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/** @file
This file declares Read-only Variable Service PPI
Copyright (c) 2006, Intel Corporation
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: ReadOnlyVariable.h
@par Revision Reference:
This PPI is defined in PEI CIS
Version 0.91.
**/
#ifndef __PEI_READ_ONLY_VARIABLE_PPI_H__
#define __PEI_READ_ONLY_VARIABLE_PPI_H__
#define EFI_PEI_READ_ONLY_VARIABLE_ACCESS_PPI_GUID \
{ \
0x3cdc90c6, 0x13fb, 0x4a75, {0x9e, 0x79, 0x59, 0xe9, 0xdd, 0x78, 0xb9, 0xfa } \
}
typedef struct _EFI_PEI_READ_ONLY_VARIABLE_PPI EFI_PEI_READ_ONLY_VARIABLE_PPI;
//
// Variable attributes
//
#define EFI_VARIABLE_NON_VOLATILE 0x00000001
#define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x00000002
#define EFI_VARIABLE_RUNTIME_ACCESS 0x00000004
#define EFI_VARIABLE_READ_ONLY 0x00000008
/**
Get Variable value by Name and GUID pair
@param PeiServices An indirect pointer to the PEI Services Table published by the PEI Foundation.
@param VariableName A NULL-terminated Unicode string that is the name of the vendor's variable.
@param VendorGuid A unique identifier for the vendor.
@param Attributes If not NULL, a pointer to the memory location to return
the attributes bitmask for the variable.
@param DataSize On input, the size in bytes of the return Data buffer.
On output, the size of data returned in Data.
@param Data The buffer to return the contents of the variable.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The variable was not found.
@retval EFI_BUFFER_TOO_SMALL The BufferSize is too small for the result.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
@retval EFI_DEVICE_ERROR The variable could not be retrieved due to a hardware error.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_GET_VARIABLE) (
IN EFI_PEI_SERVICES **PeiServices,
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Data
);
/**
This function can be called multiple times to retrieve the VariableName
and VendorGuid of all variables currently available in the system. On each call
to GetNextVariableName() the previous results are passed into the interface,
and on output the interface returns the next variable name data. When the
entire variable list has been returned, the error EFI_NOT_FOUND is returned.
@param PeiServices An indirect pointer to the PEI Services Table published by the PEI Foundation.
@param VariableNameSize The size of the VariableName buffer.
@param VariableName On input, supplies the last VariableName that was
returned by GetNextVariableName(). On output, returns the Null-terminated
Unicode string of the current variable.
@param VendorGuid On input, supplies the last VendorGuid that was
returned by GetNextVariableName(). On output, returns the VendorGuid
of the current variable.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The next variable was not found.
@retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the result.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
@retval EFI_DEVICE_ERROR The variable name could not be retrieved due to a hardware error.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_GET_NEXT_VARIABLE_NAME) (
IN EFI_PEI_SERVICES **PeiServices,
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VendorGuid
);
/**
@par Ppi Description:
This PPI provides a lightweight, read-only variant of the full EFI
variable services.
@param GetVariable
A service to ascertain a given variable name.
@param GetNextVariableName
A service to ascertain a variable based upon a given, known variable
**/
struct _EFI_PEI_READ_ONLY_VARIABLE_PPI {
EFI_PEI_GET_VARIABLE PeiGetVariable;
EFI_PEI_GET_NEXT_VARIABLE_NAME PeiGetNextVariableName;
};
extern EFI_GUID gEfiPeiReadOnlyVariablePpiGuid;
#endif
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