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/*
* 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.
*/
#include <AK/ByteBuffer.h>
#include <Kernel/Devices/GPTPartitionTable.h>
#ifndef GPT_DEBUG
# define GPT_DEBUG
#endif
namespace Kernel {
GPTPartitionTable::GPTPartitionTable(BlockDevice& device)
: m_device(move(device))
{
}
GPTPartitionTable::~GPTPartitionTable()
{
}
const GPTPartitionHeader& GPTPartitionTable::header() const
{
return *reinterpret_cast<const GPTPartitionHeader*>(m_cached_header);
}
bool GPTPartitionTable::initialize()
{
auto header_buffer = UserOrKernelBuffer::for_kernel_buffer(m_cached_header);
if (!m_device->read_block(1, header_buffer)) {
return false;
}
auto& header = this->header();
#ifdef GPT_DEBUG
klog() << "GPTPartitionTable::initialize: gpt_signature=0x" << String::format("%x", header.sig[1]) << String::format("%x", header.sig[0]);
#endif
if (header.sig[0] != GPT_SIGNATURE && header.sig[1] != GPT_SIGNATURE2) {
klog() << "GPTPartitionTable::initialize: bad GPT signature 0x" << String::format("%x", header.sig[1]) << String::format("%x", header.sig[0]);
return false;
}
return true;
}
RefPtr<DiskPartition> GPTPartitionTable::partition(unsigned index)
{
ASSERT(index >= 1 && index <= 4294967294);
auto& header = this->header();
unsigned lba = header.partition_array_start_lba + (((index - 1) * header.partition_entry_size) / BytesPerSector);
if (header.sig[0] != GPT_SIGNATURE) {
klog() << "GPTPartitionTable::initialize: bad gpt signature - not initalized? 0x" << String::format("%x", header.sig);
return nullptr;
}
u8 entries_per_sector = BytesPerSector / header.partition_entry_size;
GPTPartitionEntry entries[entries_per_sector];
auto entries_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&entries);
this->m_device->read_blocks(lba, 1, entries_buffer);
GPTPartitionEntry& entry = entries[((index - 1) % entries_per_sector)];
#ifdef GPT_DEBUG
klog() << "GPTPartitionTable::partition " << index;
klog() << "GPTPartitionTable - offset = " << entry.first_lba[1] << entry.first_lba[0];
#endif
if (entry.first_lba[0] == 0x00) {
#ifdef GPT_DEBUG
klog() << "GPTPartitionTable::partition: missing partition requested index=" << index;
#endif
return nullptr;
}
#ifdef GPT_DEBUG
klog() << "GPTPartitionTable::partition: found partition index=" << index << " type=" << String::format("%x", entry.partition_guid[3]) << "-" << String::format("%x", entry.partition_guid[2]) << "-" << String::format("%x", entry.partition_guid[1]) << "-" << String::format("%x", entry.partition_guid[0]);
#endif
return DiskPartition::create(m_device, entry.first_lba[0], entry.last_lba[0]);
}
}
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