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![Alexander Graf](/assets/img/avatar_default.png)
Real CD-ROMs are pretty obsolete these days. Usually people still keep iso files around, but just put them on USB sticks or SD cards and expect them to "just work". To support this use case with El Torito images, add support for 512 byte sector size to the iso parsing code. Signed-off-by: Alexander Graf <agraf@suse.de>
265 lines
7.1 KiB
C
265 lines
7.1 KiB
C
/*
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* (C) Copyright 2001
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* Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/unaligned.h>
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#include "part_iso.h"
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#ifdef HAVE_BLOCK_DEVICE
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/* #define ISO_PART_DEBUG */
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#ifdef ISO_PART_DEBUG
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#define PRINTF(fmt,args...) printf (fmt ,##args)
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#else
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#define PRINTF(fmt,args...)
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#endif
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/* enable this if CDs are written with the PowerPC Platform ID */
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#undef CHECK_FOR_POWERPC_PLATTFORM
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#define CD_SECTSIZE 2048
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static unsigned char tmpbuf[CD_SECTSIZE];
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unsigned long iso_dread(struct blk_desc *block_dev, lbaint_t start,
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lbaint_t blkcnt, void *buffer)
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{
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unsigned long ret;
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if (block_dev->blksz == 512) {
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/* Convert from 2048 to 512 sector size */
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start *= 4;
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blkcnt *= 4;
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}
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ret = blk_dread(block_dev, start, blkcnt, buffer);
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if (block_dev->blksz == 512)
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ret /= 4;
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return ret;
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}
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/* only boot records will be listed as valid partitions */
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int part_get_info_iso_verb(struct blk_desc *dev_desc, int part_num,
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disk_partition_t *info, int verb)
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{
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int i,offset,entry_num;
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unsigned short *chksumbuf;
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unsigned short chksum;
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unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
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iso_boot_rec_t *pbr = (iso_boot_rec_t *)tmpbuf; /* boot record */
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iso_pri_rec_t *ppr = (iso_pri_rec_t *)tmpbuf; /* primary desc */
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iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
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iso_init_def_entry_t *pide;
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if ((dev_desc->blksz != CD_SECTSIZE) && (dev_desc->blksz != 512))
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return -1;
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/* the first sector (sector 0x10) must be a primary volume desc */
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blkaddr=PVD_OFFSET;
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if (iso_dread(dev_desc, PVD_OFFSET, 1, (ulong *)tmpbuf) != 1)
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return -1;
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if(ppr->desctype!=0x01) {
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if(verb)
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printf ("** First descriptor is NOT a primary desc on %d:%d **\n",
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dev_desc->devnum, part_num);
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return (-1);
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}
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if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
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if(verb)
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printf ("** Wrong ISO Ident: %s on %d:%d **\n",
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ppr->stand_ident, dev_desc->devnum, part_num);
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return (-1);
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}
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lastsect = le32_to_cpu(ppr->firstsek_LEpathtab1_LE);
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/* assuming same block size for all entries */
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info->blksz = be16_to_cpu(ppr->secsize_BE);
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PRINTF(" Lastsect:%08lx\n",lastsect);
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for(i=blkaddr;i<lastsect;i++) {
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PRINTF("Reading block %d\n", i);
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if (iso_dread(dev_desc, i, 1, (ulong *)tmpbuf) != 1)
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return -1;
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if(ppr->desctype==0x00)
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break; /* boot entry found */
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if(ppr->desctype==0xff) {
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if(verb)
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printf ("** No valid boot catalog found on %d:%d **\n",
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dev_desc->devnum, part_num);
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return (-1);
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}
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}
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/* boot entry found */
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if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
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if(verb)
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printf ("** Wrong El Torito ident: %s on %d:%d **\n",
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pbr->ident_str, dev_desc->devnum, part_num);
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return (-1);
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}
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bootaddr = get_unaligned_le32(pbr->pointer);
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PRINTF(" Boot Entry at: %08lX\n",bootaddr);
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if (iso_dread(dev_desc, bootaddr, 1, (ulong *)tmpbuf) != 1) {
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if(verb)
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printf ("** Can't read Boot Entry at %lX on %d:%d **\n",
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bootaddr, dev_desc->devnum, part_num);
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return (-1);
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}
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chksum=0;
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chksumbuf = (unsigned short *)tmpbuf;
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for(i=0;i<0x10;i++)
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chksum += le16_to_cpu(chksumbuf[i]);
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if(chksum!=0) {
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if(verb)
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printf("** Checksum Error in booting catalog validation entry on %d:%d **\n",
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dev_desc->devnum, part_num);
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return (-1);
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}
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if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
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if(verb)
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printf ("** Key 0x55 0xAA error on %d:%d **\n",
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dev_desc->devnum, part_num);
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return(-1);
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}
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#ifdef CHECK_FOR_POWERPC_PLATTFORM
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if(pve->platform!=0x01) {
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if(verb)
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printf ("** No PowerPC platform CD on %d:%d **\n",
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dev_desc->devnum, part_num);
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return(-1);
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}
