Luna/kernel/src/arch/x86_64/disk/ATA.h

#pragma once
#include "arch/PCI.h"
#include "fs/devices/DeviceRegistry.h"
#include <luna/Atomic.h>
#include <luna/SharedPtr.h>

namespace ATA
{
    class Controller;
    class Channel
    {
      public:
        Channel(Controller* controller, u8 channel_index, Badge<Controller>);

        bool initialize();

      private:
        Controller* m_controller;
        u8 m_channel_index;
        bool m_is_pci_native_mode;

        u32 m_base_address;
        u32 m_control_port_base_address;
    };

    class Controller
    {
      public:
        static Result<void> scan();

        const PCI::Device& device() const
        {
            return m_device;
        }

        bool initialize();

      private:
        Controller(const PCI::Device& device);
        PCI::Device m_device;
        Channel m_primary_channel;
        Channel m_secondary_channel;

        Atomic<int> m_hwlock = 0;
    };

}

class ATADevice : public Device
{
  public:
    // Initializer for DeviceRegistry.
    static Result<void> create(SharedPtr<ATA::Controller> controller, int channel, int drive);

    Result<usize> read(u8*, usize, usize) const override;

    Result<usize> write(const u8*, usize, usize) override;

    bool blocking() const override;

    Result<u64> ioctl(int request, void* arg) override;

    usize size() const override;

    virtual ~ATADevice() = default;

  private:
    ATADevice(SharedPtr<ATA::Controller> controller);
    SharedPtr<ATA::Controller> m_controller;
    int m_channel;
    int m_drive;
};