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freebsd-skq/sys/i386/include/clock.h

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/* -> /*- for copyright notices, minor format tweaks as necessary
2005-01-06 22:18:23 +00:00
/*-
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
*/
- Move manipulation of td_intr_nesting_level out of assembly interrupt vector stubs and into the C functions they call. - Move disabling and EOIing of interrupt sources out of PIC driver entry points and into intr_execute_handlers(). Intr_execute_handlers() only disables a source for an interrupt if it is a stray interrupt or has threaded handlers. Sources with fast handlers no longer disable (mask) the source while executing the handlers. - Move the setting of clkintr_pending into intr_execute_handlers() and set the variable for any interrupt source with a vector of 0. (Should only be true for IRQ 0.) This fixes clkintr_pending in the NO_MIXED_MODE case. - Implement lapic_eoi() and use it to implement ioapic_eoi_source(). - Rename atpic_sched_ithd() to atpic_handle_intr() since it is used to handle all atpic interrupts and not just threaded ones. Inspired by: peter's changes to amd64 in p4 (1) Requested by: bde (2)
2003-11-12 18:13:57 +00:00
extern int clkintr_pending;
Rename timer0_max_count to i8254_max_count. Rename timer0_real_max_count to i8254_real_max_count and make it static. Rename timer_freq to i8254_freq and make it a loader tunable.
2008-03-26 15:03:24 +00:00
extern u_int i8254_freq;
extern int i8254_max_count;
Make tsc_freq a 64bit quantity. Inspired by: http://www.theinquirer.net/?article=7481
2003-01-29 11:36:39 +00:00
extern uint64_t tsc_freq;
Turn off CPU frequency change notifiers when the TSC is P-state invariant or it is forced by setting 'kern.timecounter.invariant_tsc' tunable to non-zero.
2008-10-21 00:38:00 +00:00
extern int tsc_is_invariant;
Add forgotten declarations for tsc_perf_stat from the previous commit.
2011-04-12 22:22:01 +00:00
extern int tsc_perf_stat;
Cleaned up declaration and initialization of clock_lock. It is only used by clock code, so don't export it to the world for machdep.c to initialize. There is a minor problem initializing it before it is used, since although clock initialization is split up so that parts of it can be done early, the first part was never done early enough to actually work. Split it up a bit more and do the first part as late as possible to document the necessary order. The functions that implement the split are still bogusly exported. Cleaned up initialization of the i8254 clock hardware using the new split. Actually initialize it early enough, and don't work around it not being initialized in DELAY() when DELAY() is called early for initialization of some console drivers. This unfortunately moves a little more code before the early debugger breakpoint so that it is harder to debug. The ordering of console and related initialization is delicate because we want to do as little as possible before the breakpoint, but must initialize a console.
2007-01-23 08:01:20 +00:00
void i8254_init(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
/*
* 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
Now that all platforms use genclock, shuffle things around slightly for better structure. Much of this is related to <sys/clock.h>, which should really have been called <sys/calendar.h>, but unless and until we need the name, the repocopy can wait. In general the kernel does not know about minutes, hours, days, timezones, daylight savings time, leap-years and such. All that is theoretically a matter for userland only. Parts of kernel code does however care: badly designed filesystems store timestamps in local time and RTC chips almost universally track time in a YY-MM-DD HH:MM:SS format, and sometimes in local timezone instead of UTC. For this we have <sys/clock.h> <sys/time.h> on the other hand, deals with time_t, timeval, timespec and so on. These know only seconds and fractions thereof. Move inittodr() and resettodr() prototypes to <sys/time.h>. Retain the names as it is one of the few surviving PDP/VAX references. Move startrtclock() to <machine/clock.h> on relevant platforms, it is a MD call between machdep.c/clock.c. Remove references to it elsewhere. Remove a lot of unnecessary <sys/clock.h> includes. Move the machdep.disable_rtc_set sysctl to subr_rtc.c where it belongs. XXX: should be kern.disable_rtc_set really, it's not MD.
2008-04-22 19:38:30 +00:00
void startrtclock(void);
Remove __P.
2002-03-20 05:48:58 +00:00
void timer_restore(void);
i386/i386/tsc.c was repo-copied from i386/isa/clock.c. Remove all the stuff that does not relate to the TSC. Change the calibration to use DELAY(1000000) rather than trying to check it against the CMOS RTC, this drastically increases precision: Using 25 samples on a Athlon 700MHz UP machine I find: stddev min max average CMOS 22200 Hz -74980 Hz 34301 Hz 704928721 Hz DELAY 1805 Hz -1984 Hz 2678 Hz 704937583 Hz (The difference between the two averages is not statistically significant.) expressed in PPM of the frequency: stddev min max CMOS 31.49 PPM -106.37 PPM 48.66 PPM DELAY 2.56 PPM 2.81 PPM 3.80 PPM This code will not be used until a followup commit to sys/isa/clock.c and sys/pc98/pc98/clock.c which will only happen after some field testing.
2003-02-05 09:20:40 +00:00
void init_TSC(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
The "free-lance" timer in the i8254 is only used for the speaker these days, so de-generalize the acquire_timer/release_timer api to just deal with speakers. The new (optional) MD functions are: timer_spkr_acquire() timer_spkr_release() and timer_spkr_setfreq() the last of which configures the timer to generate a tone of a given frequency, in Hz instead of 1/1193182th of seconds. Drop entirely timer2 on pc98, it is not used anywhere at all. Move sysbeep() to kern/tty_cons.c and use the timer_spkr*() if they exist, and do nothing otherwise. Remove prototypes and empty acquire-/release-timer() and sysbeep() functions from the non-beeping archs. This eliminate the need for the speaker driver to know about i8254frequency at all. In theory this makes the speaker driver MI, contingent on the timer_spkr_*() functions existing but the driver does not know this yet and still attaches to the ISA bus. Syscons is more tricky, in one function, sc_tone(), it knows the hz and things are just fine. In the other function, sc_bell() it seems to get the period from the KDMKTONE ioctl in terms if 1/1193182th second, so we hardcode the 1193182 and leave it at that. It's probably not important. Change a few other sysbeep() uses which obviously knew that the argument was in terms of i8254 frequency, and leave alone those that look like people thought sysbeep() took frequency in hertz. This eliminates the knowledge of i8254_freq from all but the actual clock.c code and the prof_machdep.c on amd64 and i386, where I think it would be smart to ask for help from the timecounters anyway [TBD].
2008-03-26 20:09:21 +00:00
#define HAS_TIMER_SPKR 1
int timer_spkr_acquire(void);
int timer_spkr_release(void);
void timer_spkr_setfreq(int freq);
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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