freebsd-dev/sys/ia64/include/clock.h

/*-
 * Kernel interface to machine-dependent clock driver.
 * Garrett Wollman, September 1994.
 * This file is in the public domain.
 *
 * $FreeBSD$
 */

#ifndef _MACHINE_CLOCK_H_
#define	_MACHINE_CLOCK_H_

#ifdef _KERNEL

#define	CLOCK_VECTOR	254

extern uint64_t	ia64_clock_reload;
extern uint64_t	itc_frequency;

#endif

#endif /* !_MACHINE_CLOCK_H_ */
/* -> /*- for copyright notices, minor format tweaks as necessary 2005-01-06 22:18:23 +00:00			`/*-`
This is the first snapshot of the FreeBSD/ia64 kernel. This kernel will not work on any real hardware (or fully work on any simulator). Much more needs to happen before this is actually functional but its nice to see the FreeBSD copyright message appear in the ia64 simulator. 2000-09-29 13:46:07 +00:00			`* Kernel interface to machine-dependent clock driver.`
			`* Garrett Wollman, September 1994.`
			`* This file is in the public domain.`
			`*`
			`* $FreeBSD$`
			`*/`

			`#ifndef _MACHINE_CLOCK_H_`
			`#define _MACHINE_CLOCK_H_`

			`#ifdef _KERNEL`

Replace the hardcoding of 255 as the clock interrupt vector with CLOCK_VECTOR and define it as 254, not 255. Vector 255 is already in use as the AP wakeup vector on the HP rx2600. This needs to be made more dynamic. The likelyhood of vector 254 being in use is pretty small, but we already have code to assign vectors to IPIs (see sal.c) and it's preobably better to have a centralized "vector manager" that hands out vectors based on some imput (like priority). 2003-01-06 01:39:25 +00:00			`#define CLOCK_VECTOR 254`

Cleanup the clock code. This includes: o Remove alpha specific timer code (mc146818A) and compiled-out calibration of said timer. o Remove i386 inherited timer code (i8253) and related acquire and release functions. o Move sysbeep() from clock.c to machdep.c and have it return ENODEV. Console beeps should be implemented using ACPI or if no such device is described, using the sound driver. o Move the sysctls related to adjkerntz, disable_rtc_set and wall_cmos_clock from machdep.c to clock.c, where the variables are. o Don't hardcode a hz value of 1024 in cpu_initclocks() and don't bother faking a stathz that's 1/8 of that. Keep it simple: hz defaults to HZ and stathz equals hz. This is also how it's done for sparc64. o Keep a per-CPU ITC counter (pc_clock) and adjustment (pc_clockadj) to calculate ITC skew and corrections. On average, we adjust the ITC match register once every ~1500 interrupts for a duration of 2 consequtive interruprs. This is to correct the non-deterministic behaviour of the ITC interrupt (there's a delay between the match and the raising of the interrupt). o Add 4 debugging sysctls to monitor clock behaviour. Those are debug.clock_adjust_edges, debug.clock_adjust_excess, debug.clock_adjust_lost and debug.clock_adjust_ticks. The first counts the individual adjustment cycles (when the skew first crosses the threshold), the second counts the number of times the adjustment was excessive (any non-zero value is to be considered a bug), the third counts lost clock interrupts and the last counts the number of interrupts for which we applied an adjustment (debug.clock_adjust_ticks / debug.clock_adjust_edges gives the avarage duration of an individual adjustment -- should be ~2). While here, remove some nearby (trivial) left-overs from alpha and other cleanups. 2003-08-04 05:13:18 +00:00			`extern uint64_t ia64_clock_reload;`
			`extern uint64_t itc_frequency;`
Declare itc_frequency and itm_reload. 2002-10-04 01:23:58 +00:00
This is the first snapshot of the FreeBSD/ia64 kernel. This kernel will not work on any real hardware (or fully work on any simulator). Much more needs to happen before this is actually functional but its nice to see the FreeBSD copyright message appear in the ia64 simulator. 2000-09-29 13:46:07 +00:00			`#endif`

			`#endif /* !_MACHINE_CLOCK_H_ */`