Vlv2TbltDevicePkg/PlatformDxe/Rtc.c

   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
  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
  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
  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 }