scsivar.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

	    u_char	speed:4;	/* was mbz2 now speed 		      */
	    u_char	bufmode:3;	/* Buffered Mode		      */
	    u_char	wp:1;		/* Write Protect		      */
	    u_char	bdeclen;	/* Block Descriptor Length	      */
	/* Parameter List Block Descriptor */
	    u_char	density;	/* was mbz3 now density		      */
	    u_char	numofblk2;	/* Number of Blocks (MSB)	      */
	    u_char	numofblk1;	/* Number of Blocks 		      */
	    u_char	numofblk0;	/* Number of Blocks (LSB)	      */
	    u_char		:8;	/* Reserved			      */
	    u_char	blklen2;	/* Block Length (MSB)		      */
	    u_char	blklen1;	/* Block Length 		      */
	    u_char	blklen0;	/* Block Length (LSB)		      */
	    u_char	vulen;		/* Vendor Unique Length		      */
	    u_char	nof:2;		/* Enable Fillers		      */
	    u_char	mbz4:5;		/* Must be Zero			      */
	    u_char	vu7:1;		/* Direct Track Access		      */
	    u_char	pad[6];		/* Pad				      */
	    u_char	pad1[24];
	}modsns;
	/*
	 * MODE SENSE Data for DISKS
	 */
	struct sz_rzmodsns_dt {
	/* Parameter List Header	*/
	    u_char	sdlen;		/* Sense Data Length		      */
	    u_char	medtyp;		/* Medium Type			      */
	    u_char		: 7;	/* Reserved			      */
	    u_char	wp	: 1;	/* Write Protect		      */
	    u_char	bdlen;		/* Block Descriptor Length	      */
	/* Parameter List Block Descriptor */
	    u_char	dencode;	/* Density Code			      */
	    u_char	nblks2;		/* Number of Blocks (MSB)	      */
	    u_char	nblks1;		/* Number of Blocks 		      */
	    u_char	nblks0;		/* Number of Blocks (LSB)	      */
	    u_char		: 8;	/* Reserved			      */
	    u_char	blklen2;	/* Block Length (MSB)		      */
	    u_char	blklen1;	/* Block Length 		      */
	    u_char	blklen0;	/* Block Length (LSB)		      */
	/* Parameter List Page Data (32 bytes, one page only) */
	    u_char	mspage[32];	/* Page header and data		      */
	}rzmodsns;
	/*
	 * RECEIVE DIAGNOSTIC RESULT Data
	 */
	struct sz_recdiag_dt {
	    u_char	ctlr_hd_rev;	/* Controller hardware revision level */
	    u_char	ctlr_fw_rev;	/* Controller firmware revision level */
	    u_char	ctlr_selftest;	/* Controller selftest  0 = Passed    */
					/*                      1 = Failed    */
	    u_char	drv_hw_rev;	/* Drive hardware revision level      */
	    u_char	drv_fw_rev;	/* Drive firmware revision level      */
	    u_char	drv_selftest;	/* Drive selftest  0 = Passed	      */
					/*		  xx = Failure Code   */
	/* TODO: why no pad? */
	}recdiag;
    }dat;
};

/*
 * Define Masks for SCSI Group Codes.
 */
#define	SCSI_GROUP_0		0x00	/* SCSI Group Code 0.		*/
#define SCSI_GROUP_1		0x20	/* SCSI Group Code 1.		*/
#define SCSI_GROUP_2		0x40	/* SCSI Group Code 2.		*/
#define SCSI_GROUP_3		0x60	/* SCSI Group Code 3.		*/
#define SCSI_GROUP_4		0x80	/* SCSI Group Code 4.		*/
#define SCSI_GROUP_5		0xA0	/* SCSI Group Code 5.		*/
#define SCSI_GROUP_6		0xC0	/* SCSI Group Code 6.		*/
#define SCSI_GROUP_7		0xE0	/* SCSI Group Code 7.		*/
#define SCSI_GROUP_MASK		0xE0	/* SCSI Group Code mask.	*/

