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/*
* <isofs.c>
*
* Open Hack'Ware BIOS ISOFS partition type management
*
* Copyright (c) 2004-2005 Jocelyn Mayer
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License V2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include "bios.h"
#include "libpart.h"
/* ISO FS partitions handlers */
#define ISOFS_BLOCSIZE (2048)
/* Generic ISO fs descriptor */
typedef struct isofs_desc_t isofs_desc_t;
struct isofs_desc_t {
uint8_t type;
uint8_t ID[5];
uint8_t version;
uint8_t data[2041];
} __attribute__ ((packed));
typedef struct iso_primary_desc_t iso_primary_desc_t;
struct iso_primary_desc_t {
uint8_t type;
uint8_t ID[5];
uint8_t version;
uint8_t pad0;
uint8_t system_id[32];
uint8_t volume_id[32];
uint8_t pad1[8];
uint32_t volume_size;
} __attribute__ ((packed));
/* The only descriptor we're interrested in here
* is El-torito boot descriptor
*/
typedef struct isofs_bootdesc_t isofs_bootdesc_t;
struct isofs_bootdesc_t {
uint8_t type;
uint8_t ID[5];
uint8_t version;
uint8_t sys_ID[32];
uint8_t pad[32];
uint32_t catalog;
uint8_t data[1973];
} __attribute__ ((packed));
#define ISO_BOOTABLE 0x88
enum {
ISOBOOT_IX86 = 0,
ISOBOOT_PPC = 1,
ISOBOOT_MAC = 2,
};
enum {
ISOMEDIA_NOEMUL = 0,
ISOMEDIA_FL12 = 1,
ISOMEDIA_FL144 = 2,
ISOMEDIA_FL288 = 3,
ISOMEDIA_HD = 4,
};
typedef struct isofs_validdesc_t isofs_validdesc_t;
struct isofs_validdesc_t {
uint8_t ID;
uint8_t arch;
uint8_t pad[2];
uint8_t name[24];
uint8_t csum[2];
uint16_t key;
} __attribute__ ((packed));
typedef struct isofs_bootcat_t isofs_bootcat_t;
struct isofs_bootcat_t {
uint8_t bootable;
uint8_t media;
uint8_t segment[2];
uint8_t sys_type;
uint8_t pad;
uint16_t nsect;
uint32_t offset;
uint8_t data[20];
} __attribute__ ((packed));
part_t *isofs_probe_partitions (bloc_device_t *bd)
{
unsigned char name[32];
void *buffer;
union {
isofs_desc_t desc;
isofs_bootdesc_t bootdesc;
iso_primary_desc_t primdesc;
} *desc;
isofs_validdesc_t *valid;
isofs_bootcat_t *bootcat;
part_t *part;
uint32_t boot_desc;
uint32_t nsect, bloc, offset, length;
int i, end_reached;
part = NULL;
buffer = malloc(ISOFS_BLOCSIZE);
end_reached = 0;
desc = buffer;
boot_desc = -1;
/* The descriptors start at offset 0x8000 */
for (bloc = 0x8000 / ISOFS_BLOCSIZE; end_reached == 0; bloc++) {
bd_seek(bd, bloc, 0);
if (bd_read(bd, buffer, ISOFS_BLOCSIZE) < 0) {
ERROR("%s bloc_read %d failed\n", __func__, bloc);
goto error;
}
if (strncmp("CD001", desc->desc.ID, 5) != 0) {
// MSG("\rNo ISO9660 signature\n");
goto error;
}
/* We found at least one valid descriptor */
switch (desc->desc.type) {
case 0x00:
/* El-torito descriptor, great ! */
DPRINTF("El-torito descriptor: %08x %d\n", desc->bootdesc.catalog,
(char *)&desc->bootdesc.catalog - (char *)desc);
boot_desc = get_le32(&desc->bootdesc.catalog);
break;
case 0x01:
/* ISOFS primary descriptor */
