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- /*-
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * William Jolitz and Don Ahn.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)clock.c 7.2 (Berkeley) 5/12/91
- */
-
- /*
- * Primitive clock interrupt routines.
- */
- #include "param.h"
- #include "time.h"
- #include "kernel.h"
- #include "machine/segments.h"
- #include "i386/isa/icu.h"
- #include "i386/isa/isa.h"
- #include "i386/isa/rtc.h"
-
- #define DAYST 119
- #define DAYEN 303
-
- startrtclock() {
- int s;
-
- /* initialize 8253 clock */
- outb (IO_TIMER1+3, 0x36);
- outb (IO_TIMER1, 1193182/hz);
- outb (IO_TIMER1, (1193182/hz)/256);
-
- /* initialize brain-dead battery powered clock */
- outb (IO_RTC, RTC_STATUSA);
- outb (IO_RTC+1, 0x26);
- outb (IO_RTC, RTC_STATUSB);
- outb (IO_RTC+1, 2);
-
- outb (IO_RTC, RTC_DIAG);
- if (s = inb (IO_RTC+1))
- printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
- outb (IO_RTC, RTC_DIAG);
- outb (IO_RTC+1, 0);
- }
-
- /* convert 2 digit BCD number */
- bcd(i)
- int i;
- {
- return ((i/16)*10 + (i%16));
- }
-
- /* convert years to seconds (from 1970) */
- unsigned long
- ytos(y)
- int y;
- {
- int i;
- unsigned long ret;
-
- ret = 0; y = y - 70;
- for(i=0;i<y;i++) {
- if (i % 4) ret += 365*24*60*60;
- else ret += 366*24*60*60;
- }
- return ret;
- }
-
- /* convert months to seconds */
- unsigned long
- mtos(m,leap)
- int m,leap;
- {
- int i;
- unsigned long ret;
-
- ret = 0;
- for(i=1;i<m;i++) {
- switch(i){
- case 1: case 3: case 5: case 7: case 8: case 10: case 12:
- ret += 31*24*60*60; break;
- case 4: case 6: case 9: case 11:
- ret += 30*24*60*60; break;
- case 2:
- if (leap) ret += 29*24*60*60;
- else ret += 28*24*60*60;
- }
- }
- return ret;
- }
-
-
- /*
- * Initialize the time of day register, based on the time base which is, e.g.
- * from a filesystem.
- */
- inittodr(base)
- time_t base;
- {
- unsigned long sec;
- int leap,day_week,t,yd;
- int sa,s;
-
- /* do we have a realtime clock present? (otherwise we loop below) */
- sa = rtcin(RTC_STATUSA);
- if (sa == 0xff || sa == 0) return;
-
- /* ready for a read? */
- while ((sa&RTCSA_TUP) == RTCSA_TUP)
- sa = rtcin(RTC_STATUSA);
-
- sec = bcd(rtcin(RTC_YEAR));
- leap = !(sec % 4); sec += ytos(sec); /* year */
- yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec += yd; /* month */
- t = (bcd(rtcin(RTC_DAY))-1) * 24*60*60; sec += t; yd += t; /* date */
- day_week = rtcin(RTC_WDAY); /* day */
- sec += bcd(rtcin(RTC_HRS)) * 60*60; /* hour */
- sec += bcd(rtcin(RTC_MIN)) * 60; /* minutes */
- sec += bcd(rtcin(RTC_SEC)); /* seconds */
- sec -= 24*60*60; /* XXX why ??? */
-
- #ifdef notdef
- /* XXX off by one? Need to calculate DST on SUNDAY */
- /* Perhaps we should have the RTC hold GMT time to save */
- /* us the bother of converting. */
- yd = yd / 24*60*60;
- if ((yd >= DAYST) && ( yd <= DAYEN)) {
- sec -= 60*60;
- }
- #endif
- sec += tz.tz_minuteswest * 60;
-
- time.tv_sec = sec;
- }
-
- #ifdef garbage
- /*
- * Initialze the time of day register, based on the time base which is, e.g.
- * from a filesystem.
- */
- test_inittodr(base)
- time_t base;
- {
-
- outb(IO_RTC,9); /* year */
- printf("%d ",bcd(inb(IO_RTC+1)));
- outb(IO_RTC,8); /* month */
- printf("%d ",bcd(inb(IO_RTC+1)));
- outb(IO_RTC,7); /* day */
- printf("%d ",bcd(inb(IO_RTC+1)));
- outb(IO_RTC,4); /* hour */
- printf("%d ",bcd(inb(IO_RTC+1)));
- outb(IO_RTC,2); /* minutes */
- printf("%d ",bcd(inb(IO_RTC+1)));
- outb(IO_RTC,0); /* seconds */
- printf("%d\n",bcd(inb(IO_RTC+1)));
-
- time.tv_sec = base;
- }
- #endif
-
- /*
- * Restart the clock.
- */
- resettodr()
- {
- }
-
- /*
- * Wire clock interrupt in.
- */
- #define V(s) __CONCAT(V, s)
- extern V(clk)();
- enablertclock() {
- INTREN(IRQ0);
- setidt(ICU_OFFSET+0, &V(clk), SDT_SYS386IGT, SEL_KPL);
- splnone();
- }
-