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Add new API GetSectionFromAnyFvByFileType() into MdePkg DxeServicesLib. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10456 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
lgao4 2010-05-05 01:56:41 +00:00
parent 2b649f7477
commit 682cee4c06
3 changed files with 185 additions and 1 deletions
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50
MdePkg/Include/Library/DxeServicesLib.h
View File

@ -16,6 +16,56 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#ifndef __DXE_SERVICES_LIB_H__
#define __DXE_SERVICES_LIB_H__
/**
Searches all the available firmware volumes and returns the first matching FFS section.
This function searches all the firmware volumes for FFS files with FV file type specified by FileType
The order that the firmware volumes is searched is not deterministic. For each available FV a search
is made for FFS file of type FileType. If the FV contains more than one FFS file with the same FileType,
the FileInstance instance will be the matched FFS file. For each FFS file found a search
is made for FFS sections of type SectionType. If the FFS file contains at least SectionInstance instances
of the FFS section specified by SectionType, then the SectionInstance instance is returned in Buffer.
Buffer is allocated using AllocatePool(), and the size of the allocated buffer is returned in Size.
It is the caller's responsibility to use FreePool() to free the allocated buffer.
See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for details on how sections
are retrieved from an FFS file based on SectionType and SectionInstance.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param FileType Indicates the FV file type to search for within all available FVs.
@param FileInstance Indicates which file instance within all available FVs specified by FileType.
FileInstance starts from zero.
@param SectionType Indicates the FFS section type to search for within the FFS file
specified by FileType with FileInstance.
@param SectionInstance Indicates which section instance within the FFS file
specified by FileType with FileInstance to retrieve. SectionInstance starts from zero.
@param Buffer On output, a pointer to a callee allocated buffer containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the firmware volume that
contains the matching FFS section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromAnyFvByFileType (
IN EFI_FV_FILETYPE FileType,
IN UINTN FileInstance,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
);
/**
Searches all the available firmware volumes and returns the first matching FFS section.

134
MdePkg/Library/DxeServicesLib/DxeServicesLib.c
View File

@ -166,7 +166,141 @@ InternalGetSectionFromFv (
return Status;
}
/**
Searches all the available firmware volumes and returns the first matching FFS section.
This function searches all the firmware volumes for FFS files with FV file type specified by FileType
The order that the firmware volumes is searched is not deterministic. For each available FV a search
is made for FFS file of type FileType. If the FV contains more than one FFS file with the same FileType,
the FileInstance instance will be the matched FFS file. For each FFS file found a search
is made for FFS sections of type SectionType. If the FFS file contains at least SectionInstance instances
of the FFS section specified by SectionType, then the SectionInstance instance is returned in Buffer.
Buffer is allocated using AllocatePool(), and the size of the allocated buffer is returned in Size.
It is the caller's responsibility to use FreePool() to free the allocated buffer.
See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for details on how sections
are retrieved from an FFS file based on SectionType and SectionInstance.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param FileType Indicates the FV file type to search for within all available FVs.
@param FileInstance Indicates which file instance within all available FVs specified by FileType.
FileInstance starts from zero.
@param SectionType Indicates the FFS section type to search for within the FFS file
specified by FileType with FileInstance.
@param SectionInstance Indicates which section instance within the FFS file
specified by FileType with FileInstance to retrieve. SectionInstance starts from zero.
@param Buffer On output, a pointer to a callee allocated buffer containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the firmware volume that
contains the matching FFS section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromAnyFvByFileType (
IN EFI_FV_FILETYPE FileType,
IN UINTN FileInstance,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
EFI_STATUS Status;
EFI_HANDLE *HandleBuffer;
UINTN HandleCount;
UINTN IndexFv;
UINTN IndexFile;
UINTN Key;
EFI_GUID NameGuid;
EFI_FV_FILE_ATTRIBUTES Attributes;
EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv;
//
// Locate all available FVs.
//
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiFirmwareVolume2ProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Go through FVs one by one to find the required section data.
//
for (IndexFv = 0; IndexFv < HandleCount; IndexFv++) {
Status = gBS->HandleProtocol (
HandleBuffer[IndexFv],
&gEfiFirmwareVolume2ProtocolGuid,
(VOID **)&Fv
);
if (EFI_ERROR (Status)) {
continue;
}
//
// Use Firmware Volume 2 Protocol to search for a file of type FileType in all FVs.
//
IndexFile = FileInstance + 1;
Key = 0;
do {
Status = Fv->GetNextFile (Fv, &Key, &FileType, &NameGuid, &Attributes, Size);
if (EFI_ERROR (Status)) {
break;
}
IndexFile --;
} while (IndexFile > 0);
//
// Fv File with the required FV file type is found.
// Search the section file in the found FV file.
//
if (IndexFile == 0) {
Status = InternalGetSectionFromFv (
HandleBuffer[IndexFv],
&NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
if (!EFI_ERROR (Status)) {
goto Done;
}
}
}
//
// The required FFS section file is not found.
//
if (IndexFv == HandleCount) {
Status = EFI_NOT_FOUND;
}
Done:
if (HandleBuffer != NULL) {
FreePool(HandleBuffer);
}
return Status;
}
/**
Searches all the availables firmware volumes and returns the first matching FFS section.

2
MdePkg/Library/DxeServicesLib/DxeServicesLib.inf
View File

@ -21,7 +21,7 @@
FILE_GUID = EE680C58-FFC0-4a5d-858F-66FF9C84BC9F
MODULE_TYPE = DXE_DRIVER
VERSION_STRING = 1.0
LIBRARY_CLASS = DxeServicesLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER
LIBRARY_CLASS = DxeServicesLib|DXE_CORE DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER SMM_CORE UEFI_APPLICATION UEFI_DRIVER
#
# VALID_ARCHITECTURES = IA32 X64 IPF EBC