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 <asm/unaligned.h>
  11 #include "part_iso.h"
  12
  13 #ifdef HAVE_BLOCK_DEVICE
  14
  15 /* #define      ISO_PART_DEBUG */
  16
  17 #ifdef  ISO_PART_DEBUG
  18 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  19 #else
  20 #define PRINTF(fmt,args...)
  21 #endif
  22
  23 /* enable this if CDs are written with the PowerPC Platform ID */
  24 #undef CHECK_FOR_POWERPC_PLATTFORM
  25 #define CD_SECTSIZE 2048
  26
  27 static unsigned char tmpbuf[CD_SECTSIZE];
  28
  29 /* only boot records will be listed as valid partitions */
  30 int part_get_info_iso_verb(struct blk_desc *dev_desc, int part_num,
  31                            disk_partition_t *info, int verb)
  32 {
  33         int i,offset,entry_num;
  34         unsigned short *chksumbuf;
  35         unsigned short chksum;
  36         unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
  37         iso_boot_rec_t *pbr = (iso_boot_rec_t   *)tmpbuf; /* boot record */
  38         iso_pri_rec_t *ppr = (iso_pri_rec_t     *)tmpbuf;       /* primary desc */
  39         iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
  40         iso_init_def_entry_t *pide;
  41
  42         if (dev_desc->blksz != CD_SECTSIZE)
  43                 return -1;
  44
  45         /* the first sector (sector 0x10) must be a primary volume desc */
  46         blkaddr=PVD_OFFSET;
  47         if (blk_dread(dev_desc, PVD_OFFSET, 1, (ulong *)tmpbuf) != 1)
  48                 return -1;
  49         if(ppr->desctype!=0x01) {
  50                 if(verb)
  51                         printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
  52                                 dev_desc->devnum, part_num);
  53                 return (-1);
  54         }
  55         if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
  56                 if(verb)
  57                         printf ("** Wrong ISO Ident: %s on %d:%d **\n",
  58                                 ppr->stand_ident, dev_desc->devnum, part_num);
  59                 return (-1);
  60         }
  61         lastsect = le32_to_cpu(ppr->firstsek_LEpathtab1_LE);
  62         /* assuming same block size for all entries */
  63         info->blksz = be16_to_cpu(ppr->secsize_BE);
  64         PRINTF(" Lastsect:%08lx\n",lastsect);
  65         for(i=blkaddr;i<lastsect;i++) {
  66                 PRINTF("Reading block %d\n", i);
  67                 if (blk_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
  68                         return -1;
  69                 if(ppr->desctype==0x00)
  70                         break; /* boot entry found */
  71                 if(ppr->desctype==0xff) {
  72                         if(verb)
  73                                 printf ("** No valid boot catalog found on %d:%d **\n",
  74                                         dev_desc->devnum, part_num);
  75                         return (-1);
  76                 }
  77         }
  78         /* boot entry found */
  79         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
  80                 if(verb)
  81                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
  82                                 pbr->ident_str, dev_desc->devnum, part_num);
  83                 return (-1);
  84         }
  85         bootaddr = get_unaligned_le32(pbr->pointer);
  86         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
  87         if (blk_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
  88                 if(verb)
  89                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
  90                                 bootaddr, dev_desc->devnum, part_num);
  91                 return (-1);
  92         }
  93         chksum=0;
  94         chksumbuf = (unsigned short *)tmpbuf;
  95         for(i=0;i<0x10;i++)
  96                 chksum += le16_to_cpu(chksumbuf[i]);
  97         if(chksum!=0) {
  98                 if(verb)
  99                         printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 100                                dev_desc->devnum, part_num);
 101                 return (-1);
 102         }
 103         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 104                 if(verb)
 105                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 106                                 dev_desc->devnum, part_num);
 107                 return(-1);
 108         }
 109 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 110         if(pve->platform!=0x01) {
 111                 if(verb)
 112                         printf ("** No PowerPC platform CD on %d:%d **\n",
 113                                 dev_desc->devnum, part_num);
 114                 return(-1);
 115         }
 116 #endif
 117         /* the validation entry seems to be ok, now search the "partition" */
 118         entry_num=1;
 119         offset=0x20;
 120         strcpy((char *)info->type, "U-Boot");
 121         switch(dev_desc->if_type) {
 122                 case IF_TYPE_IDE:
 123                 case IF_TYPE_SATA:
 124                 case IF_TYPE_ATAPI:
