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 57 /* 58 * If the "block size" is not a power of 2, things get weird - we might 59 * end up with a partition straddling a sector boundary, so we wouldn't 60 * be able to read a partition entry with read_part_sector(). 61 * Real block sizes are probably (?) powers of two, so just require 62 * that. 63 */ 64 if (!is_power_of_2(secsize)) 65 return -1; 66 datasize = round_down(secsize, 512); 67 data = read_part_sector(state, datasize / 512, §); 68 if (!data) 69 return -1; 70 partoffset = secsize % 512; 71 if (partoffset + sizeof(*part) > datasize) { 72 put_dev_sector(sect); 73 return -1; 74 } 75 part = (struct mac_partition *) (data + partoffset); 76 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) { 77 put_dev_sector(sect); 78 return 0; /* not a MacOS disk */ 79 } 80 blocks_in_map = be32_to_cpu(part->map_count); 81 if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) { 82 put_dev_sector(sect); 83 return 0; 84 } 85 86 if (blocks_in_map >= state->limit) 87 blocks_in_map = state->limit - 1; 88 89 strlcat(state->pp_buf, " [mac]", PAGE_SIZE); 90 for (slot = 1; slot <= blocks_in_map; ++slot) { 91 int pos = slot * secsize; 92 put_dev_sector(sect); 93 data = read_part_sector(state, pos/512, §); 94 if (!data) 95 return -1; 96 part = (struct mac_partition *) (data + pos%512); 97 if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) 98 break; 99 put_partition(state, slot, 100 be32_to_cpu(part->start_block) * (secsize/512), 101 be32_to_cpu(part->block_count) * (secsize/512)); 102 103 if (!strncasecmp(part->type, "Linux_RAID", 10)) 104 state->parts[slot].flags = ADDPART_FLAG_RAID; 105 #ifdef CONFIG_PPC_PMAC 106 /* 107 * If this is the first bootable partition, tell the 108 * setup code, in case it wants to make this the root. 109 */ 110 if (machine_is(powermac)) { 111 int goodness = 0; 112 113 mac_fix_string(part->processor, 16); 114 mac_fix_string(part->name, 32); 115 mac_fix_string(part->type, 32); 116 117 if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE) 118 && strcasecmp(part->processor, "powerpc") == 0) 119 goodness++; 120 121 if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0 122 || (strncasecmp(part->type, "Linux", 5) == 0 123 && strcasecmp(part->type, "Linux_swap") != 0)) { 124 int i, l; 125 126 goodness++; 127 l = strnlen(part->name, sizeof(part->name)); 128 if (strncmp(part->name, "/", sizeof(part->name)) == 0) 129 goodness++; 130 for (i = 0; i <= l - 4; ++i) { 131 if (strncasecmp(part->name + i, "root", 132 4) == 0) { 133 goodness += 2; 134 break; 135 } 136 } 137 if (strncasecmp(part->name, "swap", 4) == 0) 138 goodness--; 139 } 140 141 if (goodness > found_root_goodness) { 142 found_root = slot; 143 found_root_goodness = goodness; 144 } 145 } 146 #endif /* CONFIG_PPC_PMAC */ 147 } 148 #ifdef CONFIG_PPC_PMAC 149 if (found_root_goodness) 150 note_bootable_part(state->disk->part0->bd_dev, found_root, 151 found_root_goodness); 152 #endif 153 154 put_dev_sector(sect); 155 strlcat(state->pp_buf, "\n", PAGE_SIZE); 156 return 1; 157 } 158