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b4895995 LL |
1 | /** @file\r |
2 | *\r | |
3 | * Copyright (c) 2016, Hisilicon Limited. All rights reserved.\r | |
1d757116 | 4 | * Copyright (c) 2016-2019, Linaro Limited. All rights reserved.\r |
b4895995 | 5 | *\r |
878b807a | 6 | * SPDX-License-Identifier: BSD-2-Clause-Patent\r |
b4895995 LL |
7 | *\r |
8 | **/\r | |
9 | \r | |
10 | #include <Uefi/UefiBaseType.h>\r | |
11 | #include <Uefi/UefiSpec.h>\r | |
12 | #include <Library/DebugLib.h>\r | |
13 | #include <Library/TimeBaseLib.h>\r | |
14 | \r | |
15 | /**\r | |
16 | Converts Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC) to EFI_TIME\r | |
17 | **/\r | |
18 | VOID\r | |
19 | EFIAPI\r | |
20 | EpochToEfiTime (\r | |
21 | IN UINTN EpochSeconds,\r | |
22 | OUT EFI_TIME *Time\r | |
23 | )\r | |
24 | {\r | |
25 | UINTN a;\r | |
26 | UINTN b;\r | |
27 | UINTN c;\r | |
28 | UINTN d;\r | |
29 | UINTN g;\r | |
30 | UINTN j;\r | |
31 | UINTN m;\r | |
32 | UINTN y;\r | |
33 | UINTN da;\r | |
34 | UINTN db;\r | |
35 | UINTN dc;\r | |
36 | UINTN dg;\r | |
37 | UINTN hh;\r | |
38 | UINTN mm;\r | |
39 | UINTN ss;\r | |
40 | UINTN J;\r | |
41 | \r | |
42 | J = (EpochSeconds / 86400) + 2440588;\r | |
43 | j = J + 32044;\r | |
44 | g = j / 146097;\r | |
45 | dg = j % 146097;\r | |
46 | c = (((dg / 36524) + 1) * 3) / 4;\r | |
47 | dc = dg - (c * 36524);\r | |
48 | b = dc / 1461;\r | |
49 | db = dc % 1461;\r | |
50 | a = (((db / 365) + 1) * 3) / 4;\r | |
51 | da = db - (a * 365);\r | |
52 | y = (g * 400) + (c * 100) + (b * 4) + a;\r | |
53 | m = (((da * 5) + 308) / 153) - 2;\r | |
54 | d = da - (((m + 4) * 153) / 5) + 122;\r | |
55 | \r | |
1d757116 | 56 | Time->Year = (UINT16)(y - 4800 + ((m + 2) / 12));\r |
b4895995 | 57 | Time->Month = ((m + 2) % 12) + 1;\r |
1d757116 | 58 | Time->Day = (UINT8)(d + 1);\r |
b4895995 LL |
59 | \r |
60 | ss = EpochSeconds % 60;\r | |
61 | a = (EpochSeconds - ss) / 60;\r | |
62 | mm = a % 60;\r | |
63 | b = (a - mm) / 60;\r | |
64 | hh = b % 24;\r | |
65 | \r | |
1d757116 LL |
66 | Time->Hour = (UINT8)hh;\r |
67 | Time->Minute = (UINT8)mm;\r | |
68 | Time->Second = (UINT8)ss;\r | |
b4895995 LL |
69 | Time->Nanosecond = 0;\r |
70 | \r | |
71 | }\r | |
72 | \r | |
73 | /**\r | |
91c31ff0 | 74 | Calculate Epoch days\r |
b4895995 LL |
75 | **/\r |
76 | UINTN\r | |
77 | EFIAPI\r | |
91c31ff0 | 78 | EfiGetEpochDays (\r |
b4895995 LL |
79 | IN EFI_TIME *Time\r |
80 | )\r | |
81 | {\r | |
82 | UINTN a;\r | |
83 | UINTN y;\r | |
84 | UINTN m;\r | |
85 | UINTN JulianDate; // Absolute Julian Date representation of the supplied Time\r | |
86 | UINTN EpochDays; // Number of days elapsed since EPOCH_JULIAN_DAY\r | |
b4895995 LL |
87 | \r |
88 | a = (14 - Time->Month) / 12 ;\r | |
89 | y = Time->Year + 4800 - a;\r | |
90 | m = Time->Month + (12*a) - 3;\r | |
91 | \r | |
92 | JulianDate = Time->Day + ((153*m + 2)/5) + (365*y) + (y/4) - (y/100) + (y/400) - 32045;\r | |
93 | \r | |
94 | ASSERT (JulianDate >= EPOCH_JULIAN_DATE);\r | |
95 | EpochDays = JulianDate - EPOCH_JULIAN_DATE;\r | |
96 | \r | |
