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