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