disk/part_iso.c

   1 /*
   2  * (C) Copyright 2001
   3  * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include "part_iso.h"
  11
  12 #ifdef HAVE_BLOCK_DEVICE
  13
  14 /* #define      ISO_PART_DEBUG */
  15
  16 #ifdef  ISO_PART_DEBUG
  17 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  18 #else
  19 #define PRINTF(fmt,args...)
  20 #endif
  21
  22 /* enable this if CDs are written with the PowerPC Platform ID */
  23 #undef CHECK_FOR_POWERPC_PLATTFORM
  24 #define CD_SECTSIZE 2048
  25
  26 static unsigned char tmpbuf[CD_SECTSIZE];
  27
  28 /* Convert char[4] in little endian format to the host format integer
  29  */
  30 static inline unsigned long le32_to_int(unsigned char *le32)
  31 {
  32     return ((le32[3] << 24) +
  33             (le32[2] << 16) +
  34             (le32[1] << 8) +
  35              le32[0]
  36            );
  37 }
  38 /* Convert char[2] in little endian format to the host format integer
  39  */
  40 static inline unsigned short le16_to_int(unsigned char *le16)
  41 {
  42     return ((le16[1] << 8) +
  43            le16[0]
  44            );
  45 }
  46
  47
  48 /* only boot records will be listed as valid partitions */
  49 int get_partition_info_iso_verb(struct blk_desc *dev_desc, int part_num,
  50                                 disk_partition_t *info, int verb)
  51 {
  52         int i,offset,entry_num;
  53         unsigned short *chksumbuf;
  54         unsigned short chksum;
  55         unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
  56         iso_boot_rec_t *pbr = (iso_boot_rec_t   *)tmpbuf; /* boot record */
  57         iso_pri_rec_t *ppr = (iso_pri_rec_t     *)tmpbuf;       /* primary desc */
  58         iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
  59         iso_init_def_entry_t *pide;
  60
  61         if (dev_desc->blksz != CD_SECTSIZE)
  62                 return -1;
  63
  64         /* the first sector (sector 0x10) must be a primary volume desc */
  65         blkaddr=PVD_OFFSET;
  66         if (dev_desc->block_read(dev_desc, PVD_OFFSET, 1, (ulong *)tmpbuf) != 1)
  67                 return -1;
  68         if(ppr->desctype!=0x01) {
  69                 if(verb)
  70                         printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
  71                                 dev_desc->dev, part_num);
  72                 return (-1);
  73         }
  74         if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
  75                 if(verb)
  76                         printf ("** Wrong ISO Ident: %s on %d:%d **\n",
  77                                 ppr->stand_ident,dev_desc->dev, part_num);
  78                 return (-1);
  79         }
  80         lastsect= ((ppr->firstsek_LEpathtab1_LE & 0x000000ff)<<24) +
  81                   ((ppr->firstsek_LEpathtab1_LE & 0x0000ff00)<< 8) +
  82                   ((ppr->firstsek_LEpathtab1_LE & 0x00ff0000)>> 8) +
  83                   ((ppr->firstsek_LEpathtab1_LE & 0xff000000)>>24) ;
  84         info->blksz=ppr->secsize_BE; /* assuming same block size for all entries */
  85         PRINTF(" Lastsect:%08lx\n",lastsect);
  86         for(i=blkaddr;i<lastsect;i++) {
  87                 PRINTF("Reading block %d\n", i);
  88                 if (dev_desc->block_read(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
  89                         return -1;
  90                 if(ppr->desctype==0x00)
  91                         break; /* boot entry found */
  92                 if(ppr->desctype==0xff) {
  93                         if(verb)
  94                                 printf ("** No valid boot catalog found on %d:%d **\n",
  95                                         dev_desc->dev, part_num);
  96                         return (-1);
  97                 }
  98         }
  99         /* boot entry found */
 100         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
 101                 if(verb)
 102                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
 103                                 pbr->ident_str,dev_desc->dev, part_num);
 104                 return (-1);
 105         }
 106         bootaddr=le32_to_int(pbr->pointer);
 107         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
 108         if (dev_desc->block_read(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
 109                 if(verb)
 110                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
 111                                 bootaddr,dev_desc->dev, part_num);
 112                 return (-1);
 113         }
 114         chksum=0;
 115         chksumbuf = (unsigned short *)tmpbuf;
 116         for(i=0;i<0x10;i++)
 117                 chksum+=((chksumbuf[i] &0xff)<<8)+((chksumbuf[i] &0xff00)>>8);
 118         if(chksum!=0) {
 119                 if(verb)
 120                         printf ("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 121                                 dev_desc->dev, part_num);
 122                 return (-1);
 123         }
 124         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 125                 if(verb)
 126                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 127                                 dev_desc->dev, part_num);
 128                 return(-1);
 129         }
 130 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 131         if(pve->platform!=0x01) {
