Vlv2TbltDevicePkg/PlatformDxe/Rtc.c

   1 /** @file
   2   Adjust Default System Time.
   3
   4   Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
   5
   6   This program and the accompanying materials are licensed and made available under
   7   the terms and conditions of the BSD License that accompanies this distribution.
   8   The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php.
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 --*/
  15
  16 #include <PlatformDxe.h>
  17
  18 //
  19 // Date and time initial values.
  20 // They are used if the RTC values are invalid during driver initialization
  21 //
  22 #define RTC_INIT_SECOND 0
  23 #define RTC_INIT_MINUTE 0
  24 #define RTC_INIT_HOUR   0
  25
  26 CHAR16  mBiosReleaseDate[20];
  27
  28 /**
  29   Convert a single character to number.
  30   It assumes the input Char is in the scope of L'0' ~ L'9' and L'A' ~ L'F'
  31
  32   @param Char    The input char which need to change to a hex number.
  33
  34 **/
  35 UINTN
  36 CharToUint (
  37   IN CHAR16                           Char
  38   )
  39 {
  40   if ((Char >= L'0') && (Char <= L'9')) {
  41     return (UINTN) (Char - L'0');
  42   }
  43
  44   if ((Char >= L'A') && (Char <= L'F')) {
  45     return (UINTN) (Char - L'A' + 0xA);
  46   }
  47
  48   ASSERT (FALSE);
  49   return 0;
  50 }
  51
  52 /**
  53   See if YEAR field of a variable of EFI_TIME type is correct.
  54
  55   @param   Time   The time to be checked.
  56
  57   @retval  EFI_INVALID_PARAMETER  Some fields of Time are not correct.
  58   @retval  EFI_SUCCESS            Time is a valid EFI_TIME variable.
  59
  60 **/
  61 EFI_STATUS
  62 CheckRtcTimeFields (
  63   IN EFI_TIME *Time
  64   )
  65 {
  66   UINT16 YearBuilt;
  67
  68   YearBuilt = (UINT16)(CharToUint(mBiosReleaseDate[8])*10 + CharToUint(mBiosReleaseDate[9]) + 2000);
  69
  70   if ((Time->Year) < YearBuilt) {
  71     return EFI_INVALID_PARAMETER;
  72   }
  73
  74   return EFI_SUCCESS;
  75 }
  76
  77 /**
  78   ExitPmAuth Protocol notification event handler, which set initial system time to be
  79   the time when BIOS was built.
  80
  81   @param[in] Event    Event whose notification function is being invoked.
  82   @param[in] Context  Pointer to the notification function's context.
  83
  84 **/
  85 VOID
  86 EFIAPI
  87 AdjustDefaultRtcTimeCallback (
  88   IN EFI_EVENT        Event,
  89   IN VOID             *Context
  90   )
  91 {
  92   EFI_STATUS      Status;
  93   EFI_TIME        EfiTime;
  94   CHAR16          BiosVersion[60];
  95   CHAR16          BiosReleaseTime[20];
  96   //
  97   // Get BIOS built time from Bios-ID.
  98   //
  99
 100   SetMem(BiosVersion, sizeof(BiosVersion), 0);
 101   SetMem(mBiosReleaseDate, sizeof(mBiosReleaseDate), 0);
 102   SetMem(BiosReleaseTime, sizeof(BiosReleaseTime), 0);
 103
 104   Status = GetBiosVersionDateTime (BiosVersion, mBiosReleaseDate, BiosReleaseTime);
 105   ASSERT_EFI_ERROR(Status);
 106   if (EFI_ERROR (Status)) {
 107     return;
 108   }
 109
 110   //
 111   // Get current RTC time.
 112   //
 113   Status = gRT->GetTime (&EfiTime, NULL);
 114
 115   //
 116   // Validate RTC time fields
 117   //
 118   Status = CheckRtcTimeFields (&EfiTime);
 119
 120   if (EFI_ERROR (Status)) {
 121     //
 122     // Date such as Dec 28th of 2015
 123     //
 124     // Month
 125     // BiosReleaseDate[0] = '1';
 126     // BiosReleaseDate[1] = '2';
 127     //
 128     // Day
 129     // BiosReleaseDate[3] = '2';
 130     // BiosReleaseDate[4] = '8';
 131     //
 132     //
 133     // Year
 134     //
 135     // BiosReleaseDate[6] = '2';
 136     // BiosReleaseDate[7] = '0';
 137     // BiosReleaseDate[8] = '1'
 138     // BiosReleaseDate[9] = '5';
 139
 140     EfiTime.Second = RTC_INIT_SECOND;
 141     EfiTime.Minute = RTC_INIT_MINUTE;
 142     EfiTime.Hour   = RTC_INIT_HOUR;
 143     EfiTime.Day    = (UINT8)(CharToUint(mBiosReleaseDate[3])*10 + CharToUint(mBiosReleaseDate[4]));
 144     EfiTime.Month  = (UINT8)(CharToUint(mBiosReleaseDate[0])*10 + CharToUint(mBiosReleaseDate[1]));
 145     EfiTime.Year   = (UINT16)(CharToUint(mBiosReleaseDate[8])*10 + CharToUint(mBiosReleaseDate[9]) + 2000);
 146     EfiTime.Nanosecond  = 0;
 147     EfiTime.TimeZone = EFI_UNSPECIFIED_TIMEZONE;
 148     EfiTime.Daylight = 1;
 149
 150     DEBUG ((EFI_D_INFO, "Day:%d Month:%d Year:%d \n", (UINT32)EfiTime.Day, (UINT32)EfiTime.Month, (UINT32)EfiTime.Year));
 151
 152     //
 153     // Reset time value according to new RTC configuration
 154     //
 155     Status = gRT->SetTime (&EfiTime);
 156     ASSERT_EFI_ERROR(Status);
 157   }
 158
 159   return;
 160 }