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 #include <asm/bug.h>
  11 #include <shared/timetravel.h>
  12
  13 #define TIMER_MULTIPLIER 256
  14 #define TIMER_MIN_DELTA  500
  15
  16 #ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
  17 struct time_travel_event {
  18         unsigned long long time;
  19         void (*fn)(struct time_travel_event *d);
  20         struct list_head list;
  21         bool pending, onstack;
  22 };
  23
  24 void time_travel_sleep(void);
  25
  26 static inline void
  27 time_travel_set_event_fn(struct time_travel_event *e,
  28                          void (*fn)(struct time_travel_event *d))
  29 {
  30         e->fn = fn;
  31 }
  32
  33 void __time_travel_propagate_time(void);
  34
  35 static inline void time_travel_propagate_time(void)
  36 {
  37         if (time_travel_mode == TT_MODE_EXTERNAL)
  38                 __time_travel_propagate_time();
  39 }
  40
  41 void __time_travel_wait_readable(int fd);
  42
  43 static inline void time_travel_wait_readable(int fd)
  44 {
  45         if (time_travel_mode == TT_MODE_EXTERNAL)
  46                 __time_travel_wait_readable(fd);
  47 }
  48
  49 void time_travel_add_irq_event(struct time_travel_event *e);
  50 void time_travel_add_event_rel(struct time_travel_event *e,
  51                                unsigned long long delay_ns);
  52 bool time_travel_del_event(struct time_travel_event *e);
  53 #else
  54 struct time_travel_event {
  55 };
  56
  57 static inline void time_travel_sleep(void)
  58 {
  59 }
  60
  61 /* this is a macro so the event/function need not exist */
  62 #define time_travel_set_event_fn(e, fn) do {} while (0)
  63
  64 static inline void time_travel_propagate_time(void)
  65 {
  66 }
  67
  68 static inline void time_travel_wait_readable(int fd)
  69 {
  70 }
  71
  72 static inline void time_travel_add_irq_event(struct time_travel_event *e)
  73 {
  74         WARN_ON(1);
  75 }
  76
  77 /*
  78  * not inlines so the data structure need not exist,
  79  * cause linker failures
  80  */
  81 extern void time_travel_not_configured(void);
  82 #define time_travel_add_event_rel(...) time_travel_not_configured()
  83 #define time_travel_del_event(...) time_travel_not_configured()
  84 #endif /* CONFIG_UML_TIME_TRAVEL_SUPPORT */
  85
  86 /*
  87  * Without CONFIG_UML_TIME_TRAVEL_SUPPORT this is a linker error if used,
  88  * which is intentional since we really shouldn't link it in that case.
  89  */
  90 void time_travel_ndelay(unsigned long nsec);
  91 #endif /* __TIMER_INTERNAL_H__ */