279be68bfd
The TSC-s are checked and synchronized only if they were good
originally. That is, invariant, synchronized, etc.
This is necessary on an AMD-based system where after a wakeup from STR I
see that BSP clock differs from AP clocks by a count that roughly
corresponds to one second. The APs are in sync with each other. Not
sure if this is a hardware quirk or a firmware bug.
This is what I see after a resume with this change:
SMP: passed TSC synchronization test after adjustment
acpi_timer0: restoring timecounter, ACPI-fast -> TSC-low
Reviewed by: kib
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D15551
47 lines
891 B
C
47 lines
891 B
C
/*-
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* Kernel interface to machine-dependent clock driver.
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* Garrett Wollman, September 1994.
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* This file is in the public domain.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_CLOCK_H_
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#define _MACHINE_CLOCK_H_
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#ifdef _KERNEL
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/*
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* i386 to clock driver interface.
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* XXX large parts of the driver and its interface are misplaced.
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*/
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extern int clkintr_pending;
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extern u_int i8254_freq;
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extern int i8254_max_count;
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extern uint64_t tsc_freq;
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extern int tsc_is_invariant;
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extern int tsc_perf_stat;
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#ifdef SMP
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extern int smp_tsc;
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#endif
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void i8254_init(void);
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void i8254_delay(int);
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void clock_init(void);
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/*
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* Driver to clock driver interface.
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*/
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void startrtclock(void);
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void init_TSC(void);
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void resume_TSC(void);
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#define HAS_TIMER_SPKR 1
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int timer_spkr_acquire(void);
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int timer_spkr_release(void);
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void timer_spkr_setfreq(int freq);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_CLOCK_H_ */
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