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93 lines
3.4 KiB
C++
93 lines
3.4 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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//
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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/Devices/BlockDevice.h>
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#include <Kernel/Interrupts/IRQHandler.h>
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#include <Kernel/Lock.h>
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namespace Kernel {
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class PATAChannel;
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class PATADiskDevice final : public BlockDevice {
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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(PATAChannel&, DriveType, int major, int minor);
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virtual ~PATADiskDevice() override;
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// ^DiskDevice
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virtual bool read_blocks(unsigned index, u16 count, UserOrKernelBuffer&) override;
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virtual bool write_blocks(unsigned index, u16 count, const UserOrKernelBuffer&) override;
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void set_drive_geometry(u16, u16, u16);
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// ^BlockDevice
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virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override;
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual KResultOr<size_t> write(FileDescription&, size_t, const UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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protected:
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explicit PATADiskDevice(PATAChannel&, DriveType, int, int);
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private:
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// ^DiskDevice
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virtual const char* class_name() const override;
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bool wait_for_irq();
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bool read_sectors_with_dma(u32 lba, u16 count, UserOrKernelBuffer&);
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bool write_sectors_with_dma(u32 lba, u16 count, const UserOrKernelBuffer&);
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bool read_sectors(u32 lba, u16 count, UserOrKernelBuffer& buffer);
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bool write_sectors(u32 lba, u16 count, const UserOrKernelBuffer& data);
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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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DriveType m_drive_type { DriveType::Master };
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PATAChannel& m_channel;
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};
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}
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