1cc8ee7861
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2313 6f19259b-4bc3-4df7-8a09-765794883524
489 lines
13 KiB
C
489 lines
13 KiB
C
/*++
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Copyright (c) 2006, 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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Module Name:
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IfrVariable.c
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Abstract:
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Variable/Map manipulations routines
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--*/
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VOID
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EfiLibHiiVariablePackGetMap (
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IN EFI_HII_VARIABLE_PACK *Pack,
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OUT CHAR16 **Name, OPTIONAL
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OUT EFI_GUID **Guid, OPTIONAL
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OUT UINT16 *Id, OPTIONAL
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OUT VOID **Var, OPTIONAL
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OUT UINTN *Size OPTIONAL
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)
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/*++
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Routine Description:
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Extracts a variable form a Pack.
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Arguments:
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Pack - List of variables
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Name - Name of the variable/map
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Guid - GUID of the variable/map
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Var - Pointer to the variable/map
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Size - Size of the variable/map in bytes
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Returns:
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VOID
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--*/
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{
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if (NULL != Name) {
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*Name = (VOID *) (Pack + 1);
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}
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if (NULL != Guid) {
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*Guid = (EFI_GUID *)(UINTN)&Pack->VariableGuid;
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}
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if (NULL != Id) {
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*Id = Pack->VariableId;
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}
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if (NULL != Var) {
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*Var = (VOID *) ((CHAR8 *) (Pack + 1) + Pack->VariableNameLength);
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}
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if (NULL != Size) {
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*Size = Pack->Header.Length - sizeof (*Pack) - Pack->VariableNameLength;
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}
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}
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UINTN
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EfiLibHiiVariablePackListGetMapCnt (
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IN EFI_HII_VARIABLE_PACK_LIST *List
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)
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/*++
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Routine Description:
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Finds a count of the variables/maps in the List.
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Arguments:
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List - List of variables
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Returns:
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UINTN - The number of map count.
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--*/
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{
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UINTN Cnt = 0;
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while (NULL != List) {
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Cnt++;
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List = List->NextVariablePack;
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}
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return Cnt;
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}
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VOID
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EfiLibHiiVariablePackListForEachVar (
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IN EFI_HII_VARIABLE_PACK_LIST *List,
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IN EFI_LIB_HII_VARIABLE_PACK_LIST_CALLBACK *Callback
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)
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/*++
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Routine Description:
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Will iterate all variable/maps as appearing
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in List and for each, it will call the Callback.
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Arguments:
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List - List of variables
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Callback - Routine to be called for each iterated variable.
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Returns:
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VOID
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--*/
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{
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CHAR16 *MapName;
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EFI_GUID *MapGuid;
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UINT16 MapId;
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VOID *Map;
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UINTN MapSize;
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while (NULL != List) {
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EfiLibHiiVariablePackGetMap (List->VariablePack, &MapName, &MapGuid, &MapId, &Map, &MapSize);
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//
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// call the callback
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//
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Callback (MapName, MapGuid, MapId, Map, MapSize);
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List = List->NextVariablePack;
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}
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}
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EFI_STATUS
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EfiLibHiiVariablePackListGetMapByIdx (
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IN UINTN Idx,
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IN EFI_HII_VARIABLE_PACK_LIST *List,
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OUT CHAR16 **Name, OPTIONAL
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OUT EFI_GUID **Guid, OPTIONAL
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OUT UINT16 *Id, OPTIONAL
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OUT VOID **Var,
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OUT UINTN *Size
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)
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/*++
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Routine Description:
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Finds a variable form List given
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the order number as appears in the List.
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Arguments:
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Idx - The index of the variable/map to retrieve
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List - List of variables
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Name - Name of the variable/map
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Guid - GUID of the variable/map
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Var - Pointer to the variable/map
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Size - Size of the variable/map in bytes
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Returns:
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EFI_SUCCESS - Variable is found, OUT parameters are valid
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EFI_NOT_FOUND - Variable is not found, OUT parameters are not valid
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--*/
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{
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CHAR16 *MapName;
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EFI_GUID *MapGuid;
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UINT16 MapId;
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VOID *Map;
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UINTN MapSize;
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while (NULL != List) {
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EfiLibHiiVariablePackGetMap (List->VariablePack, &MapName, &MapGuid, &MapId, &Map, &MapSize);
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if (0 == Idx--) {
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*Var = Map;
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*Size = MapSize;
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if (NULL != Name) {
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*Name = MapName;
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}
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if (NULL != Guid) {
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*Guid = MapGuid;
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}
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if (NULL != Id) {
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*Id = MapId;
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}
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return EFI_SUCCESS; // Map found
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}
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List = List->NextVariablePack;
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}
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//
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// If here, the map is not found
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//
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return EFI_NOT_FOUND;
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}
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EFI_STATUS
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EfiLibHiiVariablePackListGetMapById (
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IN UINT16 Id,
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IN EFI_HII_VARIABLE_PACK_LIST *List,
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OUT CHAR16 **Name, OPTIONAL
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OUT EFI_GUID **Guid, OPTIONAL
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OUT VOID **Var,
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OUT UINTN *Size
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)
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/*++
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Routine Description:
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Finds a variable form List given the
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order number as appears in the List.
