mirror of
https://github.com/RGBCube/serenity
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59e122f8ba
The previous implementation of the PIIX3/4 PATA/IDE channel driver only supported a single drive, as the object model was wrong (the channel inherits the IRQ, not the disk drive itself). This fixes it by 'attaching' two `PATADiskDevices` to a `PATAChannel`, which makes more sense. The reading/writing code is presented as is, which violates the spec outlined by Seagate in the linked datasheet. That spec is rather old, so it might not be 100% up to date, though may cause issues on real hardware, so until we can actually test it, this will suffice.
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
//
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// A Disk Device Connected to a PATA Channel
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//
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//
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#pragma once
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#include <AK/RefPtr.h>
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#include <Kernel/Devices/DiskDevice.h>
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#include <Kernel/Devices/PATAChannel.h>
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#include <Kernel/IRQHandler.h>
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#include <Kernel/Lock.h>
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#include <Kernel/PCI.h>
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#include <Kernel/VM/PhysicalAddress.h>
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#include <Kernel/VM/PhysicalPage.h>
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class PATADiskDevice final : public DiskDevice {
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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);
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virtual ~PATADiskDevice() override;
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// ^DiskDevice
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virtual unsigned block_size() const override;
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virtual bool read_block(unsigned index, u8*) const override;
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virtual bool write_block(unsigned index, const u8*) override;
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virtual bool read_blocks(unsigned index, u16 count, u8*) override;
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virtual bool write_blocks(unsigned index, u16 count, const u8*) override;
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void set_drive_geometry(u16, u16, u16);
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protected:
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explicit PATADiskDevice(PATAChannel&, DriveType);
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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, u8*);
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bool write_sectors_with_dma(u32 lba, u16 count, const u8*);
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bool read_sectors(u32 lba, u16 count, u8* buffer);
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bool write_sectors(u32 lba, u16 count, const u8* 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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