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/*
* Copyright (c) 2007 Vreixo Formoso
* Copyright (c) 2010 - 2014 Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* or later as published by the Free Software Foundation.
* See COPYING file for details.
*/
/**
* Declare El-Torito related structures.
* References:
* "El Torito" Bootable CD-ROM Format Specification Version 1.0 (1995)
*/
#ifndef LIBISO_ELTORITO_H
#define LIBISO_ELTORITO_H
#include "ecma119.h"
#include "node.h"
/**
* A node that acts as a placeholder for an El-Torito catalog.
*/
struct Iso_Boot
{
IsoNode node;
/* Want to get content of loaded boot catalog.
Vreixo took care not to make it an IsoFile at load time.
So this is implemented independently of IsoStream.
*/
uint32_t lba;
off_t size;
char *content;
};
/* Not more than 32 so that all entries fit into 2048 bytes */
#define Libisofs_max_boot_imageS 32
struct el_torito_boot_catalog {
IsoBoot *node; /* node of the catalog */
int num_bootimages;
struct el_torito_boot_image *bootimages[Libisofs_max_boot_imageS];
/* [0]= default boot image */
/* Weight value for image sorting */
int sort_weight;
};
struct el_torito_boot_image {
IsoFile *image;
/* Overrides .image if >= 0 : array index of appended partition */
int appended_idx;
uint32_t appended_start; /* In blocks of 2048 bytes */
uint32_t appended_size; /* In blocks of 512 bytes */
unsigned int bootable:1; /**< If the entry is bootable. */
/**
* Whether the boot image seems to contain a boot_info_table
*/
unsigned int seems_boot_info_table:1;
unsigned int seems_grub2_boot_info:1;
/**
* Whether the boot image seems to be capable of isohybrid
*/
unsigned int seems_isohybrid_capable:1;
/**
* isolinux options
* bit 0 -> whether to patch image
* bit 1 -> whether to put built-in isolinux 3.72 isohybrid-MBR into image
* System Area (deprecated)
*
* bit2-7= Mentioning in isohybrid GPT
* 0= do not mention in GPT
* 1= mention as EFI partition
* 2= Mention as HFS+ partition
* bit8= Mention in isohybrid Apple partition map
*/
unsigned int isolinux_options;
unsigned char type; /**< The type of image */
unsigned char partition_type; /**< type of partition for HD-emul images */
uint16_t load_seg; /**< Load segment for the initial boot image. */
uint16_t load_size; /**< Number of sectors to load. */
int load_size_full; /* 1= override load_size by image size */
/* Byte 1 of Validation Entry or Section Header Entry:
0= 80x86, 1= PowerPC, 2= Mac, 0xef= EFI */
uint8_t platform_id;
uint8_t id_string[28];
uint8_t selection_crit[20];
};
/** El-Torito, 2.1 */
struct el_torito_validation_entry {
uint8_t header_id BP(1, 1);
uint8_t platform_id BP(2, 2);
uint8_t reserved BP(3, 4);
uint8_t id_string BP(5, 28);
uint8_t checksum BP(29, 30);
uint8_t key_byte1 BP(31, 31);
uint8_t key_byte2 BP(32, 32);
};
/** El-Torito, 2.2 */
struct el_torito_default_entry {
uint8_t boot_indicator BP(1, 1);
uint8_t boot_media_type BP(2, 2);
uint8_t load_seg BP(3, 4);
uint8_t system_type BP(5, 5);
uint8_t unused1 BP(6, 6);
uint8_t sec_count BP(7, 8);
uint8_t block BP(9, 12);
uint8_t unused2 BP(13, 32);
};
/** El-Torito, 2.3 */
struct el_torito_section_header {
uint8_t header_indicator BP(1, 1);
uint8_t platform_id BP(2, 2);
uint8_t num_entries BP(3, 4);
uint8_t id_string BP(5, 32);
};
/** El-Torito, 2.4 */
struct el_torito_section_entry {
uint8_t boot_indicator BP(1, 1);
uint8_t boot_media_type BP(2, 2);
uint8_t load_seg BP(3, 4);
uint8_t system_type BP(5, 5);
uint8_t unused1 BP(6, 6);
uint8_t sec_count BP(7, 8);
uint8_t block BP(9, 12);
uint8_t selec_criteria BP(13, 13);
uint8_t vendor_sc BP(14, 32);
};
void el_torito_boot_catalog_free(struct el_torito_boot_catalog *cat);
/**
* Create a IsoFileSrc for writing the el-torito catalog for the given
* target, and add it to target. If the target already has a src for the
* catalog, it just returns.
*/
int el_torito_catalog_file_src_create(Ecma119Image *target, IsoFileSrc **src);
/**
* Create a writer for el-torito information.
*/
int eltorito_writer_create(Ecma119Image *target);
/**
* Insert boot info table content into buf.
*
* @return
* 1 on success, 0 error (but continue), < 0 error
*/
int make_boot_info_table(uint8_t *buf, uint32_t pvd_lba,
uint32_t boot_lba, uint32_t imgsize);
/* Patch the boot images if indicated.
*/
int iso_patch_eltoritos(Ecma119Image *t);
/* Parameters for patch_grub2_boot_image()
Might later become variables in struct el_torito_boot_image.
*/
#define Libisofs_grub2_elto_patch_poS (512 * 5 - 12)
#define Libisofs_grub2_elto_patch_offsT 5
/* Maximum size of a boot image which is marked by
el_torito_set_isolinux_options() for patching (boot info table,
GRUB2 boot info, maybe others).
*/
#define Libisofs_elto_max_patchablE (32 * 1024 * 1024)
#endif /* LIBISO_ELTORITO_H */