84369dd523
This lets us use the TSC to implement early DELAY, limiting the use of the sometimes-unreliable 8254 PIT. PR: 262155 Reviewed by: emaste Tested by: emaste, mike tancsa <mike@sentex.net>, Stefan Hegnauer <stefan.hegnauer@gmx.ch> MFC after: 1 month Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D34367
50 lines
967 B
C
50 lines
967 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 u_int i8254_freq;
|
|
extern int i8254_max_count;
|
|
extern uint64_t tsc_freq;
|
|
extern int tsc_is_invariant;
|
|
extern int tsc_perf_stat;
|
|
#ifdef SMP
|
|
extern int smp_tsc;
|
|
#endif
|
|
|
|
void i8254_init(void);
|
|
void i8254_delay(int);
|
|
void clock_init(void);
|
|
void lapic_calibrate(void);
|
|
void tsc_init(void);
|
|
void tsc_calibrate(void);
|
|
|
|
/*
|
|
* Driver to clock driver interface.
|
|
*/
|
|
|
|
void startrtclock(void);
|
|
void start_TSC(void);
|
|
void resume_TSC(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_ */
|