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/*
* Copyright (C) 2006, 2007 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Author: Barry deFreese and others.
*/
#ifndef _KERN_MACH_CLOCK_H_
#define _KERN_MACH_CLOCK_H_
/*
* Mach time-out and time-of-day facility.
*/
#include <mach/machine/kern_return.h>
#include <mach/time_value.h>
#include <kern/host.h>
#include <kern/queue.h>
#include <sys/types.h>
struct io_req;
typedef struct io_req *io_req_t;
/* Timers in kernel. */
extern unsigned long elapsed_ticks; /* number of ticks elapsed since bootup */
extern int hz; /* number of ticks per second */
extern int tick; /* number of usec per tick */
typedef void timer_func_t(void *);
/* Time-out element. */
struct timer_elt {
queue_chain_t chain; /* chain in order of expiration */
timer_func_t *fcn; /* function to call */
void * param; /* with this parameter */
unsigned long ticks; /* expiration time, in ticks */
int set; /* unset | set | allocated */
};
#define TELT_UNSET 0 /* timer not set */
#define TELT_SET 1 /* timer set */
#define TELT_ALLOC 2 /* timer allocated from pool */
typedef struct timer_elt timer_elt_data_t;
typedef struct timer_elt *timer_elt_t;
extern void clock_interrupt(
int usec,
boolean_t usermode,
boolean_t basepri);
extern void softclock (void);
/* For `private' timer elements. */
extern void set_timeout(
timer_elt_t telt,
unsigned int interval);
extern boolean_t reset_timeout(timer_elt_t telt);
#define set_timeout_setup(telt,fcn,param,interval) \
((telt)->fcn = (fcn), \
(telt)->param = (param), \
(telt)->private = TRUE, \
set_timeout((telt), (interval)))
#define reset_timeout_check(t) \
MACRO_BEGIN \
if ((t)->set) \
reset_timeout((t)); \
MACRO_END
extern void init_timeout (void);
/*
* Record a timestamp in STAMP. Records values in the boot-time clock
* frame.
*/
extern void record_time_stamp (time_value_t *stamp);
/*
* Read a timestamp in STAMP into RESULT. Returns values in the
* real-time clock frame.
*/
extern void read_time_stamp (time_value_t *stamp, time_value_t *result);
extern kern_return_t host_get_time(
host_t host,
time_value_t *current_time);
extern kern_return_t host_set_time(
host_t host,
time_value_t new_time);
extern kern_return_t host_adjust_time(
host_t host,
time_value_t new_adjustment,
time_value_t *old_adjustment);
extern void mapable_time_init (void);
/* For public timer elements. */
extern void timeout(timer_func_t *fcn, void *param, int interval);
extern boolean_t untimeout(timer_func_t *fcn, const void *param);
extern int timeopen(dev_t dev, int flag, io_req_t ior);
extern void timeclose(dev_t dev, int flag);
#endif /* _KERN_MACH_CLOCK_H_ */
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