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110 lines
4.0 KiB
C++
110 lines
4.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/ByteBuffer.h>
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#include <Kernel/Devices/GPTPartitionTable.h>
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#ifndef GPT_DEBUG
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# define GPT_DEBUG
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#endif
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namespace Kernel {
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GPTPartitionTable::GPTPartitionTable(BlockDevice& device)
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: m_device(move(device))
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{
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}
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GPTPartitionTable::~GPTPartitionTable()
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{
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}
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const GPTPartitionHeader& GPTPartitionTable::header() const
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{
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return *reinterpret_cast<const GPTPartitionHeader*>(m_cached_header);
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}
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bool GPTPartitionTable::initialize()
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{
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auto header_buffer = UserOrKernelBuffer::for_kernel_buffer(m_cached_header);
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if (!m_device->read_block(1, header_buffer)) {
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return false;
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}
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auto& header = this->header();
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#ifdef GPT_DEBUG
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klog() << "GPTPartitionTable::initialize: gpt_signature=0x" << String::format("%x", header.sig[1]) << String::format("%x", header.sig[0]);
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#endif
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if (header.sig[0] != GPT_SIGNATURE && header.sig[1] != GPT_SIGNATURE2) {
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klog() << "GPTPartitionTable::initialize: bad GPT signature 0x" << String::format("%x", header.sig[1]) << String::format("%x", header.sig[0]);
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return false;
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}
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return true;
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}
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RefPtr<DiskPartition> GPTPartitionTable::partition(unsigned index)
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{
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ASSERT(index >= 1 && index <= 4294967294);
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auto& header = this->header();
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unsigned lba = header.partition_array_start_lba + (((index - 1) * header.partition_entry_size) / BytesPerSector);
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if (header.sig[0] != GPT_SIGNATURE) {
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klog() << "GPTPartitionTable::initialize: bad gpt signature - not initialized? 0x" << String::format("%x", header.sig);
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return nullptr;
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}
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u8 entries_per_sector = BytesPerSector / header.partition_entry_size;
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GPTPartitionEntry entries[entries_per_sector];
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auto entries_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&entries);
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this->m_device->read_blocks(lba, 1, entries_buffer);
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GPTPartitionEntry& entry = entries[((index - 1) % entries_per_sector)];
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#ifdef GPT_DEBUG
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klog() << "GPTPartitionTable::partition " << index;
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klog() << "GPTPartitionTable - offset = " << entry.first_lba[1] << entry.first_lba[0];
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#endif
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if (entry.first_lba[0] == 0x00) {
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#ifdef GPT_DEBUG
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klog() << "GPTPartitionTable::partition: missing partition requested index=" << index;
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#endif
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return nullptr;
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}
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#ifdef GPT_DEBUG
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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]);
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#endif
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return DiskPartition::create(m_device, entry.first_lba[0], entry.last_lba[0]);
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}
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}
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