headers/private/kernel/timer.h

   1 /*
   2 ** Copyright 2003-2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3 ** Distributed under the terms of the MIT License.
   4 */
   5 #ifndef _KERNEL_TIMER_H
   6 #define _KERNEL_TIMER_H
   7
   8
   9 #include <KernelExport.h>
  10
  11
  12 #ifdef __cplusplus
  13 extern "C" {
  14 #endif
  15
  16 struct kernel_args;
  17
  18 #define B_TIMER_REAL_TIME_BASE                  0x2000
  19         // For an absolute timer the given time is interpreted as a real-time, not
  20         // as a system time. Note that setting the real-time clock will cause the
  21         // timer to be updated -- it will expire according to the new clock.
  22         // Relative timers are unaffected by this flag.
  23 #define B_TIMER_USE_TIMER_STRUCT_TIMES  0x4000
  24         // For add_timer(): Use the timer::schedule_time (absolute time) and
  25         // timer::period values instead of the period parameter.
  26 #define B_TIMER_FLAGS   \
  27         (B_TIMER_USE_TIMER_STRUCT_TIMES | B_TIMER_REAL_TIME_BASE)
  28
  29 /* Timer info structure */
  30 struct timer_info {
  31         const char *name;
  32         int (*get_priority)(void);
  33         status_t (*set_hardware_timer)(bigtime_t timeout);
  34         status_t (*clear_hardware_timer)(void);
  35         status_t (*init)(struct kernel_args *args);
  36 };
  37
  38 typedef struct timer_info timer_info;
  39
  40
  41 /* kernel functions */
  42 status_t timer_init(struct kernel_args *);
  43 void timer_init_post_rtc(void);
  44 void timer_real_time_clock_changed();
  45 int32 timer_interrupt(void);
  46
  47 #ifdef __cplusplus
  48 }
  49 #endif
  50
  51 #endif  /* _KERNEL_TIMER_H */