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/*++
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:
Variable.c
Abstract:
PEIM to provide the Variable functionality
--*/
#include <PiPei.h>
#include <Ppi/ReadOnlyVariable2.h>
#include <Ppi/ReadOnlyVariable.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesTablePointerLib.h>
#include <Library/PeiServicesLib.h>
//
// Function Prototypes
//
EFI_STATUS
EFIAPI
PeiGetVariable (
IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
IN CONST CHAR16 *VariableName,
IN CONST EFI_GUID *VariableGuid,
OUT UINT32 *Attributes,
IN OUT UINTN *DataSize,
OUT VOID *Data
);
EFI_STATUS
EFIAPI
PeiGetNextVariableName (
IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VariableGuid
);
//
// Module globals
//
EFI_PEI_READ_ONLY_VARIABLE2_PPI mVariablePpi = {
PeiGetVariable,
PeiGetNextVariableName
};
EFI_PEI_PPI_DESCRIPTOR mPpiListVariable = {
(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gEfiPeiReadOnlyVariable2PpiGuid,
&mVariablePpi
};
EFI_STATUS
EFIAPI
PeimInitializeReadOnlyVariable2 (
IN EFI_FFS_FILE_HEADER *FfsHeader,
IN EFI_PEI_SERVICES **PeiServices
)
/*++
Routine Description:
Provide the functionality of the variable services.
Arguments:
FfsHeadher - The FFS file header
PeiServices - General purpose services available to every PEIM.
Returns:
Status - EFI_SUCCESS if the interface could be successfully
installed
--*/
{
//
// Publish the variable capability to other modules
//
return PeiServicesInstallPpi (&mPpiListVariable);
}
EFI_STATUS
EFIAPI
PeiGetVariable (
IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
IN CONST CHAR16 *VariableName,
IN CONST EFI_GUID *VariableGuid,
OUT UINT32 *Attributes,
IN OUT UINTN *DataSize,
OUT VOID *Data
)
/*++
Routine Description:
Provide the read variable functionality of the variable services.
Arguments:
PeiServices - General purpose services available to every PEIM.
VariableName - The variable name
VendorGuid - The vendor's GUID
Attributes - Pointer to the attribute
DataSize - Size of data
Data - Pointer to data
Returns:
EFI_SUCCESS - The interface could be successfully installed
EFI_NOT_FOUND - The variable could not be discovered
EFI_BUFFER_TOO_SMALL - The caller buffer is not large enough
--*/
{
EFI_STATUS Status;
EFI_PEI_READ_ONLY_VARIABLE_PPI *ReadOnlyVariable;
Status = PeiServicesLocatePpi (
&gEfiPeiReadOnlyVariablePpiGuid,
0,
NULL,
(VOID **)&ReadOnlyVariable
);
ASSERT_EFI_ERROR (Status);
return ReadOnlyVariable->PeiGetVariable (
GetPeiServicesTablePointer (),
(CHAR16 *)VariableName,
(EFI_GUID *)VariableGuid,
Attributes,
DataSize,
Data
);
}
EFI_STATUS
EFIAPI
PeiGetNextVariableName (
IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VariableGuid
)
/*++
Routine Description:
Provide the get next variable functionality of the variable services.
Arguments:
PeiServices - General purpose services available to every PEIM.
VariabvleNameSize - The variable name's size.
VariableName - A pointer to the variable's name.
VariableGuid - A pointer to the EFI_GUID structure.
VariableNameSize - Size of the variable name
VariableName - The variable name
VendorGuid - The vendor's GUID
Returns:
EFI_SUCCESS - The interface could be successfully installed
EFI_NOT_FOUND - The variable could not be discovered
--*/
{
EFI_STATUS Status;
EFI_PEI_READ_ONLY_VARIABLE_PPI *ReadOnlyVariable;
Status = PeiServicesLocatePpi (
&gEfiPeiReadOnlyVariablePpiGuid,
0,
NULL,
(VOID **)&ReadOnlyVariable
);
ASSERT_EFI_ERROR (Status);
return ReadOnlyVariable->PeiGetNextVariableName (
GetPeiServicesTablePointer (),
VariableNameSize,
VariableName,
VariableGuid
);
}
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