1 /* 2 * Kernel interface to machine-dependent clock driver. 3 * Garrett Wollman, September 1994. 4 * This file is in the public domain. 5 */ 6 7 #ifndef _MACHINE_CLOCK_H_ 8 #define _MACHINE_CLOCK_H_ 9 10 #ifdef I586_CPU 11 12 #define I586_CYCLECTR(x) \ 13 __asm __volatile(".byte 0x0f, 0x31" : "=A" (x)) 14 15 /* 16 * When we update the clock, we also update this bias value which is 17 * automatically subtracted in microtime(). We assume that CPU_THISTICKLEN() 18 * has been called at some point in the past, so that an appropriate value is 19 * set up in i586_last_tick. (This works even if we are not being called 20 * from hardclock because hardclock will have run before and will made the 21 * call.) 22 */ 23 #define CPU_CLOCKUPDATE(otime, ntime) \ 24 do { \ 25 if(pentium_mhz) { \ 26 disable_intr(); \ 27 i586_ctr_bias = i586_last_tick; \ 28 *(otime) = *(ntime); \ 29 enable_intr(); \ 30 } else { \ 31 *(otime) = *(ntime); \ 32 } \ 33 } while(0) 34 35 #define CPU_THISTICKLEN(dflt) cpu_thisticklen(dflt) 36 #else 37 #define CPU_CLOCKUPDATE(otime, ntime) \ 38 (*(otime) = *(ntime)) 39 #define CPU_THISTICKLEN(dflt) dflt 40 #endif 41 42 #if defined(KERNEL) && !defined(LOCORE) 43 #include <sys/cdefs.h> 44 #include <machine/frame.h> 45 46 /* 47 * i386 to clock driver interface. 48 * XXX almost all of it is misplaced. i586 stuff is done in isa/clock.c 49 * and isa stuff is done in i386/microtime.s and i386/support.s. 50 */ 51 extern int adjkerntz; 52 extern int disable_rtc_set; 53 #ifdef I586_CPU 54 extern int pentium_mhz; 55 extern long long i586_last_tick; 56 extern long long i586_ctr_bias; 57 #endif 58 extern int timer0_max_count; 59 extern u_int timer0_overflow_threshold; 60 extern u_int timer0_prescaler_count; 61 62 #ifdef I586_CPU 63 void calibrate_cyclecounter __P((void)); 64 #endif 65 void clkintr __P((struct clockframe frame)); 66 void rtcintr __P((struct clockframe frame)); 67 68 #ifdef I586_CPU 69 static __inline u_long 70 cpu_thisticklen(u_long dflt) 71 { 72 long long old; 73 long rv; 74 75 if (pentium_mhz) { 76 old = i586_last_tick; 77 I586_CYCLECTR(i586_last_tick); 78 rv = (i586_last_tick - old) / pentium_mhz; 79 } else { 80 rv = dflt; 81 } 82 return rv; 83 } 84 #endif 85 86 /* 87 * Driver to clock driver interface. 88 */ 89 void DELAY __P((int usec)); 90 int acquire_timer0 __P((int rate, 91 void (*function)(struct clockframe *frame))); 92 int acquire_timer2 __P((int mode)); 93 int release_timer0 __P((void)); 94 int release_timer2 __P((void)); 95 int sysbeep __P((int pitch, int period)); 96 97 #endif /* KERNEL && !LOCORE */ 98 99 #endif /* !_MACHINE_CLOCK_H_ */ 100