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MdeModulePkg/VariableFlashInfoLib: Add initial library 

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>
This commit is contained in:
Michael Kubacki 2022-04-08 11:53:29 -04:00 committed by mergify[bot]
parent 0903042b66
commit 60b519456c
6 changed files with 313 additions and 0 deletions
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68
MdeModulePkg/Include/Library/VariableFlashInfoLib.h Normal file
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@ -0,0 +1,68 @@
/** @file
Variable Flash Information Library
Copyright (c) Microsoft Corporation<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef VARIABLE_FLASH_INFO_LIB_H_
#define VARIABLE_FLASH_INFO_LIB_H_
/**
Get the base address and size for the NV storage area used for UEFI variable storage.
@param[out] BaseAddress The NV storage base address.
@param[out] Length The NV storage length in bytes.
@retval EFI_SUCCESS NV storage information was found successfully.
@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
@retval EFI_NOT_FOUND NV storage information could not be found.
**/
EFI_STATUS
EFIAPI
GetVariableFlashNvStorageInfo (
OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
OUT UINT64 *Length
);
/**
Get the base address and size for the fault tolerant write (FTW) spare
area used for UEFI variable storage.
@param[out] BaseAddress The FTW spare base address.
@param[out] Length The FTW spare length in bytes.
@retval EFI_SUCCESS FTW spare information was found successfully.
@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
@retval EFI_NOT_FOUND FTW spare information could not be found.
**/
EFI_STATUS
EFIAPI
GetVariableFlashFtwSpareInfo (
OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
OUT UINT64 *Length
);
/**
Get the base address and size for the fault tolerant write (FTW) working
area used for UEFI variable storage.
@param[out] BaseAddress The FTW working area base address.
@param[out] Length The FTW working area length in bytes.
@retval EFI_SUCCESS FTW working information was found successfully.
@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
@retval EFI_NOT_FOUND FTW working information could not be found.
**/
EFI_STATUS
EFIAPI
GetVariableFlashFtwWorkingInfo (
OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
OUT UINT64 *Length
);
#endif

