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name : time-internal.h
 /* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2012 - 2014 Cisco Systems
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 */

#ifndef __TIMER_INTERNAL_H__
#define __TIMER_INTERNAL_H__
#include <linux/list.h>
#include <asm/bug.h>
#include <shared/timetravel.h>

#define TIMER_MULTIPLIER 256
#define TIMER_MIN_DELTA  500

#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
struct time_travel_event {
	unsigned long long time;
	void (*fn)(struct time_travel_event *d);
	struct list_head list;
	bool pending, onstack;
};

void time_travel_sleep(void);

static inline void
time_travel_set_event_fn(struct time_travel_event *e,
			 void (*fn)(struct time_travel_event *d))
{
	e->fn = fn;
}

void __time_travel_propagate_time(void);

static inline void time_travel_propagate_time(void)
{
	if (time_travel_mode == TT_MODE_EXTERNAL)
		__time_travel_propagate_time();
}

void __time_travel_wait_readable(int fd);

static inline void time_travel_wait_readable(int fd)
{
	if (time_travel_mode == TT_MODE_EXTERNAL)
		__time_travel_wait_readable(fd);
}

void time_travel_add_irq_event(struct time_travel_event *e);
void time_travel_add_event_rel(struct time_travel_event *e,
			       unsigned long long delay_ns);
bool time_travel_del_event(struct time_travel_event *e);
#else
struct time_travel_event {
};

static inline void time_travel_sleep(void)
{
}

/* this is a macro so the event/function need not exist */
#define time_travel_set_event_fn(e, fn) do {} while (0)

static inline void time_travel_propagate_time(void)
{
}

static inline void time_travel_wait_readable(int fd)
{
}

static inline void time_travel_add_irq_event(struct time_travel_event *e)
{
	WARN_ON(1);
}

/*
 * not inlines so the data structure need not exist,
 * cause linker failures
 */
extern void time_travel_not_configured(void);
#define time_travel_add_event_rel(...) time_travel_not_configured()
#define time_travel_del_event(...) time_travel_not_configured()
#endif /* CONFIG_UML_TIME_TRAVEL_SUPPORT */

/*
 * Without CONFIG_UML_TIME_TRAVEL_SUPPORT this is a linker error if used,
 * which is intentional since we really shouldn't link it in that case.
 */
void time_travel_ndelay(unsigned long nsec);
#endif /* __TIMER_INTERNAL_H__ */
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