_val	loops_per_jiffy
#endif /* SMP */
#define udelay(__usecs)	__udelay(__usecs, __udelay_val)
#define ndelay(__nsecs)	__ndelay(__nsecs, __udelay_val)

#endif /* defined(__SPARC_DELAY_H) */

Annotation

Implementation Notes