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alder_lake_bios/Insyde/InsydeModulePkg/Library/VariableSupportLib/VariableSupportLib.c

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/** @file
Common variable supports functions for user can extract whole variables
(including variable header) from variable store.
;******************************************************************************
;* Copyright (c) 2012 - 2019, Insyde Software Corp. All Rights Reserved.
;*
;* You may not reproduce, distribute, publish, display, perform, modify, adapt,
;* transmit, broadcast, present, recite, release, license or otherwise exploit
;* any part of this publication in any form, by any means, without the prior
;* written permission of Insyde Software Corporation.
;*
;******************************************************************************
*/
#include <Library/VariableSupportLib.h>
#include <Library/PcdLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BaseLib.h>
#include <Pi/PiFirmwareVolume.h>
/**
This code gets the current status of Variable Store.
@param[in] VarStoreHeader Pointer to the Variable Store Header.
@retval EfiRaw Variable store status is raw.
@retval EfiValid Variable store status is valid.
@retval EfiInvalid Variable store status is invalid.
**/
VARIABLE_STORE_STATUS
GetVariableStoreStatus (
IN CONST VARIABLE_STORE_HEADER *VarStoreHeader
)
{
ECP_VARIABLE_STORE_HEADER *EcpVarStoreHeader;
if (PcdGetBool (PcdUseEcpVariableStoreHeader)) {
EcpVarStoreHeader = (ECP_VARIABLE_STORE_HEADER *) VarStoreHeader;
if (EcpVarStoreHeader->Signature == ECP_VARIABLE_STORE_SIGNATURE &&
EcpVarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&
EcpVarStoreHeader->State == VARIABLE_STORE_HEALTHY
) {
return EfiValid;
}
if (EcpVarStoreHeader->Signature == 0xffffffff &&
EcpVarStoreHeader->Size == 0xffffffff &&
EcpVarStoreHeader->Format == 0xff &&
EcpVarStoreHeader->State == 0xff
) {
return EfiRaw;
} else {
return EfiInvalid;
}
} else {
if ((CompareGuid (&VarStoreHeader->Signature, &gEfiAuthenticatedVariableGuid) ||
CompareGuid (&VarStoreHeader->Signature, &gEfiVariableGuid)) &&
VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&
VarStoreHeader->State == VARIABLE_STORE_HEALTHY
) {
return EfiValid;
}
if (((UINT32 *)(&VarStoreHeader->Signature))[0] == 0xffffffff &&
((UINT32 *)(&VarStoreHeader->Signature))[1] == 0xffffffff &&
((UINT32 *)(&VarStoreHeader->Signature))[2] == 0xffffffff &&
((UINT32 *)(&VarStoreHeader->Signature))[3] == 0xffffffff &&
VarStoreHeader->Size == 0xffffffff &&
VarStoreHeader->Format == 0xff &&
VarStoreHeader->State == 0xff
) {
return EfiRaw;
} else {
return EfiInvalid;
}
}
}
/**
This code checks if variable header is valid or not.
@param[in] Variable Pointer to the Variable Header.
@retval TRUE Variable header is valid.
@retval FALSE Variable header is not valid.
**/
BOOLEAN
IsValidVariableHeader (
IN CONST VARIABLE_HEADER *Variable
)
{
if (Variable == NULL || Variable->StartId != VARIABLE_DATA) {
return FALSE;
}
if ((GetVariableStoreHeaderSize () + Variable->NameSize + Variable->DataSize) > MAX_VARIABLE_SIZE) {
return FALSE;
}
return TRUE;
}
/**
This code gets the size of name of variable.
@param[in] Variable Pointer to the Variable Header.
@return UINTN Size of variable in bytes.
**/
UINTN
NameSizeOfVariable (
IN CONST VARIABLE_HEADER *Variable
)
{
if (Variable->State == (UINT8) (-1) ||
Variable->DataSize == (UINT32) (-1) ||
Variable->NameSize == (UINT32) (-1) ||
Variable->Attributes == (UINT32) (-1)) {
return 0;
}
return (UINTN) Variable->NameSize;
}
/**
This code gets the pointer to the variable data.
