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112 lines
5.0 KiB
C
112 lines
5.0 KiB
C
/** @file
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This file declares Read-only Variable Service2 PPI.
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This ppi permits read-only access to the UEFI variable store during the PEI phase.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This PPI is introduced in PI Version 1.0.
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**/
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#ifndef __PEI_READ_ONLY_VARIABLE2_PPI_H__
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#define __PEI_READ_ONLY_VARIABLE2_PPI_H__
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#define EFI_PEI_READ_ONLY_VARIABLE2_PPI_GUID \
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{ 0x2ab86ef5, 0xecb5, 0x4134, { 0xb5, 0x56, 0x38, 0x54, 0xca, 0x1f, 0xe1, 0xb4 } }
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typedef struct _EFI_PEI_READ_ONLY_VARIABLE2_PPI EFI_PEI_READ_ONLY_VARIABLE2_PPI;
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/**
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This service retrieves a variable's value using its name and GUID.
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Read the specified variable from the UEFI variable store. If the Data
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buffer is too small to hold the contents of the variable,
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the error EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the
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required buffer size to obtain the data.
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@param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
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@param VariableName A pointer to a null-terminated string that is the variable's name.
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@param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of
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VariableGuid and VariableName must be unique.
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@param Attributes If non-NULL, on return, points to the variable's attributes.
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@param DataSize On entry, points to the size in bytes of the Data buffer.
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On return, points to the size of the data returned in Data.
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@param Data Points to the buffer which will hold the returned variable value.
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May be NULL with a zero DataSize in order to determine the size of the buffer needed.
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@retval EFI_SUCCESS The variable was read successfully.
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@retval EFI_NOT_FOUND The variable was not found.
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@retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data.
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DataSize is updated with the size required for
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the specified variable.
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@retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.
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@retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_GET_VARIABLE2)(
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IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
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IN CONST CHAR16 *VariableName,
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IN CONST EFI_GUID *VariableGuid,
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OUT UINT32 *Attributes,
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IN OUT UINTN *DataSize,
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OUT VOID *Data OPTIONAL
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);
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/**
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Return the next variable name and GUID.
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This function is called multiple times to retrieve the VariableName
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and VariableGuid of all variables currently available in the system.
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On each call, the previous results are passed into the interface,
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and, on return, the interface returns the data for the next
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interface. When the entire variable list has been returned,
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EFI_NOT_FOUND is returned.
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@param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
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@param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName.
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On return, the size of the variable name buffer.
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@param VariableName On entry, a pointer to a null-terminated string that is the variable's name.
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On return, points to the next variable's null-terminated name string.
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@param VariableGuid On entry, a pointer to an EFI_GUID that is the variable's GUID.
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On return, a pointer to the next variable's GUID.
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@retval EFI_SUCCESS The variable was read successfully.
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@retval EFI_NOT_FOUND The variable could not be found.
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@retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting
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data. VariableNameSize is updated with the size
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required for the specified variable.
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@retval EFI_INVALID_PARAMETER VariableName, VariableGuid or
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VariableNameSize is NULL.
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@retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_GET_NEXT_VARIABLE_NAME2)(
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IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
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IN OUT UINTN *VariableNameSize,
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IN OUT CHAR16 *VariableName,
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IN OUT EFI_GUID *VariableGuid
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);
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///
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/// This PPI provides a lightweight, read-only variant of the full EFI
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/// variable services.
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///
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struct _EFI_PEI_READ_ONLY_VARIABLE2_PPI {
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EFI_PEI_GET_VARIABLE2 GetVariable;
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EFI_PEI_GET_NEXT_VARIABLE_NAME2 NextVariableName;
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};
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extern EFI_GUID gEfiPeiReadOnlyVariable2PpiGuid;
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#endif
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