/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * 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/Types.h>
#include <AK/Vector.h>
#include <Kernel/Devices/DiskPartition.h>

namespace Kernel {

#define GPT_SIGNATURE2 0x54524150
#define GPT_SIGNATURE 0x20494645
#define BytesPerSector 512

struct [[gnu::packed]] GPTPartitionEntry
{
    u32 partition_guid[4];
    u32 unique_guid[4];

    u32 first_lba[2];
    u32 last_lba[2];

    u64 attributes;
    u8 partition_name[72];
};

struct [[gnu::packed]] GPTPartitionHeader
{
    u32 sig[2];
    u32 revision;
    u32 header_size;
    u32 crc32_header;
    u32 reserved;
    u64 current_lba;
    u64 backup_lba;

    u64 first_usable_lba;
    u64 last_usable_lba;

    u64 disk_guid1[2];

    u64 partition_array_start_lba;

    u32 entries_count;
    u32 partition_entry_size;
    u32 crc32_entries_array;
};

class GPTPartitionTable {

public:
    explicit GPTPartitionTable(BlockDevice&);
    ~GPTPartitionTable();

    bool initialize();
    RefPtr<DiskPartition> partition(unsigned index);

private:
    NonnullRefPtr<BlockDevice> m_device;

    const GPTPartitionHeader& header() const;

    u8 m_cached_header[512];
};

}