60b519456c
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3479 Adds a new library class VariableFlashInfoLib that abstracts access to variable flash information. The instance provided first attempts to retrieve information from the Variable Flash Info HOB. If that HOB is not present, it falls back to the PCDs defined in MdeModulePkg. This fall back behavior provides backward compatibility for platforms that only provide PCDs but also allows platforms that need to dynamically provide the information using the Variable Flash Info HOB to do so at runtime. Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/** @file
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Variable Flash Information Library
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Copyright (c) Microsoft Corporation<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef VARIABLE_FLASH_INFO_LIB_H_
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#define VARIABLE_FLASH_INFO_LIB_H_
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/**
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Get the base address and size for the NV storage area used for UEFI variable storage.
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@param[out] BaseAddress The NV storage base address.
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@param[out] Length The NV storage length in bytes.
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@retval EFI_SUCCESS NV storage information was found successfully.
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@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
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@retval EFI_NOT_FOUND NV storage information could not be found.
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**/
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EFI_STATUS
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EFIAPI
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GetVariableFlashNvStorageInfo (
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OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
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OUT UINT64 *Length
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);
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/**
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Get the base address and size for the fault tolerant write (FTW) spare
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area used for UEFI variable storage.
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@param[out] BaseAddress The FTW spare base address.
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@param[out] Length The FTW spare length in bytes.
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@retval EFI_SUCCESS FTW spare information was found successfully.
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@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
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@retval EFI_NOT_FOUND FTW spare information could not be found.
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**/
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EFI_STATUS
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EFIAPI
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GetVariableFlashFtwSpareInfo (
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OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
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OUT UINT64 *Length
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);
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/**
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Get the base address and size for the fault tolerant write (FTW) working
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area used for UEFI variable storage.
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@param[out] BaseAddress The FTW working area base address.
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@param[out] Length The FTW working area length in bytes.
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@retval EFI_SUCCESS FTW working information was found successfully.
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@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
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@retval EFI_NOT_FOUND FTW working information could not be found.
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**/
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EFI_STATUS
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EFIAPI
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GetVariableFlashFtwWorkingInfo (
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OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
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OUT UINT64 *Length
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);
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#endif
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