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clock_subr.h
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107 lines (94 loc) · 3.48 KB
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/* $NetBSD: clock_subr.h,v 1.33 2025/09/09 14:52:10 christos Exp $ */
/*-
* Copyright (c) 1996, 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Gordon W. Ross
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _DEV_CLOCK_SUBR_H_
#define _DEV_CLOCK_SUBR_H_
#include <sys/clock.h>
#include <sys/device_if.h>
#include <sys/stdbool.h>
/*
* "POSIX time" to/from "YY/MM/DD/hh/mm/ss"
*/
struct clock_ymdhms {
uint64_t dt_year;
uint8_t dt_mon;
uint8_t dt_day;
uint8_t dt_wday; /* Day of week */
uint8_t dt_hour;
uint8_t dt_min;
uint8_t dt_sec;
};
time_t clock_ymdhms_to_secs(struct clock_ymdhms *);
int clock_secs_to_ymdhms(time_t, struct clock_ymdhms *);
/*
* BCD to binary and binary to BCD.
*/
static __inline unsigned int
bcdtobin(unsigned int bcd)
{
return ((bcd >> 4) & 0x0f) * 10 + (bcd & 0x0f);
}
static __inline unsigned int
bintobcd(unsigned int bin)
{
return (((bin / 10) << 4) & 0xf0) | (bin % 10);
}
/*
* Interface to time-of-day clock devices.
*
* todr_gettime: convert time-of-day clock into a `struct timeval'
* todr_settime: set time-of-day clock from a `struct timeval'
*
* (this is probably not so useful:)
* todr_setwen: provide a machine-dependent TOD clock write-enable callback
* function which takes one boolean argument:
* 1 to enable writes; 0 to disable writes.
*/
struct timeval;
struct todr_chip_handle {
device_t todr_dev; /* Device backing the TOD clock */
void *todr_devaux; /* Auxillary data (maybe) needed by device */
time_t todr_base_time; /* Base time (e.g. rootfs time) */
int (*todr_gettime)(struct todr_chip_handle *, struct timeval *);
int (*todr_settime)(struct todr_chip_handle *, struct timeval *);
int (*todr_gettime_ymdhms)(struct todr_chip_handle *,
struct clock_ymdhms *);
int (*todr_settime_ymdhms)(struct todr_chip_handle *,
struct clock_ymdhms *);
int (*todr_setwen)(struct todr_chip_handle *, int);
};
typedef struct todr_chip_handle *todr_chip_handle_t;
void todr_init(void);
void todr_attach(todr_chip_handle_t);
void todr_lock(void);
void todr_unlock(void);
bool todr_lock_owned(void);
void todr_set_systime(time_t base);
void todr_save_systime(void);
#endif /* _DEV_CLOCK_SUBR_H_ */