freebsd-src/sys/amd64/include/clock.h
Jung-uk Kim 29462bea1e Turn off CPU frequency change notifiers when the TSC is P-state invariant
or it is forced by setting 'kern.timecounter.invariant_tsc' tunable
to non-zero.
2008-10-21 00:38:00 +00:00

43 lines
838 B
C

/*-
* Kernel interface to machine-dependent clock driver.
* Garrett Wollman, September 1994.
* This file is in the public domain.
*
* $FreeBSD$
*/
#ifndef _MACHINE_CLOCK_H_
#define _MACHINE_CLOCK_H_
#ifdef _KERNEL
/*
* i386 to clock driver interface.
* XXX large parts of the driver and its interface are misplaced.
*/
extern int clkintr_pending;
extern int statclock_disable;
extern u_int i8254_freq;
extern int i8254_max_count;
extern uint64_t tsc_freq;
extern int tsc_is_broken;
extern int tsc_is_invariant;
void i8254_init(void);
/*
* Driver to clock driver interface.
*/
void startrtclock(void);
void init_TSC(void);
void init_TSC_tc(void);
#define HAS_TIMER_SPKR 1
int timer_spkr_acquire(void);
int timer_spkr_release(void);
void timer_spkr_setfreq(int freq);
#endif /* _KERNEL */
#endif /* !_MACHINE_CLOCK_H_ */