 132                 if(verb)
 133                         printf ("** No PowerPC platform CD on %d:%d **\n",
 134                                 dev_desc->dev, part_num);
 135                 return(-1);
 136         }
 137 #endif
 138         /* the validation entry seems to be ok, now search the "partition" */
 139         entry_num=0;
 140         offset=0x20;
 141         strcpy((char *)info->type, "U-Boot");
 142         switch(dev_desc->if_type) {
 143                 case IF_TYPE_IDE:
 144                 case IF_TYPE_SATA:
 145                 case IF_TYPE_ATAPI:
 146                         sprintf ((char *)info->name, "hd%c%d",
 147                                 'a' + dev_desc->dev, part_num);
 148                         break;
 149                 case IF_TYPE_SCSI:
 150                         sprintf ((char *)info->name, "sd%c%d",
 151                                 'a' + dev_desc->dev, part_num);
 152                         break;
 153                 case IF_TYPE_USB:
 154                         sprintf ((char *)info->name, "usbd%c%d",
 155                                 'a' + dev_desc->dev, part_num);
 156                         break;
 157                 case IF_TYPE_DOC:
 158                         sprintf ((char *)info->name, "docd%c%d",
 159                                 'a' + dev_desc->dev, part_num);
 160                         break;
 161                 default:
 162                         sprintf ((char *)info->name, "xx%c%d",
 163                                 'a' + dev_desc->dev, part_num);
 164                         break;
 165         }
 166         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 167          * (63 boot entries + validation entry) */
 168          while(offset<2048) {
 169                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 170                 if ((pide->boot_ind==0x88) ||
 171                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 172                         if(entry_num==part_num) { /* part found */
 173                                 goto found;
 174                         }
 175                         entry_num++; /* count partitions Entries (boot and non bootables */
 176                         offset+=0x20;
 177                         continue;
 178                 }
 179                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 180                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 181                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 182                         offset+=0x20; /* skip unused entries */
 183                 }
 184                 else {
 185                         if(verb)
 186                                 printf ("** Partition %d not found on device %d **\n",
 187                                         part_num,dev_desc->dev);
 188                         return(-1);
 189                 }
 190         }
 191         /* if we reach this point entire sector has been
 192          * searched w/o succsess */
 193         if(verb)
 194                 printf ("** Partition %d not found on device %d **\n",
 195                         part_num,dev_desc->dev);
 196         return(-1);
 197 found:
 198         if(pide->boot_ind!=0x88) {
 199                 if(verb)
 200                         printf ("** Partition %d is not bootable on device %d **\n",
 201                                 part_num,dev_desc->dev);
 202                 return (-1);
 203         }
 204         switch(pide->boot_media) {
 205                 case 0x00: /* no emulation */
 206                         info->size=le16_to_int(pide->sec_cnt)>>2;
 207                         break;
 208                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 209                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 210                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 211                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 212                 default:        info->size=0; break;
 213         }
 214         newblkaddr=le32_to_int(pide->rel_block_addr);
 215         info->start=newblkaddr;
 216         PRINTF(" part %d found @ %lx size %lx\n",part_num,newblkaddr,info->size);
 217         return 0;
 218 }
 219
 220 int get_partition_info_iso(struct blk_desc *dev_desc, int part_num,
 221                            disk_partition_t *info)
 222 {
 223         return(get_partition_info_iso_verb(dev_desc, part_num, info, 1));
 224 }
 225
 226
 227 void print_part_iso(struct blk_desc *dev_desc)
 228 {
 229         disk_partition_t info;
 230         int i;
 231         if(get_partition_info_iso_verb(dev_desc,0,&info,0)==-1) {
 232                 printf("** No boot partition found on device %d **\n",dev_desc->dev);
 233                 return;
 234         }
 235         printf("Part   Start     Sect x Size Type\n");
 236         i=0;
 237         do {
 238                 printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 239                        i, info.start, info.size, info.blksz, info.type);
 240                 i++;
 241         } while (get_partition_info_iso_verb(dev_desc,i,&info,0)!=-1);
 242 }
 243
 244 int test_part_iso(struct blk_desc *dev_desc)
 245 {
 246         disk_partition_t info;
 247
 248         return(get_partition_info_iso_verb(dev_desc,0,&info,0));
 249 }
 250
 251 #endif