841014ba97
1. record the distance of two neighboring VAR_ADDED type variables rather than the offset of each variable. As the field recording this info is UINT16 width, the latter causes in IA32/X64 platform, it can only cache those variables from offset 0 to offset 2^16; in IPF platform, from offset 0 to offset 2^18(extend the scope by left-shift the offset two bits). when taking the former algorithm, the max range of caching variable is from offset 0 to offset 122*(2^16) git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8625 6f19259b-4bc3-4df7-8a09-765794883524
157 lines
6.2 KiB
C
157 lines
6.2 KiB
C
/** @file
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The internal header file includes the common header files, defines
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internal structure and functions used by PeiVariable module.
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Copyright (c) 2006 - 2008, 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_VARIABLE_H_
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#define _PEI_VARIABLE_H_
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#include <PiPei.h>
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#include <Ppi/ReadOnlyVariable2.h>
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#include <Library/DebugLib.h>
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#include <Library/PeimEntryPoint.h>
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#include <Library/HobLib.h>
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#include <Library/PcdLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/PeiServicesTablePointerLib.h>
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#include <Library/PeiServicesLib.h>
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#include <Guid/VariableFormat.h>
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typedef struct {
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VARIABLE_HEADER *CurrPtr;
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VARIABLE_HEADER *EndPtr;
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VARIABLE_HEADER *StartPtr;
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} VARIABLE_POINTER_TRACK;
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#define VARIABLE_INDEX_TABLE_VOLUME 122
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#define EFI_VARIABLE_INDEX_TABLE_GUID \
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{ 0x8cfdb8c8, 0xd6b2, 0x40f3, { 0x8e, 0x97, 0x02, 0x30, 0x7c, 0xc9, 0x8b, 0x7c } }
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///
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/// Use this data structure to store variable-related info, which can decrease
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/// the cost of access to NV.
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///
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typedef struct {
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UINT16 Length;
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UINT16 GoneThrough;
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VARIABLE_HEADER *EndPtr;
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VARIABLE_HEADER *StartPtr;
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///
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/// This field is used to store the distance of two neighbouring VAR_ADDED type variables.
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/// The meaning of the field is implement-dependent.
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UINT16 Index[VARIABLE_INDEX_TABLE_VOLUME];
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} VARIABLE_INDEX_TABLE;
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//
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// Functions
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//
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/**
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Provide the functionality of the variable services.
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@param FileHandle Handle of the file being invoked.
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Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().
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@param PeiServices General purpose services available to every PEIM.
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@retval EFI_SUCCESS If the interface could be successfully installed
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@retval Others Returned from PeiServicesInstallPpi()
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**/
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EFI_STATUS
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EFIAPI
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PeimInitializeVariableServices (
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IN EFI_PEI_FILE_HANDLE FileHandle,
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IN CONST EFI_PEI_SERVICES **PeiServices
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);
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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, the error
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EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer
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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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@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 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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EFI_STATUS
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EFIAPI
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PeiGetVariable (
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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
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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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@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 UEFI _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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EFI_STATUS
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EFIAPI
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PeiGetNextVariableName (
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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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#endif
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