/*
   * (C) Copyright 2001
   * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <command.h>
  #include "part_iso.h"
  
  #ifdef HAVE_BLOCK_DEVICE
  
  /* #define	ISO_PART_DEBUG */
  
  #ifdef	ISO_PART_DEBUG
  #define	PRINTF(fmt,args...)	printf (fmt ,##args)
  #else
  #define PRINTF(fmt,args...)
  #endif
  
  /* enable this if CDs are written with the PowerPC Platform ID */
  #undef CHECK_FOR_POWERPC_PLATTFORM
  #define CD_SECTSIZE 2048
  
  static unsigned char tmpbuf[CD_SECTSIZE];
  
  /* Convert char[4] in little endian format to the host format integer
   */
  static inline unsigned long le32_to_int(unsigned char *le32)
  {
      return ((le32[3] << 24) +
  	    (le32[2] << 16) +
  	    (le32[1] << 8) +
  	     le32[0]
  	   );
  }
  /* Convert char[2] in little endian format to the host format integer
   */
  static inline unsigned short le16_to_int(unsigned char *le16)
  {
      return ((le16[1] << 8) +
  	   le16[0]
  	   );
  }
  
  
  /* only boot records will be listed as valid partitions */
  int get_partition_info_iso_verb(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info, int verb)
  {
  	int i,offset,entry_num;
  	unsigned short *chksumbuf;
  	unsigned short chksum;
  	unsigned long newblkaddr,blkaddr,lastsect,bootaddr;
  	iso_boot_rec_t *pbr = (iso_boot_rec_t	*)tmpbuf; /* boot record */
  	iso_pri_rec_t *ppr = (iso_pri_rec_t	*)tmpbuf;	/* primary desc */
  	iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
  	iso_init_def_entry_t *pide;
  
  	if (dev_desc->blksz != CD_SECTSIZE)
  		return -1;
  
