353 lines
9.1 KiB
C
353 lines
9.1 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz and Don Ahn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)clock.c 7.2 (Berkeley) 5/12/91
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* $Id: clock.c,v 1.17 1994/02/08 05:10:48 mycroft Exp $
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1991,1990,1989 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* 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 FOR
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* 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 Mellon
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* the rights to redistribute these changes.
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*/
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/*
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Copyright 1988, 1989 by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Primitive clock interrupt routines.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <machine/cpu.h>
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#include <machine/pio.h>
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#include <i386/isa/icu.h>
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#include <i386/isa/isa.h>
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#include <i386/isa/clock.h>
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#include <i386/isa/rtc.h>
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#include <i386/isa/timerreg.h>
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void spinwait __P((int));
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void
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startrtclock(void)
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{
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int s;
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findcpuspeed(); /* use the clock (while it's free)
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to find the cpu speed */
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/* initialize 8253 clock */
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outb(TIMER_MODE, TIMER_SEL0|TIMER_RATEGEN|TIMER_16BIT);
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/* Correct rounding will buy us a better precision in timekeeping */
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outb (IO_TIMER1, TIMER_DIV(hz)%256);
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outb (IO_TIMER1, TIMER_DIV(hz)/256);
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/* Check diagnostic status */
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outb (IO_RTC, RTC_DIAG);
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if (s = inb (IO_RTC+1))
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printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
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}
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void
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clockintr(frame)
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clockframe frame;
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{
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hardclock(&frame);
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}
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unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
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#define FIRST_GUESS 0x2000
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findcpuspeed(void)
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{
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unsigned char low;
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unsigned int remainder;
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/* Put counter in count down mode */
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outb(IO_TIMER1+3, 0x34);
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outb(IO_TIMER1, 0xff);
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outb(IO_TIMER1, 0xff);
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delaycount = FIRST_GUESS;
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spinwait(1);
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/* Read the value left in the counter */
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low = inb(IO_TIMER1); /* least siginifcant */
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remainder = inb(IO_TIMER1); /* most significant */
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remainder = (remainder<<8) + low ;
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/* Formula for delaycount is :
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* (loopcount * timer clock speed)/ (counter ticks * 1000)
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*/
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delaycount = (FIRST_GUESS * TIMER_DIV(1000)) / (0xffff-remainder);
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}
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/*
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* Wire clock interrupt in.
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*/
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#define VEC(s) __CONCAT(X, s)
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extern VEC(clk)();
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void
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enablertclock(void) {
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setidt(ICU_OFFSET+0, &VEC(clk), SDT_SYS386IGT, SEL_KPL);
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INTREN(IRQ0);
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}
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/*
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* Delay for some number of milliseconds.
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*/
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void
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spinwait(int millisecs)
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{
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DELAY(1000 * millisecs);
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}
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static int first_rtcopen_ever = 1;
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void
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rtcinit(void)
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{
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if (first_rtcopen_ever) {
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outb(IO_RTC, RTC_STATUSA);
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outb(IO_RTC+1, RTC_DIV2 | RTC_RATE6);
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outb(IO_RTC, RTC_STATUSB);
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outb(IO_RTC+1, RTC_HM);
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first_rtcopen_ever = 0;
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}
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}
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int
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rtcget(struct rtc_st *rtc_regs)
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{
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int i;
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u_char *regs = (u_char *)rtc_regs;
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if (first_rtcopen_ever) {
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rtcinit();
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}
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outb(IO_RTC, RTC_D);
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if (inb(IO_RTC+1) & RTC_VRT == 0) return(-1);
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outb(IO_RTC, RTC_STATUSA);
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while (inb(IO_RTC+1) & RTC_UIP) /* busy wait */
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outb(IO_RTC, RTC_STATUSA);
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for (i = 0; i < RTC_NREG; i++) {
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outb(IO_RTC, i);
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regs[i] = inb(IO_RTC+1);
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}
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return(0);
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}
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void
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rtcput(struct rtc_st *rtc_regs)
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{
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u_char x;
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int i;
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u_char *regs = (u_char *)rtc_regs;
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if (first_rtcopen_ever) {
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rtcinit();
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}
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outb(IO_RTC, RTC_STATUSB);
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x = inb(IO_RTC+1);
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outb(IO_RTC, RTC_STATUSB);
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outb(IO_RTC+1, x | RTC_SET);
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for (i = 0; i < RTC_NREGP; i++) {
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outb(IO_RTC, i);
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outb(IO_RTC+1, regs[i]);
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}
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outb(IO_RTC, RTC_STATUSB);
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outb(IO_RTC+1, x & ~RTC_SET);
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}
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static int month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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static int
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yeartoday(int year)
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{
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return((year%4) ? 365 : 366);
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}
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int
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hexdectodec(char n)
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{
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return(((n>>4)&0x0F)*10 + (n&0x0F));
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}
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char
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dectohexdec(int n)
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{
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return((char)(((n/10)<<4)&0xF0) | ((n%10)&0x0F));
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}
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/*
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* Initialize the time of day register, based on the time base which is, e.g.
