The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/clock.h

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    1 /*-
    2  * Kernel interface to machine-dependent clock driver.
    3  * Garrett Wollman, September 1994.
    4  * This file is in the public domain.
    5  *
    6  * $FreeBSD: head/sys/i386/include/clock.h 334204 2018-05-25 07:33:20Z avg $
    7  */
    8 
    9 #ifndef _MACHINE_CLOCK_H_
   10 #define _MACHINE_CLOCK_H_
   11 
   12 #ifdef _KERNEL
   13 /*
   14  * i386 to clock driver interface.
   15  * XXX large parts of the driver and its interface are misplaced.
   16  */
   17 extern int      clkintr_pending;
   18 extern u_int    i8254_freq;
   19 extern int      i8254_max_count;
   20 extern uint64_t tsc_freq;
   21 extern int      tsc_is_invariant;
   22 extern int      tsc_perf_stat;
   23 
   24 void    i8254_init(void);
   25 void    i8254_delay(int);
   26 void    clock_init(void);
   27 
   28 /*
   29  * Driver to clock driver interface.
   30  */
   31 
   32 void    startrtclock(void);
   33 void    timer_restore(void);
   34 void    init_TSC(void);
   35 void    resume_TSC(void);
   36 
   37 #define HAS_TIMER_SPKR 1
   38 int     timer_spkr_acquire(void);
   39 int     timer_spkr_release(void);
   40 void    timer_spkr_setfreq(int freq);
   41 
   42 #endif /* _KERNEL */
   43 
   44 #endif /* !_MACHINE_CLOCK_H_ */

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