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PcAtChipsetPkg/PcRtc: Fix a Y2K bug 

The original driver cannot handle the case when system time runs from 1999/12/31 23:59:59
to 2000/1/1 0:0:0.
A simple test to set system time to 1999/12/31 23:59:59 can expose this bug.
The patch limits the driver to only support year in 100 range and decide the century value based
on the supporting range: Century either equals to PcdMinimalYear / 100 or equals to PcdMinimalYear / 100 + 1.

The patch passed the Y2K test.
However with year range [1998, 2097], when system time is 2097/12/31 23:59:59,
the next second system time will become 1998/1/1 0:0:0. I think it's a acceptable limitation.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17624 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Ruiyu Ni 2015-06-11 07:14:18 +00:00 committed by niruiyu
parent e63ec1beac
commit fe32096778
3 changed files with 27 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
PcAtChipsetPkg/PcAtChipsetPkg.dec
View File

@ -123,7 +123,8 @@
## This PCD specifies the maximal valid year in RTC.
# @Prompt Maximal valid year in RTC.
gPcAtChipsetPkgTokenSpaceGuid.PcdMaximalValidYear|2099|UINT16|0x0000000E
# @Expression gPcAtChipsetPkgTokenSpaceGuid.PcdMaximalValidYear < gPcAtChipsetPkgTokenSpaceGuid.PcdMinimalValidYear + 100
gPcAtChipsetPkgTokenSpaceGuid.PcdMaximalValidYear|2097|UINT16|0x0000000E
[PcdsFixedAtBuild, PcdsPatchableInModule]
## Defines the ACPI register set base address.
@ -168,4 +169,4 @@
gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPortBaseAddressMask |0xFFFE|UINT16|0x00000018
[UserExtensions.TianoCore."ExtraFiles"]
PcAtChipsetPkgExtra.uni
PcAtChipsetPkgExtra.uni

