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1 | /* |
2 | * efs_vh.h |
3 | * |
4 | * Copyright (c) 1999 Al Smith |
5 | * |
6 | * Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc. |
7 | */ |
8 | |
9 | #ifndef __EFS_VH_H__ |
10 | #define __EFS_VH_H__ |
11 | |
12 | #define VHMAGIC 0xbe5a941 /* volume header magic number */ |
13 | #define NPARTAB 16 /* 16 unix partitions */ |
14 | #define NVDIR 15 /* max of 15 directory entries */ |
15 | #define BFNAMESIZE 16 /* max 16 chars in boot file name */ |
16 | #define VDNAMESIZE 8 |
17 | |
18 | struct volume_directory { |
19 | char vd_name[VDNAMESIZE]; /* name */ |
20 | __be32 vd_lbn; /* logical block number */ |
21 | __be32 vd_nbytes; /* file length in bytes */ |
22 | }; |
23 | |
24 | struct partition_table { /* one per logical partition */ |
25 | __be32 pt_nblks; /* # of logical blks in partition */ |
26 | __be32 pt_firstlbn; /* first lbn of partition */ |
27 | __be32 pt_type; /* use of partition */ |
28 | }; |
29 | |
30 | struct volume_header { |
31 | __be32 vh_magic; /* identifies volume header */ |
32 | __be16 vh_rootpt; /* root partition number */ |
33 | __be16 vh_swappt; /* swap partition number */ |
34 | char vh_bootfile[BFNAMESIZE]; /* name of file to boot */ |
35 | char pad[48]; /* device param space */ |
36 | struct volume_directory vh_vd[NVDIR]; /* other vol hdr contents */ |
37 | struct partition_table vh_pt[NPARTAB]; /* device partition layout */ |
38 | __be32 vh_csum; /* volume header checksum */ |
39 | __be32 vh_fill; /* fill out to 512 bytes */ |
40 | }; |
41 | |
42 | /* partition type sysv is used for EFS format CD-ROM partitions */ |
43 | #define SGI_SYSV 0x05 |
44 | #define SGI_EFS 0x07 |
45 | #define IS_EFS(x) (((x) == SGI_EFS) || ((x) == SGI_SYSV)) |
46 | |
47 | struct pt_types { |
48 | int pt_type; |
49 | char *pt_name; |
50 | }; |
51 | |
52 | #endif /* __EFS_VH_H__ */ |
53 | |
54 |
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