atari.c

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    1 /*
    2  *  fs/partitions/atari.c
    3  *
    4  *  Code extracted from drivers/block/genhd.c
    5  *
    6  *  Copyright (C) 1991-1998  Linus Torvalds
    7  *  Re-organised Feb 1998 Russell King
    8  */
    9 
   10 #include <linux/fs.h>
   11 #include <linux/genhd.h>
   12 #include <linux/kernel.h>
   13 #include <linux/major.h>
   14 #include <linux/string.h>
   15 #include <linux/blk.h>
   16 #include <linux/ctype.h>
   17 
   18 #include <asm/byteorder.h>
   19 #include <asm/system.h>
   20 
   21 #include "check.h"
   22 #include "atari.h"
   23 
   24 /* ++guenther: this should be settable by the user ("make config")?.
   25  */
   26 #define ICD_PARTS
   27 
   28 /* check if a partition entry looks valid -- Atari format is assumed if at
   29    least one of the primary entries is ok this way */
   30 #define VALID_PARTITION(pi,hdsiz)                                            \
   31     (((pi)->flg & 1) &&                                                      \
   32      isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
   33      be32_to_cpu((pi)->st) <= (hdsiz) &&                                     \
   34      be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
   35 
   36 static inline int OK_id(char *s)
   37 {
   38         return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
   39                 memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
   40                 memcmp (s, "RAW", 3) == 0 ;
   41 }
   42 
   43 int atari_partition (struct gendisk *hd, struct block_device *bdev,
   44                      unsigned long first_sector, int minor)
   45 {
   46         int m_lim = minor + hd->max_p;
   47         Sector sect;
   48         struct rootsector *rs;
   49         struct partition_info *pi;
   50         u32 extensect;
   51         u32 hd_size;
   52 #ifdef ICD_PARTS
   53         int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
   54 #endif
   55 
   56         rs = (struct rootsector *) read_dev_sector(bdev, 0, &sect);
   57         if (!rs)
   58                 return -1;
   59 
   60         /* Verify this is an Atari rootsector: */
   61         hd_size = hd->part[minor - 1].nr_sects;
   62         if (!VALID_PARTITION(&rs->part[0], hd_size) &&
   63             !VALID_PARTITION(&rs->part[1], hd_size) &&
   64             !VALID_PARTITION(&rs->part[2], hd_size) &&
   65             !VALID_PARTITION(&rs->part[3], hd_size)) {
   66                 /*
   67                  * if there's no valid primary partition, assume that no Atari
   68                  * format partition table (there's no reliable magic or the like
   69                  * :-()
   70                  */
   71                 put_dev_sector(sect);
   72                 return 0;
   73         }
   74 
   75         pi = &rs->part[0];
   76         printk (" AHDI");
   77         for (; pi < &rs->part[4] && minor < m_lim; minor++, pi++) {
   78                 struct rootsector *xrs;
   79                 Sector sect2;
   80                 ulong partsect;
   81 
   82                 if ( !(pi->flg & 1) )
   83                         continue;
   84                 /* active partition */
   85                 if (memcmp (pi->id, "XGM", 3) != 0) {
   86                         /* we don't care about other id's */
   87                         add_gd_partition (hd, minor, be32_to_cpu(pi->st),
   88                                         be32_to_cpu(pi->siz));
   89                         continue;
   90                 }
   91                 /* extension partition */
   92 #ifdef ICD_PARTS
   93                 part_fmt = 1;
   94 #endif
   95                 printk(" XGM<");
   96                 partsect = extensect = be32_to_cpu(pi->st);
   97                 while (1) {
   98                         xrs = (struct rootsector *)read_dev_sector(bdev, partsect, &sect2);
   99                         if (!xrs) {
  100                                 printk (" block %ld read failed\n", partsect);
  101                                 put_dev_sector(sect);
  102                                 return 0;
  103                         }
  104 
  105                         /* ++roman: sanity check: bit 0 of flg field must be set */
  106                         if (!(xrs->part[0].flg & 1)) {
  107                                 printk( "\nFirst sub-partition in extended partition is not valid!\n" );
  108                                 put_dev_sector(sect2);
  109                                 break;
  110                         }
  111 
  112                         add_gd_partition(hd, minor,
  113                                    partsect + be32_to_cpu(xrs->part[0].st),
  114                                    be32_to_cpu(xrs->part[0].siz));
  115 
  116                         if (!(xrs->part[1].flg & 1)) {
  117                                 /* end of linked partition list */
  118                                 put_dev_sector(sect2);
  119                                 break;
  120                         }
  121                         if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
  122                                 printk("\nID of extended partition is not XGM!\n");
  123                                 put_dev_sector(sect2);
  124                                 break;
  125                         }
  126 
  127                         partsect = be32_to_cpu(xrs->part[1].st) + extensect;
  128                         put_dev_sector(sect2);
  129                         minor++;
  130                         if (minor >= m_lim) {
  131                                 printk( "\nMaximum number of partitions reached!\n" );
  132                                 break;
  133                         }
  134                 }
  135                 printk(" >");
  136         }
  137 #ifdef ICD_PARTS
  138         if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
  139                 pi = &rs->icdpart[0];
  140                 /* sanity check: no ICD format if first partition invalid */
  141                 if (OK_id(pi->id)) {
  142                         printk(" ICD<");
  143                         for (; pi < &rs->icdpart[8] && minor < m_lim; minor++, pi++) {
  144                                 /* accept only GEM,BGM,RAW,LNX,SWP partitions */
  145                                 if (!((pi->flg & 1) && OK_id(pi->id)))
  146                                         continue;
  147                                 part_fmt = 2;
  148                                 add_gd_partition (hd, minor,
  149                                                 be32_to_cpu(pi->st),
  150                                                 be32_to_cpu(pi->siz));
  151                         }
  152                         printk(" >");
  153                 }
  154         }
  155 #endif
  156         put_dev_sector(sect);
  157 
  158         printk ("\n");
  159 
  160         return 1;
  161 }
  162

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FreeBSD/Linux Kernel Cross Reference sys/fs/partitions/atari.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/partitions/atari.c