@param[in] Variable Pointer to the Variable Header.
@retval NULL Variable start id is incorrect.
@return UINT8* Pointer to Variable Data.
**/
UINT8 *
GetVariableDataPtr (
IN CONST VARIABLE_HEADER *Variable
)
{
CHAR16 *VariableName;
if (Variable->StartId != VARIABLE_DATA) {
return NULL;
}
//
// Be careful about pad size for alignment
//
VariableName = GET_VARIABLE_NAME_PTR (Variable);
return (UINT8 *) ((UINTN) VariableName + Variable->NameSize + GET_PAD_SIZE (Variable->NameSize));
}
/**
This code gets the pointer to the next variable header.
@param[in] Variable Pointer to the Variable Header.
@return VARIABLE_HEADER* Pointer to next variable header.
**/
VARIABLE_HEADER *
GetNextVariablePtr (
IN CONST VARIABLE_HEADER *Variable
)
{
UINTN Value;
if (!IsValidVariableHeader (Variable)) {
return NULL;
}
//
// Be careful about pad size for alignment
//
Value = (UINTN) GetVariableDataPtr (Variable);
Value += Variable->DataSize;
Value += GET_PAD_SIZE (Variable->DataSize);
//
// Be careful about pad size for alignment.
//
return (VARIABLE_HEADER *) HEADER_ALIGN (Value);
}
/**
Gets the pointer to the first variable header in given variable store area.
@param[in] VarStoreHeader Pointer to the Variable Store Header.
@return VARIABLE_HEADER* Pointer to the first variable header.
**/
VARIABLE_HEADER *
GetStartPointer (
IN CONST VARIABLE_STORE_HEADER *VarStoreHeader
)
{
return (VARIABLE_HEADER *) HEADER_ALIGN (((UINT8 *) VarStoreHeader) + GetVariableStoreHeaderSize ());
}
/**
Gets the pointer to the end of the variable storage area.
This function gets pointer to the end of the variable storage
area, according to the input variable store header.
@param[in] VarStoreHeader Pointer to the Variable Store Header.
@return VARIABLE_HEADER* Pointer to the end of the variable storage area.
**/
VARIABLE_HEADER *
GetEndPointer (
IN CONST VARIABLE_STORE_HEADER *VarStoreHeader
)
{
return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + GetVariableStoreSize (VarStoreHeader));
}
/**
This code gets the size of variable data.
@param[in] Variable Pointer to the Variable Header.
@return UINTN Size of variable in bytes.
**/
UINTN
DataSizeOfVariable (
IN CONST VARIABLE_HEADER *Variable
)
{
if (Variable->State == (UINT8) (-1) ||
Variable->DataSize == (UINT32) (-1) ||
Variable->NameSize == (UINT32) (-1) ||
Variable->Attributes == (UINT32) (-1)) {
return 0;
}
return (UINTN) Variable->DataSize;
}
/**
This code gets the size of variable store.
@param[in] VarStoreHeader Pointer to the Variable Store Header.
@return UINT32 Total size of variable store.
**/
UINT32
GetVariableStoreSize (
IN CONST VARIABLE_STORE_HEADER *VariableStoreHeader
)
{
if (PcdGetBool (PcdUseEcpVariableStoreHeader)) {
return ((ECP_VARIABLE_STORE_HEADER *) VariableStoreHeader)->Size;
} else {
return VariableStoreHeader->Size;
}
}
/**
Gets the size of variable store header.
@return UINTN size by byte of variable store header.
**/
UINTN
GetVariableStoreHeaderSize (
VOID
)
{
return PcdGetBool (PcdUseEcpVariableStoreHeader) ? sizeof (ECP_VARIABLE_STORE_HEADER) : sizeof (VARIABLE_STORE_HEADER);
}
/**
This code gets the Size of extension variable store header.
@param[in] VarStoreHeader Pointer to the Variable Store Header.
@return UINT16 Size of extension variable store header.
