490 lines
17 KiB
C
490 lines
17 KiB
C
/* $NetBSD: mscp.h,v 1.8 2005/12/11 12:22:47 christos Exp $ */
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/*
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* Copyright (c) 1988 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)mscp.h 7.5 (Berkeley) 6/28/90
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*/
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/*
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* Definitions for the Mass Storage Control Protocol
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* I WISH I KNEW WHAT MORE OF THESE WERE. IT SURE WOULD BE NICE
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* IF DEC SOLD DOCUMENTATION FOR THEIR OWN CONTROLLERS.
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*/
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/*
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* Control message opcodes
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*/
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#define M_OP_ABORT 0x01 /* Abort command */
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#define M_OP_GETCMDST 0x02 /* Get command status command */
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#define M_OP_GETUNITST 0x03 /* Get unit status command */
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#define M_OP_SETCTLRC 0x04 /* Set controller characteristics command */
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#define M_OP_SEREX 0x07 /* Serious exception end message */
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#define M_OP_AVAILABLE 0x08 /* Available command */
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#define M_OP_ONLINE 0x09 /* Online command */
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#define M_OP_SETUNITC 0x0a /* Set unit characteristics command */
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#define M_OP_DTACCPATH 0x0b /* Determine access paths command */
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#define M_OP_ACCESS 0x10 /* Access command */
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#define M_OP_COMPCD 0x11 /* Compare controller data command */
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#define M_OP_ERASE 0x12 /* Erase command */
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#define M_OP_FLUSH 0x13 /* Flush command */
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#define M_OP_REPLACE 0x14 /* Replace command */
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#define M_OP_COMPHD 0x20 /* Compare host data command */
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#define M_OP_READ 0x21 /* Read command */
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#define M_OP_WRITE 0x22 /* Write command */
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#define M_OP_WRITM 0x24 /* Write mark command */
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#define M_OP_POS 0x25 /* Positioning command */
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#define M_OP_AVAILATTN 0x40 /* Available attention message */
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#define M_OP_DUPUNIT 0x41 /* Duplicate unit number attention message */
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#define M_OP_ACCPATH 0x42 /* Access path attention message */
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#define M_OP_END 0x80 /* End message flag */
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/*
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* Generic command modifiers
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*/
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#define M_MD_EXPRS 0x8000 /* Express request */
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#define M_MD_COMP 0x4000 /* Compare */
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#define M_MD_CLSEX 0x2000 /* Clear serious exception */
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#define M_MD_ERROR 0x1000 /* Force error */
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#define M_MD_SCCHH 0x0800 /* Suppress caching (high speed) */
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#define M_MD_SCCHL 0x0400 /* Suppress caching (low speed) */
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#define M_MD_SECOR 0x0200 /* Suppress error correction */
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#define M_MD_SEREC 0x0100 /* Suppress error recovery */
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#define M_MD_SSHDW 0x0080 /* Suppress shadowing */
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#define M_MD_WBKNV 0x0040 /* Write back (non-volatile) */
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#define M_MD_WBKVL 0x0020 /* Write back (volatile) */
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#define M_MD_WRSEQ 0x0010 /* Write shadow set one unit at a time */
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/*
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* tape command modifiers
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*/
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#define M_MD_IMMEDIATE 0x0040 /* Immediate completion */
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#define M_MD_UNLOAD 0x0010 /* Unload tape */
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#define M_MD_REVERSE 0x0008 /* Reverse action */
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#define M_MD_OBJCOUNT 0x0004 /* Object count */
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#define M_MD_REWIND 0x0002 /* Rewind */
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/*
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* AVAILABLE command modifiers
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*/
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#define M_AVM_ALLCD 0x0002 /* All class drivers */
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#define M_AVM_SPINDOWN 0x0001 /* Spin down */
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/*
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* FLUSH command modifiers
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*/
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#define M_FLM_FLUSHENU 0x0001 /* Flush entire unit */
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#define M_FLM_VOLATILE 0x0002 /* Volatile only */
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/*
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* GET UNIT STATUS command modifiers
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*/
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#define M_GUM_NEXTUNIT 0x0001 /* Next unit */
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/*
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* ONLINE command modifiers
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*/
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#define M_OLM_RIP 0x0001 /* Allow self destruction */
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#define M_OLM_IGNMF 0x0002 /* Ignore media format error */
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/*
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* ONLINE and SET UNIT CHARACTERISTICS command modifiers
