[PATCH 2/3] EmbeddedPkg: import EfiTimeBaseLib

[Leif Lindholm <leif.lindholm@linaro.org>]

Some generic RTC helper functions were broken out from the PL031
library for use with other RTCs in OpenPlatformPkg. Import the code back
here, realigning it with the current state of PL031RealTimeClockLib to
simplify comparisons.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 EmbeddedPkg/Include/Library/EfiTimeBaseLib.h       |  68 ++++++++
 .../Library/EfiTimeBaseLib/EfiTimeBaseLib.c        | 171 +++++++++++++++++++++
 .../Library/EfiTimeBaseLib/EfiTimeBaseLib.inf      |  34 ++++
 3 files changed, 273 insertions(+)
 create mode 100644 EmbeddedPkg/Include/Library/EfiTimeBaseLib.h
 create mode 100644 EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.c
 create mode 100644 EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.inf

diff --git a/EmbeddedPkg/Include/Library/EfiTimeBaseLib.h b/EmbeddedPkg/Include/Library/EfiTimeBaseLib.h
new file mode 100644
index 0000000000..63db6c6eb8
--- /dev/null
+++ b/EmbeddedPkg/Include/Library/EfiTimeBaseLib.h
@@ -0,0 +1,68 @@
+/** @file
+*
+*  Copyright (c) 2016, Hisilicon Limited. All rights reserved.
+*  Copyright (c) 2016, Linaro Limited. All rights reserved.
+*
+*  This program and the accompanying materials
+*  are licensed and made available under the terms and conditions of the BSD License
+*  which accompanies this distribution.  The full text of the license may be found at
+*  http://opensource.org/licenses/bsd-license.php
+*
+*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#ifndef _EFI_TIME_BASE_LIB_H_
+#define _EFI_TIME_BASE_LIB_H_
+
+#include <Uefi/UefiBaseType.h>
+
+// Define EPOCH (1970-JANUARY-01) in the Julian Date representation
+#define EPOCH_JULIAN_DATE                               2440588
+
+// Seconds per unit
+#define SEC_PER_MIN                                     ((UINTN)    60)
+#define SEC_PER_HOUR                                    ((UINTN)  3600)
+#define SEC_PER_DAY                                     ((UINTN) 86400)
+#define SEC_PER_MONTH                                   ((UINTN)  2,592,000)
+#define SEC_PER_YEAR                                    ((UINTN) 31,536,000)
+
+BOOLEAN
+EFIAPI
+IsLeapYear (
+  IN  EFI_TIME  *Time
+  );
+
+BOOLEAN
+EFIAPI
+IsDayValid (
+  IN  EFI_TIME  *Time
+  );
+
+BOOLEAN
+EFIAPI
+IsTimeValid (
+  IN  EFI_TIME  *Time
+  );
+
+/**
+  Converts Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC) to EFI_TIME
+ **/
+VOID
+EFIAPI
+EpochToEfiTime (
+  IN  UINTN     EpochSeconds,
+  OUT EFI_TIME  *Time
+  );
+
+/**
+  Converts EFI_TIME to Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC)
+ **/
+UINTN
+EFIAPI
+EfiTimeToEpoch (
+  IN  EFI_TIME  *Time
+  );
+
+#endif
diff --git a/EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.c b/EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.c
new file mode 100644
index 0000000000..5a6dee6cdd
--- /dev/null
+++ b/EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.c
@@ -0,0 +1,171 @@
+/** @file
+*
+*  Copyright (c) 2016, Hisilicon Limited. All rights reserved.
+*  Copyright (c) 2016, Linaro Limited. All rights reserved.
+*
+*  This program and the accompanying materials
+*  are licensed and made available under the terms and conditions of the BSD License
+*  which accompanies this distribution.  The full text of the license may be found at
+*  http://opensource.org/licenses/bsd-license.php
+*
+*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#include <Uefi/UefiBaseType.h>
+#include <Uefi/UefiSpec.h>
+#include <Library/DebugLib.h>
+#include <Library/EfiTimeBaseLib.h>
+
+/**
+  Converts Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC) to EFI_TIME
+ **/
+VOID
+EFIAPI
+EpochToEfiTime (
+  IN  UINTN     EpochSeconds,
+  OUT EFI_TIME  *Time
+  )
+{
+  UINTN         a;
+  UINTN         b;
+  UINTN         c;
+  UINTN         d;
+  UINTN         g;
+  UINTN         j;
+  UINTN         m;
+  UINTN         y;
+  UINTN         da;
+  UINTN         db;
+  UINTN         dc;
+  UINTN         dg;
