1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz and Don Ahn.
7 *
8 * Redistribution and use in source and binary forms, with or without

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29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)clock.c 7.2 (Berkeley) 5/12/91
37 * $Id: clock.c,v 1.29 1994/12/30 12:43:34 bde Exp $
38 */
39
40/*
41 * inittodr, settodr and support routines written
42 * by Christoph Robitschko <chmr@edvz.tu-graz.ac.at>
43 *
44 * reintroduced and updated by Chris Stenton <chris@gnome.co.uk> 8/10/94
45 */

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50#include <sys/param.h>
51#include <sys/systm.h>
52#include <sys/time.h>
53#include <sys/kernel.h>
54#include <machine/clock.h>
55#include <machine/frame.h>
56#include <i386/isa/icu.h>
57#include <i386/isa/isa.h>
58#include <i386/isa/rtc.h>
59#include <i386/isa/timerreg.h>
60
61/*
62 * 32-bit time_t's can't reach leap years before 1904 or after 2036, so we
63 * can use a simple formula for leap years.
64 */
65#define LEAPYEAR(y) ((u_int)(y) % 4 == 0)

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553cpu_initclocks()
554{
555 int diag;
556
557 stathz = RTC_NOPROFRATE;
558 profhz = RTC_PROFRATE;
559
560 /* Finish initializing 8253 timer 0. */
561 register_intr(/* irq */ 0, /* XXX id */ 0, /* flags */ 0, clkintr,
562 &clk_imask, /* unit */ 0);
563 INTREN(IRQ0);
564
565 /* Initialize RTC. */
566 writertc(RTC_STATUSA, rtc_statusa);
567 writertc(RTC_STATUSB, RTCSB_24HR);
568 diag = rtcin(RTC_DIAG);
569 if (diag != 0)
570 printf("RTC BIOS diagnostic error %b\n", diag, RTCDG_BITS);
571 register_intr(/* irq */ 8, /* XXX id */ 1, /* flags */ 0, rtcintr,
572 &stat_imask, /* unit */ 0);
573 INTREN(IRQ8);
574 writertc(RTC_STATUSB, RTCSB_24HR | RTCSB_PINTR);
575}
576
577void
578setstatclockrate(int newhz)
579{
580 if (newhz == RTC_PROFRATE)
581 rtc_statusa = RTCSA_DIVIDER | RTCSA_PROF;
582 else
583 rtc_statusa = RTCSA_DIVIDER | RTCSA_NOPROF;
584 writertc(RTC_STATUSA, rtc_statusa);
585}