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Aaru.Decoders/SCSI/Modes/02.cs
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224
Aaru.Decoders/SCSI/Modes/02.cs
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// /***************************************************************************
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// Aaru Data Preservation Suite
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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 © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System.Diagnostics.CodeAnalysis;
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using System.Text;
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namespace Aaru.Decoders.SCSI;
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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[SuppressMessage("ReSharper", "MemberCanBeInternal")]
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[SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
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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>Disconnect-reconnect page Page code 0x02 16 bytes in SCSI-2, SPC-1, SPC-2, SPC-3, SPC-4, SPC-5</summary>
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public struct ModePage_02
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{
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/// <summary>Parameters can be saved</summary>
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public bool PS;
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/// <summary>How full should be the buffer prior to attempting a reselection</summary>
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public byte BufferFullRatio;
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/// <summary>How empty should be the buffer prior to attempting a reselection</summary>
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public byte BufferEmptyRatio;
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/// <summary>Max. time in 100 µs increments that the target is permitted to assert BSY without a REQ/ACK</summary>
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public ushort BusInactivityLimit;
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/// <summary>Min. time in 100 µs increments to wait after releasing the bus before attempting reselection</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
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/// restricted by <see cref="DTDC" />
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/// </summary>
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public ushort ConnectTimeLimit;
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/// <summary>Maximum amount of data before disconnecting in 512 bytes increments</summary>
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public ushort MaxBurstSize;
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/// <summary>Data transfer disconnect control</summary>
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public byte DTDC;
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/// <summary>Target shall not transfer data for a command during the same interconnect tenancy</summary>
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public bool DIMM;
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/// <summary>Wether to use fair or unfair arbitration when requesting an interconnect tenancy</summary>
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public byte FairArbitration;
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/// <summary>Max. ammount of data in 512 bytes increments that may be transferred for a command along with the command</summary>
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public ushort FirstBurstSize;
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/// <summary>Target is allowed to re-order the data transfer</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)
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return null;
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if((pageResponse?[0] & 0x3F) != 0x02)
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return null;
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if(pageResponse[1] + 2 != pageResponse.Length)
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return null;
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if(pageResponse.Length < 12)
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return null;
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var 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)
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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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PrettifyModePage_02(DecodeModePage_02(pageResponse));
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public static string PrettifyModePage_02(ModePage_02? modePage)
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{
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if(!modePage.HasValue)
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return null;
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ModePage_02 page = modePage.Value;
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var sb = new StringBuilder();
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sb.AppendLine(Localization.SCSI_Disconnect_Reconnect_mode_page);
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if(page.PS)
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sb.AppendLine("\t" + Localization.Parameters_can_be_saved);
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if(page.BufferFullRatio > 0)
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{
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sb.AppendFormat("\t" + Localization._0_ratio_of_buffer_that_shall_be_full_prior_to_attempting_a_reselection,
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page.BufferFullRatio).
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AppendLine();
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}
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if(page.BufferEmptyRatio > 0)
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{
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sb.
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AppendFormat("\t" + Localization._0_ratio_of_buffer_that_shall_be_empty_prior_to_attempting_a_reselection,
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page.BufferEmptyRatio).
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AppendLine();
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}
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if(page.BusInactivityLimit > 0)
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{
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sb.AppendFormat("\t" + Localization._0_µs_maximum_permitted_to_assert_BSY_without_a_REQ_ACK_handshake,
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page.BusInactivityLimit * 100).
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AppendLine();
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}
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if(page.DisconnectTimeLimit > 0)
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{
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sb.
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AppendFormat("\t" + Localization._0_µs_maximum_permitted_wait_after_releasing_the_bus_before_attempting_reselection,
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page.DisconnectTimeLimit * 100).
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AppendLine();
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}
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if(page.ConnectTimeLimit > 0)
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{
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sb.
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AppendFormat("\t" + Localization._0_µs_allowed_to_use_the_bus_before_disconnecting_if_granted_the_privilege_and_not_restricted,
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page.ConnectTimeLimit * 100).
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AppendLine();
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}
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if(page.MaxBurstSize > 0)
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{
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sb.AppendFormat("\t" + Localization._0_bytes_maximum_can_be_transferred_before_disconnecting,
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page.MaxBurstSize * 512).
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AppendLine();
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}
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if(page.FirstBurstSize > 0)
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{
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sb.
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AppendFormat("\t" + Localization._0_bytes_maximum_can_be_transferred_for_a_command_along_with_the_disconnect_command,
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page.FirstBurstSize * 512).
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AppendLine();
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}
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if(page.DIMM)
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{
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sb.AppendLine("\t" +
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Localization.
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Target_shall_not_transfer_data_for_a_command_during_the_same_interconnect_tenancy);
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}
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if(page.EMDP)
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sb.AppendLine("\t" + Localization.Target_is_allowed_to_reorder_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("\t" + Localization.Data_transfer_disconnect_control_is_not_used);
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break;
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case 1:
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sb.AppendLine("\t" +
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Localization.
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All_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("\t" +
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Localization.
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All_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("\t" + Localization.Reserved_data_transfer_disconnect_control_value_0, page.DTDC).
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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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