1 /** @file
2 Adjust Default System Time.
3
4 Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
5
6 SPDX-License-Identifier: BSD-2-Clause-Patent
7
8 --*/
9
10 #include <PlatformDxe.h>
11
12 //
13 // Date and time initial values.
14 // They are used if the RTC values are invalid during driver initialization
15 //
16 #define RTC_INIT_SECOND 0
17 #define RTC_INIT_MINUTE 0
18 #define RTC_INIT_HOUR 0
19
20 CHAR16 mBiosReleaseDate[20];
21
22 /**
23 Convert a single character to number.
24 It assumes the input Char is in the scope of L'0' ~ L'9' and L'A' ~ L'F'
25
26 @param Char The input char which need to change to a hex number.
27
28 **/
29 UINTN
CharToUint(IN CHAR16 Char)30 CharToUint (
31 IN CHAR16 Char
32 )
33 {
34 if ((Char >= L'0') && (Char <= L'9')) {
35 return (UINTN) (Char - L'0');
36 }
37
38 if ((Char >= L'A') && (Char <= L'F')) {
39 return (UINTN) (Char - L'A' + 0xA);
40 }
41
42 ASSERT (FALSE);
43 return 0;
44 }
45
46 /**
47 See if YEAR field of a variable of EFI_TIME type is correct.
48
49 @param Time The time to be checked.
50
51 @retval EFI_INVALID_PARAMETER Some fields of Time are not correct.
52 @retval EFI_SUCCESS Time is a valid EFI_TIME variable.
53
54 **/
55 EFI_STATUS
CheckRtcTimeFields(IN EFI_TIME * Time)56 CheckRtcTimeFields (
57 IN EFI_TIME *Time
58 )
59 {
60 UINT16 YearBuilt;
61
62 YearBuilt = (UINT16)(CharToUint(mBiosReleaseDate[8])*10 + CharToUint(mBiosReleaseDate[9]) + 2000);
63
64 if ((Time->Year) < YearBuilt) {
65 return EFI_INVALID_PARAMETER;
66 }
67
68 return EFI_SUCCESS;
69 }
70
71 /**
72 ExitPmAuth Protocol notification event handler, which set initial system time to be
73 the time when BIOS was built.
74
75 @param[in] Event Event whose notification function is being invoked.
76 @param[in] Context Pointer to the notification function's context.
77
78 **/
79 VOID
80 EFIAPI
AdjustDefaultRtcTimeCallback(IN EFI_EVENT Event,IN VOID * Context)81 AdjustDefaultRtcTimeCallback (
82 IN EFI_EVENT Event,
83 IN VOID *Context
84 )
85 {
86 EFI_STATUS Status;
87 EFI_TIME EfiTime;
88 CHAR16 BiosVersion[60];
89 CHAR16 BiosReleaseTime[20];
90 //
91 // Get BIOS built time from Bios-ID.
92 //
93
94 SetMem(BiosVersion, sizeof(BiosVersion), 0);
95 SetMem(mBiosReleaseDate, sizeof(mBiosReleaseDate), 0);
96 SetMem(BiosReleaseTime, sizeof(BiosReleaseTime), 0);
97
98 Status = GetBiosVersionDateTime (BiosVersion, mBiosReleaseDate, BiosReleaseTime);
99 ASSERT_EFI_ERROR(Status);
100 if (EFI_ERROR (Status)) {
101 return;
102 }
103
104 //
105 // Get current RTC time.
106 //
107 Status = gRT->GetTime (&EfiTime, NULL);
108
109 //
110 // Validate RTC time fields
111 //
112 Status = CheckRtcTimeFields (&EfiTime);
113
114 if (EFI_ERROR (Status)) {
115 //
116 // Date such as Dec 28th of 2015
117 //
118 // Month
119 // BiosReleaseDate[0] = '1';
120 // BiosReleaseDate[1] = '2';
121 //
122 // Day
123 // BiosReleaseDate[3] = '2';
124 // BiosReleaseDate[4] = '8';
125 //
126 //
127 // Year
128 //
129 // BiosReleaseDate[6] = '2';
130 // BiosReleaseDate[7] = '0';
131 // BiosReleaseDate[8] = '1'
132 // BiosReleaseDate[9] = '5';
133
134 EfiTime.Second = RTC_INIT_SECOND;
135 EfiTime.Minute = RTC_INIT_MINUTE;
136 EfiTime.Hour = RTC_INIT_HOUR;
137 EfiTime.Day = (UINT8)(CharToUint(mBiosReleaseDate[3])*10 + CharToUint(mBiosReleaseDate[4]));
138 EfiTime.Month = (UINT8)(CharToUint(mBiosReleaseDate[0])*10 + CharToUint(mBiosReleaseDate[1]));
139 EfiTime.Year = (UINT16)(CharToUint(mBiosReleaseDate[8])*10 + CharToUint(mBiosReleaseDate[9]) + 2000);
140 EfiTime.Nanosecond = 0;
141 EfiTime.TimeZone = EFI_UNSPECIFIED_TIMEZONE;
142 EfiTime.Daylight = 1;
143
144 DEBUG ((EFI_D_INFO, "Day:%d Month:%d Year:%d \n", (UINT32)EfiTime.Day, (UINT32)EfiTime.Month, (UINT32)EfiTime.Year));
145
146 //
147 // Reset time value according to new RTC configuration
148 //
149 Status = gRT->SetTime (&EfiTime);
150 ASSERT_EFI_ERROR(Status);
151 }
152
153 return;
154 }
155