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MdeModulePkg: Update PeiCore to handle specific child FV 

Child FV may be placed in parent FV image without process required. Then,
Child FV and parent FV will be in the same continuous space. For FileHandle,
FileHandleToVolume() function needs to find the best matched FV handle.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17704 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Liming Gao 2015-06-25 03:29:38 +00:00 committed by lgao4
parent ff0c6d6617
commit 01d3a5703f
1 changed files with 20 additions and 2 deletions
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22
MdeModulePkg/Core/Pei/FwVol/FwVol.c
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@ -1,7 +1,7 @@
/** @file
Pei Core Firmware File System service routines.
Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
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
@ -203,16 +203,34 @@ FileHandleToVolume (
UINTN Index;
PEI_CORE_INSTANCE *PrivateData;
EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
UINTN BestIndex;
PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS (GetPeiServicesTablePointer ());
BestIndex = PrivateData->FvCount;
//
// Find the best matched FV image that includes this FileHandle.
// FV may include the child FV, and they are in the same continuous space.
// If FileHandle is from the child FV, the updated logic can find its matched FV.
//
for (Index = 0; Index < PrivateData->FvCount; Index++) {
FwVolHeader = PrivateData->Fv[Index].FvHeader;
if (((UINT64) (UINTN) FileHandle > (UINT64) (UINTN) FwVolHeader ) && \
((UINT64) (UINTN) FileHandle <= ((UINT64) (UINTN) FwVolHeader + FwVolHeader->FvLength - 1))) {
return &PrivateData->Fv[Index];
if (BestIndex == PrivateData->FvCount) {
BestIndex = Index;
} else {
if ((UINT64) (UINTN) PrivateData->Fv[BestIndex].FvHeader < (UINT64) (UINTN) FwVolHeader) {
BestIndex = Index;
}
}
}
}
if (BestIndex < PrivateData->FvCount) {
return &PrivateData->Fv[BestIndex];
}
return NULL;
}