e7fa55af89
functions which run for several milliseconds at a time and getting in queue behind one or more of those makes us miss our rewind. Instead call it from hardclock() like we used to do, but retain the prescaler so we still cope with high HZ values.
68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/*-
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_TIMETC_H_
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#define _SYS_TIMETC_H_
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#ifndef _KERNEL
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#error "no user-serviceable parts inside"
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#endif
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/*-
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* `struct timecounter' is the interface between the hardware which implements
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* a timecounter and the MI code which uses this to keep track of time.
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*
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* A timecounter is a binary counter which has two properties:
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* * it runs at a fixed, known frequency.
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* * it has sufficient bits to not roll over in less than approximately
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* max(2 msec, 2/HZ seconds). (The value 2 here is really 1 + delta,
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* for some indeterminate value of delta.)
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*/
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struct timecounter;
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typedef u_int timecounter_get_t(struct timecounter *);
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typedef void timecounter_pps_t(struct timecounter *);
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struct timecounter {
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timecounter_get_t *tc_get_timecount;
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/*
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* This function reads the counter. It is not required to
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* mask any unimplemented bits out, as long as they are
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* constant.
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*/
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timecounter_pps_t *tc_poll_pps;
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/*
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* This function is optional. It will be called whenever the
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* timecounter is rewound, and is intended to check for PPS
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* events. Normal hardware does not need it but timecounters
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* which latch PPS in hardware (like sys/pci/xrpu.c) do.
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*/
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u_int tc_counter_mask;
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/* This mask should mask off any unimplemented bits. */
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u_int32_t tc_frequency;
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/* Frequency of the counter in Hz. */
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char *tc_name;
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/* Name of the timecounter. */
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void *tc_priv;
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/* Pointer to the timecounter's private parts. */
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struct timecounter *tc_next;
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/* Pointer to the next timecounter. */
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};
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extern struct timecounter *timecounter;
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u_int32_t tc_getfrequency(void);
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void tc_init(struct timecounter *tc);
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void tc_setclock(struct timespec *ts);
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void tc_ticktock(void);
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#endif /* !_SYS_TIMETC_H_ */
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