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