usr/src/sys/stand.att/saio.h

/*
 * Copyright (c) 1982, 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)saio.h      7.11 (Berkeley) %G%
 */

#include "saioctl.h"
#include "saerrno.h"

#define UNIX    "hd(6,0,0) /vmunix"
#define NULL    0

/*
 * Io block: includes an inode, cells for the use of seek, etc.,
 * and a buffer.
 */
struct iob {
        int     i_flgs;         /* see F_ below */
        int     i_adapt;        /* adapter or bus */
        int     i_ctlr;         /* controller */
        int     i_unit;         /* pseudo device unit */
        int     i_part;         /* disk partition */
        daddr_t i_boff;         /* block offset on device */
        struct  inode i_ino;    /* inode, if file */
        daddr_t i_cyloff;       /* cylinder offset on device */
        off_t   i_offset;       /* seek offset in file */
        daddr_t i_bn;           /* 1st block # of next read */
        char    *i_ma;          /* memory address of i/o buffer */
        int     i_cc;           /* character count of transfer */
        int     i_error;        /* error # return */
        int     i_errcnt;       /* error count for driver retries */
        int     i_errblk;       /* block # in error for error reporting */
        char    i_buf[MAXBSIZE];/* i/o buffer */
        union {
                struct fs ui_fs;        /* file system super block info */
                char dummy[SBSIZE];
        } i_un;
};

#define i_fs    i_un.ui_fs
#define i_bus   i_adapt

/* codes for sector header word 1 */
#define HDR1_FMT22      0x1000  /* standard 16 bit format */
#define HDR1_OKSCT      0xc000  /* sector ok */
#define HDR1_SSF        0x2000  /* skip sector flag */

#define F_READ          0x0001  /* file opened for reading */
#define F_WRITE         0x0002  /* file opened for writing */
#define F_ALLOC         0x0004  /* buffer allocated */
#define F_FILE          0x0008  /* file instead of device */
#define F_NBSF          0x0010  /* no bad sector forwarding */
#define F_ECCLM         0x0020  /* limit # of bits in ecc correction */
#define F_SSI           0x0040  /* set skip sector inhibit */
#define F_SEVRE         0x0080  /* Severe burnin (no retries, no ECC) */

/* io types */
#define F_RDDATA        0x0100  /* read data */
#define F_WRDATA        0x0200  /* write data */
#define F_HDR           0x0400  /* include header on next i/o */
#define F_CHECK         0x0800  /* perform check of data read/write */
#define F_HCHECK        0x1000  /* perform check of header and data */

#define F_TYPEMASK      0xff00

#define READ    F_READ
#define WRITE   F_WRITE

/*
 * Lseek call.
 */
#define L_SET           0       /* absolute offset */

/*
 * Device switch.
 */
struct devsw {
        char    *dv_name;
        int     (*dv_strategy)();
        int     (*dv_open)();
        int     (*dv_close)();
        int     (*dv_ioctl)();
};

extern struct devsw devsw[];    /* device array */
extern int ndevs;               /* number of elements in devsw[] */

#ifdef COMPAT_42
/*
 * Old drive description table.
 * still used by some drivers for now.
 */
struct st {
        short   nsect;          /* # sectors/track */
        short   ntrak;          /* # tracks/surfaces/heads */
        short   nspc;           /* # sectors/cylinder */
        short   ncyl;           /* # cylinders */
        short   *off;           /* partition offset table (cylinders) */
};
#endif

#define NFILES  4
extern struct   iob iob[NFILES];