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Arguments:
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Id - The ID of the variable/map to retrieve
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List - List of variables
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Name - Name of the variable/map
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Guid - GUID of the variable/map
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Var - Pointer to the variable/map
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Size - Size of the variable/map in bytes
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Returns:
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EFI_SUCCESS - Variable is found, OUT parameters are valid
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EFI_NOT_FOUND - Variable is not found, OUT parameters are not valid
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--*/
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{
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CHAR16 *MapName;
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EFI_GUID *MapGuid;
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UINT16 MapId;
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VOID *Map;
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UINTN MapSize;
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while (NULL != List) {
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EfiLibHiiVariablePackGetMap (List->VariablePack, &MapName, &MapGuid, &MapId, &Map, &MapSize);
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if (MapId == Id) {
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*Var = Map;
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*Size = MapSize;
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if (NULL != Name) {
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*Name = MapName;
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}
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if (NULL != Guid) {
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*Guid = MapGuid;
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}
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//
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// Map found
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//
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return EFI_SUCCESS;
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}
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List = List->NextVariablePack;
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}
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//
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// If here, the map is not found
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//
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return EFI_NOT_FOUND;
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}
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EFI_STATUS
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EfiLibHiiVariablePackListGetMap (
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IN EFI_HII_VARIABLE_PACK_LIST *List,
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IN CHAR16 *Name,
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IN EFI_GUID *Guid,
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OUT UINT16 *Id,
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OUT VOID **Var,
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OUT UINTN *Size
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)
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/*++
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Routine Description:
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Finds a variable form EFI_HII_VARIABLE_PACK_LIST given name and GUID.
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Arguments:
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List - List of variables
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Name - Name of the variable/map to be found
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Guid - GUID of the variable/map to be found
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Var - Pointer to the variable/map found
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Size - Size of the variable/map in bytes found
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Returns:
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EFI_SUCCESS - variable is found, OUT parameters are valid
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EFI_NOT_FOUND - variable is not found, OUT parameters are not valid
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--*/
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{
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VOID *Map;
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UINTN MapSize;
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UINT16 MapId;
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CHAR16 *MapName;
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EFI_GUID *MapGuid;
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while (NULL != List) {
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EfiLibHiiVariablePackGetMap (List->VariablePack, &MapName, &MapGuid, &MapId, &Map, &MapSize);
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if ((0 == StrCmp (Name, MapName)) && CompareGuid (Guid, MapGuid)) {
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*Id = MapId;
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*Var = Map;
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*Size = MapSize;
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return EFI_SUCCESS;
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}
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List = List->NextVariablePack;
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}
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//
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// If here, the map is not found
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//
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return EFI_NOT_FOUND;
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}
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EFI_STATUS
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EfiLibHiiVariableRetrieveFromNv (
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IN CHAR16 *Name,
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IN EFI_GUID *Guid,
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IN UINTN Size,
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OUT VOID **Var
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)
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/*++
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Routine Description:
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Finds out if a variable of specific Name/Guid/Size exists in NV.
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If it does, it will retrieve it into the Var.
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Arguments:
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Name, Guid, Size - Parameters of the variable to retrieve. Must match exactly.
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Var - Variable will be retrieved into buffer pointed by this pointer.
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If pointing to NULL, the buffer will be allocated. Caller is responsible for releasing the buffer.
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Returns:
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EFI_SUCCESS - The variable of exact Name/Guid/Size parameters was retrieved and written to Var.
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EFI_NOT_FOUND - The variable of this Name/Guid was not found in the NV.
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EFI_LOAD_ERROR - The variable in the NV was of different size, or NV API returned error.
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--*/
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{
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EFI_STATUS Status;
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UINTN SizeNv;
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//
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// Test for existence of the variable.
