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0a2b00a1bf
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.
81 lines
2.8 KiB
C++
81 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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//
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// A Disk Device Connected to a PATA Channel
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//
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#pragma once
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#include <Kernel/Interrupts/IRQHandler.h>
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#include <Kernel/Lock.h>
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#include <Kernel/Storage/StorageDevice.h>
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namespace Kernel {
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class IDEController;
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class PATADiskDevice final : public StorageDevice {
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friend class IDEController;
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AK_MAKE_ETERNAL
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public:
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// Type of drive this IDEDiskDevice is on the ATA channel.
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//
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// Each PATA channel can contain only two devices, which (I think) are
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// jumper selectable on the drive itself by shorting two pins.
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enum class DriveType : u8 {
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Master,
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Slave
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};
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public:
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static NonnullRefPtr<PATADiskDevice> create(const IDEController&, IDEChannel&, DriveType, u8, u8, u8, int major, int minor);
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virtual ~PATADiskDevice() override;
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// ^StorageDevice
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virtual Type type() const override { return StorageDevice::Type::IDE; }
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virtual size_t max_addressable_block() const override;
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// ^BlockDevice
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virtual void start_request(AsyncBlockDeviceRequest&) override;
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private:
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PATADiskDevice(const IDEController&, IDEChannel&, DriveType, u8, u8, u8, int major, int minor);
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// ^DiskDevice
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virtual const char* class_name() const override;
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bool is_slave() const;
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Lock m_lock { "IDEDiskDevice" };
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u16 m_cylinders { 0 };
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u16 m_heads { 0 };
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u16 m_sectors_per_track { 0 };
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IDEChannel& m_channel;
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DriveType m_drive_type { DriveType::Master };
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};
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}
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