1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * fs/partitions/sysv68.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include "check.h"
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /*
11*4882a593Smuzhiyun * Volume ID structure: on first 256-bytes sector of disk
12*4882a593Smuzhiyun */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun struct volumeid {
15*4882a593Smuzhiyun u8 vid_unused[248];
16*4882a593Smuzhiyun u8 vid_mac[8]; /* ASCII string "MOTOROLA" */
17*4882a593Smuzhiyun };
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /*
20*4882a593Smuzhiyun * config block: second 256-bytes sector on disk
21*4882a593Smuzhiyun */
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun struct dkconfig {
24*4882a593Smuzhiyun u8 ios_unused0[128];
25*4882a593Smuzhiyun __be32 ios_slcblk; /* Slice table block number */
26*4882a593Smuzhiyun __be16 ios_slccnt; /* Number of entries in slice table */
27*4882a593Smuzhiyun u8 ios_unused1[122];
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /*
31*4882a593Smuzhiyun * combined volumeid and dkconfig block
32*4882a593Smuzhiyun */
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun struct dkblk0 {
35*4882a593Smuzhiyun struct volumeid dk_vid;
36*4882a593Smuzhiyun struct dkconfig dk_ios;
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /*
40*4882a593Smuzhiyun * Slice Table Structure
41*4882a593Smuzhiyun */
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun struct slice {
44*4882a593Smuzhiyun __be32 nblocks; /* slice size (in blocks) */
45*4882a593Smuzhiyun __be32 blkoff; /* block offset of slice */
46*4882a593Smuzhiyun };
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun
sysv68_partition(struct parsed_partitions * state)49*4882a593Smuzhiyun int sysv68_partition(struct parsed_partitions *state)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun int i, slices;
52*4882a593Smuzhiyun int slot = 1;
53*4882a593Smuzhiyun Sector sect;
54*4882a593Smuzhiyun unsigned char *data;
55*4882a593Smuzhiyun struct dkblk0 *b;
56*4882a593Smuzhiyun struct slice *slice;
57*4882a593Smuzhiyun char tmp[64];
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun data = read_part_sector(state, 0, §);
60*4882a593Smuzhiyun if (!data)
61*4882a593Smuzhiyun return -1;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun b = (struct dkblk0 *)data;
64*4882a593Smuzhiyun if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
65*4882a593Smuzhiyun put_dev_sector(sect);
66*4882a593Smuzhiyun return 0;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun slices = be16_to_cpu(b->dk_ios.ios_slccnt);
69*4882a593Smuzhiyun i = be32_to_cpu(b->dk_ios.ios_slcblk);
70*4882a593Smuzhiyun put_dev_sector(sect);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun data = read_part_sector(state, i, §);
73*4882a593Smuzhiyun if (!data)
74*4882a593Smuzhiyun return -1;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun slices -= 1; /* last slice is the whole disk */
77*4882a593Smuzhiyun snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices);
78*4882a593Smuzhiyun strlcat(state->pp_buf, tmp, PAGE_SIZE);
79*4882a593Smuzhiyun slice = (struct slice *)data;
80*4882a593Smuzhiyun for (i = 0; i < slices; i++, slice++) {
81*4882a593Smuzhiyun if (slot == state->limit)
82*4882a593Smuzhiyun break;
83*4882a593Smuzhiyun if (be32_to_cpu(slice->nblocks)) {
84*4882a593Smuzhiyun put_partition(state, slot,
85*4882a593Smuzhiyun be32_to_cpu(slice->blkoff),
86*4882a593Smuzhiyun be32_to_cpu(slice->nblocks));
87*4882a593Smuzhiyun snprintf(tmp, sizeof(tmp), "(s%u)", i);
88*4882a593Smuzhiyun strlcat(state->pp_buf, tmp, PAGE_SIZE);
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun slot++;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun strlcat(state->pp_buf, "\n", PAGE_SIZE);
93*4882a593Smuzhiyun put_dev_sector(sect);
94*4882a593Smuzhiyun return 1;
95*4882a593Smuzhiyun }
96