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*/
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#define M_OSM_ALTERHI 0x0020 /* Alter host identifier */
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#define M_OSM_SHADOWSP 0x0010 /* Shadow unit specified */
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#define M_OSM_CLEARWBL 0x0008 /* Clear write-back data lost */
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#define M_OSM_SETWRPROT 0x0004 /* Set write protect */
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/*
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* REPLACE command modifiers
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*/
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#define M_RPM_PRIMARY 0x0001 /* Primary replacement block */
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/*
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* End message flags
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*/
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#define M_EF_BBLKR 0x80 /* Bad block reported */
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#define M_EF_BBLKU 0x40 /* Bad block unreported */
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#define M_EF_ERLOG 0x20 /* Error log generated */
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#define M_EF_SEREX 0x10 /* Serious exception */
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#define M_EF_EOT 0x08 /* at end-of-tape */
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#define M_EF_POSLOST 0x04 /* position lost */
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/*
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* Controller flags
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*/
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#define M_CF_ATTN 0x80 /* Enable attention messages */
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#define M_CF_MISC 0x40 /* Enable miscellaneous error log messages */
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#define M_CF_OTHER 0x20 /* Enable other host's error log messages */
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#define M_CF_THIS 0x10 /* Enable this host's error log messages */
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#define M_CF_MLTHS 0x04 /* Multi-host */
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#define M_CF_SHADW 0x02 /* Shadowing */
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#define M_CF_576 0x01 /* 576 byte sectors */
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/*
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* Unit flags
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*/
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#define M_UF_REPLC 0x8000 /* Controller initiated bad block replacement */
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#define M_UF_INACT 0x4000 /* Inactive shadow set unit */
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#define M_UF_WRTPH 0x2000 /* Write protect (hardware) */
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#define M_UF_WRTPS 0x1000 /* Write protect (software or volume) */
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#define M_UF_SCCHH 0x8000 /* Suppress caching (high speed) */
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#define M_UF_SCCHL 0x4000 /* Suppress caching (low speed) */
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#define M_UF_RMVBL 0x0080 /* Removable media */
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#define M_UF_WBKNV 0x0040 /* Write back (non-volatile) */
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#define M_UF_576 0x0004 /* 576 byte sectors */
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#define M_UF_CMPWR 0x0002 /* Compare writes */
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#define M_UF_CMPRD 0x0001 /* Compare reads */
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/*
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* Error Log message format codes
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*/
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#define M_FM_CTLRERR 0x00 /* Controller error */
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#define M_FM_BUSADDR 0x01 /* Host memory access error */
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#define M_FM_DISKTRN 0x02 /* Disk transfer error */
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#define M_FM_SDI 0x03 /* SDI error */
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#define M_FM_SMLDSK 0x04 /* Small disk error */
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#define M_FM_TAPETRN 0x05 /* Tape transfer error */
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#define M_FM_STIERR 0x06 /* STI communication or command failure */
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#define M_FM_STIDEL 0x07 /* STI drive error log */
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#define M_FM_STIFEL 0x08 /* STI formatter error log */
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/*
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* Error Log message flags
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*/
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#define M_LF_SUCC 0x80 /* Operation successful */
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#define M_LF_CONT 0x40 /* Operation continuing */
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#define M_LF_SQNRS 0x01 /* Sequence number reset */
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/*
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* Status codes
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*/
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#define M_ST_MASK 0x1f /* Status code mask */
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#define M_ST_SUCCESS 0x00 /* Success */
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#define M_ST_INVALCMD 0x01 /* Invalid command */
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#define M_ST_ABORTED 0x02 /* Command aborted */
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#define M_ST_OFFLINE 0x03 /* Unit offline */
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#define M_ST_AVAILABLE 0x04 /* Unit available */
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#define M_ST_MFMTERR 0x05 /* Media format error */
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#define M_ST_WRPROT 0x06 /* Write protected */
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#define M_ST_COMPERR 0x07 /* Compare error */
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#define M_ST_DATAERR 0x08 /* Data error */
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#define M_ST_HOSTBUFERR 0x09 /* Host buffer access error */
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#define M_ST_CTLRERR 0x0a /* Controller error */
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#define M_ST_DRIVEERR 0x0b /* Drive error */
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#define M_ST_FORMATTERR 0x0c /* Formatter error */
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#define M_ST_BOT 0x0d /* Beginning-of-tape */
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#define M_ST_TAPEMARK 0x0e /* Tape mark encountered */
