usr.bin/doscmd/cmos.c

   1 /*
   2  * Copyright (c) 1992, 1993, 1996
   3  *      Berkeley Software Design, Inc.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Berkeley Software
  16  *      Design, Inc.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  *      BSDI cmos.c,v 2.3 1996/04/08 19:32:20 bostic Exp
  31  *
  32  * $FreeBSD: src/usr.bin/doscmd/cmos.c,v 1.2.2.2 2002/04/25 11:04:50 tg Exp $
  33  * $DragonFly: src/usr.bin/doscmd/cmos.c,v 1.2 2003/06/17 04:29:25 dillon Exp $
  34  */
  35
  36 #include "doscmd.h"
  37
  38 #define ALARM_ON     ((unsigned char) 0x20)
  39 #define FAST_TIMER   ((unsigned char) 0x40)
  40 #define SEC_SIZE     1
  41 #define MIN_SIZE     60
  42 #define HOUR_SIZE    (MIN_SIZE * 60)
  43 #define DAY_SIZE     (HOUR_SIZE * 24)
  44 #define YEAR_DAY     365
  45
  46 #define SEC_MS 1000000
  47 #define FAST_TICK_BSD 0x3D00
  48
  49 #define Jan 31
  50 #define Feb 28
  51 #define Mar 31
  52 #define Apr 30
  53 #define May 31
  54 #define Jun 30
  55 #define Jul 31
  56 #define Aug 31
  57 #define Sep 31
  58 #define Oct 31
  59 #define Nov 30
  60 #define Dec 31
  61
  62 static unsigned char cmos_last_port_70 = 0;
  63 static unsigned char cmos_data[0x40] = {
  64     0x00,                /* 0x00 Current Second */
  65     0x00,                /* 0x01 Alarm Second */
  66     0x00,                /* 0x02 Current minute */
  67     0x00,                /* 0x03 Alarm minute */
  68     0x00,                /* 0x04 Current hour */
  69     0x00,                /* 0x05 Alarm hour */
  70     0x00,                /* 0x06 Current week day */
  71     0x00,                /* 0x07 Current day */
  72     0x00,                /* 0x08 Current month */
  73     0x00,                /* 0x09 Current year */
  74     0x26,                /* 0x0A Status register A */
  75     0x02,                /* 0x0B Status register B */
  76     0x00,                /* 0x0C Status register C */
  77     0x80,                /* 0x0D Status register D */
  78     0x00,                /* 0x0E Diagnostic status */
  79     0x00,                /* 0x0F Shutdown Code */
  80     0x00,                /* 0x10 Drive types (1 FDHD disk) */
  81     0x00,                /* 0x11 Fixed disk 0 type */
  82     0x00,                /* 0x12 Fixed disk 1 type */
  83     0x00,
  84     0x00,                /* Installed equipment */
  85 };
  86
  87 int day_in_year [12] = {
  88     0, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
  89 };
  90
  91 /* consumed by dos.c */
  92 time_t                  delta_clock = 0;
  93
  94 /* locals */
  95 static struct timeval   fast_clock;
  96 static int              fast_tick;
  97
  98 static struct timeval   glob_clock;
  99 static int              cmos_alarm_time = 0;
 100 static int              cmos_alarm_daytime = 0;
 101
 102 static inline int
 103 day_in_mon_year(int mon, int year)
 104 {
 105     return day_in_year[mon] + (mon > 2 && (year % 4 == 0));
 106 }
 107
 108 static inline int
 109 to_BCD (int n)
 110 {
 111     n &= 0xFF;
 112     return n%10 + ((n/10)<<4);
 113 }
 114
 115 static inline int
 116 from_BCD (int n)
 117 {
 118     n &= 0xFF;
 119     return (n & 0xF) + (n >> 4) * 10;
 120 }
 121
 122 /*
 123 ** inb() from clock ports.
