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Annotation of Net2/arch/hp300/dev/cdvar.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Systems Programming Group of the University of Utah Computer
        !             8:  * Science Department.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
        !            39:  *
        !            40:  *     @(#)cdvar.h     7.2 (Berkeley) 11/4/90
        !            41:  */
        !            42: 
        !            43: #define        NCDISKS 8                       /* max # of component disks */
        !            44: 
        !            45: /*
        !            46:  * A concatenated disk is described at config time by this structure.
        !            47:  */
        !            48: struct cddevice {
        !            49:        int     cd_unit;                /* logical unit of this cd */
        !            50:        int     cd_interleave;          /* interleave (DEV_BSIZE blocks) */
        !            51:        int     cd_flags;               /* misc. information */
        !            52:        int     cd_dk;                  /* disk number */
        !            53:        dev_t   cd_dev[NCDISKS];        /* component devices */
        !            54: };
        !            55: 
        !            56: /* cd_flags */
        !            57: #define        CDF_SWAP        0x01    /* interleave should be dmmax */
        !            58: #define CDF_UNIFORM    0x02    /* use LCD of sizes for uniform interleave */
        !            59: 
        !            60: /*
        !            61:  * Component info table.
        !            62:  * Describes a single component of a concatenated disk.
        !            63:  */
        !            64: struct cdcinfo {
        !            65:        dev_t           ci_dev;  /* devno */
        !            66:        size_t          ci_size; /* size */
        !            67: };
        !            68: 
        !            69: /*
        !            70:  * Interleave description table.
        !            71:  * Computed at boot time to speed irregular-interleave lookups.
        !            72:  * The idea is that we interleave in "groups".  First we interleave
        !            73:  * evenly over all component disks up to the size of the smallest
        !            74:  * component (the first group), then we interleave evenly over all
        !            75:  * remaining disks up to the size of the next-smallest (second group),
        !            76:  * and so on.
        !            77:  *
        !            78:  * Each table entry describes the interleave characteristics of one
        !            79:  * of these groups.  For example if a concatenated disk consisted of
        !            80:  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
        !            81:  * DEV_BSIZE (1), the table would have three entries:
        !            82:  *
        !            83:  *     ndisk   startblk        startoff        dev
        !            84:  *     3       0               0               0, 1, 2
        !            85:  *     2       9               3               0, 2
        !            86:  *     1       13              5               2
        !            87:  *     0       -               -               -
        !            88:  *
        !            89:  * which says that the first nine blocks (0-8) are interleaved over
        !            90:  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
        !            91:  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
        !            92:  * at component block 3, and the remaining blocks (13-14) are on disk
        !            93:  * 2 starting at offset 5.
        !            94:  */
        !            95: struct cdiinfo {
        !            96:        int     ii_ndisk;       /* # of disks range is interleaved over */
        !            97:        daddr_t ii_startblk;    /* starting scaled block # for range */
        !            98:        daddr_t ii_startoff;    /* starting component offset (block #) */
        !            99:        char    ii_index[NCDISKS];/* ordered list of components in range */
        !           100: };
        !           101: 
        !           102: #ifdef KERNEL
        !           103: extern struct cddevice cddevice[];
        !           104: #endif

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