252 lines
6.3 KiB
C
252 lines
6.3 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 1.5 1993/12/19 00:50:30 wollman Exp $
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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 "param.h"
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#include "systm.h"
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#include "time.h"
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#include "kernel.h"
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#include "machine/segments.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/rtc.h"
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#include "i386/isa/timerreg.h"
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/* X-tals being what they are, it's nice to be able to fudge this one... */
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/* Note, the name changed here from XTALSPEED to TIMER_FREQ rgrimes 4/26/93 */
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#ifndef TIMER_FREQ
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#define TIMER_FREQ 1193182 /* XXX - should be in isa.h */
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#endif
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static void findcpuspeed(void);
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void
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startrtclock()
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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_FREQ+hz/2)/hz);
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outb (IO_TIMER1, ((TIMER_FREQ+hz/2)/hz)/256);
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/* initialize brain-dead battery powered clock */
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outb (IO_RTC, RTC_STATUSA);
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outb (IO_RTC+1, 0x26);
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outb (IO_RTC, RTC_STATUSB);
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outb (IO_RTC+1, 2);
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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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unsigned int delaycount; /* calibrated loop variable (1 millisecond) */
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#define FIRST_GUESS 0x2000
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static void
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findcpuspeed()
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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_FREQ/1000)) / (0xffff-remainder);
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}
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/* convert 2 digit BCD number */
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int
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bcd(i)
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int i;
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{
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return ((i/16)*10 + (i%16));
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}
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/* convert years to seconds (from 1970) */
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unsigned long
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ytos(y)
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int y;
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{
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int i;
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unsigned long ret;
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ret = 0;
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for(i = 1970; i < y; i++) {
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if (i % 4) ret += 365*24*60*60;
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else ret += 366*24*60*60;
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}
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return ret;
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}
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/* convert months to seconds */
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unsigned long
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mtos(m,leap)
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int m,leap;
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{
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int i;
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unsigned long ret;
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ret = 0;
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for(i=1;i<m;i++) {
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switch(i){
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case 1: case 3: case 5: case 7: case 8: case 10: case 12:
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ret += 31*24*60*60; break;
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case 4: case 6: case 9: case 11:
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ret += 30*24*60*60; break;
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case 2:
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if (leap) ret += 29*24*60*60;
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else ret += 28*24*60*60;
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}
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}
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return ret;
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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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unsigned long sec;
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int leap,day_week,t,yd;
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int sa,s;
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/* do we have a realtime clock present? (otherwise we loop below) */
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sa = rtcin(RTC_STATUSA);
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if (sa == 0xff || sa == 0) return;
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/* ready for a read? */
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while ((sa&RTCSA_TUP) == RTCSA_TUP)
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sa = rtcin(RTC_STATUSA);
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sec = bcd(rtcin(RTC_YEAR)) + 1900;
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if (sec < 1970)
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sec += 100;
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leap = !(sec % 4); sec = ytos(sec); /* year */
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yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec += yd; /* month */
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t = (bcd(rtcin(RTC_DAY))-1) * 24*60*60; sec += t; yd += t; /* date */
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day_week = rtcin(RTC_WDAY); /* day */
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sec += bcd(rtcin(RTC_HRS)) * 60*60; /* hour */
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sec += bcd(rtcin(RTC_MIN)) * 60; /* minutes */
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sec += bcd(rtcin(RTC_SEC)); /* seconds */
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sec += tz.tz_minuteswest * 60;
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time.tv_sec = sec;
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}
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#ifdef garbage
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/*
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* Initialze 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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test_inittodr(base)
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time_t base;
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{
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outb(IO_RTC,9); /* year */
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printf("%d ",bcd(inb(IO_RTC+1)));
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outb(IO_RTC,8); /* month */
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printf("%d ",bcd(inb(IO_RTC+1)));
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outb(IO_RTC,7); /* day */
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printf("%d ",bcd(inb(IO_RTC+1)));
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outb(IO_RTC,4); /* hour */
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printf("%d ",bcd(inb(IO_RTC+1)));
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outb(IO_RTC,2); /* minutes */
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printf("%d ",bcd(inb(IO_RTC+1)));
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outb(IO_RTC,0); /* seconds */
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printf("%d\n",bcd(inb(IO_RTC+1)));
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time.tv_sec = base;
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}
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#endif
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/*
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* Restart the clock.
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*/
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void
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resettodr()
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{
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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 V(s) __CONCAT(V, s)
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extern void V(clk)();
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void
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enablertclock()
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{
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setidt(ICU_OFFSET+0, &V(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(millisecs)
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int millisecs;
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{
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DELAY(1000 * millisecs);
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}
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