FreeBSD/Linux Kernel Cross Reference
sys/isa/rtc.h

     /*-
      * 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.
      *
      * 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.
     * 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.
     *
     *      from: @(#)rtc.h 7.1 (Berkeley) 5/12/91
     * $FreeBSD$
     */
    
    #ifndef _I386_ISA_RTC_H_
    #define _I386_ISA_RTC_H_ 1
    
    /*
     * MC146818 RTC Register locations
     */
    
    #define RTC_SEC         0x00    /* seconds */
    #define RTC_SECALRM     0x01    /* seconds alarm */
    #define RTC_MIN         0x02    /* minutes */
    #define RTC_MINALRM     0x03    /* minutes alarm */
    #define RTC_HRS         0x04    /* hours */
    #define RTC_HRSALRM     0x05    /* hours alarm */
    #define RTC_WDAY        0x06    /* week day */
    #define RTC_DAY         0x07    /* day of month */
    #define RTC_MONTH       0x08    /* month of year */
    #define RTC_YEAR        0x09    /* month of year */
    
    #define RTC_STATUSA     0x0a    /* status register A */
    #define  RTCSA_TUP       0x80   /* time update, don't look now */
    #define  RTCSA_RESET     0x70   /* reset divider */
    #define  RTCSA_DIVIDER   0x20   /* divider correct for 32768 Hz */
    #define  RTCSA_8192      0x03   /* 8192 Hz interrupt */
    #define  RTCSA_4096      0x04
    #define  RTCSA_2048      0x05
    #define  RTCSA_1024      0x06   /* default for profiling */
    #define  RTCSA_PROF      RTCSA_1024
    #define  RTC_PROFRATE    1024
    #define  RTCSA_512       0x07
    #define  RTCSA_256       0x08
    #define  RTCSA_128       0x09
    #define  RTCSA_NOPROF    RTCSA_128
    #define  RTC_NOPROFRATE  128
    #define  RTCSA_64        0x0a
    #define  RTCSA_32        0x0b   /* 32 Hz interrupt */
    
    #define RTC_STATUSB     0x0b    /* status register B */
    #define  RTCSB_DST       0x01   /* USA Daylight Savings Time enable */
    #define  RTCSB_24HR      0x02   /* 0 = 12 hours, 1 = 24 hours */
    #define  RTCSB_BCD       0x04   /* 0 = BCD, 1 = Binary coded time */
    #define  RTCSB_SQWE      0x08   /* 1 = output sqare wave at SQW pin */
    #define  RTCSB_UINTR     0x10   /* 1 = enable update-ended interrupt */
    #define  RTCSB_AINTR     0x20   /* 1 = enable alarm interrupt */
    #define  RTCSB_PINTR     0x40   /* 1 = enable periodic clock interrupt */
    #define  RTCSB_HALT      0x80   /* stop clock updates */
    
    #define RTC_INTR        0x0c    /* status register C (R) interrupt source */
    #define  RTCIR_UPDATE    0x10   /* update intr */
    #define  RTCIR_ALARM     0x20   /* alarm intr */
    #define  RTCIR_PERIOD    0x40   /* periodic intr */
    #define  RTCIR_INT       0x80   /* interrupt output signal */
    
    #define RTC_STATUSD     0x0d    /* status register D (R) Lost Power */
    #define  RTCSD_PWR       0x80   /* clock power OK */
    
    #define RTC_DIAG        0x0e    /* status register E - bios diagnostic */
    #define RTCDG_BITS      "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time"
    
    #define RTC_RESET       0x0f    /* status register F - reset code byte */
    #define  RTCRS_RST       0x00           /* normal reset */
    #define  RTCRS_LOAD      0x04           /* load system */
    
    #define RTC_FDISKETTE   0x10    /* diskette drive type in upper/lower nibble */
    #define  RTCFDT_NONE     0              /* none present */
   #define  RTCFDT_360K     0x10           /* 360K */
   #define  RTCFDT_12M      0x20           /* 1.2M */
   #define  RTCFDT_720K     0x30           /* 720K */
   #define  RTCFDT_144M     0x40           /* 1.44M */
   #define  RTCFDT_288M_1   0x50           /* 2.88M, some BIOSes */
   #define  RTCFDT_288M     0x60           /* 2.88M */
   
   #define RTC_BASELO      0x15    /* low byte of basemem size */
   #define RTC_BASEHI      0x16    /* high byte of basemem size */
   #define RTC_EXTLO       0x17    /* low byte of extended mem size */
   #define RTC_EXTHI       0x18    /* low byte of extended mem size */
   
   #define RTC_CENTURY     0x32    /* current century */
   #endif /* _I386_ISA_RTC_H_ */

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