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1// SPDX-License-Identifier: GPL-2.02/*3 * fs/partitions/atari.c4 *5 * Code extracted from drivers/block/genhd.c6 *7 * Copyright (C) 1991-1998 Linus Torvalds8 * Re-organised Feb 1998 Russell King9 */10 11#include <linux/ctype.h>12#include "check.h"13#include "atari.h"14 15/* ++guenther: this should be settable by the user ("make config")?.16 */17#define ICD_PARTS18 19/* check if a partition entry looks valid -- Atari format is assumed if at20 least one of the primary entries is ok this way */21#define VALID_PARTITION(pi,hdsiz) \22 (((pi)->flg & 1) && \23 isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \24 be32_to_cpu((pi)->st) <= (hdsiz) && \25 be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))26 27static inline int OK_id(char *s)28{29 return memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||30 memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||31 memcmp (s, "RAW", 3) == 0 ;32}33 34int atari_partition(struct parsed_partitions *state)35{36 Sector sect;37 struct rootsector *rs;38 struct partition_info *pi;39 u32 extensect;40 u32 hd_size;41 int slot;42#ifdef ICD_PARTS43 int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */44#endif45 46 /*47 * ATARI partition scheme supports 512 lba only. If this is not48 * the case, bail early to avoid miscalculating hd_size.49 */50 if (queue_logical_block_size(state->disk->queue) != 512)51 return 0;52 53 rs = read_part_sector(state, 0, §);54 if (!rs)55 return -1;56 57 /* Verify this is an Atari rootsector: */58 hd_size = get_capacity(state->disk);59 if (!VALID_PARTITION(&rs->part[0], hd_size) &&60 !VALID_PARTITION(&rs->part[1], hd_size) &&61 !VALID_PARTITION(&rs->part[2], hd_size) &&62 !VALID_PARTITION(&rs->part[3], hd_size)) {63 /*64 * if there's no valid primary partition, assume that no Atari65 * format partition table (there's no reliable magic or the like66 * :-()67 */68 put_dev_sector(sect);69 return 0;70 }71 72 pi = &rs->part[0];73 strlcat(state->pp_buf, " AHDI", PAGE_SIZE);74 for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {75 struct rootsector *xrs;76 Sector sect2;77 ulong partsect;78 79 if ( !(pi->flg & 1) )80 continue;81 /* active partition */82 if (memcmp (pi->id, "XGM", 3) != 0) {83 /* we don't care about other id's */84 put_partition (state, slot, be32_to_cpu(pi->st),85 be32_to_cpu(pi->siz));86 continue;87 }88 /* extension partition */89#ifdef ICD_PARTS90 part_fmt = 1;91#endif92 strlcat(state->pp_buf, " XGM<", PAGE_SIZE);93 partsect = extensect = be32_to_cpu(pi->st);94 while (1) {95 xrs = read_part_sector(state, partsect, §2);96 if (!xrs) {97 printk (" block %ld read failed\n", partsect);98 put_dev_sector(sect);99 return -1;100 }101 102 /* ++roman: sanity check: bit 0 of flg field must be set */103 if (!(xrs->part[0].flg & 1)) {104 printk( "\nFirst sub-partition in extended partition is not valid!\n" );105 put_dev_sector(sect2);106 break;107 }108 109 put_partition(state, slot,110 partsect + be32_to_cpu(xrs->part[0].st),111 be32_to_cpu(xrs->part[0].siz));112 113 if (!(xrs->part[1].flg & 1)) {114 /* end of linked partition list */115 put_dev_sector(sect2);116 break;117 }118 if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {119 printk("\nID of extended partition is not XGM!\n");120 put_dev_sector(sect2);121 break;122 }123 124 partsect = be32_to_cpu(xrs->part[1].st) + extensect;125 put_dev_sector(sect2);126 if (++slot == state->limit) {127 printk( "\nMaximum number of partitions reached!\n" );128 break;129 }130 }131 strlcat(state->pp_buf, " >", PAGE_SIZE);132 }133#ifdef ICD_PARTS134 if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */135 pi = &rs->icdpart[0];136 /* sanity check: no ICD format if first partition invalid */137 if (OK_id(pi->id)) {138 strlcat(state->pp_buf, " ICD<", PAGE_SIZE);139 for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {140 /* accept only GEM,BGM,RAW,LNX,SWP partitions */141 if (!((pi->flg & 1) && OK_id(pi->id)))142 continue;143 put_partition (state, slot,144 be32_to_cpu(pi->st),145 be32_to_cpu(pi->siz));146 }147 strlcat(state->pp_buf, " >", PAGE_SIZE);148 }149 }150#endif151 put_dev_sector(sect);152 153 strlcat(state->pp_buf, "\n", PAGE_SIZE);154 155 return 1;156}157