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Annotation of 43BSDTahoe/sys/stand/saio.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1988 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)saio.h      7.6 (Berkeley) 5/23/89
        !            18:  */
        !            19: 
        !            20: #include "saioctl.h"
        !            21: #include "saerrno.h"
        !            22: 
        !            23: #define        UNIX    "hd(6,0,0) /vmunix"
        !            24: #define        NULL    0
        !            25: 
        !            26: /*
        !            27:  * Io block: includes an inode, cells for the use of seek, etc.,
        !            28:  * and a buffer.
        !            29:  */
        !            30: struct iob {
        !            31:        int     i_flgs;         /* see F_ below */
        !            32:        int     i_adapt;        /* adapter or bus */
        !            33:        int     i_ctlr;         /* controller */
        !            34:        int     i_unit;         /* pseudo device unit */
        !            35:        int     i_part;         /* disk partition */
        !            36:        daddr_t i_boff;         /* block offset on device */
        !            37:        struct  inode i_ino;    /* inode, if file */
        !            38:        daddr_t i_cyloff;       /* cylinder offset on device */
        !            39:        off_t   i_offset;       /* seek offset in file */
        !            40:        daddr_t i_bn;           /* 1st block # of next read */
        !            41:        char    *i_ma;          /* memory address of i/o buffer */
        !            42:        int     i_cc;           /* character count of transfer */
        !            43:        int     i_error;        /* error # return */
        !            44:        int     i_errcnt;       /* error count for driver retries */
        !            45:        int     i_errblk;       /* block # in error for error reporting */
        !            46:        char    i_buf[MAXBSIZE];/* i/o buffer */
        !            47:        union {
        !            48:                struct fs ui_fs;        /* file system super block info */
        !            49:                char dummy[SBSIZE];
        !            50:        } i_un;
        !            51: };
        !            52: 
        !            53: #define        i_fs    i_un.ui_fs
        !            54: #define        i_bus   i_adapt
        !            55: 
        !            56: /* codes for sector header word 1 */
        !            57: #define        HDR1_FMT22      0x1000  /* standard 16 bit format */
        !            58: #define        HDR1_OKSCT      0xc000  /* sector ok */
        !            59: #define        HDR1_SSF        0x2000  /* skip sector flag */
        !            60: 
        !            61: #define        F_READ          0x0001  /* file opened for reading */
        !            62: #define        F_WRITE         0x0002  /* file opened for writing */
        !            63: #define        F_ALLOC         0x0004  /* buffer allocated */
        !            64: #define        F_FILE          0x0008  /* file instead of device */
        !            65: #define        F_NBSF          0x0010  /* no bad sector forwarding */
        !            66: #define        F_ECCLM         0x0020  /* limit # of bits in ecc correction */
        !            67: #define        F_SSI           0x0040  /* set skip sector inhibit */
        !            68: #define        F_SEVRE         0x0080  /* Severe burnin (no retries, no ECC) */
        !            69: 
        !            70: /* io types */
        !            71: #define        F_RDDATA        0x0100  /* read data */
        !            72: #define        F_WRDATA        0x0200  /* write data */
        !            73: #define        F_HDR           0x0400  /* include header on next i/o */
        !            74: #define        F_CHECK         0x0800  /* perform check of data read/write */
        !            75: #define        F_HCHECK        0x1000  /* perform check of header and data */
        !            76: 
        !            77: #define        F_TYPEMASK      0xff00
        !            78: 
        !            79: #define        READ    F_READ
        !            80: #define        WRITE   F_WRITE
        !            81: 
        !            82: /*
        !            83:  * Lseek call.
        !            84:  */
        !            85: #define        L_SET           0       /* absolute offset */
        !            86: 
        !            87: /*
        !            88:  * Device switch.
        !            89:  */
        !            90: struct devsw {
        !            91:        char    *dv_name;
        !            92:        int     (*dv_strategy)();
        !            93:        int     (*dv_open)();
        !            94:        int     (*dv_close)();
        !            95:        int     (*dv_ioctl)();
        !            96: };
        !            97: 
        !            98: extern struct devsw devsw[];   /* device array */
        !            99: extern int ndevs;              /* number of elements in devsw[] */
        !           100: 
        !           101: #ifdef COMPAT_42
        !           102: /*
        !           103:  * Old drive description table.
        !           104:  * still used by some drivers for now.
        !           105:  */
        !           106: struct st {
        !           107:        short   nsect;          /* # sectors/track */
        !           108:        short   ntrak;          /* # tracks/surfaces/heads */
        !           109:        short   nspc;           /* # sectors/cylinder */
        !           110:        short   ncyl;           /* # cylinders */
        !           111:        short   *off;           /* partition offset table (cylinders) */
        !           112: };
        !           113: #endif
        !           114: 
        !           115: #define        NFILES  4
        !           116: extern struct  iob iob[NFILES];

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