1/*
2** Copyright 2003-2004, Axel D��rfler, 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
13extern "C" {
14#endif
15
16struct 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 */
30struct 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
38typedef struct timer_info timer_info;
39
40
41/* kernel functions */
42status_t timer_init(struct kernel_args *);
43void timer_init_post_rtc(void);
44void timer_real_time_clock_changed();
45int32 timer_interrupt(void);
46
47#ifdef __cplusplus
48}
49#endif
50
51#endif	/* _KERNEL_TIMER_H */
52