arch/um/include/linux/time-internal.h

   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
  14 enum 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
  22 struct 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
  29 extern enum time_travel_mode time_travel_mode;
  30
  31 void time_travel_sleep(unsigned long long duration);
  32
  33 static inline void
  34 time_travel_set_event_fn(struct time_travel_event *e,
  35                          void (*fn)(struct time_travel_event *d))
  36 {
  37         e->fn = fn;
  38 }
  39
  40 void __time_travel_propagate_time(void);
  41
  42 static inline void time_travel_propagate_time(void)
  43 {
  44         if (time_travel_mode == TT_MODE_EXTERNAL)
  45                 __time_travel_propagate_time();
  46 }
  47
  48 void __time_travel_wait_readable(int fd);
  49
  50 static 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
  56 void time_travel_add_irq_event(struct time_travel_event *e);
  57 #else
  58 struct time_travel_event {
  59 };
  60
  61 #define time_travel_mode TT_MODE_OFF
  62
  63 static 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
  70 static inline void time_travel_propagate_time(void)
  71 {
  72 }
  73
  74 static 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  */
  83 void time_travel_ndelay(unsigned long nsec);
  84 #endif /* __TIMER_INTERNAL_H__ */