/*
 * SCSI Command Opcodes:
 */
#define	SZ_TUR		0x00		/* TEST UNIT READY Command	      */
#define SZ_REWIND	0x01		/* REWIND Command		      */
#define SZ_RQSNS	0x03		/* REQUEST SENSE Command	      */
#define SZ_RBL		0x05		/* READ BLOCK LIMITS Command	      */
#define	SZ_READ		0x08		/* READ Command			      */
#define SZ_WRITE	0x0a		/* WRITE Command		      */
#define SZ_TRKSEL	0x0b		/* TRACK SELECT Comand		      */
#define SZ_RESUNIT	0x16		/* RESERVE UNIT Command		      */
#define SZ_WFM		0x10		/* WRITE FILEMARKS Command	      */
#define SZ_SPACE	0x11		/* SPACE Command		      */
#define SZ_INQ		0x12		/* INQUIRY Command		      */
#define SZ_VFY		0x13		/* VERIFY Command		      */
#define SZ_RBD		0x14		/* RECOVER BUFFERED DATA Command      */
#define SZ_MODSEL	0x15		/* MODE SELECT Command		      */
#define SZ_RELUNIT	0x17		/* RELEASE UNIT Command		      */
#define SZ_ERASE	0x19		/* ERASE Command		      */
#define SZ_MODSNS	0x1a		/* MODE SENSE Command		      */
#define	SZ_SSLU		0x1b		/* START/STOP or LOAD/UNLOAD Command  */
#define SZ_RECDIAG	0x1c		/* RECEIVE DIAGNOSTIC RESULT Command  */
#define SZ_SNDDIAG	0x1d		/* SEND DIAGNOSTIC Command	      */
#define	SZ_RDCAP	0x25		/* DISK: READ CAPACITY		      */
#define SZ_FORMAT	0x04		/* DISK: FORMAT UNIT Command	      */
#define SZ_REASSIGN	0x07		/* DISK: REASSIGN BLOCK Command	      */
#define SZ_READ_10	0x28		/* DISK: READ 10-byte Command.	      */
#define SZ_WRITE_10	0x2A		/* DISK: WRITE 10-byte Command.	      */
#define SZ_VFY_DATA	0x2f		/* DISK: VERIFY DATA Command	      */
#define SZ_RDD		0x37		/* DISK: READ DEFECT DATA Command     */
#define SZ_READL	0x3E		/* DISK: READ LONG Command            */
#define SZ_WRITEL	0x3F		/* DISK: WRITE LONG Command           */
#define RZSPECIAL	0x8000		/* DISK: set for special disk commands*/

/*
 * Group 2 - Psuedo SCSI Commands.
 */
#define SZ_P_FSPACER	0x40		/* Psuedo opcode for space record     */
#define SZ_P_FSPACEF	0x41		/* Psuedo opcode for space file	      */
#define SZ_P_BSPACER	0x42		/* Psuedo opcode for backspace record */
#define SZ_P_BSPACEF	0x43		/* Psuedo opcode for backspace file   */
#define SZ_P_CACHE	0x44		/* Psuedo opcode for buffered mode    */
#define SZ_P_NOCACHE	0x45		/* Psuedo opcode for no buffered mode */
#define SZ_P_LOAD	0x46		/* Pseudo opcode for load (not used)  */
#define SZ_P_UNLOAD	0x47		/* Pseudo opcode for unload           */
#define SZ_P_SSUNIT	0x48		/* Pseudo opcode for start/stop unit  */
#define SZ_P_RETENSION	0x49		/* Psuedo opcode for retension	      */

