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1// SPDX-License-Identifier: GPL-2.02/*3 * fs/partitions/mac.c4 *5 * Code extracted from drivers/block/genhd.c6 * Copyright (C) 1991-1998 Linus Torvalds7 * Re-organised Feb 1998 Russell King8 */9 10#include <linux/ctype.h>11#include "check.h"12#include "mac.h"13 14#ifdef CONFIG_PPC_PMAC15#include <asm/machdep.h>16extern void note_bootable_part(dev_t dev, int part, int goodness);17#endif18 19/*20 * Code to understand MacOS partition tables.21 */22 23#ifdef CONFIG_PPC_PMAC24static 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#endif32 33int 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_PMAC40 int found_root = 0;41 int found_root_goodness = 0;42#endif43 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_PMAC94 /*95 * If this is the first bootable partition, tell the96 * 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") == 0110 || (strncasecmp(part->type, "Linux", 5) == 0111 && 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_PMAC137 if (found_root_goodness)138 note_bootable_part(state->disk->part0->bd_dev, found_root,139 found_root_goodness);140#endif141 142 put_dev_sector(sect);143 strlcat(state->pp_buf, "\n", PAGE_SIZE);144 return 1;145}146