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
/* $FreeBSD$ */
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/* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <machine/clockvar.h>
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#include <dev/dec/mcclockvar.h>
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#include <dev/dec/mc146818reg.h>
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/*
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* XXX rate is machine-dependent.
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*/
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#ifdef __alpha__
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#define MC_DEFAULTRATE MC_RATE_1024_Hz
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#endif
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#ifdef __pmax__
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#define MC_DEFAULTRATE MC_RATE_256_Hz
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#endif
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void
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mcclock_attach(device_t dev)
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{
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/* Turn interrupts off, just in case. */
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MCCLOCK_WRITE(dev, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
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clockattach(dev);
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}
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void
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mcclock_init(device_t dev)
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{
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MCCLOCK_WRITE(dev, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
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MCCLOCK_WRITE(dev, MC_REGB,
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MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
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}
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/*
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* Get the time of day, based on the clock's value and/or the base value.
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*/
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void
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mcclock_get(device_t dev, time_t base, struct clocktime *ct)
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{
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mc_todregs regs;
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int s;
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s = splclock();
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MC146818_GETTOD(dev, ®s)
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splx(s);
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ct->sec = regs[MC_SEC];
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ct->min = regs[MC_MIN];
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ct->hour = regs[MC_HOUR];
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ct->dow = regs[MC_DOW];
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ct->day = regs[MC_DOM];
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ct->mon = regs[MC_MONTH];
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ct->year = regs[MC_YEAR];
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}
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/*
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* Reset the TODR based on the time value.
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*/
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void
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mcclock_set(device_t dev, struct clocktime *ct)
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{
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mc_todregs regs;
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int s;
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s = splclock();
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MC146818_GETTOD(dev, ®s);
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splx(s);
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regs[MC_SEC] = ct->sec;
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regs[MC_MIN] = ct->min;
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regs[MC_HOUR] = ct->hour;
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regs[MC_DOW] = ct->dow;
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regs[MC_DOM] = ct->day;
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regs[MC_MONTH] = ct->mon;
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regs[MC_YEAR] = ct->year;
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s = splclock();
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MC146818_PUTTOD(dev, ®s);
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splx(s);
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}
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int
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mcclock_getsecs(device_t dev, int *secp)
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{
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int timeout = 100000000;
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int sec;
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int s;
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s = splclock();
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for (;;) {
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if (!(MCCLOCK_READ(dev, MC_REGA) & MC_REGA_UIP)) {
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sec = MCCLOCK_READ(dev, MC_SEC);
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break;
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}
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if (--timeout == 0)
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goto fail;
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}
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splx(s);
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*secp = sec;
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return 0;
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fail:
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splx(s);
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return ETIMEDOUT;
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}
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