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audk/EmbeddedPkg/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.c

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/** @file
*
* Implement virtual EFI RealTimeClock runtime services.
*
* Coypright (c) 2019, Pete Batard <pete@akeo.ie>
* Copyright (c) 2018, Andrei Warkentin <andrey.warkentin@gmail.com>
* Copyright (c) 2011-2014, ARM Ltd. All rights reserved.
* Copyright (c) 2008-2010, Apple Inc. All rights reserved.
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
* Based on ArmPlatformPkg/Library/PL031RealTimeClockLib/PL031RealTimeClockLib.inf
*
**/
#include <PiDxe.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/IoLib.h>
#include <Library/RealTimeClockLib.h>
#include <Library/TimerLib.h>
#include <Library/TimeBaseLib.h>
#include <Library/UefiRuntimeLib.h>
STATIC CONST CHAR16 mEpochVariableName[] = L"RtcEpochSeconds";
STATIC CONST CHAR16 mTimeZoneVariableName[] = L"RtcTimeZone";
STATIC CONST CHAR16 mDaylightVariableName[] = L"RtcDaylight";
/**
Returns the current time and date information, and the time-keeping capabilities
of the virtual RTC.
@param Time A pointer to storage to receive a snapshot of the current time.
@param Capabilities An optional pointer to a buffer to receive the real time clock
device's capabilities.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_INVALID_PARAMETER Time is NULL.
@retval EFI_DEVICE_ERROR The time could not be retrieved due to hardware error.
**/
EFI_STATUS
EFIAPI
LibGetTime (
OUT EFI_TIME *Time,
OUT EFI_TIME_CAPABILITIES *Capabilities
)
{
EFI_STATUS Status;
INT16 TimeZone;
UINT8 Daylight;
UINT64 Freq;
UINT64 Counter;
UINT64 Remainder;
UINTN EpochSeconds;
UINTN Size;
if (Time == NULL) {
return EFI_INVALID_PARAMETER;
}
// Get the counter frequency
Freq = GetPerformanceCounterProperties (NULL, NULL);
if (Freq == 0) {
return EFI_DEVICE_ERROR;
}
// Get the epoch time from non-volatile storage
Size = sizeof (UINTN);
EpochSeconds = 0;
Status = EfiGetVariable (
(CHAR16 *)mEpochVariableName,
&gEfiCallerIdGuid,
NULL,
&Size,
(VOID *)&EpochSeconds
);
// Fall back to compilation-time epoch if not set
if (EFI_ERROR (Status)) {
ASSERT(Status != EFI_INVALID_PARAMETER);
ASSERT(Status != EFI_BUFFER_TOO_SMALL);
//
// The following is intended to produce a compilation error on build
// environments where BUILD_EPOCH can not be set from inline shell.
// If you are attempting to use this library on such an environment, please
// contact the edk2 mailing list, so we can try to add support for it.
//
EpochSeconds = BUILD_EPOCH;
DEBUG ((
DEBUG_INFO,
"LibGetTime: %s non volatile variable was not found - Using compilation time epoch.\n",
mEpochVariableName
));
}
Counter = GetPerformanceCounter ();
EpochSeconds += DivU64x64Remainder (Counter, Freq, &Remainder);
// Get the current time zone information from non-volatile storage
Size = sizeof (TimeZone);
Status = EfiGetVariable (
(CHAR16 *)mTimeZoneVariableName,
&gEfiCallerIdGuid,
NULL,
&Size,
(VOID *)&TimeZone
);
if (EFI_ERROR (Status)) {
ASSERT(Status != EFI_INVALID_PARAMETER);
ASSERT(Status != EFI_BUFFER_TOO_SMALL);
if (Status != EFI_NOT_FOUND) {
return Status;
}
// The time zone variable does not exist in non-volatile storage, so create it.
Time->TimeZone = EFI_UNSPECIFIED_TIMEZONE;
// Store it
Status = EfiSetVariable (
(CHAR16 *)mTimeZoneVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
Size,
(VOID *)&(Time->TimeZone)
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"LibGetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mTimeZoneVariableName,
Status
));
return Status;
}
} else {
// Got the time zone
Time->TimeZone = TimeZone;
// Check TimeZone bounds: -1440 to 1440 or 2047
if (((Time->TimeZone < -1440) || (Time->TimeZone > 1440))
&& (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE)) {
Time->TimeZone = EFI_UNSPECIFIED_TIMEZONE;
}
// Adjust for the correct time zone
if (Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE) {
EpochSeconds += Time->TimeZone * SEC_PER_MIN;
}
}
// Get the current daylight information from non-volatile storage
Size = sizeof (Daylight);
Status = EfiGetVariable (
(CHAR16 *)mDaylightVariableName,
&gEfiCallerIdGuid,
NULL,
&Size,
(VOID *)&Daylight
);
if (EFI_ERROR (Status)) {
ASSERT(Status != EFI_INVALID_PARAMETER);
ASSERT(Status != EFI_BUFFER_TOO_SMALL);
if (Status != EFI_NOT_FOUND) {
return Status;
}
// The daylight variable does not exist in non-volatile storage, so create it.
