1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/partitions/mac.c 4 * 5 * Code extracted from drivers/block/genhd.c 6 * Copyright (C) 1991-1998 Linus Torvalds 7 * Re-organised Feb 1998 Russell King 8 */ 9 10 #include <linux/ctype.h> 11 #include "check.h" 12 #include "mac.h" 13 14 #ifdef CONFIG_PPC_PMAC 15 #include <asm/machdep.h> 16 extern void note_bootable_part(dev_t dev, int part, int goodness); 17 #endif 18 19 /* 20 * Code to understand MacOS partition tables. 21 */ 22 23 #ifdef CONFIG_PPC_PMAC 24 static inline void mac_fix_string(char *stg, int len) 25 { 26 int i; 27 28 for (i = len - 1; i >= 0 && stg[i] == ' '; i--) 29 stg[i] = 0; 30 } 31 #endif 32 33 int mac_partition(struct parsed_partitions *state) 34 { 35 Sector sect; 36 unsigned char *data; 37 int slot, blocks_in_map; 38 unsigned secsize, datasize, partoffset; 39 #ifdef CONFIG_PPC_PMAC 40 int found_root = 0; 41 int found_root_goodness = 0; 42 #endif 43 struct mac_partition *part; 44 struct mac_driver_desc *md; 45 46 /* Get 0th block and look at the first partition map entry. */ 47 md = read_part_sector(state, 0, §); 48 if (!md) 49 return -1; 50 if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) { 51 put_dev_sector(sect); 52 return 0; 53 } 54 secsize = be16_to_cpu(md->block_size); 55 put_dev_sector(sect); 56 datasize = round_down(secsize, 512); 57 data = read_part_sector(state, datasize / 512, §); 58 if (!data) 59 return -1; 60 partoffset = secsize % 512; 61 if (partoffset + sizeof(*part) > datasize) 62 return -1; 63 part = (struct mac_partition *) (data + partoffset); 64 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) { 65 put_dev_sector(sect); 66 return 0; /* not a MacOS disk */ 67 } 68 blocks_in_map = be32_to_cpu(part->map_count); 69 if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) { 70 put_dev_sector(sect); 71 return 0; 72 } 73 74 if (blocks_in_map >= state->limit) 75 blocks_in_map = state->limit - 1; 76 77 strlcat(state->pp_buf, " [mac]", PAGE_SIZE); 78 for (slot = 1; slot <= blocks_in_map; ++slot) { 79 int pos = slot * secsize; 80 put_dev_sector(sect); 81 data = read_part_sector(state, pos/512, §); 82 if (!data) 83 return -1; 84 part = (struct mac_partition *) (data + pos%512); 85 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) 86 break; 87 put_partition(state, slot, 88 be32_to_cpu(part->start_block) * (secsize/512), 89 be32_to_cpu(part->block_count) * (secsize/512)); 90 91 if (!strncasecmp(part->type, "Linux_RAID", 10)) 92 state->parts[slot].flags = ADDPART_FLAG_RAID; 93 #ifdef CONFIG_PPC_PMAC 94 /* 95 * If this is the first bootable partition, tell the 96 * setup code, in case it wants to make this the root. 97 */ 98 if (machine_is(powermac)) { 99 int goodness = 0; 100 101 mac_fix_string(part->processor, 16); 102 mac_fix_string(part->name, 32); 103 mac_fix_string(part->type, 32); 104 105 if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE) 106 && strcasecmp(part->processor, "powerpc") == 0) 107 goodness++; 108 109 if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0 110 || (strncasecmp(part->type, "Linux", 5) == 0 111 && strcasecmp(part->type, "Linux_swap") != 0)) { 112 int i, l; 113 114 goodness++; 115 l = strlen(part->name); 116 if (strcmp(part->name, "/") == 0) 117 goodness++; 118 for (i = 0; i <= l - 4; ++i) { 119 if (strncasecmp(part->name + i, "root", 120 4) == 0) { 121 goodness += 2; 122 break; 123 } 124 } 125 if (strncasecmp(part->name, "swap", 4) == 0) 126 goodness--; 127 } 128 129 if (goodness > found_root_goodness) { 130 found_root = slot; 131 found_root_goodness = goodness; 132 } 133 } 134 #endif /* CONFIG_PPC_PMAC */ 135 } 136 #ifdef CONFIG_PPC_PMAC 137 if (found_root_goodness) 138 note_bootable_part(state->disk->part0->bd_dev, found_root, 139 found_root_goodness); 140 #endif 141 142 put_dev_sector(sect); 143 strlcat(state->pp_buf, "\n", PAGE_SIZE); 144 return 1; 145 } 146