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#endif
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/* the validation entry seems to be ok, now search the "partition" */
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entry_num=1;
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offset=0x20;
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strcpy((char *)info->type, "U-Boot");
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switch(dev_desc->if_type) {
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case IF_TYPE_IDE:
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case IF_TYPE_SATA:
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case IF_TYPE_ATAPI:
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sprintf ((char *)info->name, "hd%c%d",
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'a' + dev_desc->devnum, part_num);
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break;
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case IF_TYPE_SCSI:
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sprintf ((char *)info->name, "sd%c%d",
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'a' + dev_desc->devnum, part_num);
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break;
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case IF_TYPE_USB:
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sprintf ((char *)info->name, "usbd%c%d",
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'a' + dev_desc->devnum, part_num);
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break;
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case IF_TYPE_DOC:
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sprintf ((char *)info->name, "docd%c%d",
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'a' + dev_desc->devnum, part_num);
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break;
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default:
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sprintf ((char *)info->name, "xx%c%d",
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'a' + dev_desc->devnum, part_num);
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break;
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}
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/* the bootcatalog (including validation Entry) is limited to 2048Bytes
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* (63 boot entries + validation entry) */
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while(offset<2048) {
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pide=(iso_init_def_entry_t *)&tmpbuf[offset];
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if ((pide->boot_ind==0x88) ||
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(pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
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if(entry_num==part_num) { /* part found */
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goto found;
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}
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entry_num++; /* count partitions Entries (boot and non bootables */
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offset+=0x20;
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continue;
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}
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if ((pide->boot_ind==0x90) || /* Section Header Entry */
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(pide->boot_ind==0x91) || /* Section Header Entry (last) */
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(pide->boot_ind==0x44)) { /* Extension Indicator */
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offset+=0x20; /* skip unused entries */
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}
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else {
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if(verb)
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printf ("** Partition %d not found on device %d **\n",
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part_num, dev_desc->devnum);
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return(-1);
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}
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}
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/* if we reach this point entire sector has been
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* searched w/o succsess */
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if(verb)
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printf ("** Partition %d not found on device %d **\n",
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part_num, dev_desc->devnum);
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return(-1);
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found:
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if(pide->boot_ind!=0x88) {
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if(verb)
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printf("** Partition %d is not bootable on device %d **\n",
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part_num, dev_desc->devnum);
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return (-1);
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}
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switch(pide->boot_media) {
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case 0x00: /* no emulation */
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info->size = get_unaligned_le16(pide->sec_cnt)>>2;
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break;
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case 0x01: info->size=2400>>2; break; /* 1.2MByte Floppy */
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case 0x02: info->size=2880>>2; break; /* 1.44MByte Floppy */
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case 0x03: info->size=5760>>2; break; /* 2.88MByte Floppy */
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case 0x04: info->size=2880>>2; break; /* dummy (HD Emulation) */
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default: info->size=0; break;
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}
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newblkaddr = get_unaligned_le32(pide->rel_block_addr);
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info->start=newblkaddr;
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if (dev_desc->blksz == 512) {
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info->size *= 4;
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info->start *= 4;
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info->blksz = 512;
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}
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PRINTF(" part %d found @ %lx size %lx\n",part_num,info->start,info->size);
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return 0;
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}
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static int part_get_info_iso(struct blk_desc *dev_desc, int part_num,
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disk_partition_t *info)
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{
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return part_get_info_iso_verb(dev_desc, part_num, info, 1);
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}
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static void part_print_iso(struct blk_desc *dev_desc)
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{
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disk_partition_t info;
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int i;
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if (part_get_info_iso_verb(dev_desc, 0, &info, 0) == -1) {
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printf("** No boot partition found on device %d **\n",
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dev_desc->devnum);
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return;
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}
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printf("Part Start Sect x Size Type\n");
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i=0;
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do {
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printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
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i, info.start, info.size, info.blksz, info.type);
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i++;
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} while (part_get_info_iso_verb(dev_desc, i, &info, 0) != -1);
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}
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static int part_test_iso(struct blk_desc *dev_desc)
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{
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disk_partition_t info;
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return part_get_info_iso_verb(dev_desc, 1, &info, 1);
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}
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U_BOOT_PART_TYPE(iso) = {
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.name = "ISO",
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.part_type = PART_TYPE_ISO,
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.get_info = part_get_info_iso,
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.print = part_print_iso,
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.test = part_test_iso,
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};
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#endif
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