mirror of
https://github.com/RGBCube/serenity
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116 lines
3.7 KiB
C++
116 lines
3.7 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/MBRPartitionTable.h>
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#ifndef MBR_DEBUG
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# define MBR_DEBUG
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#endif
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namespace Kernel {
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MBRPartitionTable::MBRPartitionTable(NonnullRefPtr<BlockDevice> device)
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: m_device(move(device))
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{
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}
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MBRPartitionTable::~MBRPartitionTable()
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{
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}
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const MBRPartitionHeader& MBRPartitionTable::header() const
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{
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return *reinterpret_cast<const MBRPartitionHeader*>(m_cached_header);
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}
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bool MBRPartitionTable::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(0, 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 MBR_DEBUG
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klog() << "MBRPartitionTable::initialize: mbr_signature=0x" << String::format("%x", header.mbr_signature);
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#endif
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if (header.mbr_signature != MBR_SIGNATURE) {
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klog() << "MBRPartitionTable::initialize: bad mbr signature 0x" << String::format("%x", header.mbr_signature);
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return false;
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}
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return true;
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}
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bool MBRPartitionTable::contains_ebr() const
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{
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for (int i = 0; i < 4; i++) {
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if (header().entry[i].type == EBR_CHS_CONTAINER || header().entry[i].type == EBR_LBA_CONTAINER)
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return true;
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}
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return false;
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}
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bool MBRPartitionTable::is_protective_mbr() const
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{
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return header().entry[0].type == MBR_PROTECTIVE;
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}
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RefPtr<DiskPartition> MBRPartitionTable::partition(unsigned index)
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{
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ASSERT(index >= 1 && index <= 4);
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auto& header = this->header();
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auto& entry = header.entry[index - 1];
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if (header.mbr_signature != MBR_SIGNATURE) {
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klog() << "MBRPartitionTable::initialize: bad mbr signature - not initialized? 0x" << String::format("%x", header.mbr_signature);
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return nullptr;
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}
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#ifdef MBR_DEBUG
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klog() << "MBRPartitionTable::partition: status=0x" << String::format("%x", entry.status) << " offset=0x" << String::format("%x", entry.offset);
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#endif
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if (entry.offset == 0x00) {
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#ifdef MBR_DEBUG
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klog() << "MBRPartitionTable::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 MBR_DEBUG
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klog() << "MBRPartitionTable::partition: found partition index=" << index << " type=" << String::format("%x", entry.type);
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#endif
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return DiskPartition::create(m_device, entry.offset, (entry.offset + entry.length));
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}
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}
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