 124 **
 125 ** 0x70 is scratchpad/register select
 126 ** 0x71 is data
 127 */
 128 static unsigned char
 129 cmos_inb(int portnum)
 130 {
 131     unsigned char ret_val = 0;
 132     int cmos_reg;
 133     struct timezone tz;
 134     struct tm tm = { .tm_sec = 0 };
 135     time_t now;
 136
 137     switch (portnum) {
 138     case 0x70:
 139         ret_val = cmos_last_port_70;
 140         break;
 141     case 0x71:
 142         cmos_reg = cmos_last_port_70 & 0x3f;
 143         if (cmos_reg < 0xa) {
 144             gettimeofday(&glob_clock, &tz);
 145             now = glob_clock.tv_sec + delta_clock;
 146             tm = *localtime(&now);
 147         }
 148         switch (cmos_reg) {
 149         case 0:
 150             ret_val = to_BCD(tm.tm_sec);
 151             break;
 152         case 2:
 153             ret_val = to_BCD(tm.tm_min);
 154             break;
 155         case 4:
 156             ret_val = to_BCD(tm.tm_hour);
 157             break;
 158         case 6:
 159             ret_val = to_BCD(tm.tm_wday);
 160             break;
 161         case 7:
 162             ret_val = to_BCD(tm.tm_mday);
 163             break;
 164         case 8:
 165             ret_val = to_BCD(tm.tm_mon + 1);
 166             break;
 167         case 9:
 168             ret_val = to_BCD((tm.tm_year + 1900) % 100);
 169             break;
 170         default:
 171             ret_val = cmos_data[cmos_reg];
 172             break;
 173         }
 174         break;
 175     }
 176     return (ret_val);
 177 }
 178
 179 static void
 180 cmos_outb(int portnum, unsigned char byte)
 181 {
 182     int cmos_reg;
 183     int year;
 184     int time00;
 185     struct timezone tz;
 186     struct tm tm = { .tm_sec = 0 };
 187     time_t now;
 188
 189     switch (portnum) {
 190     case 0x70:
 191         cmos_last_port_70 = byte;
 192         break;
 193     case 0x71:
 194         cmos_reg = cmos_last_port_70 & 0x3f;
 195         if (cmos_reg < 0xa) {
 196             gettimeofday(&glob_clock, &tz);
 197             now = glob_clock.tv_sec + delta_clock;
 198             tm = *localtime(&now);
 199         }
 200         switch (cmos_reg) {
 201         case 0:
 202             delta_clock += SEC_SIZE * (from_BCD(byte) - tm.tm_sec);
 203             break;
 204         case 1:
 205             cmos_alarm_daytime +=
 206                 SEC_SIZE * (from_BCD(byte) - from_BCD(cmos_data[1]));
 207             break;
 208         case 2:
 209             delta_clock += MIN_SIZE * (from_BCD(byte) - tm.tm_min);
 210             break;
 211         case 3:
 212             cmos_alarm_daytime +=
 213                 MIN_SIZE * (from_BCD(byte) - from_BCD(cmos_data[3]));
 214             break;
 215         case 4:
 216             delta_clock += HOUR_SIZE * (from_BCD(byte) - tm.tm_hour);
 217             break;
 218         case 5:
 219             cmos_alarm_daytime +=
 220                 HOUR_SIZE * (from_BCD(byte) - from_BCD(cmos_data[5]));
 221             break;
 222         case 7:
 223             delta_clock += DAY_SIZE * (from_BCD(byte) - tm.tm_mday);
 224             break;
 225         case 8:
 226             delta_clock += DAY_SIZE *
 227                 (day_in_mon_year(from_BCD(byte), tm.tm_year) -
 228                  day_in_mon_year(tm.tm_mon + 1, tm.tm_year));
 229             break;
 230         case 9:
 231             year = from_BCD(byte);
 232             delta_clock += DAY_SIZE * (YEAR_DAY * (year - tm.tm_year)
 233                                        + (year/4 - tm.tm_year/4));
 234             break;
 235         case 0xB:
 236             cmos_data[0xc] = byte;
 237             if (byte & ALARM_ON) {
 238                 debug(D_ALWAYS, "Alarm turned on\n");
 239                 time00 = glob_clock.tv_sec + delta_clock -
 240                     (tm.tm_sec + MIN_SIZE * tm.tm_min
 241                      + HOUR_SIZE * tm.tm_hour);
 242                 cmos_alarm_time = time00 + cmos_alarm_daytime;
 243                 if (cmos_alarm_time < (glob_clock.tv_sec + delta_clock))
 244                     cmos_alarm_time += DAY_SIZE;
 245             }
 246             if (byte & FAST_TIMER) {
 247                 debug(D_ALWAYS, "Fast timer turned on\n");
 248                 fast_clock = glob_clock;
 249                 fast_tick = 0;
 250             }
 251             break;
 252         }
 253         cmos_data[cmos_reg] = byte;
 254         break;
 255     }
 256 }
 257
 258
 259 void
 260 cmos_init(void)
 261 {
 262     int numflops = 0;
 263     int checksum = 0;
 264     int i;
 265
 266     cmos_data[0x0e] = 0;
 267
 268     numflops = nfloppies;
 269     cmos_data[0x10] = (search_floppy(0) << 4) | search_floppy(1);
 270
 271     if (numflops)                       /* floppy drives present + numflops */
 272         cmos_data[0x14] = ((numflops - 1) << 6) | 1;
 273
 274     cmos_data[0x15] = 0x80;             /* base memory 640k */
 275     cmos_data[0x16] = 0x2;
 276     for (i=0x10; i<=0x2d; i++)
 277         checksum += cmos_data[i];
 278     cmos_data[0x2e] = checksum >>8;     /* High byte */
 279     cmos_data[0x2f] = checksum & 0xFF;  /* Low    byte */
 280
 281     cmos_data[0x32] = 0x19;             /* Century in BCD ; temporary */
 282
 283     for (i = 1; i < 12; i++){
 284         day_in_year[i] += day_in_year[i-1];
 285     }
 286
 287     define_input_port_handler(0x70, cmos_inb);
 288     define_input_port_handler(0x71, cmos_inb);
 289     define_output_port_handler(0x70, cmos_outb);
 290     define_output_port_handler(0x71, cmos_outb);
 291 }