memdisk/eltorito.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2009-2010 Shao Miller - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8  *   Boston MA 02111-1307, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * eltorito.h
  15  *
  16  * EDD-4 El Torito structures and debugging routines
  17  */
  18
  19 #include <stdint.h>
  20 #include "compiler.h"
  21
  22 /* EDD-4 Bootable Optical Disc Drive Boot Volume Descriptor */
  23 MEMDISK_PACKED_PREFIX
  24 struct edd4_bvd {
  25     uint8_t boot_rec_ind;       /* Boot Record Indicator */
  26     uint8_t iso9660_id[5];      /* ISO9660 ID            */
  27     uint8_t ver;                /* Descriptor Version    */
  28     uint8_t eltorito[32];       /* "EL TORITO" etc.      */
  29     uint8_t res1[32];           /* Reserved              */
  30     uint32_t boot_cat;          /* Boot catalog sector   */
  31     uint8_t res2[1973];         /* Reserved              */
  32 } MEMDISK_PACKED_POSTFIX;
  33
  34 MEMDISK_PACKED_PREFIX
  35 struct validation_entry {
  36     uint8_t header_id;          /* Header ID                      */
  37     uint8_t platform_id;        /* Platform ID                    */
  38     uint16_t res1;              /* Reserved                       */
  39     uint8_t id_string[24];      /* Manufacturer                   */
  40     uint16_t checksum;          /* Sums with whole record to zero */
  41     uint8_t key55;              /* Key byte 0x55                  */
  42     uint8_t keyAA;              /* Key byte 0xAA                  */
  43 } MEMDISK_PACKED_POSTFIX;
  44
  45 MEMDISK_PACKED_PREFIX
  46 struct initial_entry {
  47     uint8_t header_id;          /* Header ID                */
  48     uint8_t media_type;         /* Media type               */
  49     uint16_t load_seg;          /* Load segment             */
  50     uint8_t system_type;        /* (Filesystem ID)          */
  51     uint8_t res1;               /* Reserved                 */
  52     uint16_t sect_count;        /* Emulated sectors to load */
  53     uint32_t load_block;        /* Starting sector of image */
  54     uint8_t res2[4];            /* Reserved                 */
  55 } MEMDISK_PACKED_POSTFIX;
  56
  57 /* EDD-4 Bootable Optical Disc Drive Boot Catalog (fixed-size portions) */
  58 MEMDISK_PACKED_PREFIX
  59 struct edd4_bootcat {
  60     struct validation_entry validation_entry;
  61     struct initial_entry initial_entry;
  62 } MEMDISK_PACKED_POSTFIX;
  63
  64 /* EDD-4 CD Specification Packet */
  65 MEMDISK_PACKED_PREFIX
  66 struct edd4_cd_pkt {
  67     uint8_t size;               /* Packet size                     */
  68     uint8_t type;               /* Boot media type (flags)         */
  69     uint8_t driveno;            /* INT 13h drive number            */
  70     uint8_t controller;         /* Controller index                */
  71     uint32_t start;             /* Starting LBA of image           */
  72     uint16_t devno;             /* Device number                   */
  73     uint16_t userbuf;           /* User buffer segment             */
  74     uint16_t load_seg;          /* Load segment                    */
  75     uint16_t sect_count;        /* Emulated sectors to load        */
  76     uint8_t geom1;              /* Cylinders bits 0 thru 7         */
  77     uint8_t geom2;              /* Sects/track 0 thru 5, cyls 8, 9 */
  78     uint8_t geom3;              /* Heads                           */
  79 } MEMDISK_PACKED_POSTFIX;
  80