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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v3 23/27] Ovmf/Xen: implement dummy RealTimeClockLib for Xen
Reviewed-By: Olivier Martin <olivier.martin@xxxxxxx> 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 <ard.biesheuvel@xxxxxxxxxx> --- .../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 -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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