public static ModePage_08?DecodeModePage_08(byte[] pageResponse) { if ((pageResponse?[0] &0x40) == 0x40) { return(null); } if ((pageResponse?[0] &0x3F) != 0x08) { return(null); } if (pageResponse[1] + 2 != pageResponse.Length) { return(null); } if (pageResponse.Length < 12) { return(null); } ModePage_08 decoded = new ModePage_08(); decoded.PS |= (pageResponse[0] & 0x80) == 0x80; decoded.WCE |= (pageResponse[2] & 0x04) == 0x04; decoded.MF |= (pageResponse[2] & 0x02) == 0x02; decoded.RCD |= (pageResponse[2] & 0x01) == 0x01; decoded.DemandReadRetentionPrio = (byte)((pageResponse[3] & 0xF0) >> 4); decoded.WriteRetentionPriority = (byte)(pageResponse[3] & 0x0F); decoded.DisablePreFetch = (ushort)((pageResponse[4] << 8) + pageResponse[5]); decoded.MinimumPreFetch = (ushort)((pageResponse[6] << 8) + pageResponse[7]); decoded.MaximumPreFetch = (ushort)((pageResponse[8] << 8) + pageResponse[9]); decoded.MaximumPreFetchCeiling = (ushort)((pageResponse[10] << 8) + pageResponse[11]); if (pageResponse.Length < 20) { return(decoded); } decoded.IC |= (pageResponse[2] & 0x80) == 0x80; decoded.ABPF |= (pageResponse[2] & 0x40) == 0x40; decoded.CAP |= (pageResponse[2] & 0x20) == 0x20; decoded.Disc |= (pageResponse[2] & 0x10) == 0x10; decoded.Size |= (pageResponse[2] & 0x08) == 0x08; decoded.FSW |= (pageResponse[12] & 0x80) == 0x80; decoded.LBCSS |= (pageResponse[12] & 0x40) == 0x40; decoded.DRA |= (pageResponse[12] & 0x20) == 0x20; decoded.CacheSegments = pageResponse[13]; decoded.CacheSegmentSize = (ushort)((pageResponse[14] << 8) + pageResponse[15]); decoded.NonCacheSegmentSize = (uint)((pageResponse[17] << 16) + (pageResponse[18] << 8) + pageResponse[19]); decoded.NV_DIS |= (pageResponse[12] & 0x01) == 0x01; return(decoded); }
public static string PrettifyModePage_08(ModePage_08?modePage) { if (!modePage.HasValue) { return(null); } ModePage_08 page = modePage.Value; StringBuilder sb = new StringBuilder(); sb.AppendLine("SCSI Caching mode page:"); if (page.PS) { sb.AppendLine("\tParameters can be saved"); } if (page.RCD) { sb.AppendLine("\tRead-cache is enabled"); } if (page.WCE) { sb.AppendLine("\tWrite-cache is enabled"); } switch (page.DemandReadRetentionPrio) { case 0: sb.AppendLine("\tDrive does not distinguish between cached read data"); break; case 1: sb.AppendLine("\tData put by READ commands should be evicted from cache sooner than data put in read cache by other means"); break; case 0xF: sb.AppendLine("\tData put by READ commands should not be evicted if there is data cached by other means that can be evicted"); break; default: sb.AppendFormat("\tUnknown demand read retention priority value {0}", page.DemandReadRetentionPrio) .AppendLine(); break; } switch (page.WriteRetentionPriority) { case 0: sb.AppendLine("\tDrive does not distinguish between cached write data"); break; case 1: sb.AppendLine("\tData put by WRITE commands should be evicted from cache sooner than data put in write cache by other means"); break; case 0xF: sb.AppendLine("\tData put by WRITE commands should not be evicted if there is data cached by other means that can be evicted"); break; default: sb.AppendFormat("\tUnknown demand write retention priority value {0}", page.DemandReadRetentionPrio) .AppendLine(); break; } if (page.DRA) { sb.AppendLine("\tRead-ahead is disabled"); } else { if (page.MF) { sb.AppendLine("\tPre-fetch values indicate a block multiplier"); } if (page.DisablePreFetch == 0) { sb.AppendLine("\tNo pre-fetch will be done"); } else { sb.AppendFormat("\tPre-fetch will be done for READ commands of {0} blocks or less", page.DisablePreFetch).AppendLine(); if (page.MinimumPreFetch > 0) { sb.AppendFormat("At least {0} blocks will be always pre-fetched", page.MinimumPreFetch) .AppendLine(); } if (page.MaximumPreFetch > 0) { sb.AppendFormat("\tA maximum of {0} blocks will be pre-fetched", page.MaximumPreFetch) .AppendLine(); } if (page.MaximumPreFetchCeiling > 0) { sb .AppendFormat("\tA maximum of {0} blocks will be pre-fetched even if it is commanded to pre-fetch more", page.MaximumPreFetchCeiling).AppendLine(); } if (page.IC) { sb.AppendLine("\tDevice should use number of cache segments or cache segment size for caching"); } if (page.ABPF) { sb.AppendLine("\tPre-fetch should be aborted upong receiving a new command"); } if (page.CAP) { sb.AppendLine("\tCaching analysis is permitted"); } if (page.Disc) { sb.AppendLine("\tPre-fetch can continue across discontinuities (such as cylinders or tracks)"); } } } if (page.FSW) { sb.AppendLine("\tDrive should not reorder the sequence of write commands to be faster"); } if (page.Size) { if (page.CacheSegmentSize > 0) { if (page.LBCSS) { sb.AppendFormat("\tDrive cache segments should be {0} blocks long", page.CacheSegmentSize) .AppendLine(); } else { sb.AppendFormat("\tDrive cache segments should be {0} bytes long", page.CacheSegmentSize) .AppendLine(); } } } else { if (page.CacheSegments > 0) { sb.AppendFormat("\tDrive should have {0} cache segments", page.CacheSegments).AppendLine(); } } if (page.NonCacheSegmentSize > 0) { sb .AppendFormat("\tDrive shall allocate {0} bytes to buffer even when all cached data cannot be evicted", page.NonCacheSegmentSize).AppendLine(); } if (page.NV_DIS) { sb.AppendLine("\tNon-Volatile cache is disabled"); } return(sb.ToString()); }