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20a27a641b
This change moves the following functions into a dedicated file so they may be used in other variable files as needed. These are commonly needed for basic variable data structure parsing operations. The functions are grouped together in VariableParsing.c to support cohesiveness for these operations in the file. Furthermore, it reduces the overall size of the common Variable.c file. * DataSizeOfVariable () * FindVariableEx () * GetEndPointer () * GetNextVariablePtr () * GetStartPointer () * GetVariableDataOffset () * GetVariableDataPtr () * GetVariableHeaderSize () * GetVariableNamePtr () * GetVariableStoreStatus () * GetVendorGuidPtr () * IsValidVariableHeader () * NameSizeOfVariable () * SetDataSizeOfVariable () * SetNameSizeOfVariable () * UpdateVariableInfo () * VariableCompareTimeStampInternal () * VariableServiceGetNextVariableInternal () Cc: Dandan Bi <dandan.bi@intel.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Eric Dong <eric.dong@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Liming Gao <liming.gao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Michael Kubacki <michael.a.kubacki@intel.com> Reviewed-by: Jian J Wang <jian.j.wang@intel.com> Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
307 lines
7.8 KiB
C
307 lines
7.8 KiB
C
/** @file
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Functions in this module are associated with variable parsing operations and
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are intended to be usable across variable driver source files.
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Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _VARIABLE_PARSING_H_
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#define _VARIABLE_PARSING_H_
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#include <Guid/ImageAuthentication.h>
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#include "Variable.h"
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/**
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This code checks if variable header is valid or not.
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@param[in] Variable Pointer to the Variable Header.
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@param[in] VariableStoreEnd Pointer to the Variable Store End.
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@retval TRUE Variable header is valid.
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@retval FALSE Variable header is not valid.
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**/
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BOOLEAN
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IsValidVariableHeader (
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IN VARIABLE_HEADER *Variable,
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IN VARIABLE_HEADER *VariableStoreEnd
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);
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/**
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This code gets the current status of Variable Store.
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@param[in] VarStoreHeader Pointer to the Variable Store Header.
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@retval EfiRaw Variable store status is raw.
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@retval EfiValid Variable store status is valid.
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@retval EfiInvalid Variable store status is invalid.
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**/
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VARIABLE_STORE_STATUS
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GetVariableStoreStatus (
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IN VARIABLE_STORE_HEADER *VarStoreHeader
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);
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/**
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This code gets the size of variable header.
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@return Size of variable header in bytes in type UINTN.
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**/
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UINTN
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GetVariableHeaderSize (
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VOID
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);
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/**
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This code gets the size of name of variable.
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@param Variable Pointer to the Variable Header.
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@return UINTN Size of variable in bytes.
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**/
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UINTN
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NameSizeOfVariable (
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IN VARIABLE_HEADER *Variable
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);
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/**
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This code sets the size of name of variable.
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@param[in] Variable Pointer to the Variable Header.
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@param[in] NameSize Name size to set.
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**/
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VOID
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SetNameSizeOfVariable (
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IN VARIABLE_HEADER *Variable,
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IN UINTN NameSize
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);
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/**
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This code gets the size of variable data.
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@param Variable Pointer to the Variable Header.
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@return Size of variable in bytes.
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**/
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UINTN
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DataSizeOfVariable (
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IN VARIABLE_HEADER *Variable
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);
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/**
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This code sets the size of variable data.
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@param[in] Variable Pointer to the Variable Header.
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@param[in] DataSize Data size to set.
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**/
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VOID
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SetDataSizeOfVariable (
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IN VARIABLE_HEADER *Variable,
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IN UINTN DataSize
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);
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/**
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This code gets the pointer to the variable name.
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@param Variable Pointer to the Variable Header.
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@return Pointer to Variable Name which is Unicode encoding.
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**/
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CHAR16 *
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GetVariableNamePtr (
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IN VARIABLE_HEADER *Variable
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);
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/**
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This code gets the pointer to the variable guid.
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@param Variable Pointer to the Variable Header.
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@return A EFI_GUID* pointer to Vendor Guid.
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**/
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EFI_GUID *
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GetVendorGuidPtr (
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IN VARIABLE_HEADER *Variable
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);
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/**
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This code gets the pointer to the variable data.
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@param Variable Pointer to the Variable Header.
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@return Pointer to Variable Data.