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#define M_ST_RDTRUNC 0x10 /* Record data truncated */
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#define M_ST_DIAG 0x1f /* Message from an internal diagnostic */
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/*
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* Subcodes of M_ST_OFFLINE
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*/
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#define M_OFFLINE_UNKNOWN (0 << 5) /* unknown or on other ctlr */
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#define M_OFFLINE_UNMOUNTED (1 << 5) /* unmounted or RUN/STOP at STOP */
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#define M_OFFLINE_INOPERATIVE (2 << 5) /* inoperative? */
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#define M_OFFLINE_DUPLICATE (4 << 5) /* duplicate unit number */
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#define M_OFFLINE_INDIAGNOSTIC (8 << 5) /* disabled by FS or diagnostic */
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/*
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* An MSCP packet begins with a header giving the length of
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* the entire packet (including the header itself)(?), two bytes
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* of device specific data, and the a whole bunch of variants
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* depending on message type.
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*
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* N.B.: In most cases we distinguish between a `command' and
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* an `end' variant as well. The command variant is that which
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* is given to the controller; the `end' variant is its response.
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*/
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/*
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* Generic sequential message variant (command and response).
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*/
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struct mscpv_seq {
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long seq_bytecount; /* byte count */
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#define seq_rbn seq_bytecount /* aka RBN (replace) */
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#define seq_outref seq_bytecount /* aka outref (abort/get cmd status) */
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long seq_buffer; /* buffer descriptor */
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long seq_mapbase; /* page map (first PTE) phys address */
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long seq_xxx1; /* ? */ /* unused */
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long seq_lbn; /* logical block number */
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long seq_xxx2; /* ? */ /* unused */
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long *seq_addr; /* pointer to cmd descriptor */
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long seq_software[4]; /* reserved to software; unused */
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};
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/*
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* Set Controller Characteristics command variant
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*/
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struct mscpv_sccc {
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u_short sccc_version; /* MSCP version number */
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u_short sccc_ctlrflags; /* controller flags */
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u_short sccc_hosttimo; /* host timeout */
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u_short sccc_usefrac; /* use fraction */
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long sccc_time; /* time and date */
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long sccc_time1; /* it's a quad field */
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long sccc_errlgfl; /* ? */
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short sccc_xxx2; /* ? */
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short sccc_copyspd; /* ? */
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};
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/*
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* Set Controller Characteristics end variant
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*/
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struct mscpv_scce {
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u_short scce_version; /* MSCP version number */
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u_short scce_ctlrflags; /* controller flags */
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u_short scce_ctlrtimo; /* controller timeout */
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u_short scce_ctlrcmdl; /* ??? */
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quad_t scce_ctlrid; /* controller ID */
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long scce_xxx[3]; /* ? */
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long scce_volser; /* volume serial number */
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};
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/*
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* On Line command variant
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*/
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struct mscpv_onlc {
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long onlc_xxx1[4]; /* ? */
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long onlc_errlgfl; /* error log flag? */
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short onlc_xxx2; /* ? */
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short onlc_copyspd; /* copy speed? */
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};
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/*
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* On Line end variant
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*/
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struct mscpv_onle {
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long onle_xxx1[3]; /* ? */
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/*???*/ short onle_xxx2; /* ? */
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u_char onle_drivetype; /* drive type index (same in guse) */
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char onle_xxx3; /* ? */
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long onle_mediaid; /* media type id (same in guse) */
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long onle_xxx4; /* ? */
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long onle_unitsize; /* unit size in sectors */
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long onle_volser; /* volume serial number */
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};
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/*
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* Get Unit Status end variant (and Avail Attn?)
