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/** @file
Routines supporting partition discovery and
logical device reading
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "FatLitePeim.h"
/**
This function finds Eltorito partitions. Main algorithm
is ported from DXE partition driver.
@param[in] PrivateData The global memory map
@param[in] ParentBlockDevNo The parent block device
@retval TRUE New partitions are detected and logical block devices
are added to block device array
@retval FALSE No new partitions are added
**/
BOOLEAN
FatFindEltoritoPartitions (
IN PEI_FAT_PRIVATE_DATA *PrivateData,
IN UINTN ParentBlockDevNo
);
/**
This function finds Mbr partitions. Main algorithm
is ported from DXE partition driver.
@param[in] PrivateData The global memory map
@param[in] ParentBlockDevNo The parent block device
@retval TRUE New partitions are detected and logical block devices
are added to block device array
@retval FALSE No new partitions are added
**/
BOOLEAN
FatFindMbrPartitions (
IN PEI_FAT_PRIVATE_DATA *PrivateData,
IN UINTN ParentBlockDevNo
);
/**
This function is used for finding GPT partition on block device.
As follow UEFI spec we should check protective MBR first and then
try to check both primary/backup GPT structures.
@param[in] PrivateData The global memory map
@param[in] ParentBlockDevNo The parent block device
@retval TRUE New partitions are detected and logical block devices
are added to block device array
@retval FALSE No new partitions are added
**/
BOOLEAN
FatFindGptPartitions (
IN PEI_FAT_PRIVATE_DATA *PrivateData,
IN UINTN ParentBlockDevNo
);
/**
This function finds partitions (logical devices) in physical block devices.
@param PrivateData Global memory map for accessing global variables.
**/
VOID
FatFindPartitions (
IN PEI_FAT_PRIVATE_DATA *PrivateData
)
{
BOOLEAN Found;
UINTN Index;
do {
Found = FALSE;
for (Index = 0; Index < PrivateData->BlockDeviceCount; Index++) {
if (!PrivateData->BlockDevice[Index].PartitionChecked) {
if (FatFindGptPartitions (PrivateData, Index)) {
Found = TRUE;
continue;
}
if (FatFindMbrPartitions (PrivateData, Index)) {
Found = TRUE;
continue;
}
if (FatFindEltoritoPartitions (PrivateData, Index)) {
Found = TRUE;
continue;
}
}
}
} while (Found && PrivateData->BlockDeviceCount <= PEI_FAT_MAX_BLOCK_DEVICE);
}
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