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/** @file
Module produce EFI_PEI_READ_ONLY_VARIABLE_PPI on top of EFI_PEI_READ_ONLY_VARIABLE2_PPI.
UEFI PI Spec supersedes Intel's Framework Specs.
# EFI_PEI_READ_ONLY_VARIABLE_PPI defined in Intel Framework Pkg is replaced by EFI_PEI_READ_ONLY_VARIABLE2_PPI
# in MdePkg.
# This module produces EFI_PEI_READ_ONLY_VARIABLE_PPI on top of EFI_PEI_READ_ONLY_VARIABLE2_PPI.
# This module is used on platform when both of these two conditions are true:
# 1) Framework module consumes EFI_PEI_READ_ONLY_VARIABLE_PPI is present.
# 2) The platform has a PI module that only produces EFI_PEI_READ_ONLY_VARIABLE2_PPI.
This module can't be used together with ReadOnlyVariable2ToReadOnlyVariableThunk module.
Copyright (c) 2006 - 2008 Intel Corporation. <BR>
All rights reserved. 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.
Module Name:
**/
#include <PiPei.h>
#include <Ppi/ReadOnlyVariable.h>
#include <Ppi/ReadOnlyVariable2.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.h>
//
// Function Prototypes
//
EFI_STATUS
EFIAPI
PeiGetVariable (
IN EFI_PEI_SERVICES **PeiServices,
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Data
);
EFI_STATUS
EFIAPI
PeiGetNextVariableName (
IN EFI_PEI_SERVICES **PeiServices,
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VendorGuid
);
//
// Module globals
//
EFI_PEI_READ_ONLY_VARIABLE_PPI mVariablePpi = {
PeiGetVariable,
PeiGetNextVariableName
};
EFI_PEI_PPI_DESCRIPTOR mPpiListVariable = {
(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gEfiPeiReadOnlyVariablePpiGuid,
&mVariablePpi
};
/**
Standard entry point of a PEIM.
@param FfsHeadher The FFS file header
@param PeiServices General purpose services available to every PEIM.
@retval EFI_SUCCESS If the gEfiPeiReadOnlyVariablePpiGuid interface could be successfully installed.
**/
EFI_STATUS
EFIAPI
PeimInitializeReadOnlyVariable (
IN EFI_PEI_FILE_HANDLE FfsHeader,
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
//
//Developer should make sure ReadOnlyVariableToReadOnlyVariable2 module is not present. If so, the call chain will form a
// infinite loop: ReadOnlyVariable -> ReadOnlyVariable2 -> ReadOnlyVariable -> ....
//
//
// Publish the variable capability to other modules
//
return (*PeiServices)->InstallPpi (PeiServices, &mPpiListVariable);
}
/**
Provide the read variable functionality of the variable services.
@param PeiServices General purpose services available to every PEIM.
@param VariableName The variable name
@param VendorGuid The vendor's GUID
@param Attributes Pointer to the attribute
@param DataSize Size of data
@param Data Pointer to data
@retval EFI_SUCCESS The interface could be successfully installed
@retval EFI_NOT_FOUND The variable could not be discovered
@retval EFI_BUFFER_TOO_SMALL The caller buffer is not large enough
**/
EFI_STATUS
EFIAPI
PeiGetVariable (
IN EFI_PEI_SERVICES **PeiServices,
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Data
)
{
EFI_STATUS Status;
EFI_PEI_READ_ONLY_VARIABLE2_PPI *ReadOnlyVariable2;
Status = (*PeiServices)->LocatePpi (
(CONST EFI_PEI_SERVICES **)PeiServices,
&gEfiPeiReadOnlyVariable2PpiGuid,
0,
NULL,
(VOID **)&ReadOnlyVariable2
);
ASSERT_EFI_ERROR (Status);
return ReadOnlyVariable2->GetVariable (
ReadOnlyVariable2,
VariableName,
VendorGuid,
Attributes,
DataSize,
Data
);
}
/**
Provide the get next variable functionality of the variable services.
@param PeiServices General purpose services available to every PEIM.
@param VariabvleNameSize The variable name's size.
@param VariableName A pointer to the variable's name.
@param VariableGuid A pointer to the EFI_GUID structure.
@param VariableNameSize Size of the variable name
@param VariableName The variable name
@param VendorGuid The vendor's GUID
@retval EFI_SUCCESS The interface could be successfully installed
@retval EFI_NOT_FOUND The variable could not be discovered
**/
EFI_STATUS
EFIAPI
PeiGetNextVariableName (
IN EFI_PEI_SERVICES **PeiServices,
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VendorGuid
)
{
EFI_STATUS Status;
EFI_PEI_READ_ONLY_VARIABLE2_PPI *ReadOnlyVariable2;
Status = (*PeiServices)->LocatePpi (
(CONST EFI_PEI_SERVICES **)PeiServices,
&gEfiPeiReadOnlyVariable2PpiGuid,
0,
NULL,
(VOID **)&ReadOnlyVariable2
);
ASSERT_EFI_ERROR (Status);
return ReadOnlyVariable2->NextVariableName (
ReadOnlyVariable2,
VariableNameSize,
VariableName,
VendorGuid
);
}
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