Reviewed-By: Olivier Martin <[email protected]> On 03/02/15 19:20, Ard Biesheuvel wrote: > This implements a dummy RealTimeClockLib for Xen, as there is no > guest interface to access the time kept by Xen that can be shared > between UEFI and the OS. > > Contributed-under: TianoCore Contribution Agreement 1.0 > Signed-off-by: Ard Biesheuvel <[email protected]> > --- > .../XenRealTimeClockLib/XenRealTimeClockLib.c | 196 > +++++++++++++++++++++ > .../XenRealTimeClockLib/XenRealTimeClockLib.inf | 38 ++++ > 2 files changed, 234 insertions(+) > create mode 100644 > ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.c > create mode 100644 > ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.inf > > diff --git > a/ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.c > > b/ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.c > new file mode 100644 > index 000000000000..70204ac22a92 > --- /dev/null > +++ > b/ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.c > @@ -0,0 +1,196 @@ > +/** @file > + Implement EFI RealTimeClock runtime services via Xen shared info page > + > + Copyright (c) 2015, Linaro Ltd. 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 > + 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.h> > +#include <PiDxe.h> > +#include <Library/BaseLib.h> > +#include <Library/DebugLib.h> > + > +/** > + Converts Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC) to > EFI_TIME > + **/ > +STATIC > +VOID > +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; > + > +} > + > +/** > + Returns the current time and date information, and the time-keeping > capabilities > + of the hardware platform. > + > + @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 > + ) > +{ > + ASSERT (Time != NULL); > + > + // > + // For now, there is nothing that we can do besides returning a bogus time, > + // as Xen's timekeeping uses a shared info page which cannot be shared > + // between UEFI and the OS > + // > + EpochToEfiTime(1421770011, Time); > + > + 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 > + ) > +{ > + return EFI_DEVICE_ERROR; > +} > + > + > +/** > + 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. > + @retval EFI_UNSUPPORTED A wakeup timer is not supported on this > platform. > + > +**/ > +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; > +} > diff --git > a/ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.inf > > b/ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.inf > new file mode 100644 > index 000000000000..aafbfda6b491 > --- /dev/null > +++ > b/ArmPlatformPkg/ArmVirtualizationPkg/Library/XenRealTimeClockLib/XenRealTimeClockLib.inf > @@ -0,0 +1,38 @@ > +#/** @file > +# > +# Copyright (c) 2015, L Ltd. 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 > +# 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 = XenRealTimeClockLib > + FILE_GUID = EC2557E8-7005-430B-9F6F-9BA109698248 > + MODULE_TYPE = BASE > + VERSION_STRING = 1.0 > + LIBRARY_CLASS = RealTimeClockLib|DXE_CORE DXE_DRIVER > UEFI_DRIVER DXE_RUNTIME_DRIVER UEFI_APPLICATION > + > +[Sources.common] > + XenRealTimeClockLib.c > + > +[Packages] > + MdePkg/MdePkg.dec > + OvmfPkg/OvmfPkg.dec > + EmbeddedPkg/EmbeddedPkg.dec > + > +[LibraryClasses] > + UefiLib > + DebugLib > + DxeServicesTableLib > + UefiRuntimeLib > + > +[Guids] > + gEfiEventVirtualAddressChangeGuid
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