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531037db7e
An article about IDE limits states that: "Hard drives over 8.4 GB are supposed to report their geometry as 16383/16/63. This in effect means that the `geometry' is obsolete, and the total disk size can no longer be computed from the geometry, but is found in the LBA capacity field returned by the IDENTIFY command. Hard drives over 137.4 GB are supposed to report an LBA capacity of 0xfffffff = 268435455 sectors (137438952960 bytes). Now the actual disk size is found in the new 48-capacity field." (https://tldp.org/HOWTO/Large-Disk-HOWTO-4.html) which is the main reason to not support CHS as harddrives with less than 8.4 GB capacity are completely obsolete. Another good reason is that virtually any harddrive in the last 20 years or so, supports LBA mode. Therefore, it's probably OK to just ignore CHS as it's unlikely to encounter a harddrive that doesn't support LBA. This is somewhat simplifying the IDE initialization and access code. Also, we should use the ATAIdentifyBlock structure if possible, so now we do it instead of using macros to calculate offsets. With the usage of the ATAIdentifyBlock structure, we now use the 48-bit LBA max count if the drive indicates it supports 48-bit LBA mode.
85 lines
2.9 KiB
C++
85 lines
2.9 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 IDEChannel;
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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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enum class InterfaceType : u8 {
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ATA,
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ATAPI,
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};
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public:
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static NonnullRefPtr<PATADiskDevice> create(const IDEController&, IDEChannel&, DriveType, InterfaceType, u16, u64);
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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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// ^BlockDevice
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virtual void start_request(AsyncBlockDeviceRequest&) override;
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virtual String device_name() const override;
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private:
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PATADiskDevice(const IDEController&, IDEChannel&, DriveType, InterfaceType, u16, u64);
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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_capabilities { 0 };
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IDEChannel& m_channel;
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DriveType m_drive_type { DriveType::Master };
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InterfaceType m_interface_type { InterfaceType::ATA };
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};
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}
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