Time->Daylight = 0;
// Store it
Status = EfiSetVariable (
(CHAR16 *)mDaylightVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
Size,
(VOID *)&(Time->Daylight)
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"LibGetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mDaylightVariableName,
Status
));
return Status;
}
} else {
// Got the daylight information
Time->Daylight = Daylight;
// Adjust for the correct period
if ((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT) {
// Convert to adjusted time, i.e. spring forwards one hour
EpochSeconds += SEC_PER_HOUR;
}
}
EpochToEfiTime (EpochSeconds, Time);
// Because we use the performance counter, we can fill the Nanosecond attribute
// provided that the remainder doesn't overflow 64-bit during multiplication.
if (Remainder <= 18446744073U) {
Time->Nanosecond = MultU64x64 (Remainder, 1000000000U) / Freq;
} else {
DEBUG ((DEBUG_WARN, "LibGetTime: Nanosecond value not set (64-bit overflow).\n"));
}
if (Capabilities) {
Capabilities->Accuracy = 0;
Capabilities->Resolution = Freq;
Capabilities->SetsToZero = FALSE;
}
return EFI_SUCCESS;
}
/**
Sets the current local time and date information.
@param Time A pointer to the current time.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_INVALID_PARAMETER A time field is out of range.
@retval EFI_DEVICE_ERROR The time could not be set due due to hardware error.
**/
EFI_STATUS
EFIAPI
LibSetTime (
IN EFI_TIME *Time
)
{
EFI_STATUS Status;
UINT64 Freq;
UINT64 Counter;
UINT64 Remainder;
UINTN EpochSeconds;
if (!IsTimeValid (Time)) {
return EFI_INVALID_PARAMETER;
}
EpochSeconds = EfiTimeToEpoch (Time);
// Adjust for the correct time zone, i.e. convert to UTC time zone
if ((Time->TimeZone != EFI_UNSPECIFIED_TIMEZONE)
&& (EpochSeconds > Time->TimeZone * SEC_PER_MIN)) {
EpochSeconds -= Time->TimeZone * SEC_PER_MIN;
}
// Adjust for the correct period
if (((Time->Daylight & EFI_TIME_IN_DAYLIGHT) == EFI_TIME_IN_DAYLIGHT)
&& (EpochSeconds > SEC_PER_HOUR)) {
// Convert to un-adjusted time, i.e. fall back one hour
EpochSeconds -= SEC_PER_HOUR;
}
// Use the performance counter to subtract the number of seconds
// since platform reset. Without this, setting time from the shell
// and immediately reading it back would result in a forward time
// offset, of the duration during which the platform has been up.
Freq = GetPerformanceCounterProperties (NULL, NULL);
if (Freq != 0) {
Counter = GetPerformanceCounter ();
if (EpochSeconds > DivU64x64Remainder (Counter, Freq, &Remainder)) {
EpochSeconds -= DivU64x64Remainder (Counter, Freq, &Remainder);
}
}
// Save the current time zone information into non-volatile storage
Status = EfiSetVariable (
(CHAR16 *)mTimeZoneVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
sizeof (Time->TimeZone),
(VOID *)&(Time->TimeZone)
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"LibSetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mTimeZoneVariableName,
Status
));
return Status;
}
// Save the current daylight information into non-volatile storage
Status = EfiSetVariable (
(CHAR16 *)mDaylightVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
sizeof(Time->Daylight),
(VOID *)&(Time->Daylight)
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"LibSetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mDaylightVariableName,
Status
));
return Status;
}
Status = EfiSetVariable (
(CHAR16 *)mEpochVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
sizeof (EpochSeconds),
&EpochSeconds
);
if (EFI_ERROR (Status)) {
DEBUG ((
DEBUG_ERROR,
"LibSetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mDaylightVariableName,
Status
));
return Status;
}
return EFI_SUCCESS;
}
/**
Returns the current wakeup alarm clock setting.
@param Enabled Indicates if the alarm is currently enabled or disabled.
@param Pending Indicates if the alarm signal is pending and requires acknowledgement.
@param Time The current alarm setting.
@retval EFI_SUCCESS The alarm settings were returned.
@retval EFI_INVALID_PARAMETER Any parameter is NULL.
@retval EFI_DEVICE_ERROR The wakeup time could not be retrieved due to a hardware error.
**/
EFI_STATUS
EFIAPI
LibGetWakeupTime (
OUT BOOLEAN *Enabled,
OUT BOOLEAN *Pending,
OUT EFI_TIME *Time
)
{
return EFI_UNSUPPORTED;
}
/**
Sets the system wakeup alarm clock time.
@param Enabled Enable or disable the wakeup alarm.
@param Time If Enable is TRUE, the time to set the wakeup alarm for.
@retval EFI_SUCCESS If Enable is TRUE, then the wakeup alarm was enabled. If
Enable is FALSE, then the wakeup alarm was disabled.
@retval EFI_INVALID_PARAMETER A time field is out of range.
@retval EFI_DEVICE_ERROR The wakeup time could not be set due to a hardware error.
@retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
**/
EFI_STATUS
EFIAPI
LibSetWakeupTime (
IN BOOLEAN Enabled,
OUT EFI_TIME *Time
)
{
return EFI_UNSUPPORTED;
}
/**
This is the declaration of an EFI image entry point. This can be the entry point to an application
written to this specification, an EFI boot service driver, or an EFI runtime driver.
@param ImageHandle Handle that identifies the loaded image.
@param SystemTable System Table for this image.
@retval EFI_SUCCESS The operation completed successfully.
**/
EFI_STATUS
EFIAPI
LibRtcInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EFI_SUCCESS;
}
/**
Fixup internal data so that EFI can be call in virtual mode.
Call the passed in Child Notify event and convert any pointers in
lib to virtual mode.
@param[in] Event The Event that is being processed
@param[in] Context Event Context
**/
VOID
EFIAPI
LibRtcVirtualNotifyEvent (
IN EFI_EVENT Event,
IN VOID *Context
)
{
return;
}
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