e873dbd7ad
another function, always doing a page 0 MODE SENSE to get the block descriptor if we use READ CAPACITY, and use SMS_DBD on the page 4/5 MODE SENSE. This does one extra command in some cases, but it separates and simplifies the code a little. Why do we prefer READ CAPACITY over READ FORMAT CAPACITIES? Two reasons: 1) It's much older and is much less likely to have had its command code abused, and is thus "safer" to try first. 2) ALL of my USB flash readers and pen drives screw up their capacity descriptors -- mostly off-by-one errors in the size (they return the maximum LBA number instead, a la READ CAPACITY, which has *never* been how READ FORMAT CAPACITIES was documented in the MMC spec), and one returns the "no media" code on slots that have media inserted (despite returning almost-correct data otherwise)! F*** me with a chainsaw.
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* $NetBSD: scsipi_disk.h,v 1.9 2003/09/17 23:33:43 mycroft Exp $ */
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/*
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* SCSI and SCSI-like interfaces description
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*/
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/*
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* Some lines of this file come from a file of the name "scsi.h"
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* distributed by OSF as part of mach2.5,
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* so the following disclaimer has been kept.
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*
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* Copyright 1990 by Open Software Foundation,
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* Grenoble, FRANCE
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*
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* All Rights Reserved
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies and
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* that both the copyright notice and this permission notice appear in
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* supporting documentation, and that the name of OSF or Open Software
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* Foundation not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission.
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*
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* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Largely written by Julian Elischer (julian@tfs.com)
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* for TRW Financial Systems.
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*
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* TRW Financial Systems, in accordance with their agreement with Carnegie
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* Mellon University, makes this software available to CMU to distribute
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* or use in any manner that they see fit as long as this message is kept with
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* the software. For this reason TFS also grants any other persons or
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* organisations permission to use or modify this software.
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*
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* TFS supplies this software to be publicly redistributed
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* on the understanding that TFS is not responsible for the correct
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* functioning of this software in any circumstances.
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*
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* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
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*/
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#ifndef _DEV_SCSIPI_SCSIPI_DISK_H_
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#define _DEV_SCSIPI_SCSIPI_DISK_H_
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/*
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* SCSI command format
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*/
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#define READ_BIG 0x28
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#define WRITE_BIG 0x2a
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struct scsipi_rw_big {
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u_int8_t opcode;
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u_int8_t byte2;
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#define SRWB_RELADDR 0x01
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#define SRWB_FUA 0x08 /* force unit access */
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#define SRWB_DPO 0x10 /* disable page out */
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u_int8_t addr[4];
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u_int8_t reserved;
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u_int8_t length[2];
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u_int8_t control;
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} __attribute__((packed));
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#define READ_CAPACITY 0x25
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struct scsipi_read_capacity {
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u_int8_t opcode;
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u_int8_t byte2;
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u_int8_t addr[4];
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u_int8_t unused[3];
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u_int8_t control;
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} __attribute__((packed));
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/* DATAs definitions for the above commands */
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struct scsipi_read_cap_data {
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u_int8_t addr[4];
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u_int8_t length[4];
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} __attribute__((packed));
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#define READ_FORMAT_CAPACITIES 0x23
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struct scsipi_read_format_capacities {
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u_int8_t opcode;
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u_int8_t byte2;
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u_int8_t reserved1[5];
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u_int8_t length[2];
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u_int8_t reserved2[3];
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} __attribute__((packed));
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struct scsipi_capacity_list_header {
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u_int8_t reserved[3];
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u_int8_t length;
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} __attribute__((packed));
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struct scsipi_capacity_descriptor {
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u_int8_t nblks[4];
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u_int8_t byte5;
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u_int8_t blklen[3];
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} __attribute__((packed));
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/* codes only valid in the current/maximum capacity descriptor */
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#define SCSIPI_CAP_DESC_CODE_MASK 0x3
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#define SCSIPI_CAP_DESC_CODE_RESERVED 0x0
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#define SCSIPI_CAP_DESC_CODE_UNFORMATTED 0x1
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#define SCSIPI_CAP_DESC_CODE_FORMATTED 0x2
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#define SCSIPI_CAP_DESC_CODE_NONE 0x3
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#endif /* _DEV_SCSIPI_SCSIPI_DISK_H_ */
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