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Annotation of 43BSDTahoe/sys/mdec/rdboot.c, revision 1.1

1.1     ! root        1: /*
        !             2: **     @(#)rdboot.c    7.1 (Berkeley) 1/22/88
        !             3: */
        !             4: 
        !             5: /*
        !             6: ** This is a VMB boot block for microvax.  For more info, see
        !             7: ** the KA-630 User's manual.
        !             8: */
        !             9: 
        !            10: /*
        !            11: **          ---------------------------------------------------
        !            12: ** BB + 0: |      1     |      N     |      any value          |
        !            13: **          ---------------------------------------------------
        !            14: */
        !            15: xxx:   .long   0x001040000
        !            16: /*
        !            17: **          ---------------------------------------------------
        !            18: **      4: |        low  lbn         |      high lbn           |
        !            19: **          ---------------------------------------------------
        !            20: */
        !            21:        .long   0x000010000
        !            22: /*
        !            23: ** BB + 2*N
        !            24: **          ---------------------------------------------------
        !            25: **    + 0: | check byte |      K     |     0     |   18 (HEX)  |
        !            26: **          ---------------------------------------------------
        !            27: */
        !            28:        .long   0x0e7000018
        !            29: /*
        !            30: **          ---------------------------------------------------
        !            31: **    + 4: |     any  value          |  1 or 81  |      0      |
        !            32: **          ---------------------------------------------------
        !            33: */
        !            34:        .long   0x000008100
        !            35: /*
        !            36: **          ---------------------------------------------------
        !            37: **    + 8: |     size in blocks of the image                   |
        !            38: **          ---------------------------------------------------
        !            39: */
        !            40:        .long   0x00000000f
        !            41: /*
        !            42: **          ---------------------------------------------------
        !            43: **    +12: |     load offset from default load address         |
        !            44: **          ---------------------------------------------------
        !            45: */
        !            46:        .long   0x000000000
        !            47: /*
        !            48: **          ---------------------------------------------------
        !            49: **    +16: |     offset into image to start execution          |
        !            50: **          ---------------------------------------------------
        !            51: */
        !            52:        .long   0x000000002
        !            53: /*
        !            54: **          ---------------------------------------------------
        !            55: **    +20: |     sum of previous three longwords               |
        !            56: **          ---------------------------------------------------
        !            57: */
        !            58:        .long   0x000000011
        !            59: /*
        !            60: **
        !            61: ** BB +0:      These two bytes can have any value
        !            62: **
        !            63: ** BB+2:       This value is the word offset from the start of the
        !            64: **             bootblock to the identification area described below.
        !            65: **
        !            66: ** BB+3:       This byte must be one.
        !            67: **
        !            68: ** BB+4:       This longword contains the logical block number
        !            69: **             (word swapped) of the secondary image.
        !            70: **
        !            71: ** BB+(2*n)+0: This byte defines the expected instruction set.
        !            72: **             18(hex) means VAX.
        !            73: **
        !            74: ** BB+(2*n)+1: This byte defines the expected controller type, 0
        !            75: **             means unknown.
        !            76: **
        !            77: ** BB+(2*n)+2: This byte defines the file structure on the volume,
        !            78: **             it may be any value.
        !            79: **
        !            80: ** BB+(2*n)+3: This byte must be the ones complement of the sum of
        !            81: **             the previous three bytes.
        !            82: **
        !            83: ** BB+(2*n)+4: This byte must be zero.
        !            84: **
        !            85: ** BB+(2*n)+5: This byte must be 1 or 81 (hex).  This byte defines
        !            86: **             the version number of the format standard and the
        !            87: **             type of disk.  The version is one, the high bit is 0
        !            88: **             for single sided, 1 for double sided.
        !            89: **
        !            90: ** BB+(2*n)+6: These two bytes may be any value, but generally they
        !            91: **             are zero.
        !            92: **
        !            93: ** BB+(2*n)+8: This entry is a longword containing the size in
        !            94: **             blocks of the secondary bootstrap image.
        !            95: **
        !            96: ** BB+(2*n)+12:        This entry is a longword containing a load offset
        !            97: **             (usually zero) from the default load address of the
        !            98: **             secondary bootstrap.
        !            99: **
        !           100: ** BB+(2*n)+16:        This entry is a longword containing the byte offset
        !           101: **             into the secondary bootstrap where execution is to
        !           102: **             begin.
        !           103: **
        !           104: ** BB+(2*n)+20:        This entry is a longword containing the sum of the
        !           105: **             previous three longwords.
        !           106: */

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