mirror of https://github.com/acidanthera/audk.git
ArmVirtualizationPkg: implement dummy RealTimeClockLib for Xen
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 Acked-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Olivier Martin <olivier.martin@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16977 6f19259b-4bc3-4df7-8a09-765794883524
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Ard Biesheuvel
lersek
parent
d401a48741
commit
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/** @file
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Implement EFI RealTimeClock runtime services via Xen shared info page
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Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <PiDxe.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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/**
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Converts Epoch seconds (elapsed since 1970 JANUARY 01, 00:00:00 UTC) to EFI_TIME
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**/
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STATIC
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VOID
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EpochToEfiTime (
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IN UINTN EpochSeconds,
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OUT EFI_TIME *Time
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)
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{
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UINTN a;
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UINTN b;
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UINTN c;
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UINTN d;
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UINTN g;
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UINTN j;
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UINTN m;
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UINTN y;
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UINTN da;
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UINTN db;
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UINTN dc;
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UINTN dg;
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UINTN hh;
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UINTN mm;
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UINTN ss;
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UINTN J;
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J = (EpochSeconds / 86400) + 2440588;
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j = J + 32044;
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g = j / 146097;
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dg = j % 146097;
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c = (((dg / 36524) + 1) * 3) / 4;
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dc = dg - (c * 36524);
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b = dc / 1461;
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db = dc % 1461;
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a = (((db / 365) + 1) * 3) / 4;
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da = db - (a * 365);
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y = (g * 400) + (c * 100) + (b * 4) + a;
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m = (((da * 5) + 308) / 153) - 2;
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d = da - (((m + 4) * 153) / 5) + 122;
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Time->Year = y - 4800 + ((m + 2) / 12);
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Time->Month = ((m + 2) % 12) + 1;
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Time->Day = d + 1;
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ss = EpochSeconds % 60;
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a = (EpochSeconds - ss) / 60;
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mm = a % 60;
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b = (a - mm) / 60;
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hh = b % 24;
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Time->Hour = hh;
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Time->Minute = mm;
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Time->Second = ss;
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Time->Nanosecond = 0;
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}
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/**
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Returns the current time and date information, and the time-keeping capabilities
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of the hardware platform.
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@param Time A pointer to storage to receive a snapshot of the current time.
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@param Capabilities An optional pointer to a buffer to receive the real time clock
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device's capabilities.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_INVALID_PARAMETER Time is NULL.
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@retval EFI_DEVICE_ERROR The time could not be retrieved due to hardware error.
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**/
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EFI_STATUS
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EFIAPI
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LibGetTime (
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OUT EFI_TIME *Time,
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OUT EFI_TIME_CAPABILITIES *Capabilities
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)
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{
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ASSERT (Time != NULL);
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//
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// For now, there is nothing that we can do besides returning a bogus time,
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// as Xen's timekeeping uses a shared info page which cannot be shared
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// between UEFI and the OS
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//
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EpochToEfiTime(1421770011, Time);
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return EFI_SUCCESS;
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}
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/**
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Sets the current local time and date information.
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@param Time A pointer to the current time.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_INVALID_PARAMETER A time field is out of range.
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@retval EFI_DEVICE_ERROR The time could not be set due due to hardware error.
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**/
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EFI_STATUS
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EFIAPI
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LibSetTime (
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IN EFI_TIME *Time
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)
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{
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return EFI_DEVICE_ERROR;
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}
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/**
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Returns the current wakeup alarm clock setting.
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@param Enabled Indicates if the alarm is currently enabled or disabled.
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@param Pending Indicates if the alarm signal is pending and requires acknowledgement.
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@param Time The current alarm setting.
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@retval EFI_SUCCESS The alarm settings were returned.
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@retval EFI_INVALID_PARAMETER Any parameter is NULL.
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@retval EFI_DEVICE_ERROR The wakeup time could not be retrieved due to a hardware error.
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@retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
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**/
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EFI_STATUS
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EFIAPI
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LibGetWakeupTime (
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OUT BOOLEAN *Enabled,
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OUT BOOLEAN *Pending,
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OUT EFI_TIME *Time
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)
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{
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return EFI_UNSUPPORTED;
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}
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/**
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Sets the system wakeup alarm clock time.
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@param Enabled Enable or disable the wakeup alarm.
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@param Time If Enable is TRUE, the time to set the wakeup alarm for.
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@retval EFI_SUCCESS If Enable is TRUE, then the wakeup alarm was enabled. If
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Enable is FALSE, then the wakeup alarm was disabled.
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@retval EFI_INVALID_PARAMETER A time field is out of range.
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@retval EFI_DEVICE_ERROR The wakeup time could not be set due to a hardware error.
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@retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
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**/
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EFI_STATUS
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EFIAPI
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LibSetWakeupTime (
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IN BOOLEAN Enabled,
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OUT EFI_TIME *Time
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)
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{
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return EFI_UNSUPPORTED;
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}
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/**
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This is the declaration of an EFI image entry point. This can be the entry point to an application
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written to this specification, an EFI boot service driver, or an EFI runtime driver.
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@param ImageHandle Handle that identifies the loaded image.
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@param SystemTable System Table for this image.
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@retval EFI_SUCCESS The operation completed successfully.
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**/
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EFI_STATUS
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EFIAPI
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LibRtcInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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return EFI_SUCCESS;
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}
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@ -0,0 +1,38 @@
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#/** @file
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#
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# Copyright (c) 2015, L Ltd. All rights reserved.<BR>
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#
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#**/
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[Defines]
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INF_VERSION = 0x00010005
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BASE_NAME = XenRealTimeClockLib
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FILE_GUID = EC2557E8-7005-430B-9F6F-9BA109698248
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MODULE_TYPE = BASE
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VERSION_STRING = 1.0
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LIBRARY_CLASS = RealTimeClockLib|DXE_CORE DXE_DRIVER UEFI_DRIVER DXE_RUNTIME_DRIVER UEFI_APPLICATION
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[Sources.common]
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XenRealTimeClockLib.c
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[Packages]
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MdePkg/MdePkg.dec
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OvmfPkg/OvmfPkg.dec
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EmbeddedPkg/EmbeddedPkg.dec
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[LibraryClasses]
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UefiLib
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DebugLib
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DxeServicesTableLib
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UefiRuntimeLib
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[Guids]
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gEfiEventVirtualAddressChangeGuid
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