arch/um/include/linux/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>

#define TIMER_MULTIPLIER 256
#define TIMER_MIN_DELTA  500

enum time_travel_mode {
	TT_MODE_OFF,
	TT_MODE_BASIC,
	TT_MODE_INFCPU,
	TT_MODE_EXTERNAL,
};

#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;
};

extern enum time_travel_mode time_travel_mode;

void time_travel_sleep(unsigned long long duration);

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);
#else
struct time_travel_event {
};

#define time_travel_mode TT_MODE_OFF

static inline void time_travel_sleep(unsigned long long duration)
{
}

/* 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)
{
}
#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__ */