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//
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SizeNv = 0;
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Status = gRT->GetVariable (Name, Guid, NULL, &SizeNv, NULL);
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if (EFI_BUFFER_TOO_SMALL != Status) {
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ASSERT (EFI_SUCCESS != Status);
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return EFI_NOT_FOUND;
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}
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if (SizeNv != Size) {
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//
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// The variable is considered corrupt, as it has different size from expected.
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//
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return EFI_LOAD_ERROR;
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}
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if (NULL == *Var) {
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*Var = AllocatePool (Size);
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ASSERT (NULL != *Var);
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}
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SizeNv = Size;
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//
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// Final read into the Var
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//
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Status = gRT->GetVariable (Name, Guid, NULL, &SizeNv, *Var);
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//
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// No tolerance for random failures. Such behavior is undetermined and not validated.
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//
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ASSERT_EFI_ERROR (Status);
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ASSERT (SizeNv == Size);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EfiLibHiiVariableOverrideIfSuffix (
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IN CHAR16 *Suffix,
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IN CHAR16 *Name,
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IN EFI_GUID *Guid,
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IN UINTN Size,
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OUT VOID *Var
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)
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/*++
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Routine Description:
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Overrrides the variable with NV data if found.
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But it only does it if the Name ends with specified Suffix.
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For example, if Suffix="MyOverride" and the Name="XyzSetupMyOverride",
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the Suffix matches the end of Name, so the variable will be loaded from NV
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provided the variable exists and the GUID and Size matches.
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Arguments:
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Suffix - Suffix the Name should end with.
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Name, Guid, Size - Parameters of the variable to retrieve. Must match exactly.
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Var - Variable will be retrieved into this buffer.
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Caller is responsible for providing storage of exactly Size size in bytes.
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Returns:
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EFI_SUCCESS - The variable was overriden with NV variable of same Name/Guid/Size.
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EFI_INVALID_PARAMETER - The name of the variable does not end with <Suffix>.
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EFI_NOT_FOUND - The variable of this Name/Guid was not found in the NV.
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EFI_LOAD_ERROR - The variable in the NV was of different size, or NV API returned error.
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--*/
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{
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UINTN StrLength;
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UINTN StrLenSuffix;
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StrLength = StrLen (Name);
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StrLenSuffix = StrLen (Suffix);
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if ((StrLength <= StrLenSuffix) || (0 != StrCmp (Suffix, &Name[StrLength - StrLenSuffix]))) {
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//
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// Not ending with <Suffix>.
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//
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return EFI_INVALID_PARAMETER;
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}
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return EfiLibHiiVariableRetrieveFromNv (Name, Guid, Size, &Var);
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}
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EFI_STATUS
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EfiLibHiiVariableOverrideBySuffix (
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IN CHAR16 *Suffix,
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IN CHAR16 *Name,
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IN EFI_GUID *Guid,
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IN UINTN Size,
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OUT VOID *Var
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)
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/*++
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Routine Description:
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Overrrides the variable with NV data if found.
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But it only does it if the NV contains the same variable with Name is appended with Suffix.
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For example, if Suffix="MyOverride" and the Name="XyzSetup",
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the Suffix will be appended to the end of Name, and the variable with Name="XyzSetupMyOverride"
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will be loaded from NV provided the variable exists and the GUID and Size matches.
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Arguments:
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Suffix - Suffix the variable will be appended with.
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Name, Guid, Size - Parameters of the variable to retrieve. Must match exactly.
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Var - Variable will be retrieved into this buffer.
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Caller is responsible for providing storage of exactly Size size in bytes.
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Returns:
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EFI_SUCCESS - The variable was overriden with NV variable of same Name/Guid/Size.
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EFI_NOT_FOUND - The variable of this Name/Guid was not found in the NV.
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EFI_LOAD_ERROR - The variable in the NV was of different size, or NV API returned error.
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--*/
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{
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EFI_STATUS Status;
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CHAR16 *NameSuffixed;
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UINTN NameLength;
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UINTN SuffixLength;
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//
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// enough to concatenate both strings.
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//
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NameLength = StrLen (Name);
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SuffixLength = StrLen (Suffix);
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NameSuffixed = AllocateZeroPool ((NameLength + SuffixLength + 1) * sizeof (CHAR16));
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StrCpy (NameSuffixed, Name);
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StrCat (NameSuffixed, Suffix);
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Status = EfiLibHiiVariableRetrieveFromNv (NameSuffixed, Guid, Size, &Var);
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gBS->FreePool (NameSuffixed);
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return Status;
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}
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