  	/* the first sector (sector 0x10) must be a primary volume desc */
  	blkaddr=PVD_OFFSET;
  	if (dev_desc->block_read (dev_desc->dev, PVD_OFFSET, 1, (ulong *) tmpbuf) != 1)
  	return (-1);
  	if(ppr->desctype!=0x01) {
  		if(verb)
  			printf ("** First descriptor is NOT a primary desc on %d:%d **
  ",
  				dev_desc->dev, part_num);
  		return (-1);
  	}
  	if(strncmp((char *)ppr->stand_ident,"CD001",5)!=0) {
  		if(verb)
  			printf ("** Wrong ISO Ident: %s on %d:%d **
  ",
  				ppr->stand_ident,dev_desc->dev, part_num);
  		return (-1);
  	}
  	lastsect= ((ppr->firstsek_LEpathtab1_LE & 0x000000ff)<<24) +
  		  ((ppr->firstsek_LEpathtab1_LE & 0x0000ff00)<< 8) +
  		  ((ppr->firstsek_LEpathtab1_LE & 0x00ff0000)>> 8) +
  		  ((ppr->firstsek_LEpathtab1_LE & 0xff000000)>>24) ;
  	info->blksz=ppr->secsize_BE; /* assuming same block size for all entries */
  	PRINTF(" Lastsect:%08lx
  ",lastsect);
  	for(i=blkaddr;i<lastsect;i++) {
  		PRINTF("Reading block %d
  ", i);
  		if (dev_desc->block_read (dev_desc->dev, i, 1, (ulong *) tmpbuf) != 1)
  		return (-1);
  		if(ppr->desctype==0x00)
  			break; /* boot entry found */
  		if(ppr->desctype==0xff) {
  			if(verb)
  				printf ("** No valid boot catalog found on %d:%d **
  ",
  					dev_desc->dev, part_num);
  			return (-1);
  		}
  	}
  	/* boot entry found */
  	if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {
  		if(verb)
  			printf ("** Wrong El Torito ident: %s on %d:%d **
  ",
  				pbr->ident_str,dev_desc->dev, part_num);
  		return (-1);
  	}
  	bootaddr=le32_to_int(pbr->pointer);
  	PRINTF(" Boot Entry at: %08lX
  ",bootaddr);
  	if (dev_desc->block_read (dev_desc->dev, bootaddr, 1, (ulong *) tmpbuf) != 1) {
  		if(verb)
  			printf ("** Can't read Boot Entry at %lX on %d:%d **
  ",
  				bootaddr,dev_desc->dev, part_num);
  		return (-1);
  	}
  	chksum=0;
  	chksumbuf = (unsigned short *)tmpbuf;
  	for(i=0;i<0x10;i++)
  		chksum+=((chksumbuf[i] &0xff)<<8)+((chksumbuf[i] &0xff00)>>8);
  	if(chksum!=0) {
  		if(verb)
  			printf ("** Checksum Error in booting catalog validation entry on %d:%d **
  ",
  				dev_desc->dev, part_num);
  		return (-1);
  	}
  	if((pve->key[0]!=0x55)||(pve->key[1]!=0xAA)) {
  		if(verb)
  			printf ("** Key 0x55 0xAA error on %d:%d **
  ",
  				dev_desc->dev, part_num);
  		return(-1);
  	}
  #ifdef CHECK_FOR_POWERPC_PLATTFORM
  	if(pve->platform!=0x01) {
  		if(verb)
  			printf ("** No PowerPC platform CD on %d:%d **
  ",
  				dev_desc->dev, part_num);
  		return(-1);
  	}
  #endif
  	/* the validation entry seems to be ok, now search the "partition" */
  	entry_num=0;
  	offset=0x20;
  	sprintf ((char *)info->type, "U-Boot");
  	switch(dev_desc->if_type) {
  		case IF_TYPE_IDE:
  		case IF_TYPE_SATA:
  		case IF_TYPE_ATAPI:
  			sprintf ((char *)info->name, "hd%c%d",
  				'a' + dev_desc->dev, part_num);
  			break;
  		case IF_TYPE_SCSI:
  			sprintf ((char *)info->name, "sd%c%d",
  				'a' + dev_desc->dev, part_num);
  			break;
  		case IF_TYPE_USB:
  			sprintf ((char *)info->name, "usbd%c%d",
  				'a' + dev_desc->dev, part_num);
  			break;
  		case IF_TYPE_DOC:
  			sprintf ((char *)info->name, "docd%c%d",
  				'a' + dev_desc->dev, part_num);
  			break;
  		default:
  			sprintf ((char *)info->name, "xx%c%d",
  				'a' + dev_desc->dev, part_num);
  			break;
  	}
  	/* the bootcatalog (including validation Entry) is limited to 2048Bytes
  	 * (63 boot entries + validation entry) */
  	 while(offset<2048) {
  		pide=(iso_init_def_entry_t *)&tmpbuf[offset];
  		if ((pide->boot_ind==0x88) ||
  		    (pide->boot_ind==0x00)) { /* Header Id for default Sections Entries */
  			if(entry_num==part_num) { /* part found */
  				goto found;
  			}
  			entry_num++; /* count partitions Entries (boot and non bootables */
  			offset+=0x20;
  			continue;
  		}
  		if ((pide->boot_ind==0x90) ||	/* Section Header Entry */
  		    (pide->boot_ind==0x91) ||	/* Section Header Entry (last) */
  		    (pide->boot_ind==0x44)) {	/* Extension Indicator */
  			offset+=0x20; /* skip unused entries */
  		}
  		else {
  			if(verb)
  				printf ("** Partition %d not found on device %d **
  ",
  					part_num,dev_desc->dev);
  			return(-1);
  		}
  	}
  	/* if we reach this point entire sector has been
  	 * searched w/o succsess */
  	if(verb)
  		printf ("** Partition %d not found on device %d **
  ",
  			part_num,dev_desc->dev);
  	return(-1);
  found:
  	if(pide->boot_ind!=0x88) {
  		if(verb)
  			printf ("** Partition %d is not bootable on device %d **
  ",
  				part_num,dev_desc->dev);
  		return (-1);
  	}
  	switch(pide->boot_media) {
  		case 0x00: /* no emulation */
  			info->size=le16_to_int(pide->sec_cnt)>>2;
  			break;
  		case 0x01:	info->size=2400>>2; break; /* 1.2MByte Floppy */
  		case 0x02:	info->size=2880>>2; break; /* 1.44MByte Floppy */
  		case 0x03:	info->size=5760>>2; break; /* 2.88MByte Floppy */
  		case 0x04:	info->size=2880>>2; break; /* dummy (HD Emulation) */
  		default:	info->size=0; break;
  	}
  	newblkaddr=le32_to_int(pide->rel_block_addr);
  	info->start=newblkaddr;
  	PRINTF(" part %d found @ %lx size %lx
  ",part_num,newblkaddr,info->size);
  	return 0;
  }
  
  int get_partition_info_iso(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info)
  {
  	return(get_partition_info_iso_verb(dev_desc, part_num, info, 1));
  }
  
  
  void print_part_iso(block_dev_desc_t * dev_desc)
  {
  	disk_partition_t info;
  	int i;
  	if(get_partition_info_iso_verb(dev_desc,0,&info,0)==-1) {
  		printf("** No boot partition found on device %d **
  ",dev_desc->dev);
  		return;
  	}
  	printf("Part   Start     Sect x Size Type
  ");
  	i=0;
  	do {
  		printf(" %2d " LBAFU " " LBAFU " %6ld %.32s
  ",
  		       i, info.start, info.size, info.blksz, info.type);
  		i++;
  	} while (get_partition_info_iso_verb(dev_desc,i,&info,0)!=-1);
  }
  
  int test_part_iso (block_dev_desc_t *dev_desc)
  {
  	disk_partition_t info;
  
  	return(get_partition_info_iso_verb(dev_desc,0,&info,0));
  }
  
  #endif