clock.h revision 17353
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 1.14 1996/06/14 11:00:56 asami 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_rate) { \ 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#define I586_CTR_RATE_SHIFT 8 44 45#if defined(KERNEL) && !defined(LOCORE) 46#include <sys/cdefs.h> 47#include <machine/frame.h> 48 49/* 50 * i386 to clock driver interface. 51 * XXX almost all of it is misplaced. i586 stuff is done in isa/clock.c 52 * and isa stuff is done in i386/microtime.s and i386/support.s. 53 */ 54extern int adjkerntz; 55extern int disable_rtc_set; 56extern int statclock_disable; 57extern int wall_cmos_clock; 58 59#if defined(I586_CPU) || defined(I686_CPU) 60extern u_int i586_ctr_comultiplier; 61extern u_int i586_ctr_freq; 62extern u_int i586_ctr_multiplier; 63extern unsigned i586_ctr_rate; /* fixed point */ 64extern long long i586_last_tick; 65extern long long i586_ctr_bias; 66extern unsigned long i586_avg_tick; 67#endif 68extern int timer0_max_count; 69extern u_int timer0_overflow_threshold; 70extern u_int timer0_prescaler_count; 71 72 73#if defined(I586_CPU) || defined(I686_CPU) 74static __inline u_long 75cpu_thisticklen(u_long dflt) 76{ 77 long long old; 78 long len; 79 80 if (i586_ctr_rate) { 81 old = i586_last_tick; 82 i586_last_tick = rdtsc(); 83 len = ((i586_last_tick - old) << I586_CTR_RATE_SHIFT) 84 / i586_ctr_rate; 85 i586_avg_tick = i586_avg_tick * 15 / 16 + len / 16; 86 } 87 return dflt; 88} 89#endif 90 91/* 92 * Driver to clock driver interface. 93 */ 94void DELAY __P((int usec)); 95int acquire_timer0 __P((int rate, 96 void (*function)(struct clockframe *frame))); 97int acquire_timer2 __P((int mode)); 98int release_timer0 __P((void)); 99int release_timer2 __P((void)); 100#ifndef PC98 101int rtcin __P((int val)); 102#else 103int acquire_timer1 __P((int mode)); 104int release_timer1 __P((void)); 105void rtc_serialcombit __P((int i)); 106void rtc_serialcom __P((int i)); 107void rtc_outb __P((int val)); 108#endif 109int sysbeep __P((int pitch, int period)); 110 111#endif /* KERNEL && !LOCORE */ 112 113#endif /* !_MACHINE_CLOCK_H_ */ 114