**/
UINT16
GetExtVariableHeaderSize (
IN CONST VARIABLE_STORE_HEADER *VariableStoreHeader
)
{
if (PcdGetBool (PcdUseEcpVariableStoreHeader)) {
return ((ECP_VARIABLE_STORE_HEADER *) VariableStoreHeader)->ExtHeaderSize;
} else {
return VariableStoreHeader->ExtHeaderSize;
}
}
/**
Helper function to get the Board ID from variable store header.
@param[in] VarStoreHeader Pointer to the Variable Store Header.
@return the board ID in this variable store.
**/
STATIC
H2O_BOARD_ID
GetBoardIdFromVariableStoreHeader (
IN CONST VARIABLE_STORE_HEADER *VariableStoreHeader
)
{
if (PcdGetBool (PcdUseEcpVariableStoreHeader)) {
return (UINT64)((ECP_VARIABLE_STORE_HEADER *) VariableStoreHeader)->BoardId;
} else {
return (UINT64)VariableStoreHeader->BoardId;
}
}
/**
Helper function to get the Board ID from variable store.
Get SKUID from EXT variable store header or variable store Header if EXT
variable store header doesn't exist.
@param[in] Buffer Pointer to variable store header.
@return the board ID in this variable store.
**/
H2O_BOARD_ID
GetBoardIdFromVariableStore (
IN CONST VARIABLE_STORE_HEADER *VariableStoreHeader
)
{
UINT32 Size;
UINT16 ExtHeaderSize;
EXT_VARIABLE_STORE_HEADER *ExtHeader;
ExtHeaderSize = GetExtVariableHeaderSize (VariableStoreHeader);
Size = GetVariableStoreSize (VariableStoreHeader);
if (ExtHeaderSize == 0 || Size < ExtHeaderSize) {
return GetBoardIdFromVariableStoreHeader (VariableStoreHeader);
}
ExtHeader = (EXT_VARIABLE_STORE_HEADER *)((UINT8 *)VariableStoreHeader + (Size - ExtHeaderSize));
return ExtHeader->BoardId;
}
/**
According to variable name and GUID to find this variable is whether in input buffer.
@param[in] VariableName Name of Variable to be found.
@param[in] VendorGuid Variable vendor GUID.
@param[in] Buffer Pointer to variable buffer.
@param[in] BufferSize the size in bytes of the buffer
@retval TRUE The function completed successfully.
@retval FALSE The function could not complete successfully.
**/
BOOLEAN
DoesVariableExist (
IN CONST CHAR16 *VariableName,
IN CONST EFI_GUID *VendorGuid,
IN CONST UINT8 *Buffer,
IN UINTN BufferSize
)
{
UINTN HeaderSize;
UINTN CurrentSearchedSize;
VARIABLE_HEADER *VariableHeader;
VARIABLE_HEADER *NexVariable;
BOOLEAN VariableFound;
VariableFound = FALSE;
if (VariableName == NULL || VendorGuid == NULL || Buffer == NULL) {
return VariableFound;
}
HeaderSize = sizeof (EFI_FIRMWARE_VOLUME_HEADER) + sizeof (EFI_FV_BLOCK_MAP_ENTRY) + GetVariableStoreHeaderSize ();
if (BufferSize < HeaderSize) {
return VariableFound;
}
VariableHeader = (VARIABLE_HEADER *) (Buffer + HeaderSize);
CurrentSearchedSize = HeaderSize;
while (IsValidVariableHeader (VariableHeader) && CurrentSearchedSize < BufferSize) {
NexVariable = GetNextVariablePtr (VariableHeader);
if (VariableHeader->State == VAR_ADDED && StrCmp (VariableName, GET_VARIABLE_NAME_PTR (VariableHeader)) == 0 &&
CompareGuid (VendorGuid, &VariableHeader->VendorGuid)) {
VariableFound = TRUE;
break;
}
CurrentSearchedSize += ((UINTN) NexVariable - (UINTN) VariableHeader);
VariableHeader = NexVariable;
}
return VariableFound;
}
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