clock.h revision 17394
1/* 2 * Kernel interface to machine-dependent clock driver. 3 * Garrett Wollman, September 1994. 4 * This file is in the public domain. 5 * 6 * $Id: clock.h,v 1.15 1996/07/30 19:26:55 bde Exp $ 7 */ 8 9#ifndef _MACHINE_CLOCK_H_ 10#define _MACHINE_CLOCK_H_ 11 12#if defined(I586_CPU) || defined(I686_CPU) 13 14/* 15 * When we update the clock, we also update this bias value which is 16 * automatically subtracted in microtime(). We assume that CPU_THISTICKLEN() 17 * has been called at some point in the past, so that an appropriate value is 18 * set up in i586_last_tick. (This works even if we are not being called 19 * from hardclock because hardclock will have run before and will made the 20 * call.) 21 */ 22#define CPU_CLOCKUPDATE(otime, ntime) \ 23 do { \ 24 if (i586_ctr_freq != 0) { \ 25 disable_intr(); \ 26 i586_ctr_bias = i586_last_tick; \ 27 *(otime) = *(ntime); \ 28 enable_intr(); \ 29 } else { \ 30 *(otime) = *(ntime); \ 31 } \ 32 } while(0) 33 34#define CPU_THISTICKLEN(dflt) cpu_thisticklen(dflt) 35#else 36#define CPU_CLOCKUPDATE(otime, ntime) \ 37 (*(otime) = *(ntime)) 38#define CPU_THISTICKLEN(dflt) dflt 39#endif 40 41#define I586_CTR_COMULTIPLIER_SHIFT 20 42#define I586_CTR_MULTIPLIER_SHIFT 32 43 44#if defined(KERNEL) && !defined(LOCORE) 45#include <sys/cdefs.h> 46#include <machine/frame.h> 47 48/* 49 * i386 to clock driver interface. 50 * XXX almost all of it is misplaced. i586 stuff is done in isa/clock.c 51 * and isa stuff is done in i386/microtime.s and i386/support.s. 52 */ 53extern int adjkerntz; 54extern int disable_rtc_set; 55extern int statclock_disable; 56extern int wall_cmos_clock; 57 58#if defined(I586_CPU) || defined(I686_CPU) 59extern u_int i586_ctr_bias; 60extern u_int i586_ctr_comultiplier; 61extern u_int i586_ctr_freq; 62extern u_int i586_ctr_multiplier; 63extern long long i586_last_tick; 64extern unsigned long i586_avg_tick; 65#endif 66extern int timer0_max_count; 67extern u_int timer0_overflow_threshold; 68extern u_int timer0_prescaler_count; 69 70 71#if defined(I586_CPU) || defined(I686_CPU) 72static __inline u_long 73cpu_thisticklen(u_long dflt) 74{ 75 long long old; 76 long len; 77 78 if (i586_ctr_freq != 0) { 79 old = i586_last_tick; 80 i586_last_tick = rdtsc(); 81 len = ((i586_last_tick - old) * i586_ctr_multiplier) 82 >> I586_CTR_MULTIPLIER_SHIFT; 83 i586_avg_tick = i586_avg_tick * 15 / 16 + len / 16; 84 } 85 return dflt; 86} 87#endif 88 89/* 90 * Driver to clock driver interface. 91 */ 92void DELAY __P((int usec)); 93int acquire_timer0 __P((int rate, 94 void (*function)(struct clockframe *frame))); 95int acquire_timer2 __P((int mode)); 96int release_timer0 __P((void)); 97int release_timer2 __P((void)); 98#ifndef PC98 99int rtcin __P((int val)); 100#else 101int acquire_timer1 __P((int mode)); 102int release_timer1 __P((void)); 103void rtc_serialcombit __P((int i)); 104void rtc_serialcom __P((int i)); 105void rtc_outb __P((int val)); 106#endif 107int sysbeep __P((int pitch, int period)); 108 109#endif /* KERNEL && !LOCORE */ 110 111#endif /* !_MACHINE_CLOCK_H_ */ 112