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This new subsystem is somewhat replacing the IDE disk code we had with a new flexible design. StorageDevice is a generic class that represent a generic storage device. It is meant that specific storage hardware will override the interface. StorageController is a generic class that represent a storage controller that can be found in a machine. The IDEController class governs two IDEChannels. An IDEChannel is responsible to manage the master & slave devices of the channel, therefore an IDEChannel is an IRQHandler.
78 lines
2.8 KiB
C++
78 lines
2.8 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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//#define PATA_DEVICE_DEBUG
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#include <AK/Memory.h>
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#include <AK/StringView.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Storage/IDEChannel.h>
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#include <Kernel/Storage/IDEController.h>
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#include <Kernel/Storage/PATADiskDevice.h>
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namespace Kernel {
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NonnullRefPtr<PATADiskDevice> PATADiskDevice::create(const IDEController& controller, IDEChannel& channel, DriveType type, u8 cylinders, u8 heads, u8 spt, int major, int minor)
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{
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return adopt(*new PATADiskDevice(controller, channel, type, cylinders, heads, spt, major, minor));
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}
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PATADiskDevice::PATADiskDevice(const IDEController& controller, IDEChannel& channel, DriveType type, u8 cylinders, u8 heads, u8 spt, int major, int minor)
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: StorageDevice(controller, major, minor, 512, 0)
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, m_cylinders(cylinders)
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, m_heads(heads)
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, m_sectors_per_track(spt)
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, m_channel(channel)
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, m_drive_type(type)
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{
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}
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PATADiskDevice::~PATADiskDevice()
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{
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}
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const char* PATADiskDevice::class_name() const
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{
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return "PATADiskDevice";
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}
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void PATADiskDevice::start_request(AsyncBlockDeviceRequest& request)
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{
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bool use_dma = !m_channel.m_io_group.bus_master_base().is_null() && m_channel.m_dma_enabled.resource();
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m_channel.start_request(request, use_dma, is_slave());
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}
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size_t PATADiskDevice::max_addressable_block() const
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{
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return m_cylinders * m_heads * m_sectors_per_track;
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}
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bool PATADiskDevice::is_slave() const
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{
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return m_drive_type == DriveType::Slave;
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}
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}
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