mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
cd4e23cead
be set to 1 to make FreeBSD and Tru64 coexist peacefully on a dual boot system and not clobber each other's year in the TOY clock. (Tru64 uses an offset 52 years higher than one would expect) Obtained from: NetBSD MFC After: 1 week
140 lines
2.9 KiB
C
140 lines
2.9 KiB
C
/* $FreeBSD$ */
|
|
/* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Author: Chris G. Demetriou
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
|
|
#include <machine/clockvar.h>
|
|
#include <dev/dec/mcclockvar.h>
|
|
#include <dev/dec/mc146818reg.h>
|
|
|
|
/*
|
|
* XXX rate is machine-dependent.
|
|
*/
|
|
#ifdef __alpha__
|
|
#define MC_DEFAULTRATE MC_RATE_1024_Hz
|
|
#endif
|
|
#ifdef __pmax__
|
|
#define MC_DEFAULTRATE MC_RATE_256_Hz
|
|
#endif
|
|
|
|
void
|
|
mcclock_attach(device_t dev)
|
|
{
|
|
/* Turn interrupts off, just in case. */
|
|
MCCLOCK_WRITE(dev, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
|
|
|
|
clockattach(dev);
|
|
}
|
|
|
|
void
|
|
mcclock_init(device_t dev)
|
|
{
|
|
MCCLOCK_WRITE(dev, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
|
|
MCCLOCK_WRITE(dev, MC_REGB,
|
|
MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
|
|
}
|
|
|
|
/*
|
|
* Get the time of day, based on the clock's value and/or the base value.
|
|
*/
|
|
void
|
|
mcclock_get(device_t dev, time_t base, struct clocktime *ct)
|
|
{
|
|
mc_todregs regs;
|
|
int s;
|
|
|
|
s = splclock();
|
|
MC146818_GETTOD(dev, ®s)
|
|
splx(s);
|
|
|
|
ct->sec = regs[MC_SEC];
|
|
ct->min = regs[MC_MIN];
|
|
ct->hour = regs[MC_HOUR];
|
|
ct->dow = regs[MC_DOW];
|
|
ct->day = regs[MC_DOM];
|
|
ct->mon = regs[MC_MONTH];
|
|
ct->year = regs[MC_YEAR];
|
|
}
|
|
|
|
/*
|
|
* Reset the TODR based on the time value.
|
|
*/
|
|
void
|
|
mcclock_set(device_t dev, struct clocktime *ct)
|
|
{
|
|
mc_todregs regs;
|
|
int s;
|
|
|
|
s = splclock();
|
|
MC146818_GETTOD(dev, ®s);
|
|
splx(s);
|
|
|
|
regs[MC_SEC] = ct->sec;
|
|
regs[MC_MIN] = ct->min;
|
|
regs[MC_HOUR] = ct->hour;
|
|
regs[MC_DOW] = ct->dow;
|
|
regs[MC_DOM] = ct->day;
|
|
regs[MC_MONTH] = ct->mon;
|
|
regs[MC_YEAR] = ct->year;
|
|
|
|
s = splclock();
|
|
MC146818_PUTTOD(dev, ®s);
|
|
splx(s);
|
|
}
|
|
|
|
int
|
|
mcclock_getsecs(device_t dev, int *secp)
|
|
{
|
|
int timeout = 100000000;
|
|
int sec;
|
|
int s;
|
|
|
|
s = splclock();
|
|
for (;;) {
|
|
if (!(MCCLOCK_READ(dev, MC_REGA) & MC_REGA_UIP)) {
|
|
sec = MCCLOCK_READ(dev, MC_SEC);
|
|
break;
|
|
}
|
|
if (--timeout == 0)
|
|
goto fail;
|
|
}
|
|
|
|
splx(s);
|
|
*secp = sec;
|
|
return 0;
|
|
|
|
fail:
|
|
splx(s);
|
|
return ETIMEDOUT;
|
|
}
|