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Annotation of tme/scsi/acb4000.c, revision 1.1

1.1     ! root        1: /* $Id: acb4000.c,v 1.4 2003/10/16 02:34:28 fredette Exp $ */
        !             2: 
        !             3: /* scsi/acb4000.c - ACB4000 SCSI disk emulation: */
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 2003 Matt Fredette
        !             7:  * All rights reserved.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms, with or without
        !            10:  * modification, are permitted provided that the following conditions
        !            11:  * are met:
        !            12:  * 1. Redistributions of source code must retain the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer.
        !            14:  * 2. Redistributions in binary form must reproduce the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer in the
        !            16:  *    documentation and/or other materials provided with the distribution.
        !            17:  * 3. All advertising materials mentioning features or use of this software
        !            18:  *    must display the following acknowledgement:
        !            19:  *      This product includes software developed by Matt Fredette.
        !            20:  * 4. The name of the author may not be used to endorse or promote products
        !            21:  *    derived from this software without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            25:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        !            26:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
        !            27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        !            31:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
        !            32:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            33:  * POSSIBILITY OF SUCH DAMAGE.
        !            34:  */
        !            35: 
        !            36: #include <tme/common.h>
        !            37: _TME_RCSID("$Id: acb4000.c,v 1.4 2003/10/16 02:34:28 fredette Exp $");
        !            38: 
        !            39: /* includes: */
        !            40: #include <tme/scsi/scsi-disk.h>
        !            41: 
        !            42: /* macros: */
        !            43: 
        !            44: /* types: */
        !            45: 
        !            46: /* this is the ACB4000 LUN addresser for LUN-aware devices: */
        !            47: static int
        !            48: _tme_acb4000_address_lun(struct tme_scsi_device *scsi_device)
        !            49: {
        !            50:   struct tme_scsi_device_sense *sense;
        !            51:   int lun;
        !            52: 
        !            53:   /* if an IDENTIFY message was sent, use that LUN: */
        !            54:   lun = scsi_device->tme_scsi_device_addressed_lun;
        !            55: 
        !            56:   /* otherwise, get the LUN from bits 5-7 of the second
        !            57:      CDB byte: */
        !            58:   if (lun < 0) {
        !            59:     lun = (scsi_device->tme_scsi_device_cdb[1] >> 5);
        !            60:     scsi_device->tme_scsi_device_addressed_lun = lun;
        !            61:   }
        !            62: 
        !            63:   /* if this LUN is not defined, and this isn't a REQUEST SENSE
        !            64:      command: */
        !            65:   if (!(scsi_device->tme_scsi_device_luns
        !            66:        & TME_BIT(lun))
        !            67:       && (scsi_device->tme_scsi_device_cdb[0]
        !            68:          != TME_SCSI_CDB_REQUEST_SENSE)) {
        !            69: 
        !            70:     /* the ACB4000 returns a nonextended sense code of 0x25
        !            71:        for an undefined LUN: */
        !            72:     sense = &scsi_device->tme_scsi_device_sense[lun];
        !            73:     
        !            74:     /* the error class and error code: */
        !            75:     sense->tme_scsi_device_sense_data[0]
        !            76:       = 0x25;
        !            77:     sense->tme_scsi_device_sense_data[1]
        !            78:       = 0;
        !            79:     sense->tme_scsi_device_sense_data[2]
        !            80:       = 0;
        !            81:     sense->tme_scsi_device_sense_data[3]
        !            82:       = 0;
        !            83:     sense->tme_scsi_device_sense_valid = 4;
        !            84: 
        !            85:     /* return the CHECK CONDITION status: */
        !            86:     tme_scsi_device_target_do_smf(scsi_device,
        !            87:                                  TME_SCSI_STATUS_CHECK_CONDITION,
        !            88:                                  TME_SCSI_MSG_CMD_COMPLETE);
        !            89:     return (EINVAL);
        !            90:   }
        !            91: 
        !            92:   return (TME_OK);
        !            93: }
        !            94: 
        !            95: /* the ACB4000 doesn't support various commands: */
        !            96: static _TME_SCSI_DEVICE_CDB_DECL(_tme_acb4000_cdb_bad)
        !            97: {
        !            98:   int lun;
        !            99:   struct tme_scsi_device_sense *sense;
        !           100:   
        !           101:   /* get the addressed LUN's sense: */
        !           102:   lun = scsi_device->tme_scsi_device_addressed_lun;
        !           103:   sense = &scsi_device->tme_scsi_device_sense[lun];
        !           104: 
        !           105:   /* the ACB4000 returns a nonextended sense code of 0x20
        !           106:      for an invalid command: */
        !           107:     
        !           108:   /* the error class and error code: */
        !           109:   sense->tme_scsi_device_sense_data[0]
        !           110:     = 0x20;
        !           111:   sense->tme_scsi_device_sense_data[1]
        !           112:     = 0;
        !           113:   sense->tme_scsi_device_sense_data[2]
        !           114:     = 0;
        !           115:   sense->tme_scsi_device_sense_data[3]
        !           116:     = 0;
        !           117:   sense->tme_scsi_device_sense_valid = 4;
        !           118:   
        !           119:   /* return the CHECK CONDITION status: */
        !           120:   tme_scsi_device_target_do_smf(scsi_device,
        !           121:                                TME_SCSI_STATUS_CHECK_CONDITION,
        !           122:                                TME_SCSI_MSG_CMD_COMPLETE);
        !           123: }
        !           124: 
        !           125: /* this initializes ACB4000 SCSI disk emulation: */
        !           126: int
        !           127: tme_scsi_disk_acb4000_init(struct tme_scsi_disk *scsi_disk)
        !           128: {
        !           129:   struct tme_scsi_device *scsi_device;
        !           130:   
        !           131:   scsi_device = &scsi_disk->tme_scsi_disk_device;
        !           132: 
        !           133:   /* ACB4000 boards don't support the INQUIRY command: */
        !           134:   TME_SCSI_DEVICE_DO_CDB(scsi_device,
        !           135:                         TME_SCSI_CDB_INQUIRY,
        !           136:                         _tme_acb4000_cdb_bad);
        !           137: 
        !           138:   /* ACB4000 boards don't support extended sense: */
        !           139:   scsi_device->tme_scsi_device_sense_no_extended
        !           140:     = TRUE;
        !           141: 
        !           142:   /* ACB4000 boards have a particular LUN addressing behavior: */
        !           143:   scsi_device->tme_scsi_device_address_lun
        !           144:     = _tme_acb4000_address_lun;
        !           145: 
        !           146:   return (TME_OK);
        !           147: }

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