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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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