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         part_set_generic_name(dev_desc, part_num, (char *)info->name);
 141         /* the bootcatalog (including validation Entry) is limited to 2048Bytes
 142          * (63 boot entries + validation entry) */
 143          while(offset<2048) {
 144                 pide=(iso_init_def_entry_t *)&tmpbuf[offset];
 145                 if ((pide->boot_ind==0x88) ||
 146                     (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
 147                         if(entry_num==part_num) { /* part found */
 148                                 goto found;
 149                         }
 150                         entry_num++; /* count partitions Entries (boot and non bootables */
 151                         offset+=0x20;
 152                         continue;
 153                 }
 154                 if ((pide->boot_ind==0x90) ||   /* Section Header Entry */
 155                     (pide->boot_ind==0x91) ||   /* Section Header Entry (last) */
 156                     (pide->boot_ind==0x44)) {   /* Extension Indicator */
 157                         offset+=0x20; /* skip unused entries */
 158                 }
 159                 else {
 160                         if(verb)
 161                                 printf ("** Partition %d not found on device %d **\n",
 162                                         part_num, dev_desc->devnum);
 163                         return(-1);
 164                 }
 165         }
 166         /* if we reach this point entire sector has been
 167          * searched w/o succsess */
 168         if(verb)
 169                 printf ("** Partition %d not found on device %d **\n",
 170                         part_num, dev_desc->devnum);
 171         return(-1);
 172 found:
 173         if(pide->boot_ind!=0x88) {
 174                 if(verb)
 175                         printf("** Partition %d is not bootable on device %d **\n",
 176                                part_num, dev_desc->devnum);
 177                 return (-1);
 178         }
 179         switch(pide->boot_media) {
 180                 case 0x00: /* no emulation */
 181                         info->size = get_unaligned_le16(pide->sec_cnt)>>2;
 182                         break;
 183                 case 0x01:      info->size=2400>>2; break; /* 1.2MByte Floppy */
 184                 case 0x02:      info->size=2880>>2; break; /* 1.44MByte Floppy */
 185                 case 0x03:      info->size=5760>>2; break; /* 2.88MByte Floppy */
 186                 case 0x04:      info->size=2880>>2; break; /* dummy (HD Emulation) */
 187                 default:        info->size=0; break;
 188         }
 189         newblkaddr = get_unaligned_le32(pide->rel_block_addr);
 190         info->start=newblkaddr;
 191
 192         if (dev_desc->blksz == 512) {
 193                 info->size *= 4;
 194                 info->start *= 4;
 195                 info->blksz = 512;
 196         }
 197
 198         PRINTF(" part %d found @ %lx size %lx\n",part_num,info->start,info->size);
 199         return 0;
 200 }
 201
 202 static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
 203                                   disk_partition_t *info)
 204 {
 205         return part_get_info_iso_verb(dev_desc, part_num, info, 1);
 206 }
 207
 208 static void part_print_iso(struct blk_desc *dev_desc)
 209 {
 210         disk_partition_t info;
 211         int i;
 212
 213         if (part_get_info_iso_verb(dev_desc, 1, &info, 0) == -1) {
 214                 printf("** No boot partition found on device %d **\n",
 215                        dev_desc->devnum);
 216                 return;
 217         }
 218         printf("Part   Start     Sect x Size Type\n");
 219         i=1;
 220         do {
 221                 printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 222                        i, info.start, info.size, info.blksz, info.type);
 223                 i++;
 224         } while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
 225 }
 226
 227 static int part_test_iso(struct blk_desc *dev_desc)
 228 {
 229         disk_partition_t info;
 230
 231         return part_get_info_iso_verb(dev_desc, 1, &info, 1);
 232 }
 233
 234 U_BOOT_PART_TYPE(iso) = {
 235         .name           = "ISO",
 236         .part_type      = PART_TYPE_ISO,
 237         .max_entries    = ISO_ENTRY_NUMBERS,
 238         .get_info       = part_get_info_iso,
 239         .print          = part_print_iso,
 240         .test           = part_test_iso,
 241 };
 242 #endif