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*/
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struct mscpv_guse {
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u_short guse_multunit; /* multi-unit code */
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u_short guse_unitflags; /* unit flags */
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long guse_hostid; /* host id */
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long guse_unitid0; /*???*/
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short guse_unitid1; /*???*/
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u_char guse_drivetype; /* drive type index */
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u_char guse_unitid2; /*???*/
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long guse_mediaid; /* media type id (encoded) */
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short guse_shadowunit; /* shadow unit */
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short guse_shadowstat; /* shadow status */
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u_short guse_nspt; /* sectors per track */
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u_short guse_group; /* track group size */
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u_short guse_ngpc; /* groups per cylinder */
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u_short guse_xxx; /* reserved */
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u_short guse_rctsize; /* RCT size (sectors) */
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u_char guse_nrpt; /* RBNs per track */
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u_char guse_nrct; /* number of RCTs */
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};
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/*
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* Macros to break up and build media IDs. An ID encodes the port
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* type in the top 10 bits, and the drive type in the remaining 22.
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* The 10 bits, and 15 of the 22, are in groups of 5, with the value
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* 0 representing space and values 1..26 representing A..Z. The low
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* 7 bits represent a number in 0..127. Hence an RA81 on a UDA50
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* is <D><U><R><A>< >81, or 0x25641051. This encoding scheme is known
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* in part in uda.c.
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*
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* The casts below are just to make pcc generate better code.
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*/
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#define MSCP_MEDIA_PORT(id) (((long)(id) >> 22) & 0x3ff) /* port */
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#define MSCP_MEDIA_DRIVE(id) ((long)(id) & 0x003fffff) /* drive */
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#define MSCP_MID_ECH(n, id) (((int)(id) >> ((n) * 5 + 7)) & 0x1f)
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#define MSCP_MID_CHAR(n, id) \
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(MSCP_MID_ECH(n, id) ? MSCP_MID_ECH(n, id) + '@' : ' ')
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#define MSCP_MID_NUM(id) ((id) & 0x7f)
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/* for, e.g., RA81 */
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#define MSCP_MKDRIVE2(a, b, n) \
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(((a) - '@') << 17 | ((b) - '@') << 12 | (n))
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/* for, e.g., RRD50 */
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#define MSCP_MKDRIVE3(a, b, c, n) \
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(((a) - '@') << 17 | ((b) - '@') << 12 | ((c) - '@') << 7 | (n))
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/*
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* Error datagram variant.
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*/
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struct mscpv_erd {
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quad_t erd_ctlrid; /* controller ID */
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u_char erd_ctlrsoftware; /* controller software version */
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u_char erd_ctlrhardware; /* controller hardware version */
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u_short erd_multiunit; /* multi-unit code (?) */
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union {
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u_long un_busaddr; /* bus address, if mem access err */
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quad_t un_unitid; /* unit id, otherwise */
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} erd_un1;
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#define erd_busaddr erd_un1.un_busaddr
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#define erd_unitid erd_un1.un_unitid
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u_char erd_unitsoftware; /* unit software version */
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u_char erd_unithardware; /* unit hardware version */
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union {
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u_char un_b[2]; /* level, retry (if disk xfer err) */
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u_short un_s; /* cylinder (if small disk error) */
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} erd_un2;
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#define erd_level erd_un2.un_b[0]
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#define erd_retry erd_un2.un_b[1]
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#define erd_sdecyl erd_un2.un_s
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long erd_volser; /* volume serial number */
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u_long erd_hdr; /* `header' (block number) */
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u_char erd_sdistat[12]; /* SDI status information (?) */
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};
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/*
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* I am making brash assumptions about the first four bytes of all
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* MSCP packets. These appear to be true for both UDA50s and TMSCP
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* devices (TU81, TA81, TK50). DEC claim that these four bytes are
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* not part of MSCP itself, yet at least the length is necessary
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* for, e.g., error checking.