/*
 * SCSI Command Data structure names shortened
 */
#define szdt_exsns	sz_datfmt.dat.exsns	/* EXTENDED SENSE Data	      */
#define szdt_rbl	sz_datfmt.dat.rbl	/* READ BLOCK LIMITS Data     */
#define	szdt_rdcap	sz_datfmt.dat.rdcap	/* DISK: READ CAPACITY Data   */
#define	szdt_inq	sz_datfmt.dat.inq	/* INQUIRY Data		      */
#define szdt_modsel	sz_datfmt.dat.modsel	/* MODE SELECT Data	      */
#define szdt_modsns	sz_datfmt.dat.modsns	/* MODE SENSE Data	      */
/*
 * SCSI STATUS Byte
 */
#define	SZ_GOOD		0x00	/* Good					      */
#define	SZ_CHKCND	0x02	/* Check Condition			      */
#define	SZ_BUSY		0x08	/* Device cannot accept a command (busy)      */
#define SZ_INTRM	0x10	/* Intermediate				      */
#define SZ_RESCNF	0x18	/* Reservation Conflict			      */
/*
 * Fake SCSI STATUS Byte.
 */
#define	SZ_BAD		0xff	/* Fatal error command (couldn't do RQSNS)    */
/*
 * SCSI Message Protocols
 */
#define	SZ_CMDCPT	0x00	/* Command Complete			      */
#define	SZ_EXTMSG	0x01	/* Extended message			      */
#define SZ_SDP		0x02	/* Save Data Pointers			      */
#define SZ_RDP		0x03	/* Restore Data Pointers (DISK: new)	      */
#define SZ_DISCON	0x04	/* Disconnect				      */
#define	SZ_IDE		0x05	/* Initiator Detected Error		      */
#define SZ_ABT		0x06	/* Abort				      */
#define SZ_MSGREJ	0x07	/* Message Reject			      */
#define SZ_NOP		0x08	/* No Operation				      */
#define SZ_MSGPE	0x09	/* Message Parity Error			      */
#define SZ_LNKCMP	0x0a	/* Linked Command Complete		      */
#define SZ_LNKCMPF	0x0b	/* Linked Command Complete with Flag	      */
#define SZ_DEVRST	0x0c	/* Bus Device Reset			      */
#define SZ_ID_NODIS	0x80	/* IDENTIFY wo/ disconnect capability,	      */
#define SZ_ID_DIS	0xc0	/* IDENTIFY w/ disconnect capability,	      */

/*
 * SCSI Extended Message Codes
 */
#define	SZ_MOD_DP	0x00	/* Modify Data Pointer			      */
#define	SZ_SYNC_XFER	0x01	/* Synchronous Data Transfer Request          */
#define	SZ_EXT_ID	0x02	/* Extended Identify			      */

/*
 * Command Data allocation constants
 */
#define	SZ_INQ_MAXLEN	44	/* number of bytes for INQUIRY data (MAX)     */
#define	SZ_INQ_MINLEN	 5	/* number of bytes for INQUIRY data (MIN)     */
				/* next 3 must match sz_inq_dt struct below   */
#define	SZ_VID_LEN	 8	/* INQUIRY data vendor ID field length	      */
#define	SZ_PID_LEN	16	/* INQUIRY data product ID field length       */
#define	SZ_REV_LEN	 4	/* INQUIRY data revision level field length   */

#define SZ_RECDIAG_LEN	 6	/* number of bytes for RECEIVE DIAG data      */
#define	SZ_RDCAP_LEN	 8	/* number of bytes for READ CAPACITY data     */
#define SZ_RQSNS_LEN	20	/* number of bytes for REQUEST SENSE data     */
#define SZ_MODSNS_LEN	14	/* number of bytes for MODE SENSE data	      */
#define SZ_MODSEL_LEN	14	/* number of bytes for MODE SELECT data	      */
				/* NOTE: DATAO: subtracts 2 for disk/cdrom */
#define SZ_MAX_DT_LEN	44	/* Size of sz_datfmt structure		      */

/*
 * Command Packet Length constants
 */
#define SZ_MAX_CMD_LEN		22	/* maximum command length in bytes    */
#define SZ_MODSEL_CMD_LEN	20	/* maximum length of modsel command   */
#define	SZ_RDCAP_CMD_LEN	10	/* length of DISK read capacity cmd   */
#define SZ_CMD_LEN		 6	/* length of commands in bytes	      */

/*
 * Define Maximum Logical Block Address (LBA) for a 6-byte CDB.
 */
#define SZ_MAX_LBA		0x1fffff /* Maximum 6-byte CDB LBA.	*/

/*
 * Miscellaneous Constants
 */
#define	SZ_DEFAULT_FILLS	7	/* Default number of fills that can   */
					/* be written to keep tape streaming. */
#define DEFAULT_SCSIID          7       /* Default system scsi id             */

/*
 * MACRO for converting a longword to a byte
 *	args - the longword
 *	     - which byte in the longword you want
 */
#define	LTOB(a,b)	((a>>(b*8))&0xff)

