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 unsigned long iso_dread(struct blk_desc *block_dev, lbaint_t start,
  30                         lbaint_t blkcnt, void *buffer)
  31 {
  32         unsigned long ret;
  33
  34         if (block_dev->blksz == 512) {
  35                 /* Convert from 2048 to 512 sector size */
  36                 start *= 4;
  37                 blkcnt *= 4;
  38         }
  39
  40         ret = blk_dread(block_dev, start, blkcnt, buffer);
  41
  42         if (block_dev->blksz == 512)
  43                 ret /= 4;
  44
  45         return ret;
  46 }
  47
  48 /* only boot records will be listed as valid partitions */
  49 int part_get_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) && (dev_desc->blksz != 512))
  62                 return -1;
  63
  64         /* the first sector (sector 0x10) must be a primary volume desc */
  65         blkaddr=PVD_OFFSET;
  66         if (iso_dread(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->devnum, 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->devnum, part_num);
  78                 return (-1);
  79         }
  80         lastsect = le32_to_cpu(ppr->firstsek_LEpathtab1_LE);
  81         /* assuming same block size for all entries */
  82         info->blksz = be16_to_cpu(ppr->secsize_BE);
  83         PRINTF(" Lastsect:%08lx\n",lastsect);
  84         for(i=blkaddr;i<lastsect;i++) {
  85                 PRINTF("Reading block %d\n", i);
  86                 if (iso_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
  87                         return -1;
  88                 if(ppr->desctype==0x00)
  89                         break; /* boot entry found */
  90                 if(ppr->desctype==0xff) {
  91                         if(verb)
  92                                 printf ("** No valid boot catalog found on %d:%d **\n",
  93                                         dev_desc->devnum, part_num);
  94                         return (-1);
  95                 }
  96         }
  97         /* boot entry found */
  98         if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
  99                 if(verb)
 100                         printf ("** Wrong El Torito ident: %s on %d:%d **\n",
 101                                 pbr->ident_str, dev_desc->devnum, part_num);
 102                 return (-1);
 103         }
 104         bootaddr = get_unaligned_le32(pbr->pointer);
 105         PRINTF(" Boot Entry at: %08lX\n",bootaddr);
 106         if (iso_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
 107                 if(verb)
 108                         printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
 109                                 bootaddr, dev_desc->devnum, part_num);
 110                 return (-1);
 111         }
 112         chksum=0;
 113         chksumbuf = (unsigned short *)tmpbuf;
 114         for(i=0;i<0x10;i++)
 115                 chksum += le16_to_cpu(chksumbuf[i]);
 116         if(chksum!=0) {
 117                 if(verb)
 118                         printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
 119                                dev_desc->devnum, part_num);
 120                 return (-1);
 121         }
 122         if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
 123                 if(verb)
 124                         printf ("** Key 0x55 0xAA error on %d:%d **\n",
 125                                 dev_desc->devnum, part_num);
 126                 return(-1);
 127         }
 128 #ifdef CHECK_FOR_POWERPC_PLATTFORM
 129         if(pve->platform!=0x01) {
 130                 if(verb)
 131                         printf ("** No PowerPC platform CD on %d:%d **\n",
 132                                 dev_desc->devnum, part_num);
 133                 return(-1);
 134         }
 135 #endif
 136         /* the validation entry seems to be ok, now search the "partition" */
 137         entry_num=1;
 138         offset=0x20;
 139         strcpy((char *)info->type, "U-Boot");
 140         switch(dev_desc->if_type) {
 141                 case IF_TYPE_IDE:
 142                 case IF_TYPE_SATA:
 143                 case IF_TYPE_ATAPI:
 144                         sprintf ((char *)info->name, "hd%c%d",
 145                                 'a' + dev_desc->devnum, part_num);
 146                         break;
 147                 case IF_TYPE_SCSI:
 148                         sprintf ((char *)info->name, "sd%c%d",
 149                                 'a' + dev_desc->devnum, part_num);
 150                         break;
 151                 case IF_TYPE_USB:
 152                         sprintf ((char *)info->name, "usbd%c%d",
 153                                 'a' + dev_desc->devnum, part_num);
 154                         break;
 155                 case IF_TYPE_DOC:
 156                         sprintf ((char *)info->name, "docd%c%d",
 157                                 'a' + dev_desc->devnum, part_num);
 158                         break;
 159                 default:
 160                         sprintf ((char *)info->name, "xx%c%d",
 161                                 'a' + dev_desc->devnum, part_num);
 162                         break;
 163         }
 164         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 165          * (63 boot entries + validation entry) */
 166          while(offset<2048) {
 167                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 168                 if ((pide->boot_ind==0x88) ||
 169                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 170                         if(entry_num==part_num) { /* part found */
 171                                 goto found;
 172                         }
 173                         entry_num++; /* count partitions Entries (boot and non bootables */
 174                         offset+=0x20;
 175                         continue;
 176                 }
 177                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 178                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 179                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 180                         offset+=0x20; /* skip unused entries */
 181                 }
 182                 else {
 183                         if(verb)
 184                                 printf ("** Partition %d not found on device %d **\n",
 185                                         part_num, dev_desc->devnum);
 186                         return(-1);
 187                 }
 188         }
 189         /* if we reach this point entire sector has been
 190          * searched w/o succsess */
 191         if(verb)
 192                 printf ("** Partition %d not found on device %d **\n",
 193                         part_num, dev_desc->devnum);
 194         return(-1);
 195 found:
 196         if(pide->boot_ind!=0x88) {
 197                 if(verb)
 198                         printf("** Partition %d is not bootable on device %d **\n",
 199                                part_num, dev_desc->devnum);
 200                 return (-1);
 201         }
 202         switch(pide->boot_media) {
 203                 case 0x00: /* no emulation */
 204                         info->size = get_unaligned_le16(pide->sec_cnt)>>2;
 205                         break;
 206                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 207                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 208                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 209                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 210                 default:        info->size=0; break;
 211         }
 212         newblkaddr = get_unaligned_le32(pide->rel_block_addr);
 213         info->start=newblkaddr;
 214
 215         if (dev_desc->blksz == 512) {
 216                 info->size *= 4;
 217                 info->start *= 4;
 218                 info->blksz = 512;
 219         }
 220
 221         PRINTF(" part %d found @ %lx size %lx\n",part_num,info->start,info->size);
 222         return 0;
 223 }
 224
 225 static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
 226                                   disk_partition_t *info)
 227 {
 228         return part_get_info_iso_verb(dev_desc, part_num, info, 1);
 229 }
 230
 231 static void part_print_iso(struct blk_desc *dev_desc)
 232 {
 233         disk_partition_t info;
 234         int i;
 235
 236         if (part_get_info_iso_verb(dev_desc, 0, &info, 0) == -1) {
 237                 printf("** No boot partition found on device %d **\n",
 238                        dev_desc->devnum);
 239                 return;
 240         }
 241         printf("Part   Start     Sect x Size Type\n");
 242         i=0;
 243         do {
 244                 printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 245                        i, info.start, info.size, info.blksz, info.type);
 246                 i++;
 247         } while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
 248 }
 249
 250 static int part_test_iso(struct blk_desc *dev_desc)
 251 {
 252         disk_partition_t info;
 253
 254         return part_get_info_iso_verb(dev_desc, 1, &info, 1);
 255 }
 256
 257 U_BOOT_PART_TYPE(iso) = {
 258         .name           = "ISO",
 259         .part_type      = PART_TYPE_ISO,
 260         .get_info       = part_get_info_iso,
 261         .print          = part_print_iso,
 262         .test           = part_test_iso,
 263 };
 264 #endif