time.c revision 113038
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 */ 40 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/sys/boot/ia64/ski/time.c 113038 2003-04-03 21:36:33Z obrien $"); 43 44#include <time.h> 45#include <sys/time.h> 46#include <stand.h> 47 48#include "libski.h" 49 50/* 51// Accurate only for the past couple of centuries; 52// that will probably do. 53// 54// (#defines From FreeBSD 3.2 lib/libc/stdtime/tzfile.h) 55*/ 56 57#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 58#define SECSPERHOUR ( 60*60 ) 59#define SECSPERDAY (24 * SECSPERHOUR) 60 61struct ssc_time { 62 int Year; 63 int Month; 64 int Day; 65 int Hour; 66 int Minute; 67 int Second; 68 int Msec; 69 int Wday; 70}; 71 72time_t 73EfiTimeToUnixTime(struct ssc_time *ETime) 74{ 75 /* 76 // These arrays give the cumulative number of days up to the first of the 77 // month number used as the index (1 -> 12) for regular and leap years. 78 // The value at index 13 is for the whole year. 79 */ 80 static time_t CumulativeDays[2][14] = { 81 {0, 82 0, 83 31, 84 31 + 28, 85 31 + 28 + 31, 86 31 + 28 + 31 + 30, 87 31 + 28 + 31 + 30 + 31, 88 31 + 28 + 31 + 30 + 31 + 30, 89 31 + 28 + 31 + 30 + 31 + 30 + 31, 90 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31, 91 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30, 92 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31, 93 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30, 94 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 }, 95 {0, 96 0, 97 31, 98 31 + 29, 99 31 + 29 + 31, 100 31 + 29 + 31 + 30, 101 31 + 29 + 31 + 30 + 31, 102 31 + 29 + 31 + 30 + 31 + 30, 103 31 + 29 + 31 + 30 + 31 + 30 + 31, 104 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31, 105 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30, 106 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31, 107 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30, 108 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31 }}; 109 110 time_t UTime; 111 int Year; 112 113 ETime->Year += 1900; 114 115 /* 116 // Do a santity check 117 */ 118 if ( ETime->Year < 1998 || ETime->Year > 2099 || 119 ETime->Month == 0 || ETime->Month > 12 || 120 ETime->Day == 0 || ETime->Month > 31 || 121 ETime->Hour > 23 || 122 ETime->Minute > 59 || 123 ETime->Second > 59 ) { 124 return (0); 125 } 126 127 /* 128 // Years 129 */ 130 UTime = 0; 131 for (Year = 1970; Year != ETime->Year; ++Year) { 132 UTime += (CumulativeDays[isleap(Year)][13] * SECSPERDAY); 133 } 134 135 /* 136 // UTime should now be set to 00:00:00 on Jan 1 of the file's year. 137 // 138 // Months 139 */ 140 UTime += (CumulativeDays[isleap(ETime->Year)][ETime->Month] * SECSPERDAY); 141 142 /* 143 // UTime should now be set to 00:00:00 on the first of the file's month and year 144 // 145 // Days -- Don't count the file's day 146 */ 147 UTime += (((ETime->Day > 0) ? ETime->Day-1:0) * SECSPERDAY); 148 149 /* 150 // Hours 151 */ 152 UTime += (ETime->Hour * SECSPERHOUR); 153 154 /* 155 // Minutes 156 */ 157 UTime += (ETime->Minute * 60); 158 159 /* 160 // Seconds 161 */ 162 UTime += ETime->Second; 163 164 return UTime; 165} 166 167time_t 168time(time_t *tloc) 169{ 170 struct ssc_time time; 171 172 ssc((u_int64_t) &time, 0, 0, 0, SSC_GET_RTC); 173 174 return *tloc = EfiTimeToUnixTime(&time); 175} 176