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* from a filesystem.
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*/
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void
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inittodr(base)
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time_t base;
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{
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/*
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* We ignore the suggested time for now and go for the RTC
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* clock time stored in the CMOS RAM.
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*/
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struct rtc_st rtclk;
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time_t n;
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int sec, min, hr, dom, mon, yr;
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int i, days = 0;
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int ospl;
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ospl = splclock();
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if (rtcget(&rtclk)) {
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splx(ospl);
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return;
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}
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splx (ospl);
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sec = hexdectodec(rtclk.rtc_sec);
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min = hexdectodec(rtclk.rtc_min);
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hr = hexdectodec(rtclk.rtc_hr);
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dom = hexdectodec(rtclk.rtc_dom);
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mon = hexdectodec(rtclk.rtc_mon);
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yr = hexdectodec(rtclk.rtc_yr);
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yr = (yr < 70) ? yr+100 : yr;
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n = sec + 60 * min + 3600 * hr;
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n += (dom - 1) * 3600 * 24;
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if (yeartoday(yr) == 366)
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month[1] = 29;
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for (i = mon - 2; i >= 0; i--)
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days += month[i];
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month[1] = 28;
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for (i = 70; i < yr; i++)
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days += yeartoday(i);
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n += days * 3600 * 24;
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n += tz.tz_minuteswest * 60;
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if (tz.tz_dsttime)
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n -= 3600;
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time.tv_sec = n;
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time.tv_usec = 0;
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}
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/*
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* Reset the clock.
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*/
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void
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resettodr()
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{
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struct rtc_st rtclk;
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time_t n;
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int diff, i, j;
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int ospl;
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ospl = splclock();
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if (rtcget(&rtclk)) {
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bzero(&rtclk, sizeof(rtclk));
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}
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splx(ospl);
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diff = tz.tz_minuteswest * 60;
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if (tz.tz_dsttime)
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diff -= 3600;
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n = (time.tv_sec - diff) % (3600 * 24); /* hrs+mins+secs */
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rtclk.rtc_sec = dectohexdec(n%60);
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n /= 60;
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rtclk.rtc_min = dectohexdec(n%60);
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rtclk.rtc_hr = dectohexdec(n/60);
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n = (time.tv_sec - diff) / (3600 * 24); /* days */
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rtclk.rtc_dow = (n + 4) % 7; /* 1/1/70 is Thursday */
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for (j = 1970, i = yeartoday(j); n >= i; j++, i = yeartoday(j))
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n -= i;
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rtclk.rtc_yr = dectohexdec(j - 1900);
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if (i == 366)
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month[1] = 29;
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for (i = 0; n >= month[i]; i++)
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n -= month[i];
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month[1] = 28;
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rtclk.rtc_mon = dectohexdec(++i);
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rtclk.rtc_dom = dectohexdec(++n);
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ospl = splclock();
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rtcput(&rtclk);
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splx(ospl);
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}
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