/* MACROS for timing out spin loops.
 *
 *	desc:	Waits while expression is true.
 *
 *	args:	expr 		- expression to spin on
 *		spincount 	- amount of time to wait in microseconds
 *		retval		- return value of this macro
 */
#define	SZWAIT_WHILE(expr,spincount,retval) {				\
		for (retval = 0; ((retval < 100) && (expr)); retval++);	\
		while ((expr) && ( retval < spincount)) {		\
			DELAY(100);					\
			retval++;					\
		}							\
	}

/*
 * 	desc: Waits unitl expression is true.
 */
#define SZWAIT_UNTIL(expr,spincount,retval) {				\
		SZWAIT_WHILE((!expr),spincount,retval);			\
	}


/*
 * macro for converting the density selection in the
 * minor number out of the buf struct into a tape option
 * struct index.
*/
#define DENS_IDX(bp)    ((((minor(bp->b_dev))&DENS_MASK)>>3))

/*
 * Request Sense Sense Key Codes.
 * Sense keys without comments are unsupported
 * becasue DEC devices don't use them.
 * TODO: comments are tape specific should be general?
 */
#define SZ_NOSENSE	0x00	/* Successful cmd or EOT, ILI, FILEMARK	      */
#define SZ_RECOVERR	0x01	/* Successful cmd with controller recovery    */
#define SZ_NOTREADY	0x02	/* Device present but not ready		      */
#define	SZ_MEDIUMERR	0x03	/* Cmd terminated with media flaw	      */
#define SZ_HARDWARE	0x04	/* Controller or drive hardware error	      */
#define SZ_ILLEGALREQ	0x05	/* Illegal command or command parameters      */
#define SZ_UNITATTEN	0x06	/* Unit Attention			      */
#define SZ_DATAPROTECT	0x07	/* Write attempted to write protected media   */
#define SZ_BLANKCHK	0x08	/* Read zero length record (EOD)	      */
#define	SZ_VNDRUNIQUE	0x09
#define	SZ_COPYABORTD	0x0a
#define SZ_ABORTEDCMD	0x0b	/* Cmd aborted that may retry successfully    */
#define	SZ_EQUAL	0x0c
#define SZ_VOLUMEOVFL	0x0d	/* Buffer data left over after EOM	      */
#define SZ_MISCOMPARE	0x0e	/* Miscompare on Verify command		      */
#define	SZ_RESERVED	0x0f
/* Additional sence code values for extended sence data. */

#define	SZ_ASC_RRETRY	0x17
#define	SZ_ASC_RERROR	0x18

/*
 * Top Level State Machine
 */
/* Status/Positioning States */
#define	SZ_NEXT		 0	/* Process next request from queue	      */
#define SZ_SP_START	 1	/* Start a Status or Positioning Operation    */
#define SZ_SP_CONT	 2	/* Continue SZ_SP_SETUP:		      */
/* Read/Write (DMA) States */
#define	SZ_RW_START	 3	/* Setup a Read or Write Operation	      */
#define	SZ_RW_CONT	 4	/* Start/Continue a Read or Write Operation   */
#define SZ_R_STDMA	 5	/* Start DMA READ			      */
#define	SZ_W_STDMA	 6	/* Start DMA WRITE			      */
#define SZ_R_DMA	 7	/* Read DMA processing			      */
#define SZ_W_DMA	 8	/* Write DMA processing			      */
#define SZ_R_COPY	 9	/* Copy READ data to memory		      */
#define SZ_ERR		10	/* DMA Error				      */
/*
 * Bottom Level State Machine
 */
#define SZ_SP_ARB	 0	/* Arbitrate for the Bus		      */
#define SZ_SP_SEL	 1	/* Select the target device		      */
#define SZ_CMD_PHA	 2	/* Command Phase			      */
#define SZ_DATAO_PHA	 3	/* Data Out Phase			      */
#define SZ_DATAI_PHA	 4	/* Data In Phase			      */
#define SZ_STATUS_PHA	 5	/* Status Phase				      */
#define SZ_MESSI_PHA	 6	/* Message In Phase			      */
#define SZ_MESSO_PHA	 7	/* Message Out Phase			      */
#define SZ_RELBUS	 8	/* Release the Bus			      */


/*
 * define for fixed block tape units scsi.
 * Since there are no record boundaries we 
 * now must remember if a tape mark is pending
*/
#define TPMARK_PENDING	0X80000000



#endif /*	SCSIVAR_INCLUDE */