142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
#ident "@(#)message.h 1.1 94/10/31 SMI"
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/*
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* Copyright (c) 1988, 1989, 1990 Sun Microsystems, Inc.
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*/
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#ifndef _scsi_generic_message_h
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#define scsi_generic_message_h
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/*
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* Defined Messages For SCSI.
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*
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* The following defines are derived from
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* the proposed SCSI-2 specification,
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* revision 8 (3/16/89).
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*/
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/*
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* The proposed SCSI-2 specification defines
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* message codes 0x00, 0x02-0x1F, as fixed
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* single byte messages, 0x01 as indicating
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* extended (multi-byte) messages, 0x20-0x2F
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* as fixed two byte messages, and 0x80-0xFF
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* as IDENTIFY messages.
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*/
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#define MSG_COMMAND_COMPLETE 0x00
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#define MSG_SAVE_DATA_PTR 0x02
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#define MSG_RESTORE_PTRS 0x03
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#define MSG_DISCONNECT 0x04
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#define MSG_INITIATOR_ERROR 0x05
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#define MSG_ABORT 0x06
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#define MSG_REJECT 0x07
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#define MSG_NOP 0x08
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#define MSG_MSG_PARITY 0x09
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#define MSG_LINK_CMPLT 0x0A
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#define MSG_LINK_CMPLT_FLAG 0x0B
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#define MSG_DEVICE_RESET 0x0C
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#define MSG_ABORT_TAG 0x0D
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#define MSG_CLEAR_QUEUE 0x0E
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#define MSG_INITIATE_RECOVERY 0x0F
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#define MSG_RELEASE_RECOVERY 0x10
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#define MSG_TERMINATE_PROCESS 0x11
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/*
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* Codes 0x12-0x1F reserved
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*/
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/*
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* Message code 0x01 indicates an extended
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* (two or more) byte message. The EXTENDED
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* message byte is followed immediately by
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* a message length byte and then an extended
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* message code byte.
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*
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* Note: The EXTENDED IDENTIFY message has been
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* dropped from SCSI in the proposed level 2 spec.
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*
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* Extended Message Codes 0x04-0x7F are reserved.
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* Extended Messaqe Codes 0x80-0xFF are vendor unique.
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*
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*/
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#define MSG_EXTENDED 0x01
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# define MSG_MODIFY_DATA_PTR 0x00
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# define MSG_SYNCHRONOUS 0x01
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# define MSG_IDENTIFY_EXTENDED 0x02
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# define MSG_WIDE_DATA_XFER 0x03
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/*
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* Message codes 0x20-0x2F are fixed two byte messages.
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* Codes 0x24-0x2F are currently reserved.
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*/
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#define MSG_SIMPLE_QTAG 0x20
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#define MSG_HEAD_QTAG 0x21
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#define MSG_ORDERED_QTAG 0x22
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#define MSG_IGNORE_WIDE_RESID 0x23
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/*
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* Codes 0x80-0xFF are identify messages, indicated
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* by the setting of the most significant bit in the
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* message (0x80).
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*/
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#define MSG_IDENTIFY 0x80
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/*
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* Initiators will set bit 6 in an Identify message
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* to indicate whether or not they can accommodate
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* disconnect/reconnect
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*/
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#define INI_CAN_DISCON 0x40
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/*
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* ..so we can have a compound definition
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* for Initiators that can accommodate
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* disconnect/reconnect
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*/
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#define MSG_DR_IDENTIFY (MSG_IDENTIFY|INI_CAN_DISCON)
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/*
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* Bit 5 of the identify message specifies that, if zero,
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* that the IDENTIFY message is directed to a logical unit,
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* and if one, that the IDENTIFY message is directed to a
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* target routine that does not involve a logical unit.
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*/
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#define MSG_LUNTAR 0x20
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/*
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* Bits 2-0 identify either the logical unit or the target
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* routine number based upon whether MSG_LUNTAR is clear
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* or set.
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*/
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#define MSG_LUNRTN 0x07
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/*
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* Bits 4-3 are reserved and must be zero.
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*/
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#define BAD_IDENTIFY 0x18
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/*
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* These macros may be useful to quickly determine the
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* length of a message based upon the message code.
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*/
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#define IS_IDENTIFY_MSG(msg) \
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(((msg) & MSG_IDENTIFY) && !((msg) & BAD_IDENTIFY))
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#define IS_EXTENDED_MSG(msg) ((msg) == MSG_EXTENDED)
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#define IS_2BYTE_MSG(msg) (((msg) & 0xF0) == 0x20)
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#define IS_1BYTE_MSG(msg) (!(IS_EXTENDED_MSG((msg))) && \
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((((msg) & 0xF0) == 0) || IS_IDENTIFY_MSG((msg))))
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#endif _scsi_generic_message_h
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