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Partition Table: Add support for Extended partitions

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Now also MBR configurations with extended partitions are supported.
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Liav A 2020-02-01 23:28:39 +02:00 • committed by Andreas Kling
parent 8cde707931
commit 81544dc5b4
6 changed files with 302 additions and 10 deletions
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68
Kernel/Devices/EBRPartitionTable.h Normal file
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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/RefPtr.h>
#include <AK/Vector.h>
#include <Kernel/Devices/DiskDevice.h>
#include <Kernel/Devices/DiskPartition.h>
#include <Kernel/Devices/MBRPartitionTable.h>
struct [[gnu::packed]] EBRPartitionExtension
{
u8 unused_area[446];
MBRPartitionEntry entry;
MBRPartitionEntry next_chained_ebr_extension;
MBRPartitionEntry unused[2];
u16 mbr_signature;
};
class EBRPartitionTable {
public:
explicit EBRPartitionTable(NonnullRefPtr<DiskDevice>);
~EBRPartitionTable();
bool initialize();
RefPtr<DiskPartition> partition(unsigned index);
private:
int index_of_ebr_container() const;
NonnullRefPtr<DiskDevice> m_device;
const MBRPartitionHeader& header() const;
const EBRPartitionExtension& ebr_extension() const;
bool index_is_extended_partition(unsigned index) const;
RefPtr<DiskPartition> get_extended_partition(unsigned index);
RefPtr<DiskPartition> get_non_extended_partition(unsigned index);
u8 m_ebr_container_id { 0 };
size_t m_ebr_chained_extensions_count { 0 };
u8 m_cached_mbr_header[512];
u8 m_cached_ebr_header[512];
};