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OvmfPkg/Sec: Add FindFfsSectionInstance 

This allow you to search for an 'instance' of a section
within a series of FFS sections.

For example, we will split the MAINFV into a PEI and DXE
FV, and then compress those two FV's together within a
FFS FV file. The DXE FV will appear as the second section
of the file, and therefore we will search for it using
an Instance=1 value.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15150 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jordan Justen 2014-01-21 19:39:04 +00:00 committed by jljusten
parent b6f564a763
commit 4b4b783dbe
1 changed files with 43 additions and 3 deletions
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46
OvmfPkg/Sec/SecMain.c
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@ -128,9 +128,13 @@ FindMainFv (
Locates a section within a series of sections
with the specified section type.
The Instance parameter indicates which instance of the section
type to return. (0 is first instance, 1 is second...)
@param[in] Sections The sections to search
@param[in] SizeOfSections Total size of all sections
@param[in] SectionType The section type to locate
@param[in] Instance The section instance number
@param[out] FoundSection The FFS section if found
@retval EFI_SUCCESS The file and section was found
@ -139,10 +143,11 @@ FindMainFv (
**/
EFI_STATUS
FindFfsSectionInSections (
FindFfsSectionInstance (
IN VOID *Sections,
IN UINTN SizeOfSections,
IN EFI_SECTION_TYPE SectionType,
IN UINTN Instance,
OUT EFI_COMMON_SECTION_HEADER **FoundSection
)
{
@ -182,14 +187,49 @@ FindFfsSectionInSections (
// Look for the requested section type
//
if (Section->Type == SectionType) {
*FoundSection = Section;
return EFI_SUCCESS;
if (Instance == 0) {
*FoundSection = Section;
return EFI_SUCCESS;
} else {
Instance--;
}
}
}
return EFI_NOT_FOUND;
}
/**
Locates a section within a series of sections
with the specified section type.
@param[in] Sections The sections to search
@param[in] SizeOfSections Total size of all sections
@param[in] SectionType The section type to locate
@param[out] FoundSection The FFS section if found
@retval EFI_SUCCESS The file and section was found
@retval EFI_NOT_FOUND The file and section was not found
@retval EFI_VOLUME_CORRUPTED The firmware volume was corrupted
**/
EFI_STATUS
FindFfsSectionInSections (
IN VOID *Sections,
IN UINTN SizeOfSections,
IN EFI_SECTION_TYPE SectionType,
OUT EFI_COMMON_SECTION_HEADER **FoundSection
)
{
return FindFfsSectionInstance (
Sections,
SizeOfSections,
SectionType,
0,
FoundSection
);
}
/**
Locates a FFS file with the specified file type and a section
within that file with the specified section type.