CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c

   1 /** @file
   2   C Run-Time Libraries (CRT) Time Management Routines Wrapper Implementation
   3   for OpenSSL-based Cryptographic Library (used in DXE & RUNTIME).
   4
   5 Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <Uefi.h>
  11 #include <CrtLibSupport.h>
  12 #include <Library/UefiRuntimeServicesTableLib.h>
  13
  14 //
  15 // -- Time Management Routines --
  16 //
  17
  18 #define IsLeap(y)  (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
  19 #define SECSPERMIN   (60)
  20 #define SECSPERHOUR  (60 * 60)
  21 #define SECSPERDAY   (24 * SECSPERHOUR)
  22
  23 //
  24 //  The arrays give the cumulative number of days up to the first of the
  25 //  month number used as the index (1 -> 12) for regular and leap years.
  26 //  The value at index 13 is for the whole year.
  27 //
  28 UINTN  CumulativeDays[2][14] = {
  29   {
  30     0,
  31     0,
  32     31,
  33     31 + 28,
  34     31 + 28 + 31,
  35     31 + 28 + 31 + 30,
  36     31 + 28 + 31 + 30 + 31,
  37     31 + 28 + 31 + 30 + 31 + 30,
  38     31 + 28 + 31 + 30 + 31 + 30 + 31,
  39     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
  40     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
  41     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
  42     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
  43     31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31
  44   },
  45   {
  46     0,
  47     0,
  48     31,
  49     31 + 29,
  50     31 + 29 + 31,
  51     31 + 29 + 31 + 30,
  52     31 + 29 + 31 + 30 + 31,
  53     31 + 29 + 31 + 30 + 31 + 30,
  54     31 + 29 + 31 + 30 + 31 + 30 + 31,
  55     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
  56     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
  57     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
  58     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
  59     31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31
  60   }
  61 };
  62
  63 /* Get the system time as seconds elapsed since midnight, January 1, 1970. */
  64 // INTN time(
  65 //  INTN *timer
  66 //  )
  67 time_t
  68 time (
  69   time_t  *timer
  70   )
  71 {
  72   EFI_STATUS  Status;
  73   EFI_TIME    Time;
  74   time_t      CalTime;
  75   UINTN       Year;
  76
  77   //
  78   // Get the current time and date information
  79   //
  80   Status = gRT->GetTime (&Time, NULL);
  81   if (EFI_ERROR (Status) || (Time.Year < 1970)) {
  82     return 0;
  83   }
  84
  85   //
  86   // Years Handling
  87   // UTime should now be set to 00:00:00 on Jan 1 of the current year.
  88   //
  89   for (Year = 1970, CalTime = 0; Year != Time.Year; Year++) {
  90     CalTime = CalTime + (time_t)(CumulativeDays[IsLeap (Year)][13] * SECSPERDAY);
  91   }
  92
  93   //
  94   // Add in number of seconds for current Month, Day, Hour, Minute, Seconds, and TimeZone adjustment
  95   //
  96   CalTime = CalTime +
  97             (time_t)((Time.TimeZone != EFI_UNSPECIFIED_TIMEZONE) ? (Time.TimeZone * 60) : 0) +
  98             (time_t)(CumulativeDays[IsLeap (Time.Year)][Time.Month] * SECSPERDAY) +
  99             (time_t)(((Time.Day > 0) ? Time.Day - 1 : 0) * SECSPERDAY) +
 100             (time_t)(Time.Hour * SECSPERHOUR) +
 101             (time_t)(Time.Minute * 60) +
 102             (time_t)Time.Second;
 103
 104   if (timer != NULL) {
 105     *timer = CalTime;
 106   }
 107
 108   return CalTime;
 109 }
 110
 111 //
 112 // Convert a time value from type time_t to struct tm.
 113 //
 114 struct tm *
 115 gmtime (
 116   const time_t  *timer
 117   )
 118 {
 119   struct tm  *GmTime;
 120   UINT16     DayNo;
 121   UINT16     DayRemainder;
 122   time_t     Year;
 123   time_t     YearNo;
 124   UINT16     TotalDays;
 125   UINT16     MonthNo;
 126
 127   if (timer == NULL) {
 128     return NULL;
 129   }
 130
 131   GmTime = malloc (sizeof (struct tm));
 132   if (GmTime == NULL) {
 133     return NULL;
 134   }
 135
 136   ZeroMem ((VOID *)GmTime, (UINTN)sizeof (struct tm));
 137
 138   DayNo        = (UINT16)(*timer / SECSPERDAY);
 139   DayRemainder = (UINT16)(*timer % SECSPERDAY);
 140
 141   GmTime->tm_sec  = (int)(DayRemainder % SECSPERMIN);
 142   GmTime->tm_min  = (int)((DayRemainder % SECSPERHOUR) / SECSPERMIN);
 143   GmTime->tm_hour = (int)(DayRemainder / SECSPERHOUR);
 144   GmTime->tm_wday = (int)((DayNo + 4) % 7);
 145
 146   for (Year = 1970, YearNo = 0; DayNo > 0; Year++) {
 147     TotalDays = (UINT16)(IsLeap (Year) ? 366 : 365);
 148     if (DayNo >= TotalDays) {
 149       DayNo = (UINT16)(DayNo - TotalDays);
 150       YearNo++;
 151     } else {
 152       break;
 153     }
 154   }
 155
 156   GmTime->tm_year = (int)(YearNo + (1970 - 1900));
 157   GmTime->tm_yday = (int)DayNo;
 158
 159   for (MonthNo = 12; MonthNo > 1; MonthNo--) {
 160     if (DayNo >= CumulativeDays[IsLeap (Year)][MonthNo]) {
 161       DayNo = (UINT16)(DayNo - (UINT16)(CumulativeDays[IsLeap (Year)][MonthNo]));
 162       break;
 163     }
 164   }
 165
 166   GmTime->tm_mon  = (int)MonthNo - 1;
 167   GmTime->tm_mday = (int)DayNo + 1;
 168
 169   GmTime->tm_isdst  = 0;
 170   GmTime->tm_gmtoff = 0;
 171   GmTime->tm_zone   = NULL;
 172
 173   return GmTime;
 174 }