DPRINTF("ISOFS primary descriptor (%d %d)\n",
get_le32(&desc->primdesc.volume_size) * 2048,
get_le32(&desc->primdesc.volume_size));
break;
case 0x02:
/* ISOFS suplementary descriptor */
DPRINTF("ISOFS suplementary descriptor\n");
break;
case 0xFF:
/* End of descriptor list */
DPRINTF("End of descriptor list\n");
end_reached = 1;
break;
}
}
if (boot_desc != (uint32_t)(-1)) {
/* Find the validation descriptor */
bd_seek(bd, boot_desc, 0);
for (i = 0; i < (ISOFS_BLOCSIZE / 64); i++) {
DPRINTF("ISO catalog...\n");
bd_read(bd, buffer, 64);
valid = buffer;
#if 1
if (valid->ID != 0x01 || get_le16(&valid->key) != 0xAA55) {
ERROR("ISO catalog with invalid ID/key: %x %x\n",
valid->ID, valid->key);
continue;
}
#endif
#if 0
#if defined (__i386__)
if (valid->arch != ISOBOOT_IX86) {
ERROR("ISO catalog not for x86: %d\n", valid->arch);
continue;
}
#elif defined (__powerpc__)
if (valid->arch != ISOBOOT_PPC && valid->arch != ISOBOOT_MAC) {
ERROR("ISO catalog not for PPC: %d\n", valid->arch);
continue;
}
#else
ERROR("Unknown host architecture !\n");
continue;
#endif
#endif
bootcat = (void *)(valid + 1);
if (bootcat->bootable != ISO_BOOTABLE) {
ERROR("Non bootable ISO catalog\n");
continue;
}
nsect = get_le16(&bootcat->nsect);
switch (bootcat->media) {
case ISOMEDIA_NOEMUL:
length = nsect * ISOFS_BLOCSIZE;
dprintf("No emulation\n");
break;
case ISOMEDIA_FL12:
length = 1200 * 1024;
dprintf("1.2 MB floppy\n");
break;
case ISOMEDIA_FL144:
length = 1440 * 1024;
dprintf("1.44 MB floppy\n");
break;
case ISOMEDIA_FL288:
length = 2880 * 1024;
dprintf("2.88 MB floppy\n");
break;
case ISOMEDIA_HD:
length = nsect * ISOFS_BLOCSIZE;
dprintf("HD image\n");
break;
default:
ERROR("Unknown media type: %d\n", bootcat->media);
continue;
}
offset = get_le32(&bootcat->offset);
/* Register boot disc */
part = malloc(sizeof(part_t));
part->bd = bd;
part_set_blocsize(bd, part, ISOFS_BLOCSIZE);
part->start = offset;
part->size = (length + ISOFS_BLOCSIZE - 1) / ISOFS_BLOCSIZE;
part->boot_start.bloc = 0;
part->boot_start.offset = 0;
part->boot_size.bloc = length / ISOFS_BLOCSIZE;
part->boot_size.offset = length % ISOFS_BLOCSIZE;
part->boot_load = 0;
part->boot_entry = 0;
if (valid->name[0] == '\0') {
strcpy(name, "ISOFS");
} else {
memcpy(name, valid->name, sizeof(valid->name));
name[sizeof(valid->name)] = '\0';
}
printf("Partition '%s': %p st %0x size %0x %d\n",
name, part, offset, length, bootcat->media);
printf(" boot %0x %0x load %0x entry %0x\n",
part->boot_start.bloc, part->boot_size.bloc,
part->boot_load, part->boot_entry);
part->flags = PART_TYPE_ISO9660 | PART_FLAG_BOOT;
part_register(bd, part, name, i + 1);
fs_raw_set_bootfile(part, part->boot_start.bloc,
part->boot_start.offset,
part->boot_size.bloc,
part->boot_size.offset);
break;
}
}
error:
free(buffer);
return part;
}
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