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**/
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UINT8 *
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GetVariableDataPtr (
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IN VARIABLE_HEADER *Variable
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);
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/**
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This code gets the variable data offset related to variable header.
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@param Variable Pointer to the Variable Header.
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@return Variable Data offset.
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**/
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UINTN
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GetVariableDataOffset (
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IN VARIABLE_HEADER *Variable
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);
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/**
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This code gets the pointer to the next variable header.
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@param Variable Pointer to the Variable Header.
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@return Pointer to next variable header.
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**/
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VARIABLE_HEADER *
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GetNextVariablePtr (
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IN VARIABLE_HEADER *Variable
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);
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/**
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Gets the pointer to the first variable header in given variable store area.
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@param[in] VarStoreHeader Pointer to the Variable Store Header.
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@return Pointer to the first variable header.
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**/
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VARIABLE_HEADER *
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GetStartPointer (
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IN VARIABLE_STORE_HEADER *VarStoreHeader
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);
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/**
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Gets the pointer to the end of the variable storage area.
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This function gets pointer to the end of the variable storage
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area, according to the input variable store header.
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@param[in] VarStoreHeader Pointer to the Variable Store Header.
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@return Pointer to the end of the variable storage area.
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**/
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VARIABLE_HEADER *
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GetEndPointer (
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IN VARIABLE_STORE_HEADER *VarStoreHeader
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);
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/**
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Compare two EFI_TIME data.
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@param[in] FirstTime A pointer to the first EFI_TIME data.
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@param[in] SecondTime A pointer to the second EFI_TIME data.
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@retval TRUE The FirstTime is not later than the SecondTime.
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@retval FALSE The FirstTime is later than the SecondTime.
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**/
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BOOLEAN
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VariableCompareTimeStampInternal (
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IN EFI_TIME *FirstTime,
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IN EFI_TIME *SecondTime
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);
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/**
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Find the variable in the specified variable store.
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@param[in] VariableName Name of the variable to be found
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@param[in] VendorGuid Vendor GUID to be found.
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@param[in] IgnoreRtCheck Ignore EFI_VARIABLE_RUNTIME_ACCESS attribute
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check at runtime when searching variable.
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@param[in, out] PtrTrack Variable Track Pointer structure that contains Variable Information.
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@retval EFI_SUCCESS Variable found successfully
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@retval EFI_NOT_FOUND Variable not found
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**/
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EFI_STATUS
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FindVariableEx (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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IN BOOLEAN IgnoreRtCheck,
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IN OUT VARIABLE_POINTER_TRACK *PtrTrack
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);
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/**
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This code Finds the Next available variable.
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Caution: This function may receive untrusted input.
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This function may be invoked in SMM mode. This function will do basic validation, before parse the data.
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@param[in] VariableName Pointer to variable name.
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@param[in] VendorGuid Variable Vendor Guid.
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@param[out] VariablePtr Pointer to variable header address.
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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_INVALID_PARAMETER If VariableName is not an empty string, while VendorGuid is NULL.
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@retval EFI_INVALID_PARAMETER The input values of VariableName and VendorGuid are not a name and
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GUID of an existing variable.
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**/
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EFI_STATUS
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EFIAPI
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VariableServiceGetNextVariableInternal (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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OUT VARIABLE_HEADER **VariablePtr
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);
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/**
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Routine used to track statistical information about variable usage.
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The data is stored in the EFI system table so it can be accessed later.
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VariableInfo.efi can dump out the table. Only Boot Services variable
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accesses are tracked by this code. The PcdVariableCollectStatistics
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build flag controls if this feature is enabled.
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A read that hits in the cache will have Read and Cache true for
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the transaction. Data is allocated by this routine, but never
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freed.
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@param[in] VariableName Name of the Variable to track.
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@param[in] VendorGuid Guid of the Variable to track.
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@param[in] Volatile TRUE if volatile FALSE if non-volatile.
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@param[in] Read TRUE if GetVariable() was called.
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@param[in] Write TRUE if SetVariable() was called.
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@param[in] Delete TRUE if deleted via SetVariable().
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@param[in] Cache TRUE for a cache hit.
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**/
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VOID
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UpdateVariableInfo (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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IN BOOLEAN Volatile,
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IN BOOLEAN Read,
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IN BOOLEAN Write,
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IN BOOLEAN Delete,
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IN BOOLEAN Cache
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);
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#endif
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