55
PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.c
View File

@ -100,7 +100,6 @@ PcRtcInit (
RTC_REGISTER_A RegisterA;
RTC_REGISTER_B RegisterB;
RTC_REGISTER_D RegisterD;
UINT8 Century;
EFI_TIME Time;
UINTN DataSize;
UINT32 TimerVar;
@ -163,8 +162,6 @@ PcRtcInit (
Time.Month = RtcRead (RTC_ADDRESS_MONTH);
Time.Year = RtcRead (RTC_ADDRESS_YEAR);
Century = RtcRead (RTC_ADDRESS_CENTURY);
//
// Set RTC configuration after get original time
// The value of bit AIE should be reserved.
@ -201,7 +198,7 @@ PcRtcInit (
//
// Validate time fields
//
Status = ConvertRtcTimeToEfiTime (&Time, Century, RegisterB);
Status = ConvertRtcTimeToEfiTime (&Time, RegisterB);
if (!EFI_ERROR (Status)) {
Status = RtcTimeFieldsValid (&Time);
}
@ -218,7 +215,7 @@ PcRtcInit (
Time.Hour = RTC_INIT_HOUR;
Time.Day = RTC_INIT_DAY;
Time.Month = RTC_INIT_MONTH;
Time.Year = RTC_INIT_YEAR;
Time.Year = PcdGet16 (PcdMinimalValidYear);
Time.Nanosecond = 0;
Time.TimeZone = EFI_UNSPECIFIED_TIMEZONE;
Time.Daylight = 0;
@ -251,7 +248,7 @@ PcRtcInit (
Time.Hour = RTC_INIT_HOUR;
Time.Day = RTC_INIT_DAY;
Time.Month = RTC_INIT_MONTH;
Time.Year = RTC_INIT_YEAR;
Time.Year = PcdGet16 (PcdMinimalValidYear);
Time.Nanosecond = 0;
Time.TimeZone = Global->SavedTimeZone;
Time.Daylight = Global->Daylight;;
@ -272,8 +269,8 @@ PcRtcInit (
}
return EFI_DEVICE_ERROR;
}
ConvertEfiTimeToRtcTime (&Time, RegisterB, &Century);
ConvertEfiTimeToRtcTime (&Time, RegisterB);
//
// Set the Y/M/D info to variable as it has no corresponding hw registers.
@ -343,7 +340,6 @@ PcRtcGetTime (
{
EFI_STATUS Status;
RTC_REGISTER_B RegisterB;
UINT8 Century;
//
// Check parameters for null pointer
@ -383,8 +379,6 @@ PcRtcGetTime (
Time->Month = RtcRead (RTC_ADDRESS_MONTH);
Time->Year = RtcRead (RTC_ADDRESS_YEAR);
Century = RtcRead (RTC_ADDRESS_CENTURY);
//
// Release RTC Lock.
//
@ -401,7 +395,7 @@ PcRtcGetTime (
//
// Make sure all field values are in correct range
//
Status = ConvertRtcTimeToEfiTime (Time, Century, RegisterB);
Status = ConvertRtcTimeToEfiTime (Time, RegisterB);
if (!EFI_ERROR (Status)) {
Status = RtcTimeFieldsValid (Time);
}
@ -447,7 +441,6 @@ PcRtcSetTime (
EFI_STATUS Status;
EFI_TIME RtcTime;
RTC_REGISTER_B RegisterB;
UINT8 Century;
UINT32 TimerVar;
if (Time == NULL) {
@ -506,7 +499,7 @@ PcRtcSetTime (
RegisterB.Bits.Set = 1;
RtcWrite (RTC_ADDRESS_REGISTER_B, RegisterB.Data);
ConvertEfiTimeToRtcTime (&RtcTime, RegisterB, &Century);
ConvertEfiTimeToRtcTime (&RtcTime, RegisterB);
RtcWrite (RTC_ADDRESS_SECONDS, RtcTime.Second);
RtcWrite (RTC_ADDRESS_MINUTES, RtcTime.Minute);
@ -514,7 +507,6 @@ PcRtcSetTime (
RtcWrite (RTC_ADDRESS_DAY_OF_THE_MONTH, RtcTime.Day);
RtcWrite (RTC_ADDRESS_MONTH, RtcTime.Month);
RtcWrite (RTC_ADDRESS_YEAR, (UINT8) RtcTime.Year);
RtcWrite (RTC_ADDRESS_CENTURY, Century);
//
// Allow updates of the RTC registers
@ -564,7 +556,6 @@ PcRtcGetWakeupTime (
EFI_STATUS Status;
RTC_REGISTER_B RegisterB;
RTC_REGISTER_C RegisterC;
UINT8 Century;
EFI_TIME RtcTime;
UINTN DataSize;
@ -612,8 +603,6 @@ PcRtcGetWakeupTime (
Time->TimeZone = Global->SavedTimeZone;
Time->Daylight = Global->Daylight;
Century = RtcRead (RTC_ADDRESS_CENTURY);
//
// Get the alarm info from variable
//
@ -644,7 +633,7 @@ PcRtcGetWakeupTime (
//
// Make sure all field values are in correct range
//
Status = ConvertRtcTimeToEfiTime (Time, Century, RegisterB);
Status = ConvertRtcTimeToEfiTime (Time, RegisterB);
if (!EFI_ERROR (Status)) {
Status = RtcTimeFieldsValid (Time);
}
@ -680,7 +669,6 @@ PcRtcSetWakeupTime (
EFI_STATUS Status;
EFI_TIME RtcTime;
RTC_REGISTER_B RegisterB;
UINT8 Century;
EFI_TIME_CAPABILITIES Capabilities;
ZeroMem (&RtcTime, sizeof (RtcTime));
@ -736,7 +724,7 @@ PcRtcSetWakeupTime (
RegisterB.Data = RtcRead (RTC_ADDRESS_REGISTER_B);
if (Enable) {
ConvertEfiTimeToRtcTime (&RtcTime, RegisterB, &Century);
ConvertEfiTimeToRtcTime (&RtcTime, RegisterB);
} else {
//
// if the alarm is disable, record the current setting.
@ -837,7 +825,6 @@ CheckAndConvertBcd8ToDecimal8 (
@param Time On input, the time data read from RTC to convert
On output, the time converted to UEFI format
@param Century Value of century read from RTC.
@param RegisterB Value of Register B of RTC, indicating data mode
and hour format.
@ -848,11 +835,11 @@ CheckAndConvertBcd8ToDecimal8 (
EFI_STATUS
ConvertRtcTimeToEfiTime (
IN OUT EFI_TIME *Time,
IN UINT8 Century,
IN RTC_REGISTER_B RegisterB
)
{
BOOLEAN IsPM;
UINT8 Century;
if ((Time->Hour & 0x80) != 0) {
IsPM = TRUE;
@ -870,14 +857,21 @@ ConvertRtcTimeToEfiTime (
Time->Minute = CheckAndConvertBcd8ToDecimal8 (Time->Minute);
Time->Second = CheckAndConvertBcd8ToDecimal8 (Time->Second);
}
Century = CheckAndConvertBcd8ToDecimal8 (Century);
if (Time->Year == 0xff || Time->Month == 0xff || Time->Day == 0xff ||
Time->Hour == 0xff || Time->Minute == 0xff || Time->Second == 0xff ||
Century == 0xff) {
Time->Hour == 0xff || Time->Minute == 0xff || Time->Second == 0xff) {
return EFI_INVALID_PARAMETER;
}
//
// For minimal/maximum year range [1970, 2069],
// Century is 19 if RTC year >= 70,
// Century is 20 otherwise.
//
Century = (UINT8) (PcdGet16 (PcdMinimalValidYear) / 100);
if (Time->Year < PcdGet16 (PcdMinimalValidYear) % 100) {
Century++;
}
Time->Year = (UINT16) (Century * 100 + Time->Year);
//
@ -1053,14 +1047,11 @@ IsLeapYear (
@param Time On input, the time data read from UEFI to convert
On output, the time converted to RTC format
@param RegisterB Value of Register B of RTC, indicating data mode
@param Century It is set according to EFI_TIME Time.
**/
VOID
ConvertEfiTimeToRtcTime (
IN OUT EFI_TIME *Time,
IN RTC_REGISTER_B RegisterB,
OUT UINT8 *Century
IN RTC_REGISTER_B RegisterB
)
{
BOOLEAN IsPM;
@ -1081,10 +1072,8 @@ ConvertEfiTimeToRtcTime (
}
}
//
// Set the Time/Date/Daylight Savings values.
// Set the Time/Date values.
//
*Century = DecimalToBcd8 ((UINT8) (Time->Year / 100));
Time->Year = (UINT16) (Time->Year % 100);
if (RegisterB.Bits.Dm == 0) {

