mirror of
https://github.com/RGBCube/serenity
synced 2025-05-18 15:15:08 +00:00
2fd5ce1eb0
This allows issuing asynchronous requests for devices and waiting on the completion of the request. The requests can cascade into multiple sub-requests. Since IRQs may complete at any time, if the current process is no longer the same that started the process, we need to swich the paging context before accessing user buffers. Change the PATA driver to use this model.
109 lines
4 KiB
C++
109 lines
4 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_block(lba, 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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