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*/
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struct mscp {
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u_short mscp_msglen; /* length in bytes */
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u_char mscp_msgtc; /* type (high 4 bits) and credits */
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u_char mscp_vcid; /* virtual circuit ID */
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long mscp_cmdref; /* command reference number */
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u_short mscp_unit; /* unit number */
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u_short mscp_seqnum; /* sequence number */
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u_char mscp_opcode; /* opcode */
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#define mscp_format mscp_opcode /* aka format (datagrams) */
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u_char mscp_flags; /* flags */
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u_short mscp_modifier; /* modifier (commands) */
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#define mscp_status mscp_modifier /* aka status (ends) */
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#define mscp_event mscp_modifier /* aka event (datagrams) */
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union {
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struct mscpv_seq un_seq; /* generic sequential msg */
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struct mscpv_sccc un_sccc; /* SCC command */
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struct mscpv_scce un_scce; /* SCC end */
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struct mscpv_onlc un_onlc; /* on line command */
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struct mscpv_onle un_onle; /* on line end */
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struct mscpv_guse un_guse; /* get unit status */
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struct mscpv_erd un_erd; /* error datagram */
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} mscp_un;
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/*???*/ long mscp_xxx; /* pad to 64 bytes */
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};
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/*
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* Define message length according to the DEC specifications by dropping
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* the four byte header.
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*/
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#define MSCP_MSGLEN (sizeof (struct mscp) - 4)
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/*
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* Shorthand
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*/
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/*
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* Generic packet
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*/
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#define mscp_seq mscp_un.un_seq
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/*
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* Set Controller Characteristics packet
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*/
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#define mscp_sccc mscp_un.un_sccc
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/*
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* Set Controller Characteristics end packet
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*/
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#define mscp_scce mscp_un.un_scce
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/*
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* Online / Set Unit Characteristics command packet
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*/
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#define mscp_onlc mscp_un.un_onlc
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/*
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* Online end packet
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*/
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#define mscp_onle mscp_un.un_onle
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/*
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* Get Unit Status end packet
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*/
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#define mscp_guse mscp_un.un_guse
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/*
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* MSCP Error Log packet
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*/
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#define mscp_erd mscp_un.un_erd
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/*
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* MSCP seq_addr field actually belongs to overall packet.
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*/
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#define mscp_addr mscp_seq.seq_addr
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/*
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* Macros to break up mscp_msgtc, and types.
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*/
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#define MSCP_MSGTYPE(m) ((m) & 0xf0)
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#define MSCP_CREDITS(m) ((m) & 0x0f)
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#define MSCPT_SEQ 0x00 /* sequential message */
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#define MSCPT_DATAGRAM 0x10 /* error datagram */
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#define MSCPT_CREDITS 0x20 /* credit notification */
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#define MSCPT_MAINTENANCE 0xf0 /* who knows */
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/*
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* Here begin more perhaps brash assumptions about MSCP devices...
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*/
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/*
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* MSCP controllers have `command rings' and `response rings'. A
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* command ring is a pool of MSCP packets that the host uses to give
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* commands to the controller; a response ring is a pool of MSCP
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* packets that the controller uses to give back responses. Entries
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* in the command and response rings are `owned' by either the host
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* or the controller; only the owner is allowed to alter any of the
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* fields in the MSCP packet. Thus, free command packets are owned
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* by the host, and free response packets by the controller. When
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* the host gives a packet to the controller, it tells the controller
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* by touching a device register; when the controller gives a response
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* to the host, it generates an interrupt if enabled, and sets
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* a device register as well.
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*
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* The pool is `described' by a set of pointers to the packets, along
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* with the two flags below.
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*/
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#define MSCP_OWN 0x80000000 /* controller owns this packet */
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#define MSCP_INT 0x40000000 /* controller should interrupt */
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