On Feb 13, 2014, at 4:34 AM, ASM <[email protected]> wrote:
> Hi folks!
>
> I am writing bootloader.
>
> The bootloader need to found all GPT partition with vendor GUID.
>
> I can to get all Handles of DiskIO protocol.
> I can to get a Path protocol and select only MEDIA_DEVICE_PATH,
> MEDIA_HARDDRIVE_DP.
>> From PathDev I can to get all UniquePartitionGUID.
> But how can get PartitionTypeGUID?
>
> I can see one way:
> * find a partition.
> * find a parent handle of the partition
> * read PrimaryHeader
> * find in the EFI_PARTITION_ENTRYs a UniquePartitionGUID that equal
> the partition UniquePartitionGUID.
> * save PartitionTypeGUID if it was found
>
> How can I do it more simple?
>
The partition driver has example code of how to do what you need.
You will notice that the partition driver does not produce BlockIo protocols
for OS Specific partitions. So I can’t think of any shortcut for you.
https://svn.code.sf.net/p/edk2/code/trunk/edk2/MdeModulePkg/Universal/Disk/PartitionDxe/Gpt.c,
if ((Entry->Attributes & BIT1) != 0) {
//
// If Bit 1 is set, this indicate that this is an OS specific GUID
partition.
//
PEntryStatus[Index1].OsSpecific = TRUE;
}
...
for (Index = 0; Index < PrimaryHeader->NumberOfPartitionEntries; Index++) {
Entry = (EFI_PARTITION_ENTRY *) ((UINT8 *) PartEntry + Index *
PrimaryHeader->SizeOfPartitionEntry);
if (CompareGuid (&Entry->PartitionTypeGUID, &gEfiPartTypeUnusedGuid) ||
PEntryStatus[Index].OutOfRange ||
PEntryStatus[Index].Overlap ||
PEntryStatus[Index].OsSpecific
) {
//
// Don't use null EFI Partition Entries, Invalid Partition Entries or OS
specific
// partition Entries
//
continue;
}
Thanks,
Andrew Fish
> ---
> Best regards,
> Leonid Myravjev
>
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