mirror of https://github.com/acidanthera/audk.git
115 lines
5.1 KiB
C
115 lines
5.1 KiB
C
/** @file
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This file declares Read-only Variable Service PPI, which is required PPI by framework spec.
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These services provide a lightweight, read-only variant of the full EFI variable services. The
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reason that these services are read-only is to reduce the complexity of flash management. Also,
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some implementation of the PEI may use the same physical flash part for variable and PEIM
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storage; as such, a write command to certain technologies would alter the contents of the entire part,
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thus making the in situ PEIM execution not follow the required flow.
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Copyright (c) 2006 - 2009, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef __PEI_READ_ONLY_VARIABLE_PPI_H__
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#define __PEI_READ_ONLY_VARIABLE_PPI_H__
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#include <PiPei.h>
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#define EFI_PEI_READ_ONLY_VARIABLE_ACCESS_PPI_GUID \
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{ \
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0x3cdc90c6, 0x13fb, 0x4a75, {0x9e, 0x79, 0x59, 0xe9, 0xdd, 0x78, 0xb9, 0xfa } \
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}
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typedef struct _EFI_PEI_READ_ONLY_VARIABLE_PPI EFI_PEI_READ_ONLY_VARIABLE_PPI;
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//
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// Variable attributes
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//
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#define EFI_VARIABLE_NON_VOLATILE 0x00000001
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#define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x00000002
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#define EFI_VARIABLE_RUNTIME_ACCESS 0x00000004
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/**
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Get Variable value by Name and GUID pair
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@param PeiServices An indirect pointer to the PEI Services Table published by the PEI Foundation.
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@param VariableName A NULL-terminated Unicode string that is the name of the vendor's variable.
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@param VendorGuid A unique identifier for the vendor.
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@param Attributes If not NULL, a pointer to the memory location to return
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the attributes bitmask for the variable.
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@param DataSize On input, the size in bytes of the return Data buffer.
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On output, the size of data returned in Data.
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@param Data The buffer to return the contents of the variable.
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@retval EFI_SUCCESS The function completed successfully.
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@retval EFI_NOT_FOUND The variable was not found.
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@retval EFI_BUFFER_TOO_SMALL The BufferSize is too small for the result.
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@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
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@retval EFI_DEVICE_ERROR The variable could not be retrieved due to a hardware error.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_PEI_GET_VARIABLE)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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OUT UINT32 *Attributes OPTIONAL,
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IN OUT UINTN *DataSize,
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OUT VOID *Data
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);
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/**
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This function can be called multiple times to retrieve the VariableName
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and VendorGuid of all variables currently available in the system. On each call
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to GetNextVariableName() the previous results are passed into the interface,
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and on output the interface returns the next variable name data. When the
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entire variable list has been returned, the error EFI_NOT_FOUND is returned.
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@param PeiServices An indirect pointer to the PEI Services Table published by the PEI Foundation.
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@param VariableNameSize The size of the VariableName buffer.
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@param VariableName On input, supplies the last VariableName that was
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returned by GetNextVariableName(). On output, returns the Null-terminated
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Unicode string of the current variable.
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@param VendorGuid On input, supplies the last VendorGuid that was
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returned by GetNextVariableName(). On output, returns the VendorGuid
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of the current variable.
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@retval EFI_SUCCESS The function completed successfully.
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@retval EFI_NOT_FOUND The next variable was not found.
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@retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the result.
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@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
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@retval EFI_DEVICE_ERROR The variable name could not be retrieved due to a hardware 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_NAME)(
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IN EFI_PEI_SERVICES **PeiServices,
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IN OUT UINTN *VariableNameSize,
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IN OUT CHAR16 *VariableName,
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IN OUT EFI_GUID *VendorGuid
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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_VARIABLE_PPI {
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EFI_PEI_GET_VARIABLE GetVariable; ///< A service to ascertain a given variable name.
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EFI_PEI_GET_NEXT_VARIABLE_NAME GetNextVariableName; ///< A service to ascertain a variable based upon a given, known variable
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};
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extern EFI_GUID gEfiPeiReadOnlyVariablePpiGuid;
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#endif
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