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1b2ef8582c
Asking a File if we could possibly read or write it will never mutate the asking FileDescription&, so it should be const.
65 lines
2.0 KiB
C++
65 lines
2.0 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 <Kernel/Devices/DiskDevice.h>
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#include <Kernel/IRQHandler.h>
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#include <Kernel/Lock.h>
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class PATAChannel;
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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, int major, int minor);
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virtual ~PATADiskDevice() override;
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// ^DiskDevice
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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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// ^BlockDevice
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virtual ssize_t read(FileDescription&, u8*, ssize_t) override { return 0; }
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virtual bool can_read(const FileDescription&) const override { return true; }
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virtual ssize_t write(FileDescription&, const u8*, ssize_t) override { return 0; }
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virtual bool can_write(const FileDescription&) const override { return true; }
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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, 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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