292 lines
7.7 KiB
C
292 lines
7.7 KiB
C
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/*
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* Copyright (c) 1992, 1993, 1996
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* Berkeley Software Design, Inc. All rights reserved.
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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 Berkeley Software
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* Design, Inc.
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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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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* BSDI cmos.c,v 2.3 1996/04/08 19:32:20 bostic Exp
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*
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* $Id: cmos.c,v 1.2 1996/09/18 16:12:24 miff Exp $
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*/
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#include "doscmd.h"
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#define ALARM_ON ((unsigned char) 0x20)
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#define FAST_TIMER ((unsigned char) 0x40)
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#define SEC_SIZE 1
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#define MIN_SIZE 60
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#define HOUR_SIZE (MIN_SIZE * 60)
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#define DAY_SIZE (HOUR_SIZE * 24)
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#define YEAR_DAY 365
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#define SEC_MS 1000000
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#define FAST_TICK_BSD 0x3D00
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#define Jan 31
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#define Feb 28
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#define Mar 31
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#define Apr 30
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#define May 31
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#define Jun 30
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#define Jul 31
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#define Aug 31
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#define Sep 31
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#define Oct 31
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#define Nov 30
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#define Dec 31
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static unsigned char cmos_last_port_70 = 0;
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static unsigned char cmos_data[0x40] = {
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0x00, /* 0x00 Current Second */
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0x00, /* 0x01 Alarm Second */
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0x00, /* 0x02 Current minute */
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0x00, /* 0x03 Alarm minute */
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0x00, /* 0x04 Current hour */
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0x00, /* 0x05 Alarm hour */
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0x00, /* 0x06 Current week day */
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0x00, /* 0x07 Current day */
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0x00, /* 0x08 Current month */
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0x00, /* 0x09 Current year */
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0x26, /* 0x0A Status register A */
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0x02, /* 0x0B Status register B */
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0x00, /* 0x0C Status register C */
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0x80, /* 0x0D Status register D */
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0x00, /* 0x0E Diagnostic status */
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0x00, /* 0x0F Shutdown Code */
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0x00, /* 0x10 Drive types (1 FDHD disk) */
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0x00, /* 0x11 Fixed disk 0 type */
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0x00, /* 0x12 Fixed disk 1 type */
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0x00,
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0x00, /* Installed equipment */
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};
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int day_in_year [12] = {
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0, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
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};
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/* consumed by dos.c */
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time_t delta_clock = 0;
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/* locals */
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static int fast_delta_uclock;
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static struct timeval fast_clock;
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static int fast_tick;
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static struct timeval glob_clock;
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static int cmos_alarm_time = 0;
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static int cmos_alarm_daytime = 0;
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static inline int
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day_in_mon_year (mon, year)
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{
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return day_in_year[mon] + (mon > 2 && (year % 4 == 0));
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}
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static inline int
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to_BCD (int n)
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{
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n &= 0xFF;
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return n%10 + ((n/10)<<4);
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}
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static inline int
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from_BCD (int n)
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{
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n &= 0xFF;
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return (n & 0xF) + (n >> 4) * 10;
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}
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/*
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** inb() from clock ports.