 125                         sprintf ((char *)info->name, "hd%c%d",
 126                                 'a' + dev_desc->devnum, part_num);
 127                         break;
 128                 case IF_TYPE_SCSI:
 129                         sprintf ((char *)info->name, "sd%c%d",
 130                                 'a' + dev_desc->devnum, part_num);
 131                         break;
 132                 case IF_TYPE_USB:
 133                         sprintf ((char *)info->name, "usbd%c%d",
 134                                 'a' + dev_desc->devnum, part_num);
 135                         break;
 136                 case IF_TYPE_DOC:
 137                         sprintf ((char *)info->name, "docd%c%d",
 138                                 'a' + dev_desc->devnum, part_num);
 139                         break;
 140                 default:
 141                         sprintf ((char *)info->name, "xx%c%d",
 142                                 'a' + dev_desc->devnum, part_num);
 143                         break;
 144         }
 145         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 146          * (63 boot entries + validation entry) */
 147          while(offset<2048) {
 148                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 149                 if ((pide->boot_ind==0x88) ||
 150                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 151                         if(entry_num==part_num) { /* part found */
 152                                 goto found;
 153                         }
 154                         entry_num++; /* count partitions Entries (boot and non bootables */
 155                         offset+=0x20;
 156                         continue;
 157                 }
 158                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 159                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 160                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 161                         offset+=0x20; /* skip unused entries */
 162                 }
 163                 else {
 164                         if(verb)
 165                                 printf ("** Partition %d not found on device %d **\n",
 166                                         part_num, dev_desc->devnum);
 167                         return(-1);
 168                 }
 169         }
 170         /* if we reach this point entire sector has been
 171          * searched w/o succsess */
 172         if(verb)
 173                 printf ("** Partition %d not found on device %d **\n",
 174                         part_num, dev_desc->devnum);
 175         return(-1);
 176 found:
 177         if(pide->boot_ind!=0x88) {
 178                 if(verb)
 179                         printf("** Partition %d is not bootable on device %d **\n",
 180                                part_num, dev_desc->devnum);
 181                 return (-1);
 182         }
 183         switch(pide->boot_media) {
 184                 case 0x00: /* no emulation */
 185                         info->size = get_unaligned_le16(pide->sec_cnt)>>2;
 186                         break;
 187                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 188                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 189                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 190                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 191                 default:        info->size=0; break;
 192         }
 193         newblkaddr = get_unaligned_le32(pide->rel_block_addr);
 194         info->start=newblkaddr;
 195         PRINTF(" part %d found @ %lx size %lx\n",part_num,newblkaddr,info->size);
 196         return 0;
 197 }
 198
 199 static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
 200                                   disk_partition_t *info)
 201 {
 202         return part_get_info_iso_verb(dev_desc, part_num, info, 1);
 203 }
 204
 205 static void part_print_iso(struct blk_desc *dev_desc)
 206 {
 207         disk_partition_t info;
 208         int i;
 209
 210         if (part_get_info_iso_verb(dev_desc, 0, &info, 0) == -1) {
 211                 printf("** No boot partition found on device %d **\n",
 212                        dev_desc->devnum);
 213                 return;
 214         }
 215         printf("Part   Start     Sect x Size Type\n");
 216         i=0;
 217         do {
 218                 printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 219                        i, info.start, info.size, info.blksz, info.type);
 220                 i++;
 221         } while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
 222 }
 223
 224 static int part_test_iso(struct blk_desc *dev_desc)
 225 {
 226         disk_partition_t info;
 227
 228         return part_get_info_iso_verb(dev_desc, 1, &info, 1);
 229 }
 230
 231 U_BOOT_PART_TYPE(iso) = {
 232         .name           = "ISO",
 233         .part_type      = PART_TYPE_ISO,
 234         .get_info       = part_get_info_iso,
 235         .print          = part_print_iso,
 236         .test           = part_test_iso,
 237 };
 238 #endif