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/** @file
Routines supporting partition discovery and
logical device reading
Copyright (c) 2006 - 2019, 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
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#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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