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/*++
Copyright (c) 2006 - 2008, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
FindFv.c
Abstract:
Library function to find fv by hob.
--*/
#include "Tiano.h"
#include "Pei.h"
#include "PeiLib.h"
#include "PeiHobLib.h"
#include "EfiCommonLib.h"
#include EFI_GUID_DEFINITION (FirmwareFileSystem)
static
VOID *
FindFvGetHob (
IN UINT16 Type,
IN VOID *HobStart
)
/*++
Routine Description:
This function returns the first instance of a HOB type in a HOB list.
Arguments:
Type The HOB type to return.
HobStart The first HOB in the HOB list.
Returns:
HobStart There were no HOBs found with the requested type.
else Returns the first HOB with the matching type.
--*/
{
EFI_PEI_HOB_POINTERS Hob;
Hob.Raw = HobStart;
//
// Return input if not found
//
if (HobStart == NULL) {
return HobStart;
}
//
// Parse the HOB list, stop if end of list or matching type found.
//
while (!END_OF_HOB_LIST (Hob)) {
if (Hob.Header->HobType == Type) {
break;
}
Hob.Raw = GET_NEXT_HOB (Hob);
}
//
// Return input if not found
//
if (END_OF_HOB_LIST (Hob)) {
return HobStart;
}
return (VOID *) (Hob.Raw);
}
EFI_STATUS
EFIAPI
FindFv (
IN EFI_FIND_FV_PPI *This,
IN EFI_PEI_SERVICES **PeiServices,
IN OUT UINT8 *FvNumber,
IN OUT EFI_FIRMWARE_VOLUME_HEADER **FvAddress
)
/*++
Routine Description:
Search Fv which supports FFS.
Arguments:
This - Interface pointer that implement the Find Fv PPI
PeiServices - Pointer to the PEI Service Table
FvNumber - On input, the number of the fireware volume which supports FFS to locate
On output, the next FV number which supports FFS.
FVAddress - The address of the volume which supports FFS to discover
Returns:
EFI_SUCCESS - An addtional FV which supports FFS found
EFI_OUT_OF_RESOURCES - There are no fireware volume which supports FFS for given fvnumber
EFI_INVALID_PARAMETER - FvAddress is NULL
--*/
{
EFI_STATUS Status;
EFI_PEI_HOB_POINTERS HobStart;
EFI_PEI_HOB_POINTERS Hob;
EFI_HOB_FIRMWARE_VOLUME *FvHob;
UINT8 FvIndex;
if (FvAddress == NULL){
return EFI_INVALID_PARAMETER;
}
Hob.Raw = NULL;
FvIndex = 0;
//
// Get the Hob table pointer
//
Status = (*PeiServices)->GetHobList (
PeiServices,
(VOID **) &HobStart.Raw
);
if (EFI_ERROR (Status)) {
return EFI_OUT_OF_RESOURCES;
}
//
// Loop to search the wanted FirmwareVolume which supports FFS
//
//
while (FvIndex <= *FvNumber) {
Hob.Raw = FindFvGetHob (EFI_HOB_TYPE_FV, HobStart.Raw);
//
// If the Hob is not EFI_HOB_TYPE_FV, it indicates that
// we have finished all FV volumes search, and there is no
// the FFS FV specified by FvNumber.
//
if (Hob.Header->HobType != EFI_HOB_TYPE_FV) {
*FvNumber = 0;
return EFI_OUT_OF_RESOURCES;
}
HobStart.Raw = Hob.Raw + Hob.Header->HobLength;
FvHob = Hob.FirmwareVolume;
*FvAddress = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvHob->BaseAddress);
//
// Check if the FV supports FFS
//
if (EfiCompareGuid (&((*FvAddress)->FileSystemGuid), &gEfiFirmwareFileSystemGuid)) {
FvIndex++;
}
}
//
// Return the next FV number which supports FFS.
//
(*FvNumber)++;
return EFI_SUCCESS;
}
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