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