* Copyright (c) 1988 University of Utah.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department, Ralph Campbell, and Kazumasa Utashiro of
* Software Research Associates, Inc.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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
* from: Utah $Hdr: clock.c 1.18 91/01/21$
* @(#)clock.c 8.1 (Berkeley) 6/11/93
#include <machine/adrsmap.h>
#include <news3400/news3400/clockreg.h>
* Machine-dependent clock routines.
* Startrtclock restarts the real-time clock, which provides
* hardclock interrupts to kern_clock.c.
* Inittodr initializes the time of day hardware which provides
* date functions. Its primary function is to use some file
* system information in case the hardare clock lost state.
* Resettodr restores the time of day hardware after a time change.
* We assume newhz is either stathz or profhz, and that neither will
* change after being set up above. Could recalculate intervals here
* but that would be a drag.
/* KU:XXX do something! */
* Set up the real-time and statistics clocks. Leave stathz 0 only if
* no alternative timer is available.
* Start the real-time clock.
*(char *)ITIMER
= IOCLOCK
/ 6144 / 100 - 1;
* Enable the real-time clock.
*(char *)INTEN0
|= (char)INTEN0_TIMINT
;
* This code is defunct after 2099.
* Will Unix still be here then??
static short dayyr
[12] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
#define bcd_to_int(BCD) (i = BCD, (((i) >> 4) & 0xf) * 10 + ((i) & 0xf))
#define int_to_bcd(INT) (i = INT, ((((i) / 10) % 10) << 4) + (i) % 10)
* Initialze the time of day register, based on the time base which is, e.g.
* from a filesystem. Base provides the time to within six months,
* and the time of year clock (if any) provides the rest.
register volatile u_char
*rtc_port
= (u_char
*)RTC_PORT
;
register volatile u_char
*rtc_data
= (u_char
*)DATA_PORT
;
int sec
, min
, hour
, week
, day
, mon
, year
;
long deltat
, badbase
= 0;
printf("WARNING: preposterous time in file system\n");
/* read the system clock anyway */
base
= 6*SECYR
+ 186*SECDAY
+ SECDAY
/2;
sec
= bcd_to_int(*rtc_data
++);
min
= bcd_to_int(*rtc_data
++);
hour
= bcd_to_int(*rtc_data
++);
week
= bcd_to_int(*rtc_data
++);
day
= bcd_to_int(*rtc_data
++);
mon
= bcd_to_int(*rtc_data
++);
year
= bcd_to_int(*rtc_data
++);
/* simple sanity checks */
if (year
< 70 || mon
< 1 || mon
> 12 || day
< 1 || day
> 31 ||
hour
> 23 || min
> 59 || sec
> 59) {
printf("WARNING: preposterous clock chip time\n");
* Believe the time in the file system for lack of
* anything better, resetting the TODR.
for (yr
= 70; yr
< year
; yr
++)
days
+= LEAPYEAR(yr
) ? 366 : 365;
days
+= dayyr
[mon
- 1] + day
- 1;
if (LEAPYEAR(yr
) && mon
> 2)
/* now have days since Jan 1, 1970; the rest is easy... */
time
.tv_sec
= days
* SECDAY
+ hour
* 3600 + min
* 60 + sec
;
* See if we gained/lost two or more days;
* if so, assume something is amiss.
deltat
= time
.tv_sec
- base
;
printf("WARNING: clock %s %d days",
time
.tv_sec
< base
? "lost" : "gained", deltat
/ SECDAY
);
printf(" -- CHECK AND RESET THE DATE!\n");
* Reset the TODR based on the time value; used when the TODR
* has a preposterous value and also when the time is reset
* by the stime system call. Also called when the TODR goes past
* TODRZERO + 100*(SECYEAR+2*SECDAY) (e.g. on Jan 2 just after midnight)
* to wrap the TODR around.
register volatile u_char
*rtc_port
= (u_char
*)RTC_PORT
;
register volatile u_char
*rtc_data
= (u_char
*)DATA_PORT
;
int sec
, min
, hour
, week
, day
, mon
, year
;
t2
= time
.tv_sec
/ SECDAY
;
while (t2
>= 0) { /* whittle off years */
t2
-= LEAPYEAR(t
) ? 366 : 365;
/* t3 = month + day; separate */
for (t2
= 1; t2
< 12; t2
++)
if (t3
< dayyr
[t2
] + (t
&& t2
> 1))
t3
= t3
- dayyr
[t2
- 1] + 1;
t
= time
.tv_sec
% SECDAY
;
*rtc_data
++ = int_to_bcd(sec
);
*rtc_data
++ = int_to_bcd(min
);
*rtc_data
++ = int_to_bcd(hour
);
*rtc_data
++ = int_to_bcd(week
);
*rtc_data
++ = int_to_bcd(day
);
*rtc_data
++ = int_to_bcd(mon
);
*rtc_data
= int_to_bcd(year
);