11
PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcRtc.h
View File

@ -1,7 +1,7 @@
/** @file
Header file for real time clock driver.
Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
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
@ -61,7 +61,6 @@ typedef struct {
#define RTC_ADDRESS_REGISTER_B 11 // R/W
#define RTC_ADDRESS_REGISTER_C 12 // RO
#define RTC_ADDRESS_REGISTER_D 13 // RO
#define RTC_ADDRESS_CENTURY 50 // R/W Range 19..20 Bit 8 is R/W
//
// Date and time initial values.
// They are used if the RTC values are invalid during driver initialization
@ -71,7 +70,6 @@ typedef struct {
#define RTC_INIT_HOUR 0
#define RTC_INIT_DAY 1
#define RTC_INIT_MONTH 1
#define RTC_INIT_YEAR 2001
//
// Register initial values
@ -287,14 +285,11 @@ RtcTimeFieldsValid (
@param Time On input, the time data read from UEFI to convert
On output, the time converted to RTC format
@param RegisterB Value of Register B of RTC, indicating data mode
@param Century It is set according to EFI_TIME Time.
**/
VOID
ConvertEfiTimeToRtcTime (
IN OUT EFI_TIME *Time,
IN RTC_REGISTER_B RegisterB,
OUT UINT8 *Century
IN RTC_REGISTER_B RegisterB
);
@ -308,7 +303,6 @@ ConvertEfiTimeToRtcTime (
@param Time On input, the time data read from RTC to convert
On output, the time converted to UEFI format
@param Century Value of century read from RTC.
@param RegisterB Value of Register B of RTC, indicating data mode
and hour format.
@ -319,7 +313,6 @@ ConvertEfiTimeToRtcTime (
EFI_STATUS
ConvertRtcTimeToEfiTime (
IN OUT EFI_TIME *Time,
IN UINT8 Century,
IN RTC_REGISTER_B RegisterB
);