179
MdeModulePkg/Library/BaseVariableFlashInfoLib/BaseVariableFlashInfoLib.c Normal file
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/** @file
Variable Flash Information Library
Copyright (c) Microsoft Corporation<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <Pi/PiMultiPhase.h>
#include <Guid/VariableFlashInfo.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/VariableFlashInfoLib.h>
/**
Get the HOB that contains variable flash information.
@param[out] VariableFlashInfo Pointer to a pointer to set to the variable flash information structure.
@retval EFI_SUCCESS Variable flash information was found successfully.
@retval EFI_INVALID_PARAMETER The VariableFlashInfo pointer given is NULL.
@retval EFI_NOT_FOUND Variable flash information could not be found.
**/
STATIC
EFI_STATUS
GetVariableFlashInfoFromHob (
OUT VARIABLE_FLASH_INFO **VariableFlashInfo
)
{
EFI_HOB_GUID_TYPE *GuidHob;
if (VariableFlashInfo == NULL) {
return EFI_INVALID_PARAMETER;
}
GuidHob = GetFirstGuidHob (&gVariableFlashInfoHobGuid);
if (GuidHob == NULL) {
return EFI_NOT_FOUND;
}
*VariableFlashInfo = GET_GUID_HOB_DATA (GuidHob);
//
// Assert if more than one variable flash information HOB is present.
//
DEBUG_CODE (
if ((GetNextGuidHob (&gVariableFlashInfoHobGuid, GET_NEXT_HOB (GuidHob)) != NULL)) {
DEBUG ((DEBUG_ERROR, "ERROR: Found two variable flash information HOBs\n"));
ASSERT (FALSE);
}
);
return EFI_SUCCESS;
}
/**
Get the base address and size for the NV storage area used for UEFI variable storage.
@param[out] BaseAddress The NV storage base address.
@param[out] Length The NV storage length in bytes.
@retval EFI_SUCCESS NV storage information was found successfully.
@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
**/
EFI_STATUS
EFIAPI
GetVariableFlashNvStorageInfo (
OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
OUT UINT64 *Length
)
{
EFI_STATUS Status;
VARIABLE_FLASH_INFO *VariableFlashInfo;
if ((BaseAddress == NULL) || (Length == NULL)) {
return EFI_INVALID_PARAMETER;
}
Status = GetVariableFlashInfoFromHob (&VariableFlashInfo);
if (!EFI_ERROR (Status)) {
*BaseAddress = VariableFlashInfo->NvVariableBaseAddress;
*Length = VariableFlashInfo->NvVariableLength;
} else {
*BaseAddress = (EFI_PHYSICAL_ADDRESS)(PcdGet64 (PcdFlashNvStorageVariableBase64) != 0 ?
PcdGet64 (PcdFlashNvStorageVariableBase64) :
PcdGet32 (PcdFlashNvStorageVariableBase)
);
*Length = (UINT64)PcdGet32 (PcdFlashNvStorageVariableSize);
}
return EFI_SUCCESS;
}
/**
Get the base address and size for the fault tolerant write (FTW) spare
area used for UEFI variable storage.
@param[out] BaseAddress The FTW spare base address.
@param[out] Length The FTW spare length in bytes.
@retval EFI_SUCCESS FTW spare information was found successfully.
@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
@retval EFI_NOT_FOUND FTW spare information could not be found.
**/
EFI_STATUS
EFIAPI
GetVariableFlashFtwSpareInfo (
OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
OUT UINT64 *Length
)
{
EFI_STATUS Status;
VARIABLE_FLASH_INFO *VariableFlashInfo;
if ((BaseAddress == NULL) || (Length == NULL)) {
return EFI_INVALID_PARAMETER;
}
Status = GetVariableFlashInfoFromHob (&VariableFlashInfo);
if (!EFI_ERROR (Status)) {
*BaseAddress = VariableFlashInfo->FtwSpareBaseAddress;
*Length = VariableFlashInfo->FtwSpareLength;
} else {
*BaseAddress = (EFI_PHYSICAL_ADDRESS)(PcdGet64 (PcdFlashNvStorageFtwSpareBase64) != 0 ?
PcdGet64 (PcdFlashNvStorageFtwSpareBase64) :
PcdGet32 (PcdFlashNvStorageFtwSpareBase)
);
*Length = (UINT64)PcdGet32 (PcdFlashNvStorageFtwSpareSize);
}
return EFI_SUCCESS;
}
/**
Get the base address and size for the fault tolerant write (FTW) working
area used for UEFI variable storage.
@param[out] BaseAddress The FTW working area base address.
@param[out] Length The FTW working area length in bytes.
@retval EFI_SUCCESS FTW working information was found successfully.
@retval EFI_INVALID_PARAMETER A required pointer parameter is NULL.
@retval EFI_NOT_FOUND FTW working information could not be found.
**/
EFI_STATUS
EFIAPI
GetVariableFlashFtwWorkingInfo (
OUT EFI_PHYSICAL_ADDRESS *BaseAddress,
OUT UINT64 *Length
)
{
EFI_STATUS Status;
VARIABLE_FLASH_INFO *VariableFlashInfo;
if ((BaseAddress == NULL) || (Length == NULL)) {
return EFI_INVALID_PARAMETER;
}
Status = GetVariableFlashInfoFromHob (&VariableFlashInfo);
if (!EFI_ERROR (Status)) {
*BaseAddress = VariableFlashInfo->FtwWorkingBaseAddress;
*Length = VariableFlashInfo->FtwWorkingLength;
} else {
*BaseAddress = (EFI_PHYSICAL_ADDRESS)(PcdGet64 (PcdFlashNvStorageFtwWorkingBase64) != 0 ?
PcdGet64 (PcdFlashNvStorageFtwWorkingBase64) :
PcdGet32 (PcdFlashNvStorageFtwWorkingBase)
);
*Length = (UINT64)PcdGet32 (PcdFlashNvStorageFtwWorkingSize);
}
return EFI_SUCCESS;
}

