diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/FindFv.c')
-rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/FindFv.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/FindFv.c b/EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/FindFv.c new file mode 100644 index 0000000000..fcff7a648d --- /dev/null +++ b/EdkCompatibilityPkg/Foundation/Library/Pei/PeiLib/FindFv.c @@ -0,0 +1,179 @@ +/*++
+
+Copyright (c) 2006, 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 *
+GetHob (
+ 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
+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,
+ &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 = GetHob (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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