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de49714f36
Also added a script to handle creation of GPT partitioned disk (with GRUB config file). Block limit will be used to disallow potential access to other partitions.
76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
#include <AK/ByteBuffer.h>
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#include <Kernel/Devices/GPTPartitionTable.h>
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#define GPT_DEBUG
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GPTPartitionTable::GPTPartitionTable(DiskDevice& 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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if (!m_device->read_block(1, m_cached_header)) {
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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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kprintf("GPTPartitionTable::initialize: gpt_signature=%#x%x\n", header.sig[1], 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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kprintf("GPTPartitionTable::initialize: bad GPT signature %#x%x\n", header.sig[1], 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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kprintf("GPTPartitionTable::initialize: bad gpt signature - not initalized? %#x\n", 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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this->m_device->read_blocks(lba, 1, (u8*)&entries);
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GPTPartitionEntry& entry = entries[((index - 1) % entries_per_sector)];
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#ifdef GPT_DEBUG
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kprintf("GPTPartitionTable::partition %d\n", index);
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kprintf("GPTPartitionTable - offset = %d%d\n", 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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kprintf("GPTPartitionTable::partition: missing partition requested index=%d\n", 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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kprintf("GPTPartitionTable::partition: found partition index=%d type=%x-%x-%x-%x\n", index, entry.partition_guid[3], entry.partition_guid[2], entry.partition_guid[1], 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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