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Kernel: Introduce the new Storage subsystem

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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.
This commit is contained in:
Liav A 2020-12-19 12:50:57 +02:00 • committed by Andreas Kling
parent 39c1783387
commit 0a2b00a1bf
12 changed files with 604 additions and 213 deletions
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81
Kernel/Storage/PATADiskDevice.h Normal file
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
//
// A Disk Device Connected to a PATA Channel
//
#pragma once
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/Lock.h>
#include <Kernel/Storage/StorageDevice.h>
namespace Kernel {
class IDEController;
class PATADiskDevice final : public StorageDevice {
friend class IDEController;
AK_MAKE_ETERNAL
public:
// Type of drive this IDEDiskDevice is on the ATA channel.
//
// Each PATA channel can contain only two devices, which (I think) are
// jumper selectable on the drive itself by shorting two pins.
enum class DriveType : u8 {
Master,
Slave
};
public:
static NonnullRefPtr<PATADiskDevice> create(const IDEController&, IDEChannel&, DriveType, u8, u8, u8, int major, int minor);
virtual ~PATADiskDevice() override;
// ^StorageDevice
virtual Type type() const override { return StorageDevice::Type::IDE; }
virtual size_t max_addressable_block() const override;
// ^BlockDevice
virtual void start_request(AsyncBlockDeviceRequest&) override;
private:
PATADiskDevice(const IDEController&, IDEChannel&, DriveType, u8, u8, u8, int major, int minor);
// ^DiskDevice
virtual const char* class_name() const override;
bool is_slave() const;
Lock m_lock { "IDEDiskDevice" };
u16 m_cylinders { 0 };
u16 m_heads { 0 };
u16 m_sectors_per_track { 0 };
IDEChannel& m_channel;
DriveType m_drive_type { DriveType::Master };
};
}