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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2012 - 2014 Cisco Systems
4 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
5 */
6
7#ifndef __TIMER_INTERNAL_H__
8#define __TIMER_INTERNAL_H__
9#include <linux/list.h>
10
11#define TIMER_MULTIPLIER 256
12#define TIMER_MIN_DELTA 500
13
14enum time_travel_mode {
15 TT_MODE_OFF,
16 TT_MODE_BASIC,
17 TT_MODE_INFCPU,
18 TT_MODE_EXTERNAL,
19};
20
21#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
22struct time_travel_event {
23 unsigned long long time;
24 void (*fn)(struct time_travel_event *d);
25 struct list_head list;
26 bool pending, onstack;
27};
28
29extern enum time_travel_mode time_travel_mode;
30
31void time_travel_sleep(unsigned long long duration);
32
33static inline void
34time_travel_set_event_fn(struct time_travel_event *e,
35 void (*fn)(struct time_travel_event *d))
36{
37 e->fn = fn;
38}
39
40void __time_travel_propagate_time(void);
41
42static inline void time_travel_propagate_time(void)
43{
44 if (time_travel_mode == TT_MODE_EXTERNAL)
45 __time_travel_propagate_time();
46}
47
48void __time_travel_wait_readable(int fd);
49
50static inline void time_travel_wait_readable(int fd)
51{
52 if (time_travel_mode == TT_MODE_EXTERNAL)
53 __time_travel_wait_readable(fd);
54}
55
56void time_travel_add_irq_event(struct time_travel_event *e);
57#else
58struct time_travel_event {
59};
60
61#define time_travel_mode TT_MODE_OFF
62
63static inline void time_travel_sleep(unsigned long long duration)
64{
65}
66
67/* this is a macro so the event/function need not exist */
68#define time_travel_set_event_fn(e, fn) do {} while (0)
69
70static inline void time_travel_propagate_time(void)
71{
72}
73
74static inline void time_travel_wait_readable(int fd)
75{
76}
77#endif /* CONFIG_UML_TIME_TRAVEL_SUPPORT */
78
79/*
80 * Without CONFIG_UML_TIME_TRAVEL_SUPPORT this is a linker error if used,
81 * which is intentional since we really shouldn't link it in that case.
82 */
83void time_travel_ndelay(unsigned long nsec);
84#endif /* __TIMER_INTERNAL_H__ */