044e1e6296
Highlights:
* Simple model for underlying hardware.
* Hardware basis for timekeeping can be changed on the fly.
* Only one hardware clock responsible for TOD keeping.
* Provides a real nanotime() function.
* Time granularity: .232E-18 seconds.
* Frequency granularity: .238E-12 s/s
* Frequency adjustment is continuous in time.
* Less overhead for frequency adjustment.
* Improves xntpd performance.
Reviewed by: bde, bde, bde
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/*
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* Kernel interface to machine-dependent clock driver.
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* Garrett Wollman, September 1994.
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* This file is in the public domain.
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*
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* $Id: clock.h,v 1.31 1998/02/01 22:45:23 bde Exp $
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*/
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#ifndef _MACHINE_CLOCK_H_
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#define _MACHINE_CLOCK_H_
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#define TSC_COMULTIPLIER_SHIFT 20
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#define TSC_MULTIPLIER_SHIFT 32
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#ifdef KERNEL
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/*
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* i386 to clock driver interface.
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* XXX almost all of it is misplaced. i586 stuff is done in isa/clock.c
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* and isa stuff is done in i386/microtime.s and i386/support.s.
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*/
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extern int adjkerntz;
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extern int disable_rtc_set;
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extern int statclock_disable;
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extern u_int timer_freq;
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extern int timer0_max_count;
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extern u_int tsc_freq;
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extern int wall_cmos_clock;
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/*
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* Driver to clock driver interface.
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*/
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struct clockframe;
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void DELAY __P((int usec));
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int acquire_timer0 __P((int rate,
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void (*function)(struct clockframe *frame)));
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int acquire_timer2 __P((int mode));
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int release_timer0 __P((void));
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int release_timer2 __P((void));
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#ifndef PC98
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int rtcin __P((int val));
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#else
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int acquire_timer1 __P((int mode));
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int release_timer1 __P((void));
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#endif
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int sysbeep __P((int pitch, int period));
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#endif /* KERNEL */
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#endif /* !_MACHINE_CLOCK_H_ */
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