Cosmos/source/Cosmos.Core/IOGroup/ATA.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Cosmos.Core;
using Cosmos.Debug.Kernel;

namespace Cosmos.Core.IOGroup {
  public class ATA : IOGroup {
    public readonly IOPort Data;
    //* Error Register: BAR0 + 1; // Read Only
    //* Features Register: BAR0 + 1; // Write Only
    public readonly IOPortWrite SectorCount;
    // ATA_REG_SECCOUNT1  0x08 - HOB
    public readonly IOPort LBA0;
    public readonly IOPort LBA1;
    public readonly IOPort LBA2;
    // ATA_REG_LBA3       0x09 - HOB
    // ATA_REG_LBA4       0x0A - HOB
    // ATA_REG_LBA5       0x0B - HOB
    public readonly IOPortWrite DeviceSelect;
    public readonly IOPortWrite Command;
    public readonly IOPortRead Status;
    //* Alternate Status Register: BAR1 + 2; // Read Only.
    public readonly IOPortWrite Control;
    //* DEVADDRESS: BAR1 + 2; // I don't know what is the benefit from this register

    internal ATA(bool aSecondary)
    {
      if (aSecondary)
      {
        Global.mDebugger.Send("Creating Secondary ATA IOGroup");
      }
      else
      {
        Global.mDebugger.Send("Creating Primary ATA IOGroup");
      }

      var xBAR0 = GetBAR0(aSecondary);
      var xBAR1 = GetBAR1(aSecondary);
      Data = new IOPort(xBAR0);
      SectorCount = new IOPortWrite(xBAR0, 2);
      LBA0 = new IOPort(xBAR0, 3);
      LBA1 = new IOPort(xBAR0, 4);
      LBA2 = new IOPort(xBAR0, 5);
      Command = new IOPortWrite(xBAR0, 7);
      Status = new IOPortRead(xBAR0, 7);
      DeviceSelect = new IOPortWrite(xBAR0, 6);
      Control = new IOPortWrite(xBAR1, 2);
    }

    private static ushort GetBAR1(bool aSecondary)
    {
      UInt16 xBAR1 = (UInt16) (aSecondary ? 0x0374 : 0x03F4);
      return xBAR1;
    }

    private static ushort GetBAR0(bool aSecondary)
    {
      UInt16 xBAR0 = (UInt16) (aSecondary ? 0x0170 : 0x01F0);
      return xBAR0;
    }
  }
}