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 <ard.biesheu...@linaro.org> --- .../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 -- 1.8.3.2 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel