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#include <sys/cdefs.h>
41__FBSDID("$FreeBSD$");
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
60struct 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
71time_t
72EfiTimeToUnixTime(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
166time_t
167time(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}
175