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**
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** 0x70 is scratchpad/register select
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** 0x71 is data
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*/
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static unsigned char
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cmos_inb(int portnum)
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{
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unsigned char ret_val;
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int cmos_reg;
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struct timezone tz;
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struct tm tm;
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time_t now;
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switch (portnum) {
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case 0x70:
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ret_val = cmos_last_port_70;
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break;
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case 0x71:
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cmos_reg = cmos_last_port_70 & 0x3f;
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if (cmos_reg < 0xa) {
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gettimeofday(&glob_clock, &tz);
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now = glob_clock.tv_sec + delta_clock;
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tm = *localtime(&now);
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}
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switch (cmos_reg) {
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case 0:
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ret_val = to_BCD(tm.tm_sec);
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break;
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case 2:
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ret_val = to_BCD(tm.tm_min);
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break;
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case 4:
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ret_val = to_BCD(tm.tm_hour);
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break;
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case 6:
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ret_val = to_BCD(tm.tm_wday);
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break;
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case 7:
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ret_val = to_BCD(tm.tm_mday);
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break;
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case 8:
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ret_val = to_BCD(tm.tm_mon + 1);
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break;
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case 9:
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ret_val = to_BCD((tm.tm_year + 1900) % 100);
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break;
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default:
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ret_val = cmos_data[cmos_reg];
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break;
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}
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break;
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}
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return (ret_val);
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}
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static void
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cmos_outb(int portnum, unsigned char byte)
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{
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int cmos_reg;
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int year;
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int time00;
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struct timezone tz;
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struct tm tm;
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time_t now;
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switch (portnum) {
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case 0x70:
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cmos_last_port_70 = byte;
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break;
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case 0x71:
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cmos_reg = cmos_last_port_70 & 0x3f;
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if (cmos_reg < 0xa) {
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gettimeofday(&glob_clock, &tz);
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now = glob_clock.tv_sec + delta_clock;
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tm = *localtime(&now);
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}
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switch (cmos_reg) {
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case 0:
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delta_clock += SEC_SIZE * (from_BCD(byte) - tm.tm_sec);
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break;
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case 1:
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cmos_alarm_daytime +=
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SEC_SIZE * (from_BCD(byte) - from_BCD(cmos_data[1]));
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break;
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case 2:
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delta_clock += MIN_SIZE * (from_BCD(byte) - tm.tm_min);
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break;
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case 3:
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cmos_alarm_daytime +=
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MIN_SIZE * (from_BCD(byte) - from_BCD(cmos_data[3]));
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break;
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case 4:
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delta_clock += HOUR_SIZE * (from_BCD(byte) - tm.tm_hour);
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break;
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case 5:
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cmos_alarm_daytime +=
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HOUR_SIZE * (from_BCD(byte) - from_BCD(cmos_data[5]));
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break;
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case 7:
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delta_clock += DAY_SIZE * (from_BCD(byte) - tm.tm_mday);
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break;
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case 8:
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delta_clock += DAY_SIZE *
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(day_in_mon_year(from_BCD(byte), tm.tm_year) -
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day_in_mon_year(tm.tm_mon + 1, tm.tm_year));
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break;
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case 9:
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year = from_BCD(byte);
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delta_clock += DAY_SIZE * (YEAR_DAY * (year - tm.tm_year)
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+ (year/4 - tm.tm_year/4));
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break;
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case 0xB:
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cmos_data[0xc] = byte;
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if (byte & ALARM_ON) {
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debug(D_ALWAYS, "Alarm turned on\n");
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time00 = glob_clock.tv_sec + delta_clock -
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(tm.tm_sec + MIN_SIZE * tm.tm_min
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+ HOUR_SIZE * tm.tm_hour);
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cmos_alarm_time = time00 + cmos_alarm_daytime;
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if (cmos_alarm_time < (glob_clock.tv_sec + delta_clock))
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cmos_alarm_time += DAY_SIZE;
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}
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if (byte & FAST_TIMER) {
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debug(D_ALWAYS, "Fast timer turned on\n");
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fast_clock = glob_clock;
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fast_tick = 0;
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}
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break;
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}
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cmos_data[cmos_reg] = byte;
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break;
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}
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}
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void
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cmos_init(void)
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{
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int numflops = 0;
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int checksum = 0;
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int i;
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cmos_data[0x0e] = 0;
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numflops = nfloppies;
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cmos_data[0x10] = (search_floppy(0) << 4) | search_floppy(1);
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if (numflops) /* floppy drives present + numflops */
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cmos_data[0x14] = ((numflops - 1) << 6) | 1;
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cmos_data[0x15] = 0x80; /* base memory 640k */
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cmos_data[0x16] = 0x2;
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for (i=0x10; i<=0x2d; i++)
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checksum += cmos_data[i];
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cmos_data[0x2e] = checksum >>8; /* High byte */
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cmos_data[0x2f] = checksum & 0xFF; /* Low byte */
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cmos_data[0x32] = 0x19; /* Century in BCD ; temporary */
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for (i = 1; i < 12; i++){
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day_in_year[i] += day_in_year[i-1];
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}
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define_input_port_handler(0x70, cmos_inb);
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define_input_port_handler(0x71, cmos_inb);
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define_output_port_handler(0x70, cmos_outb);
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define_output_port_handler(0x71, cmos_outb);
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}
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