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Annotation of 42BSD/sys/stand/saio.h, revision 1.1

1.1     ! root        1: /*     saio.h  6.2     9/23/83 */
        !             2: 
        !             3: /*
        !             4:  * Header file for standalone package
        !             5:  */
        !             6: 
        !             7: /*
        !             8:  * Io block: includes an
        !             9:  * inode, cells for the use of seek, etc,
        !            10:  * and a buffer.
        !            11:  */
        !            12: struct iob {
        !            13:        int     i_flgs;         /* see F_ below */
        !            14:        struct  inode i_ino;    /* inode, if file */
        !            15:        int     i_unit;         /* pseudo device unit */
        !            16:        daddr_t i_boff;         /* block offset on device */
        !            17:        daddr_t i_cyloff;       /* cylinder offset on device */
        !            18:        off_t   i_offset;       /* seek offset in file */
        !            19:        daddr_t i_bn;           /* 1st block # of next read */
        !            20:        char    *i_ma;          /* memory address of i/o buffer */
        !            21:        int     i_cc;           /* character count of transfer */
        !            22:        int     i_error;        /* error # return */
        !            23:        int     i_errcnt;       /* error count for driver retries */
        !            24:        int     i_errblk;       /* block # in error for error reporting */
        !            25:        char    i_buf[MAXBSIZE];/* i/o buffer */
        !            26:        union {
        !            27:                struct fs ui_fs;        /* file system super block info */
        !            28:                char dummy[SBSIZE];
        !            29:        } i_un;
        !            30: };
        !            31: #define i_fs i_un.ui_fs
        !            32: #define NULL 0
        !            33: 
        !            34: #define F_READ         0x1     /* file opened for reading */
        !            35: #define F_WRITE                0x2     /* file opened for writing */
        !            36: #define F_ALLOC                0x4     /* buffer allocated */
        !            37: #define F_FILE         0x8     /* file instead of device */
        !            38: #define F_NBSF         0x10    /* no bad sector forwarding */
        !            39: #define F_ECCLM                0x20    /* limit # of bits in ecc correction */
        !            40: #define F_SSI          0x40    /* set skip sector inhibit */
        !            41: #define F_SEVRE                0x80    /* Severe burnin (no retries, no ECC) */
        !            42: /* io types */
        !            43: #define        F_RDDATA        0x0100  /* read data */
        !            44: #define        F_WRDATA        0x0200  /* write data */
        !            45: #define F_HDR          0x0400  /* include header on next i/o */
        !            46: #define F_CHECK                0x0800  /* perform check of data read/write */
        !            47: #define F_HCHECK       0x1000  /* perform check of header and data */
        !            48: 
        !            49: #define        F_TYPEMASK      0xff00
        !            50: 
        !            51: /*
        !            52:  * Device switch.
        !            53:  */
        !            54: struct devsw {
        !            55:        char    *dv_name;
        !            56:        int     (*dv_strategy)();
        !            57:        int     (*dv_open)();
        !            58:        int     (*dv_close)();
        !            59:        int     (*dv_ioctl)();
        !            60: };
        !            61: 
        !            62: struct devsw devsw[];
        !            63: 
        !            64: /*
        !            65:  * Drive description table.
        !            66:  * Returned from SAIODEVDATA call.
        !            67:  */
        !            68: struct st {
        !            69:        short   nsect;          /* # sectors/track */
        !            70:        short   ntrak;          /* # tracks/surfaces/heads */
        !            71:        short   nspc;           /* # sectors/cylinder */
        !            72:        short   ncyl;           /* # cylinders */
        !            73:        short   *off;           /* partition offset table (cylinders) */
        !            74: };
        !            75: 
        !            76: /*
        !            77:  * Request codes. Must be the same a F_XXX above
        !            78:  */
        !            79: #define        READ    1
        !            80: #define        WRITE   2
        !            81: 
        !            82: #define        NBUFS   4
        !            83: 
        !            84: char   b[NBUFS][MAXBSIZE];
        !            85: daddr_t        blknos[NBUFS];
        !            86: 
        !            87: #define        NFILES  4
        !            88: struct iob iob[NFILES];
        !            89: 
        !            90: extern int errno;      /* just like unix */
        !            91: 
        !            92: /* error codes */
        !            93: #define        EBADF   1       /* bad file descriptor */
        !            94: #define        EOFFSET 2       /* relative seek not supported */
        !            95: #define        EDEV    3       /* improper device specification on open */
        !            96: #define        ENXIO   4       /* unknown device specified */
        !            97: #define        EUNIT   5       /* improper unit specification */
        !            98: #define        ESRCH   6       /* directory search for file failed */
        !            99: #define        EIO     7       /* generic error */
        !           100: #define        ECMD    10      /* undefined driver command */
        !           101: #define        EBSE    11      /* bad sector error */
        !           102: #define        EWCK    12      /* write check error */
        !           103: #define        EECC    13      /* uncorrectable ecc error */
        !           104: #define        EHER    14      /* hard error */
        !           105: 
        !           106: /* ioctl's -- for disks just now */
        !           107: #define        SAIOHDR         (('d'<<8)|1)    /* next i/o includes header */
        !           108: #define        SAIOCHECK       (('d'<<8)|2)    /* next i/o checks data */
        !           109: #define        SAIOHCHECK      (('d'<<8)|3)    /* next i/o checks header & data */
        !           110: #define        SAIONOBAD       (('d'<<8)|4)    /* inhibit bad sector forwarding */
        !           111: #define        SAIODOBAD       (('d'<<8)|5)    /* enable bad sector forwarding */
        !           112: #define        SAIOECCLIM      (('d'<<8)|6)    /* limit ecc correction to 5 bits */
        !           113: #define        SAIOECCUNL      (('d'<<8)|7)    /* use standard ecc procedures */
        !           114: #define        SAIODEVDATA     (('d'<<8)|8)    /* get device data */
        !           115: #define        SAIOSSI         (('d'<<8)|9)    /* set skip sector inhibit */
        !           116: #define        SAIONOSSI       (('d'<<8)|10)   /* inhibit skip sector handling */
        !           117: #define        SAIOSSDEV       (('d'<<8)|11)   /* is device skip sector type? */
        !           118: #define        SAIODEBUG       (('d'<<8)|12)   /* enable/disable debugging */
        !           119: #define        SAIOSEVRE       (('d'<<8)|13)   /* severe burnin, no ECC, no retries */
        !           120: #define        SAIONSEVRE      (('d'<<8)|14)   /* clear severe burnin */
        !           121: 
        !           122: /* codes for sector header word 1 */
        !           123: #define        HDR1_FMT22      0x1000  /* standard 16 bit format */
        !           124: #define        HDR1_OKSCT      0xc000  /* sector ok */
        !           125: #define        HDR1_SSF        0x2000  /* skip sector flag */

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