+  UINTN         hh;
+  UINTN         mm;
+  UINTN         ss;
+  UINTN         J;
+
+  J  = (EpochSeconds / 86400) + 2440588;
+  j  = J + 32044;
+  g  = j / 146097;
+  dg = j % 146097;
+  c  = (((dg / 36524) + 1) * 3) / 4;
+  dc = dg - (c * 36524);
+  b  = dc / 1461;
+  db = dc % 1461;
+  a  = (((db / 365) + 1) * 3) / 4;
+  da = db - (a * 365);
+  y  = (g * 400) + (c * 100) + (b * 4) + a;
+  m  = (((da * 5) + 308) / 153) - 2;
+  d  = da - (((m + 4) * 153) / 5) + 122;
+
+  Time->Year  = y - 4800 + ((m + 2) / 12);
+  Time->Month = ((m + 2) % 12) + 1;
+  Time->Day   = d + 1;
+
+  ss = EpochSeconds % 60;
+  a  = (EpochSeconds - ss) / 60;
+  mm = a % 60;
+  b = (a - mm) / 60;
+  hh = b % 24;
+
+  Time->Hour        = hh;
+  Time->Minute      = mm;
+  Time->Second      = ss;
+  Time->Nanosecond  = 0;
+
+}
+
+/**
+  Converts EFI_TIME to Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC)
+ **/
+UINTN
+EFIAPI
+EfiTimeToEpoch (
+  IN  EFI_TIME  *Time
+  )
+{
+  UINTN a;
+  UINTN y;
+  UINTN m;
+  UINTN JulianDate;  // Absolute Julian Date representation of the supplied Time
+  UINTN EpochDays;   // Number of days elapsed since EPOCH_JULIAN_DAY
+  UINTN EpochSeconds;
+
+  a = (14 - Time->Month) / 12 ;
+  y = Time->Year + 4800 - a;
+  m = Time->Month + (12*a) - 3;
+
+  JulianDate = Time->Day + ((153*m + 2)/5) + (365*y) + (y/4) - (y/100) + (y/400) - 32045;
+
+  ASSERT (JulianDate >= EPOCH_JULIAN_DATE);
+  EpochDays = JulianDate - EPOCH_JULIAN_DATE;
+
+  EpochSeconds = (EpochDays * SEC_PER_DAY) + ((UINTN)Time->Hour * SEC_PER_HOUR) + (Time->Minute * SEC_PER_MIN) + Time->Second;
+
+  return EpochSeconds;
+}
+
+BOOLEAN
+EFIAPI
+IsLeapYear (
+  IN EFI_TIME   *Time
+  )
+{
+  if (Time->Year % 4 == 0) {
+    if (Time->Year % 100 == 0) {
+      if (Time->Year % 400 == 0) {
+        return TRUE;
+      } else {
+        return FALSE;
+      }
+    } else {
+      return TRUE;
+    }
+  } else {
+    return FALSE;
+  }
+}
+
+BOOLEAN
+EFIAPI
+IsDayValid (
+  IN  EFI_TIME  *Time
+  )
+{
+  STATIC CONST INTN DayOfMonth[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+  if (Time->Day < 1 ||
+      Time->Day > DayOfMonth[Time->Month - 1] ||
+      (Time->Month == 2 && (!IsLeapYear (Time) && Time->Day > 28))
+     ) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+BOOLEAN
+EFIAPI
+IsTimeValid(
+  IN EFI_TIME *Time
+  )
+{
+  // Check the input parameters are within the range specified by UEFI
+  if ((Time->Year   < 2000) ||
+     (Time->Year   > 2099) ||
+     (Time->Month  < 1   ) ||
+     (Time->Month  > 12  ) ||
+     (!IsDayValid (Time)    ) ||
+     (Time->Hour   > 23  ) ||
+     (Time->Minute > 59  ) ||
+     (Time->Second > 59  ) ||
+     (Time->Nanosecond > 999999999) ||
+     (!((Time->TimeZone == EFI_UNSPECIFIED_TIMEZONE) || ((Time->TimeZone >= -1440) && (Time->TimeZone <= 1440)))) ||
+     (Time->Daylight & (~(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT)))
+  ) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
diff --git a/EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.inf b/EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.inf
new file mode 100644
index 0000000000..bd962ae7d2
--- /dev/null
+++ b/EmbeddedPkg/Library/EfiTimeBaseLib/EfiTimeBaseLib.inf
@@ -0,0 +1,34 @@
+#/** @file
+#
+#    Copyright (c) 2016, Hisilicon Limited. All rights reserved.
+#    Copyright (c) 2016, Linaro Limited. All rights reserved.
+#
+#    This program and the accompanying materials
+#    are licensed and made available under the terms and conditions of the BSD License
+#    which accompanies this distribution. The full text of the license may be found at
+#    http://opensource.org/licenses/bsd-license.php
+#
+#    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = EfiTimeBaseLib
+  FILE_GUID                      = B1B07E01-6896-448C-8E75-F0E119ABDF49
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = EfiTimeBaseLib
+
+[Sources.common]
+  EfiTimeBaseLib.c
+
+[Packages]
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  DebugLib
+
+[Pcd]
-- 
2.11.0