arch/mips/include/asm/time.h

Source file repositories/reference/linux-study-clean/arch/mips/include/asm/time.h

File Facts

System
Linux kernel
Corpus path
arch/mips/include/asm/time.h
Extension
.h
Size
1624 bytes
Lines
74
Domain
Architecture Layer
Bucket
arch/mips
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_TIME_H
#define _ASM_TIME_H

#include <linux/rtc.h>
#include <linux/spinlock.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>

extern spinlock_t rtc_lock;

/*
 * board specific routines required by time_init().
 */
extern void plat_time_init(void);

/*
 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible
 * counter as a timer interrupt source.
 */
extern unsigned int mips_hpt_frequency;

/*
 * The performance counter IRQ on MIPS is a close relative to the timer IRQ
 * so it lives here.
 */
extern int (*perf_irq)(void);
extern int __weak get_c0_perfcount_int(void);

/*
 * Initialize the calling CPU's compare interrupt as clockevent device
 */
extern unsigned int get_c0_compare_int(void);
extern int r4k_clockevent_init(void);

static inline int mips_clockevent_init(void)
{
#ifdef CONFIG_CEVT_R4K
	return r4k_clockevent_init();
#else
	return -ENXIO;
#endif
}

/*
 * Initialize the count register as a clocksource
 */
extern int init_r4k_clocksource(void);

static inline __init int init_mips_clocksource(void)
{
#ifdef CONFIG_CSRC_R4K
	return init_r4k_clocksource();
#else
	return 0;
#endif
}

static inline void clockevent_set_clock(struct clock_event_device *cd,
					unsigned int clock)
{
	clockevents_calc_mult_shift(cd, clock, 4);
}

#endif /* _ASM_TIME_H */

Annotation

Implementation Notes