sys/boot/ia64/libski/time.c

   1 /*
   2  * Copyright (c) 1999, 2000
   3  * Intel Corporation.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  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  *
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *
  20  *    This product includes software developed by Intel Corporation and
  21  *    its contributors.
  22  *
  23  * 4. Neither the name of Intel Corporation or its contributors may be
  24  *    used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
  28  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
  31  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  37  * THE POSSIBILITY OF SUCH DAMAGE.
  38  *
  39  * $FreeBSD: src/sys/boot/ia64/libski/time.c,v 1.4 2003/09/08 09:11:32 obrien Exp $
  40  * $DragonFly: src/sys/boot/ia64/libski/time.c,v 1.1 2003/11/10 06:08:37 dillon Exp $
  41  */
  42
  43 #include <time.h>
  44 #include <sys/time.h>
  45 #include <stand.h>
  46
  47 #include "libski.h"
  48
  49 /*
  50 // Accurate only for the past couple of centuries;
  51 // that will probably do.
  52 //
  53 // (#defines From FreeBSD 3.2 lib/libc/stdtime/tzfile.h)
  54 */
  55
  56 #define isleap(y)       (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
  57 #define SECSPERHOUR ( 60*60 )
  58 #define SECSPERDAY      (24 * SECSPERHOUR)
  59
  60 struct ssc_time {
  61         int     Year;
  62         int     Month;
  63         int     Day;
  64         int     Hour;
  65         int     Minute;
  66         int     Second;
  67         int     Msec;
  68         int     Wday;
  69 };
  70
  71 time_t
  72 EfiTimeToUnixTime(struct ssc_time *ETime)
  73 {
  74     /*
  75     //  These arrays give the cumulative number of days up to the first of the
  76     //  month number used as the index (1 -> 12) for regular and leap years.
  77     //  The value at index 13 is for the whole year.
  78     */
  79     static time_t CumulativeDays[2][14] = {
  80     {0,
  81      0,
  82      31,
  83      31 + 28,
  84      31 + 28 + 31,
  85      31 + 28 + 31 + 30,
  86      31 + 28 + 31 + 30 + 31,
  87      31 + 28 + 31 + 30 + 31 + 30,
  88      31 + 28 + 31 + 30 + 31 + 30 + 31,
  89      31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
  90      31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
  91      31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
  92      31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
  93      31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 },
  94     {0,
  95      0,
  96      31,
  97      31 + 29,
  98      31 + 29 + 31,
  99      31 + 29 + 31 + 30,
 100      31 + 29 + 31 + 30 + 31,
 101      31 + 29 + 31 + 30 + 31 + 30,
 102      31 + 29 + 31 + 30 + 31 + 30 + 31,
 103      31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
 104      31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
 105      31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
 106      31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
 107      31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 }};
 108
 109     time_t  UTime;
 110     int     Year;
 111
 112     ETime->Year += 1900;
 113
 114     /*
 115     //  Do a santity check
 116     */
 117     if ( ETime->Year  <  1998 || ETime->Year   > 2099 ||
 118          ETime->Month ==    0 || ETime->Month  >   12 ||
 119          ETime->Day   ==    0 || ETime->Month  >   31 ||
 120                                  ETime->Hour   >   23 ||
 121                                  ETime->Minute >   59 ||
 122                                  ETime->Second >   59 ) {
 123         return (0);
 124     }
 125
 126     /*
 127     // Years
 128     */
 129     UTime = 0;
 130     for (Year = 1970; Year != ETime->Year; ++Year) {
 131         UTime += (CumulativeDays[isleap(Year)][13] * SECSPERDAY);
 132     }
 133
 134     /*
 135     // UTime should now be set to 00:00:00 on Jan 1 of the file's year.
 136     //
 137     // Months
 138     */
 139     UTime += (CumulativeDays[isleap(ETime->Year)][ETime->Month] * SECSPERDAY);
 140
 141     /*
 142     // UTime should now be set to 00:00:00 on the first of the file's month and year
 143     //
 144     // Days -- Don't count the file's day
 145     */
 146     UTime += (((ETime->Day > 0) ? ETime->Day-1:0) * SECSPERDAY);
 147
 148     /*
 149     // Hours
 150     */
 151     UTime += (ETime->Hour * SECSPERHOUR);
 152
 153     /*
 154     // Minutes
 155     */
 156     UTime += (ETime->Minute * 60);
 157
 158     /*
 159     // Seconds
 160     */
 161     UTime += ETime->Second;
 162
 163     return UTime;
 164 }
 165
 166 time_t
 167 time(time_t *tloc)
 168 {
 169         struct ssc_time time;
 170
 171         ssc((u_int64_t) &time, 0, 0, 0, SSC_GET_RTC);
 172
 173         return *tloc = EfiTimeToUnixTime(&time);
 174 }