015be4075f
Some virtual machine managers like Kvmtool emulate the MC146818
RTC controller in the MMIO space so that architectures that do
not support I/O Mapped I/O can use the RTC. This patch adds MMIO
support to the RTC controller driver.
The PCD PcdRtcUseMmio has been added to select I/O or MMIO support.
If PcdRtcUseMmio is:
TRUE - Indicates the RTC port registers are in MMIO space.
FALSE - Indicates the RTC port registers are in I/O space.
Default is I/O space.
Additionally two new PCDs PcdRtcIndexRegister64 and
PcdRtcTargetRegister64 have been introduced to provide the base
address for the RTC registers in the MMIO space.
When MMIO support is selected (PcdRtcUseMmio == TRUE) the driver
converts the pointers to the RTC MMIO registers so that the
RTC registers are accessible post ExitBootServices.
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
89 lines
2.7 KiB
INI
89 lines
2.7 KiB
INI
## @file
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# PcRtc driver to install EFI_REAL_TIME_CLOCK_ARCH_PROTOCOL.
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#
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# This driver provides GetTime, SetTime, GetWakeupTime, SetWakeupTime services to Runtime Service Table.
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# It will install a tagging protocol with gEfiRealTimeClockArchProtocolGuid.
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#
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# Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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# Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
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# Copyright (c) 2018 - 2020, ARM Limited. All rights reserved.<BR>
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#
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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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 = PcRtc
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MODULE_UNI_FILE = PcRtc.uni
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FILE_GUID = 378D7B65-8DA9-4773-B6E4-A47826A833E1
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MODULE_TYPE = DXE_RUNTIME_DRIVER
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VERSION_STRING = 1.0
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ENTRY_POINT = InitializePcRtc
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#
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# The following information is for reference only and not required by the build tools.
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#
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# VALID_ARCHITECTURES = IA32 X64 EBC
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#
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[Sources]
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PcRtcEntry.c
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PcRtc.c
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PcRtc.h
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[Packages]
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MdePkg/MdePkg.dec
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PcAtChipsetPkg/PcAtChipsetPkg.dec
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[LibraryClasses]
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UefiRuntimeServicesTableLib
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UefiRuntimeLib
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UefiBootServicesTableLib
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UefiDriverEntryPoint
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TimerLib
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IoLib
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BaseMemoryLib
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UefiLib
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DebugLib
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BaseLib
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PcdLib
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ReportStatusCodeLib
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[Protocols]
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gEfiRealTimeClockArchProtocolGuid ## PRODUCES
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[Guids]
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## SOMETIMES_CONSUMES ## Event
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## SOMETIMES_CONSUMES ## SystemTable
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gEfiAcpi10TableGuid
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## SOMETIMES_CONSUMES ## Event
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## SOMETIMES_CONSUMES ## SystemTable
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gEfiAcpiTableGuid
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gEfiEventVirtualAddressChangeGuid
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[FeaturePcd]
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gPcAtChipsetPkgTokenSpaceGuid.PcdRtcUseMmio ## CONSUMES
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[FixedPcd]
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gPcAtChipsetPkgTokenSpaceGuid.PcdInitialValueRtcRegisterA ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdInitialValueRtcRegisterB ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdInitialValueRtcRegisterD ## CONSUMES
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[Pcd]
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gPcAtChipsetPkgTokenSpaceGuid.PcdRealTimeClockUpdateTimeout ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdMinimalValidYear ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdMaximalValidYear ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdRtcIndexRegister ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdRtcTargetRegister ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdRtcIndexRegister64 ## CONSUMES
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gPcAtChipsetPkgTokenSpaceGuid.PcdRtcTargetRegister64 ## CONSUMES
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[Depex]
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gEfiVariableArchProtocolGuid AND gEfiVariableWriteArchProtocolGuid
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[UserExtensions.TianoCore."ExtraFiles"]
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PcRtcExtra.uni
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