91c31ff0 MA |
97 | return EpochDays;\r |
98 | }\r | |
99 | /**\r | |
100 | Converts EFI_TIME to Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC)\r | |
101 | **/\r | |
c06635ea | 102 | UINTN\r |
91c31ff0 MA |
103 | EFIAPI\r |
104 | EfiTimeToEpoch (\r | |
105 | IN EFI_TIME *Time\r | |
106 | )\r | |
107 | {\r | |
c06635ea LE |
108 | UINTN EpochDays; // Number of days elapsed since EPOCH_JULIAN_DAY\r |
109 | UINTN EpochSeconds;\r | |
91c31ff0 MA |
110 | \r |
111 | EpochDays = EfiGetEpochDays (Time);\r | |
112 | \r | |
b4895995 LL |
113 | EpochSeconds = (EpochDays * SEC_PER_DAY) + ((UINTN)Time->Hour * SEC_PER_HOUR) + (Time->Minute * SEC_PER_MIN) + Time->Second;\r |
114 | \r | |
115 | return EpochSeconds;\r | |
116 | }\r | |
117 | \r | |
91c31ff0 MA |
118 | /**\r |
119 | returns Day of the week [0-6] 0=Sunday\r | |
120 | **/\r | |
121 | UINTN\r | |
122 | EfiTimeToWday (\r | |
123 | IN EFI_TIME *Time\r | |
124 | )\r | |
125 | {\r | |
126 | UINTN EpochDays; // Number of days elapsed since EPOCH_JULIAN_DAY\r | |
127 | \r | |
128 | EpochDays = EfiGetEpochDays (Time);\r | |
129 | \r | |
130 | // 4=1/1/1970 was a Thursday\r | |
131 | \r | |
132 | return (EpochDays + 4) % 7;\r | |
133 | }\r | |
134 | \r | |
b4895995 LL |
135 | BOOLEAN\r |
136 | EFIAPI\r | |
137 | IsLeapYear (\r | |
138 | IN EFI_TIME *Time\r | |
139 | )\r | |
140 | {\r | |
141 | if (Time->Year % 4 == 0) {\r | |
142 | if (Time->Year % 100 == 0) {\r | |
143 | if (Time->Year % 400 == 0) {\r | |
144 | return TRUE;\r | |
145 | } else {\r | |
146 | return FALSE;\r | |
147 | }\r | |
148 | } else {\r | |
149 | return TRUE;\r | |
150 | }\r | |
151 | } else {\r | |
152 | return FALSE;\r | |
153 | }\r | |
154 | }\r | |
155 | \r | |
156 | BOOLEAN\r | |
157 | EFIAPI\r | |
158 | IsDayValid (\r | |
159 | IN EFI_TIME *Time\r | |
160 | )\r | |
161 | {\r | |
162 | STATIC CONST INTN DayOfMonth[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };\r | |
163 | \r | |
164 | if (Time->Day < 1 ||\r | |
165 | Time->Day > DayOfMonth[Time->Month - 1] ||\r | |
166 | (Time->Month == 2 && (!IsLeapYear (Time) && Time->Day > 28))\r | |
167 | ) {\r | |
168 | return FALSE;\r | |
169 | }\r | |
170 | \r | |
171 | return TRUE;\r | |
172 | }\r | |
173 | \r | |
174 | BOOLEAN\r | |
175 | EFIAPI\r | |
176 | IsTimeValid(\r | |
177 | IN EFI_TIME *Time\r | |
178 | )\r | |
179 | {\r | |
180 | // Check the input parameters are within the range specified by UEFI\r | |
181 | if ((Time->Year < 2000) ||\r | |
182 | (Time->Year > 2099) ||\r | |
183 | (Time->Month < 1 ) ||\r | |
184 | (Time->Month > 12 ) ||\r | |
185 | (!IsDayValid (Time) ) ||\r | |
186 | (Time->Hour > 23 ) ||\r | |
187 | (Time->Minute > 59 ) ||\r | |
188 | (Time->Second > 59 ) ||\r | |
189 | (Time->Nanosecond > 999999999) ||\r | |
190 | (!((Time->TimeZone == EFI_UNSPECIFIED_TIMEZONE) || ((Time->TimeZone >= -1440) && (Time->TimeZone <= 1440)))) ||\r | |
191 | (Time->Daylight & (~(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT)))\r | |
192 | ) {\r | |
193 | return FALSE;\r | |
194 | }\r | |
195 | \r | |
196 | return TRUE;\r | |
197 | }\r |