Return to clock.c CVS log

Up to [Net/2] / Net2 / arch / i386 / isa

Annotation of Net2/arch/i386/isa/clock.c, revision 1.1

1.1     ! root        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
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            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:  *     @(#)clock.c     7.2 (Berkeley) 5/12/91
        !            37:  */
        !            38: 
        !            39: /*
        !            40:  * Primitive clock interrupt routines.
        !            41:  */
        !            42: #include "param.h"
        !            43: #include "time.h"
        !            44: #include "kernel.h"
        !            45: #include "machine/segments.h"
        !            46: #include "i386/isa/icu.h"
        !            47: #include "i386/isa/isa.h"
        !            48: #include "i386/isa/rtc.h"
        !            49: 
        !            50: #define DAYST 119
        !            51: #define DAYEN 303
        !            52: 
        !            53: startrtclock() {
        !            54:        int s;
        !            55: 
        !            56:        /* initialize 8253 clock */
        !            57:        outb (IO_TIMER1+3, 0x36);
        !            58:        outb (IO_TIMER1, 1193182/hz);
        !            59:        outb (IO_TIMER1, (1193182/hz)/256);
        !            60: 
        !            61:        /* initialize brain-dead battery powered clock */
        !            62:        outb (IO_RTC, RTC_STATUSA);
        !            63:        outb (IO_RTC+1, 0x26);
        !            64:        outb (IO_RTC, RTC_STATUSB);
        !            65:        outb (IO_RTC+1, 2);
        !            66: 
        !            67:        outb (IO_RTC, RTC_DIAG);
        !            68:        if (s = inb (IO_RTC+1))
        !            69:                printf("RTC BIOS diagnostic error %b\n", s, RTCDG_BITS);
        !            70:        outb (IO_RTC, RTC_DIAG);
        !            71:        outb (IO_RTC+1, 0);
        !            72: }
        !            73: 
        !            74: /* convert 2 digit BCD number */
        !            75: bcd(i)
        !            76: int i;
        !            77: {
        !            78:        return ((i/16)*10 + (i%16));
        !            79: }
        !            80: 
        !            81: /* convert years to seconds (from 1970) */
        !            82: unsigned long
        !            83: ytos(y)
        !            84: int y;
        !            85: {
        !            86:        int i;
        !            87:        unsigned long ret;
        !            88: 
        !            89:        ret = 0; y = y - 70;
        !            90:        for(i=0;i<y;i++) {
        !            91:                if (i % 4) ret += 365*24*60*60;
        !            92:                else ret += 366*24*60*60;
        !            93:        }
        !            94:        return ret;
        !            95: }
        !            96: 
        !            97: /* convert months to seconds */
        !            98: unsigned long
        !            99: mtos(m,leap)
        !           100: int m,leap;
        !           101: {
        !           102:        int i;
        !           103:        unsigned long ret;
        !           104: 
        !           105:        ret = 0;
        !           106:        for(i=1;i<m;i++) {
        !           107:                switch(i){
        !           108:                case 1: case 3: case 5: case 7: case 8: case 10: case 12:
        !           109:                        ret += 31*24*60*60; break;
        !           110:                case 4: case 6: case 9: case 11:
        !           111:                        ret += 30*24*60*60; break;
        !           112:                case 2:
        !           113:                        if (leap) ret += 29*24*60*60;
        !           114:                        else ret += 28*24*60*60;
        !           115:                }
        !           116:        }
        !           117:        return ret;
        !           118: }
        !           119: 
        !           120: 
        !           121: /*
        !           122:  * Initialize the time of day register, based on the time base which is, e.g.
        !           123:  * from a filesystem.
        !           124:  */
        !           125: inittodr(base)
        !           126:        time_t base;
        !           127: {
        !           128:        unsigned long sec;
        !           129:        int leap,day_week,t,yd;
        !           130:        int sa,s;
        !           131: 
        !           132:        /* do we have a realtime clock present? (otherwise we loop below) */
        !           133:        sa = rtcin(RTC_STATUSA);
        !           134:        if (sa == 0xff || sa == 0) return;
        !           135: 
        !           136:        /* ready for a read? */
        !           137:        while ((sa&RTCSA_TUP) == RTCSA_TUP)
        !           138:                sa = rtcin(RTC_STATUSA);
        !           139: 
        !           140:        sec = bcd(rtcin(RTC_YEAR));
        !           141:        leap = !(sec % 4); sec += ytos(sec); /* year    */
        !           142:        yd = mtos(bcd(rtcin(RTC_MONTH)),leap); sec += yd;       /* month   */
        !           143:        t = (bcd(rtcin(RTC_DAY))-1) * 24*60*60; sec += t; yd += t; /* date    */
        !           144:        day_week = rtcin(RTC_WDAY);                             /* day     */
        !           145:        sec += bcd(rtcin(RTC_HRS)) * 60*60;                     /* hour    */
        !           146:        sec += bcd(rtcin(RTC_MIN)) * 60;                        /* minutes */
        !           147:        sec += bcd(rtcin(RTC_SEC));                             /* seconds */
        !           148:        sec -= 24*60*60; /* XXX why ??? */
        !           149: 
        !           150: #ifdef notdef
        !           151:        /* XXX off by one? Need to calculate DST on SUNDAY */
        !           152:        /* Perhaps we should have the RTC hold GMT time to save */
        !           153:        /* us the bother of converting. */
        !           154:        yd = yd / 24*60*60;
        !           155:        if ((yd >= DAYST) && ( yd <= DAYEN)) {
        !           156:                sec -= 60*60;
        !           157:        }
        !           158: #endif
        !           159:        sec += tz.tz_minuteswest * 60;
        !           160: 
        !           161:        time.tv_sec = sec;
        !           162: }
        !           163: 
        !           164: #ifdef garbage
        !           165: /*
        !           166:  * Initialze the time of day register, based on the time base which is, e.g.
        !           167:  * from a filesystem.
        !           168:  */
        !           169: test_inittodr(base)
        !           170:        time_t base;
        !           171: {
        !           172: 
        !           173:        outb(IO_RTC,9); /* year    */
        !           174:        printf("%d ",bcd(inb(IO_RTC+1)));
        !           175:        outb(IO_RTC,8); /* month   */
        !           176:        printf("%d ",bcd(inb(IO_RTC+1)));
        !           177:        outb(IO_RTC,7); /* day     */
        !           178:        printf("%d ",bcd(inb(IO_RTC+1)));
        !           179:        outb(IO_RTC,4); /* hour    */
        !           180:        printf("%d ",bcd(inb(IO_RTC+1)));
        !           181:        outb(IO_RTC,2); /* minutes */
        !           182:        printf("%d ",bcd(inb(IO_RTC+1)));
        !           183:        outb(IO_RTC,0); /* seconds */
        !           184:        printf("%d\n",bcd(inb(IO_RTC+1)));
        !           185: 
        !           186:        time.tv_sec = base;
        !           187: }
        !           188: #endif
        !           189: 
        !           190: /*
        !           191:  * Restart the clock.
        !           192:  */
        !           193: resettodr()
        !           194: {
        !           195: }
        !           196: 
        !           197: /*
        !           198:  * Wire clock interrupt in.
        !           199:  */
        !           200: #define V(s)   __CONCAT(V, s)
        !           201: extern V(clk)();
        !           202: enablertclock() {
        !           203:        INTREN(IRQ0);
        !           204:        setidt(ICU_OFFSET+0, &V(clk), SDT_SYS386IGT, SEL_KPL);
        !           205:        splnone();
        !           206: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.