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194 lines
8.5 KiB
C#
194 lines
8.5 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : 02.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Device structures decoders.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Decodes SCSI MODE PAGE 02h: Disconnect-reconnect page.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System.Text;
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namespace DiscImageChef.Decoders.SCSI
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{
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public static partial class Modes
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{
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#region Mode Page 0x02: Disconnect-reconnect page
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/// <summary>
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/// Disconnect-reconnect page
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/// Page code 0x02
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/// 16 bytes in SCSI-2, SPC-1, SPC-2, SPC-3, SPC-4, SPC-5
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/// </summary>
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public struct ModePage_02
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{
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/// <summary>
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/// Parameters can be saved
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/// </summary>
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public bool PS;
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/// <summary>
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/// How full should be the buffer prior to attempting a reselection
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/// </summary>
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public byte BufferFullRatio;
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/// <summary>
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/// How empty should be the buffer prior to attempting a reselection
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/// </summary>
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public byte BufferEmptyRatio;
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/// <summary>
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/// Max. time in 100 µs increments that the target is permitted to assert BSY without a REQ/ACK
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/// </summary>
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public ushort BusInactivityLimit;
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/// <summary>
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/// Min. time in 100 µs increments to wait after releasing the bus before attempting reselection
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/// </summary>
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public ushort DisconnectTimeLimit;
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/// <summary>
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/// Max. time in 100 µs increments allowed to use the bus before disconnecting, if granted the privilege and not restricted by <see cref="DTDC"/>
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/// </summary>
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public ushort ConnectTimeLimit;
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/// <summary>
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/// Maximum amount of data before disconnecting in 512 bytes increments
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/// </summary>
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public ushort MaxBurstSize;
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/// <summary>
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/// Data transfer disconnect control
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/// </summary>
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public byte DTDC;
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/// <summary>
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/// Target shall not transfer data for a command during the same interconnect tenancy
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/// </summary>
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public bool DIMM;
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/// <summary>
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/// Wether to use fair or unfair arbitration when requesting an interconnect tenancy
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/// </summary>
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public byte FairArbitration;
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/// <summary>
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/// Max. ammount of data in 512 bytes increments that may be transferred for a command along with the command
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/// </summary>
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public ushort FirstBurstSize;
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/// <summary>
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/// Target is allowed to re-order the data transfer
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/// </summary>
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public bool EMDP;
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}
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public static ModePage_02? DecodeModePage_02(byte[] pageResponse)
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{
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if((pageResponse?[0] & 0x40) == 0x40) return null;
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if((pageResponse?[0] & 0x3F) != 0x02) return null;
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if(pageResponse[1] + 2 != pageResponse.Length) return null;
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if(pageResponse.Length < 12) return null;
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ModePage_02 decoded = new ModePage_02();
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decoded.PS |= (pageResponse[0] & 0x80) == 0x80;
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decoded.BufferFullRatio = pageResponse[2];
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decoded.BufferEmptyRatio = pageResponse[3];
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decoded.BusInactivityLimit = (ushort)((pageResponse[4] << 8) + pageResponse[5]);
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decoded.DisconnectTimeLimit = (ushort)((pageResponse[6] << 8) + pageResponse[7]);
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decoded.ConnectTimeLimit = (ushort)((pageResponse[8] << 8) + pageResponse[9]);
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decoded.MaxBurstSize = (ushort)((pageResponse[10] << 8) + pageResponse[11]);
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if(pageResponse.Length >= 13)
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{
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decoded.EMDP |= (pageResponse[12] & 0x80) == 0x80;
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decoded.DIMM |= (pageResponse[12] & 0x08) == 0x08;
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decoded.FairArbitration = (byte)((pageResponse[12] & 0x70) >> 4);
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decoded.DTDC = (byte)(pageResponse[12] & 0x07);
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}
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if(pageResponse.Length >= 16) decoded.FirstBurstSize = (ushort)((pageResponse[14] << 8) + pageResponse[15]);
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return decoded;
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}
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public static string PrettifyModePage_02(byte[] pageResponse)
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{
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return PrettifyModePage_02(DecodeModePage_02(pageResponse));
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}
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public static string PrettifyModePage_02(ModePage_02? modePage)
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{
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if(!modePage.HasValue) return null;
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ModePage_02 page = modePage.Value;
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StringBuilder sb = new StringBuilder();
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sb.AppendLine("SCSI Disconnect-Reconnect mode page:");
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if(page.PS) sb.AppendLine("\tParameters can be saved");
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if(page.BufferFullRatio > 0)
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sb.AppendFormat("\t{0} ratio of buffer that shall be full prior to attempting a reselection",
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page.BufferFullRatio).AppendLine();
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if(page.BufferEmptyRatio > 0)
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sb.AppendFormat("\t{0} ratio of buffer that shall be empty prior to attempting a reselection",
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page.BufferEmptyRatio).AppendLine();
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if(page.BusInactivityLimit > 0)
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sb.AppendFormat("\t{0} µs maximum permitted to assert BSY without a REQ/ACK handshake",
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page.BusInactivityLimit * 100).AppendLine();
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if(page.DisconnectTimeLimit > 0)
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sb.AppendFormat("\t{0} µs maximum permitted wait after releasing the bus before attempting reselection",
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page.DisconnectTimeLimit * 100).AppendLine();
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if(page.ConnectTimeLimit > 0)
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sb
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.AppendFormat("\t{0} µs allowed to use the bus before disconnecting, if granted the privilege and not restricted",
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page.ConnectTimeLimit * 100).AppendLine();
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if(page.MaxBurstSize > 0)
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sb.AppendFormat("\t{0} bytes maximum can be transferred before disconnecting", page.MaxBurstSize * 512)
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.AppendLine();
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if(page.FirstBurstSize > 0)
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sb
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.AppendFormat("\t{0} bytes maximum can be transferred for a command along with the disconnect command",
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page.FirstBurstSize * 512).AppendLine();
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if(page.DIMM)
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sb.AppendLine("\tTarget shall not transfer data for a command during the same interconnect tenancy");
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if(page.EMDP) sb.AppendLine("\tTarget is allowed to re-order the data transfer");
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switch(page.DTDC)
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{
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case 0:
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sb.AppendLine("\tData transfer disconnect control is not used");
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break;
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case 1:
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sb.AppendLine("\tAll data for a command shall be transferred within a single interconnect tenancy");
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break;
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case 3:
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sb.AppendLine("\tAll data and the response for a command shall be transferred within a single interconnect tenancy");
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break;
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default:
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sb.AppendFormat("\tReserved data transfer disconnect control value {0}", page.DTDC).AppendLine();
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break;
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}
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return sb.ToString();
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}
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#endregion Mode Page 0x02: Disconnect-reconnect page
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}
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} |