clock.h revision 249324 
1/*-
2 * Kernel interface to machine-dependent clock driver.
3 * Garrett Wollman, September 1994.
4 * This file is in the public domain.
5 *
6 * $FreeBSD: head/sys/amd64/include/clock.h 249324 2013-04-10 05:59:07Z neel $
7 */
8
9#ifndef _MACHINE_CLOCK_H_
10#define	_MACHINE_CLOCK_H_
11
12#ifdef _KERNEL
13/*
14 * i386 to clock driver interface.
15 * XXX large parts of the driver and its interface are misplaced.
16 */
17extern int	clkintr_pending;
18extern u_int	i8254_freq;
19extern int	i8254_max_count;
20extern uint64_t	tsc_freq;
21extern int	tsc_is_invariant;
22extern int	tsc_perf_stat;
23#ifdef SMP
24extern int	smp_tsc;
25#endif
26
27void	i8254_init(void);
28
29/*
30 * Driver to clock driver interface.
31 */
32
33void	startrtclock(void);
34void	init_TSC(void);
35
36#define	HAS_TIMER_SPKR 1
37int	timer_spkr_acquire(void);
38int	timer_spkr_release(void);
39void	timer_spkr_setfreq(int freq);
40
41#endif /* _KERNEL */
42
43#endif /* !_MACHINE_CLOCK_H_ */
44