First of all - this is something I would like to see contributed directly to edk2 EmbeddedPkg. It's something me and Ard have discussed adding at some point, but never getting around to.
I would also like to look into whether we could replace PcdBootEpochSeconds with a -DBUILD_EPOCH=`date +%s` addition to the CFLAGS in the .inf. Regards, Leif On Tue, Jan 29, 2019 at 04:26:38PM +0000, Pete Batard wrote: > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Pete Batard <p...@akeo.ie> > --- > > Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.c > | 221 ++++++++++++++++++++ > > Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf > | 43 ++++ > 2 files changed, 264 insertions(+) > > diff --git > a/Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.c > > b/Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.c > new file mode 100644 > index 000000000000..dea621ff03ef > --- /dev/null > +++ > b/Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.c > @@ -0,0 +1,221 @@ > +/** @file > + * > + * Implement dummy EFI RealTimeClock runtime services. > + * > + * Copyright (c) 2018, Andrei Warkentin <andrey.warken...@gmail.com> > + * Copyright (c) Microsoft Corporation. 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 <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> > +#include <Library/ArmGenericTimerCounterLib.h> > + > +/** > + Returns the current time and date information, and the time-keeping > capabilities > + of the virtual RTC. > + > + For simplicity, this LibGetTime does not report Years/Months, instead it > will only report current > + Day, Hours, Minutes and Seconds starting from the begining of CPU > up-time. Otherwise, a more > + complex logic will be required to account for leap years and days/month > differences. > + > + @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 > + ) > +{ > + UINTN DataSize; > + UINT64 Counter; > + EFI_STATUS Status; > + UINTN ElapsedSeconds; > + UINT32 Remainder; > + UINT32 Freq = ArmGenericTimerGetTimerFreq (); > + > + if (Time == NULL) { > + return EFI_INVALID_PARAMETER; > + } > + > + // > + // Depend on ARM generic timer to report date/time relative to the > + // start of CPU timer counting where date and time will always > + // be relative to the date/time 1/1/1900 00H:00M:00S > + // > + > + ASSERT (Freq != 0); > + if (Freq == 0) { > + return EFI_DEVICE_ERROR; > + } > + > + if (Capabilities) { > + Capabilities->Accuracy = 0; > + Capabilities->Resolution = Freq; > + Capabilities->SetsToZero = FALSE; > + } > + > + DataSize = sizeof (UINTN); > + ElapsedSeconds = 0; > + Status = EfiGetVariable (L"RtcEpochSeconds", > + &gEfiCallerIdGuid, > + NULL, > + &DataSize, > + &ElapsedSeconds); > + if (EFI_ERROR (Status)) { > + ElapsedSeconds = PcdGet64 (PcdBootEpochSeconds); > + } > + Counter = GetPerformanceCounter (); > + ElapsedSeconds += DivU64x32Remainder (Counter, Freq, &Remainder); > + EpochToEfiTime (ElapsedSeconds, Time); > + > + // > + // Frequency < 0x100000000, so Remainder < 0x100000000, then (Remainder * > 1,000,000,000) > + // will not overflow 64-bit. > + // > + Time->Nanosecond = DivU64x32 (MultU64x64 ((UINT64)Remainder, 1000000000U), > Freq); > + > + 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 > + ) > +{ > + UINTN Epoch; > + > + if (!IsTimeValid (Time)) { > + return EFI_INVALID_PARAMETER; > + } > + > + Epoch = EfiTimeToEpoch (Time); > + return EfiSetVariable (L"RtcEpochSeconds", &gEfiCallerIdGuid, > + EFI_VARIABLE_BOOTSERVICE_ACCESS | > + EFI_VARIABLE_RUNTIME_ACCESS | > + EFI_VARIABLE_NON_VOLATILE, > + sizeof (Epoch), > + &Epoch); > +} > + > + > +/** > + 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; > +} > diff --git > a/Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf > > b/Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf > new file mode 100644 > index 000000000000..5c39e4df4c34 > --- /dev/null > +++ > b/Platform/Raspberry/Pi3/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf > @@ -0,0 +1,43 @@ > +#/** @file > +# > +# Implement dummy EFI RealTimeClock runtime services. > +# > +# Copyright (c) 2018, Andrei Warkentin <andrey.warken...@gmail.com> > +# Copyright (c) Microsoft Corporation. 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 = 0x0001001A > + BASE_NAME = VirtualRealTimeClockLib > + FILE_GUID = 1E27D461-78F3-4F7D-B1C2-F72384F13A6E > + MODULE_TYPE = BASE > + VERSION_STRING = 1.0 > + LIBRARY_CLASS = RealTimeClockLib > + > +[Sources.common] > + VirtualRealTimeClockLib.c > + > +[Packages] > + ArmPkg/ArmPkg.dec > + MdePkg/MdePkg.dec > + EmbeddedPkg/EmbeddedPkg.dec > + Platform/Raspberry/Pi3/RPi3.dec > + > +[LibraryClasses] > + IoLib > + DebugLib > + TimerLib > + TimeBaseLib > + UefiRuntimeLib > + > +[Pcd] > + gRaspberryPiTokenSpaceGuid.PcdBootEpochSeconds > -- > 2.17.0.windows.1 > _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