48
MdeModulePkg/Library/BaseVariableFlashInfoLib/BaseVariableFlashInfoLib.inf Normal file
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@ -0,0 +1,48 @@
## @file
# Variable Flash Information Library
#
# Provides services to access UEFI variable flash information.
#
# Copyright (c) Microsoft Corporation<BR>
# SPDX-License-Identifier: BSD-2-Clause-Patent
##
[Defines]
INF_VERSION = 0x00010005
BASE_NAME = BaseVariableFlashInfoLib
MODULE_UNI_FILE = BaseVariableFlashInfoLib.uni
FILE_GUID = DEC426C9-C92E-4BAD-8E93-3F61C261118B
MODULE_TYPE = BASE
VERSION_STRING = 1.0
LIBRARY_CLASS = VariableFlashInfoLib
#
# The following information is for reference only and not required by the build tools.
#
# VALID_ARCHITECTURES = ANY
#
[Sources]
BaseVariableFlashInfoLib.c
[Packages]
MdePkg/MdePkg.dec
MdeModulePkg/MdeModulePkg.dec
[LibraryClasses]
DebugLib
HobLib
[Guids]
gVariableFlashInfoHobGuid ## CONSUMES ## HOB
[Pcd]
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase64 ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase64 ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase64 ## SOMETIMES_CONSUMES
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingSize ## SOMETIMES_CONSUMES

12
MdeModulePkg/Library/BaseVariableFlashInfoLib/BaseVariableFlashInfoLib.uni Normal file
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@ -0,0 +1,12 @@
// /** @file
// Variable Flash Information Library
//
// Copyright (c) Microsoft Corporation<BR>
//
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
// **/
#string STR_MODULE_ABSTRACT #language en-US "UEFI variable flash information library"
#string STR_MODULE_DESCRIPTION #language en-US "Provides services to access UEFI variable flash information."

4
MdeModulePkg/MdeModulePkg.dec
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@ -154,6 +154,10 @@
#
VariablePolicyHelperLib|Include/Library/VariablePolicyHelperLib.h
## @libraryclass Provides services to access UEFI variable flash information.
#
VariableFlashInfoLib|Include/Library/VariableFlashInfoLib.h
[Guids]
## MdeModule package token space guid
# Include/Guid/MdeModulePkgTokenSpace.h

2
MdeModulePkg/MdeModulePkg.dsc
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@ -103,6 +103,7 @@
DisplayUpdateProgressLib|MdeModulePkg/Library/DisplayUpdateProgressLibGraphics/DisplayUpdateProgressLibGraphics.inf
VariablePolicyHelperLib|MdeModulePkg/Library/VariablePolicyHelperLib/VariablePolicyHelperLib.inf
MmUnblockMemoryLib|MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf
VariableFlashInfoLib|MdeModulePkg/Library/BaseVariableFlashInfoLib/BaseVariableFlashInfoLib.inf
[LibraryClasses.EBC.PEIM]
IoLib|MdePkg/Library/PeiIoLibCpuIo/PeiIoLibCpuIo.inf
@ -440,6 +441,7 @@
MdeModulePkg/Library/FmpAuthenticationLibNull/FmpAuthenticationLibNull.inf
MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.inf
MdeModulePkg/Library/DxeCapsuleLibFmp/DxeRuntimeCapsuleLib.inf
MdeModulePkg/Library/BaseVariableFlashInfoLib/BaseVariableFlashInfoLib.inf
[Components.IA32, Components.X64, Components.AARCH64]
MdeModulePkg/Universal/EbcDxe/EbcDxe.inf