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freebsd-dev/sys/amd64/include/clock.h

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Redo Kernel NTP PLL support, kernel side. This code is mostly taken from the 1.1 port (which was in turn taken from Dave Mills's kern.tar.Z example). A few significant differences: 1) ntp_gettime() is now a MIB variable rather than a system call. A few fiddles are done in libc to make it behave the same. 2) mono_time does not participate in the PLL adjustments. 3) A new interface has been defined (in <machine/clock.h>) for doing possibly machine-dependent things around the time of the clock update. This is used in Pentium kernels to disable interrupts, set `time', and reset the CPU cycle counter as quickly as possible to avoid jitter in microtime(). Measurements show an apparent resolution of a bit more than 8.14usec, which is reasonable given system-call overhead.
1994-09-18 20:40:01 +00:00
/*
* Kernel interface to machine-dependent clock driver.
* Garrett Wollman, September 1994.
* This file is in the public domain.
Fix Pentium CPU rate diagnosis: - Don't print out meaningless iCOMP numbers, those are for droids. - Use a shorter wait to determine clock rate to avoid deficiencies in DELAY(). - Use a fixed-point representation with 8 bits of fraction to store the rate and rationalize the variable name. It would be possible to use even more fraction if it turns out to be worthwhile (I rather doubt it). The question of source code arrangement remains unaddressed.
1995-11-29 19:57:22 +00:00
*
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
Redo Kernel NTP PLL support, kernel side. This code is mostly taken from the 1.1 port (which was in turn taken from Dave Mills's kern.tar.Z example). A few significant differences: 1) ntp_gettime() is now a MIB variable rather than a system call. A few fiddles are done in libc to make it behave the same. 2) mono_time does not participate in the PLL adjustments. 3) A new interface has been defined (in <machine/clock.h>) for doing possibly machine-dependent things around the time of the clock update. This is used in Pentium kernels to disable interrupts, set `time', and reset the CPU cycle counter as quickly as possible to avoid jitter in microtime(). Measurements show an apparent resolution of a bit more than 8.14usec, which is reasonable given system-call overhead.
1994-09-18 20:40:01 +00:00
*/
#ifndef _MACHINE_CLOCK_H_
Declare the full uglyness of the interfaces to the clock driver (except things declared in machine-independent files).
1994-11-05 22:51:17 +00:00
#define _MACHINE_CLOCK_H_
Redo Kernel NTP PLL support, kernel side. This code is mostly taken from the 1.1 port (which was in turn taken from Dave Mills's kern.tar.Z example). A few significant differences: 1) ntp_gettime() is now a MIB variable rather than a system call. A few fiddles are done in libc to make it behave the same. 2) mono_time does not participate in the PLL adjustments. 3) A new interface has been defined (in <machine/clock.h>) for doing possibly machine-dependent things around the time of the clock update. This is used in Pentium kernels to disable interrupts, set `time', and reset the CPU cycle counter as quickly as possible to avoid jitter in microtime(). Measurements show an apparent resolution of a bit more than 8.14usec, which is reasonable given system-call overhead.
1994-09-18 20:40:01 +00:00
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
1999-12-29 04:46:21 +00:00
#ifdef _KERNEL
Declare the full uglyness of the interfaces to the clock driver (except things declared in machine-independent files).
1994-11-05 22:51:17 +00:00
/*
* i386 to clock driver interface.
Removed vestiges of previous microtime() implementation.
1998-02-25 02:20:30 +00:00
* XXX large parts of the driver and its interface are misplaced.
Declare the full uglyness of the interfaces to the clock driver (except things declared in machine-independent files).
1994-11-05 22:51:17 +00:00
*/
extern int adjkerntz;
extern int disable_rtc_set;
wash, sort and put in order various nits from the i586_ctr -> tsc commit. Pointed out by: bde
1997-12-28 13:36:09 +00:00
extern int statclock_disable;
extern u_int timer_freq;
extern int timer0_max_count;
Rename "i586_ctr" to "tsc" (both upper and lower case instances). Fix a couple of printfs too. Warning: This changes the names of a couple of kernel options!
1997-12-26 20:42:37 +00:00
extern u_int tsc_freq;
Stop the TSC from being used as timecounter on K5/step0 machines.
1999-05-29 06:57:55 +00:00
extern int tsc_is_broken;
Added missing extern declaration of timer_freq. Sorted declarations of scalars.
1996-10-17 17:31:25 +00:00
extern int wall_cmos_clock;
Remove special handling for resuming clock interrupt when using APIC_IO. The `generic' vector stubs do the right thing.
1998-03-05 21:45:53 +00:00
#ifdef APIC_IO
extern int apic_8254_intr;
#endif
Declare the full uglyness of the interfaces to the clock driver (except things declared in machine-independent files).
1994-11-05 22:51:17 +00:00
/*
* Driver to clock driver interface.
*/
Improved biasing of i586 clock by adjusting for hardclock() latency. I decided to do this for every hardclock() call instead of lazily in microtime(). The lazy method is simpler but has more overhead if microtime() is called a lot. CPU_THISTICKLEN() is now a no-op and should probably go away. Previously it did nothing directly but had the side effect of setting i586_last_tick for CPU_CLOCKUPDATE() and i586_avg_tick for debugging. CPU_CLOCKUPDATE() now uses a better method and i586_avg_tick is too much trouble to maintain. Reduced nesting of #includes in the usual case. Increased nesting of #includes when CLOCK_HAIR is defined. This is a kludge to get typedefs for inline functions only when the inline functions are used. Normally only kern_clock.c defines this. kern_clock.c can't include the i386 headers directly. Removed unused LOCORE support.
1996-10-25 13:01:56 +00:00
struct clockframe;
Remove __P.
2002-03-20 05:48:58 +00:00
int acquire_timer0(int rate, void (*function)(struct clockframe *frame));
int acquire_timer2(int mode);
int release_timer0(void);
int release_timer2(void);
The Great PC98 Merge. All new code is "#ifdef PC98"ed so this should make no difference to PC/AT (and its clones) users. Ok'd by: core Submitted by: FreeBSD(98) development team
1996-06-14 11:02:28 +00:00
#ifndef PC98
Remove __P.
2002-03-20 05:48:58 +00:00
int rtcin(int val);
The Great PC98 Merge. All new code is "#ifdef PC98"ed so this should make no difference to PC/AT (and its clones) users. Ok'd by: core Submitted by: FreeBSD(98) development team
1996-06-14 11:02:28 +00:00
#else
Remove __P.
2002-03-20 05:48:58 +00:00
int acquire_timer1(int mode);
int release_timer1(void);
The Great PC98 Merge. All new code is "#ifdef PC98"ed so this should make no difference to PC/AT (and its clones) users. Ok'd by: core Submitted by: FreeBSD(98) development team
1996-06-14 11:02:28 +00:00
#endif
Remove __P.
2002-03-20 05:48:58 +00:00
int sysbeep(int pitch, int period);
void timer_restore(void);
Declare the full uglyness of the interfaces to the clock driver (except things declared in machine-independent files).
1994-11-05 22:51:17 +00:00
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
1999-12-29 04:46:21 +00:00
#endif /* _KERNEL */
Declare the full uglyness of the interfaces to the clock driver (except things declared in machine-independent files).
1994-11-05 22:51:17 +00:00
#endif /* !_MACHINE_CLOCK_H_ */
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