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/*
* Kernel interface to machine-dependent clock driver.
* Garrett Wollman, September 1994.
* This file is in the public domain.
*
* $Id: clock.h,v 1.12 1996/04/22 19:40:27 nate Exp $
*/
#ifndef _MACHINE_CLOCK_H_
#define _MACHINE_CLOCK_H_
#if defined(I586_CPU) || defined(I686_CPU)
/*
* When we update the clock, we also update this bias value which is
* automatically subtracted in microtime(). We assume that CPU_THISTICKLEN()
* has been called at some point in the past, so that an appropriate value is
* set up in i586_last_tick. (This works even if we are not being called
* from hardclock because hardclock will have run before and will made the
* call.)
*/
#define CPU_CLOCKUPDATE(otime, ntime) \
do { \
if(i586_ctr_rate) { \
disable_intr(); \
i586_ctr_bias = i586_last_tick; \
*(otime) = *(ntime); \
enable_intr(); \
} else { \
*(otime) = *(ntime); \
} \
} while(0)
#define CPU_THISTICKLEN(dflt) cpu_thisticklen(dflt)
#else
#define CPU_CLOCKUPDATE(otime, ntime) \
(*(otime) = *(ntime))
#define CPU_THISTICKLEN(dflt) dflt
#endif
#define I586_CTR_RATE_SHIFT 8
#if defined(KERNEL) && !defined(LOCORE)
#include <sys/cdefs.h>
#include <machine/frame.h>
/*
* i386 to clock driver interface.
* XXX almost all of it is misplaced. i586 stuff is done in isa/clock.c
* and isa stuff is done in i386/microtime.s and i386/support.s.
*/
extern int adjkerntz;
extern int disable_rtc_set;
extern int statclock_disable;
extern int wall_cmos_clock;
#if defined(I586_CPU) || defined(I686_CPU)
extern unsigned i586_ctr_freq;
extern unsigned i586_ctr_rate; /* fixed point */
extern long long i586_last_tick;
extern long long i586_ctr_bias;
extern unsigned long i586_avg_tick;
#endif
extern int timer0_max_count;
extern u_int timer0_overflow_threshold;
extern u_int timer0_prescaler_count;
#if defined(I586_CPU) || defined(I686_CPU)
static __inline u_long
cpu_thisticklen(u_long dflt)
{
long long old;
long len;
if (i586_ctr_rate) {
old = i586_last_tick;
i586_last_tick = rdtsc();
len = ((i586_last_tick - old) << I586_CTR_RATE_SHIFT)
/ i586_ctr_rate;
i586_avg_tick = i586_avg_tick * 15 / 16 + len / 16;
}
return dflt;
}
#endif
/*
* Driver to clock driver interface.
*/
void DELAY __P((int usec));
int acquire_timer0 __P((int rate,
void (*function)(struct clockframe *frame)));
int acquire_timer2 __P((int mode));
int release_timer0 __P((void));
int release_timer2 __P((void));
int rtcin __P((int val));
int sysbeep __P((int pitch, int period));
#endif /* KERNEL && !LOCORE */
#endif /* !_MACHINE_CLOCK_H_ */
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