clock.h revision 18992
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 1.18 1996/10/10 10:25:26 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; 55#if defined(I586_CPU) || defined(I686_CPU) 56extern u_int i586_ctr_bias; 57extern u_int i586_ctr_comultiplier; 58extern u_int i586_ctr_freq; 59extern u_int i586_ctr_multiplier; 60extern long long i586_last_tick; 61extern unsigned long i586_avg_tick; 62#endif 63extern int statclock_disable; 64extern u_int timer_freq; 65extern int timer0_max_count; 66extern u_int timer0_overflow_threshold; 67extern u_int timer0_prescaler_count; 68extern int wall_cmos_clock; 69 70#if defined(I586_CPU) || defined(I686_CPU) 71static __inline u_long 72cpu_thisticklen(u_long dflt) 73{ 74 long long old; 75 long len; 76 77 if (i586_ctr_freq != 0) { 78 old = i586_last_tick; 79 i586_last_tick = rdtsc(); 80 len = ((i586_last_tick - old) * i586_ctr_multiplier) 81 >> I586_CTR_MULTIPLIER_SHIFT; 82 i586_avg_tick = i586_avg_tick * 15 / 16 + len / 16; 83 } 84 return dflt; 85} 86#endif 87 88/* 89 * Driver to clock driver interface. 90 */ 91void DELAY __P((int usec)); 92int acquire_timer0 __P((int rate, 93 void (*function)(struct clockframe *frame))); 94int acquire_timer2 __P((int mode)); 95int release_timer0 __P((void)); 96int release_timer2 __P((void)); 97#ifndef PC98 98int rtcin __P((int val)); 99#else 100int acquire_timer1 __P((int mode)); 101int release_timer1 __P((void)); 102void rtc_serialcombit __P((int i)); 103void rtc_serialcom __P((int i)); 104void rtc_outb __P((int val)); 105#endif 106int sysbeep __P((int pitch, int period)); 107 108#endif /* KERNEL && !LOCORE */ 109 110#endif /* !_MACHINE_CLOCK_H_ */ 111